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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Industrial Electronics Course By Prof. Dr. Mohamed Ibrahim MAHMOUD

1

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY

AL SHOROUK ACADEMY THE HIGHER INSTITUTE OF ENGINEERING DEPARTEMENT OF COMMUNICATIONS, ELECTRONICS AND COMPUTERS

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‫‪Prof. Dr. Mohamed Ibrahim MAHMOUD‬‬

‫‪Industrial Electronics Course‬‬

‫ﺑﺴﻢ اﷲ اﻟﺮﺣﻤﻦ اﻟﺮﺣﻴﻢ‬ ‫“ وﻣﺎ أوﺗﻴﺘﻢ ﻣﻦ اﻟﻌﻠﻢ إﻻ ﻗﻠﻴﻼ ”‬ ‫ﺻﺪق اﷲ اﻟﻌﻈﻴﻢ‬

‫“ وﻻ ﻳﺤﻴﻄﻮن ﺑﺸﺊ ﻣﻦ ﻋﻠﻤﻪ إﻻ ﺑﻤﺎ ﺷﺎء ”‬ ‫ﺻﺪق اﷲ اﻟﻌﻈﻴﻢ‬

‫“ وﻗﻞ رب زدﻧﻰ ﻋﻠﻤ ًﺎ ”‬ ‫ﺻﺪق اﷲ اﻟﻌﻈﻴﻢ‬

‫‪AL SHOROUK ACADEMY‬‬

‫‪2‬‬

‫‪2‬‬

‫‪Mohamed I. MAHMOUD‬‬

‫‪AL SHOROUK ACADEMY‬‬


Prof. Dr. Mohamed Ibrahim MAHMOUD

3

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY

Industrial Electronics Course

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Automation And Control A A C

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC In An Automation PLC Controlling a Motor Starter Feedback

Supply

Isolating switch fuse carrier

On/Off

Contactor

Position return

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Thermal Overload

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Why Using Relay Supply

Supply Control Control Panel Panel

Control Control Panel Panel 33 Ф Ф Cable Cable

S

On/Off On/Off Switch Switch

6

3 Ф Cable

Supply

The circuit has three advantages 1 – Provides safety for the operator 2 – Reduce coast by reducing high power cable length 3 – Reducing power losses Mohamed I. MAHMOUD

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC: Right Alternative to Relay Control Improved installation time eliminate the need for extensive wiring of timers, relays and other components. Improved flexibility enable control system changes simply by reprogramming. Much more compact than relay control panels, yet enables complex, high-level control. Improved reliability

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC History The PLCs were first introduced at 1968/1969 by Dick Morely. The primary reason for designing such a device was eliminating the large cost involved in replacing the complicated relay based machine control systems in General Motors Factories. The first PLC was called a Modular Digital Controller (MODICON). Other companies at the time proposed computer based schemes, one of which was based upon the PDP-8. The MODICON 084 brought the world's first PLC into commercial production. A Microprocessor based PLC was introduced in 1977 by AllanBradley Corporation. It was based on an 8080 microprocessor but used an extra processor to handle bit logic instructions at high speed. 8

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Definition A PLC is user-friendly, microprocessor-based, specialized computer that carries out control schemes of many types and levels of complexity. It can be programmed, controlled and operated by person unskilled in computers

Advantages

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Rugged: noise immune equipment Modular: easy installation/replacement Standard I/O connections & signal levels Simple programming. Compact sizes. Cost competitive Mohamed I. MAHMOUD

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Computer System

Data Processing Computer System

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC a Process Control System Limit switch

Push button

Proximity sensor

Contactor

Solenoid valve

Light

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Industrial Process Control I P C

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Types of Industrial Processes The three types of industrial Processes are: 1. Continuous production 2. Batch production 3. Discrete item production

1. Continuous Processes It takes in raw materials at the input and runs continuously, producing finished materials at the output. The process may run for long period of time typically: minutes hours or even weeks . (e.g steel sheet Production) Controlled Pressure Thick Steel Block Input

Sheet Steel Output

Slow Speed

High Speed

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Types of Industrial Processes 2. Batch Processes It uses a set quantity of sources material and performs process operations on this material producing a specific quantity of finished product, that will undergo further stages of processing (e.g food & beverage production ). The process may run for long period of time typically: minutes hours or even weeks. Fill

Polymer

Alkali

Fill

P1

P1

Tank 1

Tank 2 Heater

P3

P4

Filter Reaction vessel

P5

Tank 3

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Product silo Tank 4

P6

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Types of Industrial Processes 3. Discrete Processes In this type of process an individual item under goes various operations before being produced in a final form. Alternatively, several components may be combined within the process to emerge as one unit

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Control Strategies Open Loop Control plan

Requirements

Action

Plant system

Outcome

Disturbance

Feedforward Control plan

Requirements

Modification to plan taking into account the disturbance.

Action

Measurements of disturbances

Plant system

Outcome

Disturbance

Closed Loop Measured value

Requirement (set point)

Compare

Feedback Deviation (Error Signal)

Control plan

Action

Plant system

Measured outcome

Disturbance 16

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PID Controller Structure Comparator Error

Set Point Measured Value

Proportional Term Integral Term

Summing Junction

PID Output

Derivative Term

MV

MV=SP

MV=SP SP

Disturbance Causes Changes in MV Time 17

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Three Sections of Control Systems ( T S C S )

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Three Sections of Control Systems

Input Section

Input Section Processing Section

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Inputs Input signals are normally provided by transducers / detectors that convert physical quantities into electrical signals. They all transmit information about the quantity that is being measured. Depending on transducer used, the information detected may be discontinues on/off (binary) or continuous (analog) representation of the input quantity There are many types of inputs such as: Pushbuttons Proximity Sensors Limit Switches Temperature Sensors Pressure Sensors‌‌.. etc 20

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Types of Input Transducers Transducers

Measured Quantity

Output Quantity

Switch

Movement / Position

Binary Voltage

Limit Switch

Movement / Position

Binary Voltage

Thermostat

Temperature

Binary Voltage

Thermocouple

Temperature

Varying Voltage

Thermistor

Temperature

Varying Resistance

Strain Gauge

Pressure / Movement

Varying Resistance

Photo Cell

Light

Varying Voltage

Proximity Cell

Presence of Objects

Varying Resistance

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Pushbuttons Normally Open Pushbutton (NO) Normally Closed Pushbutton (NC) The NO Pushbutton consists of Normally Open contacts and When pressing it, the two contacts will be connected together to permitting electrical signal pass through them.

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The NC Pushbutton consists of Normally Closed contacts witch are passed electrical signal through them and by pressing it the two contacts will be disconnected and no current passing through them.

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Limit Switches This type of switches is used to detect or limits the movement of mechanical systems such as gates It could have two or three points (COM, NO, NC)

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Inductive Proximity Sensor The sensor incorporates an electromagnetic coil which is used to detect the presence of a magnetic metal object. When a metal target enters the field, eddy currents circulate within the target. This causes a load on the sensor, decreasing the amplitude of the electromagnetic field. As the target approaches the sensor the eddy currents increase, increasing the load on the oscillator and further decreasing the amplitude of the field. The trigger circuit monitors the oscillator’s amplitude and at a predetermined level, it switches the output state of the sensor from its normal condition (ON or OFFf). As the target moves away from the sensor, the oscillator’s amplitude increases. At a predetermined level, the trigger switches at the output state of the sensor, return back to its normal condition (ON or OFF).

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Industrial Electronics Course

Capacitive Proximity Sensor Capacitive proximity sensors are similar to inductive proximity sensors. The main difference between these two types is that capacitive proximity sensors produce an electrostatic field instead of an electromagnetic field. Capacitive proximity switches will sense metallic as well as nonmetallic materials such as paper, glass, liquids, and clothes. Three-wire, DC proximity sensor can either be PNP (Sourcing) or NPN (Sinking). This refers to the type of transistor used in the output switching of the sensor. Dielectric Dielectric Output Trigger Oscillator Oscillator Output Trigger Plate Plate

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Sourcing / Sinking This refers to the type of transistor used in the output switching of the sensor.

Sourcing / PNP Sensor

Sinking / NPN Sensor

If the sensor is inactive then the transistor is off. That means the PNP output will have no current in/out. When the sensor is active this will turn on the transistor, and will allow current to flow from V+ through the sensor to the output (hence sourcing). The voltage on the PNP output will be pulled up to V+. Note: the output voltage will always be 1-2V lower than the supply voltage, because of the transistor voltage drop. When the sensor is in the off state, the PNP output will float, if it used with digital circuitry a pull-down resistor will be needed.

If the sensor is inactive then transistor is off, that means the NPN output will have no current in/out. When the sensor is active, this will turn on the transistor, and This will allow current to flow into the sensor to ground (hence sinking). The voltage on the NPN output will be pulled down to V-. Note: the output voltage will always be 1-2V higher than the negative voltage because of the transistor voltage drop. When the sensor is in the off state, the NPN output will float, if it used with digital circuitry a pull-up resistor will be needed .

Physical phenomenon

Sensor and Detector

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V+

V+

Physical phenomenon Current flows out when switched on

Sensor Output

V-

V-

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V+

V+ Sensor and Detector

V-

Sensor Output

Current flows in when switched on

V-

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Outputs Output devices (like relays, pumps, motors..) are tools used by a control system to alter certain key elements or quantities within the process. They are convert signals from the control system into other necessary quantities. They are also transducers but contrary signals from the control system into other necessary. There are also discontinuous (binary) or continuous (analog) devices.

Output Device

Input

Quantity Produced

Motor

Electrical

Rotational motion

Pump

Electrical

Rotational motion + product displacement

Piston

Hydraulic / pneumatic

Linear motion / pressure

Solenoid

Electrical

Linear motion / pressure

Heater

Electrical

Heat

Valve

Electrical / Hydraulic / pneumatic

Orifice variation

Relay

Electrical

Elec. Switching / limited physical movement

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Processing Section This corresponds to the operations required to keep process “in control” in conjunction obtained from input readings, producing resultant output actions. Input causes output action due to a control plan which can either hardwired or programmable

System

Type

Hardwire

Program

Relay

Digital

×

Electronic Logic

Digital

×

Pneumatic Logic

Digital

×

Analog electronics

Analog

×

Computers

Digital / Analog

×

Microcomputer

Digital / Analog

×

PLCs

Digital / Analog

×

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Industrial Electronics Course

Concept of Relay Control Concept : Controlling very high power at the output using a very low power of control signal at the input. Input :

Very Low [ Voltage and Current, then Power ]

Output :

Very High [ Voltage and Current, then Power ] S M 24VDC 0.1A

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380VAC 50A

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Industrial Electronics Course

Relay Operation

Relay Deenergized

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Relay Energized

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Industrial Electronics Course

Relay Logic Controller R L C

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Industrial Electronics Course

U

Q1

V

W

V1

5

13

21

14

22

3 4

6

1 2

W1

M 3~ U2

V2

W2

6

I> I> I> 4

A1

56 U1

M 3~ 2

A2

55

67

K1

K1T 68

14

S2

5

3

22

14 1

21

13

S1

S2

22

S1

21

13

Graphic Symbols

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Industrial Electronics Course

Motor Starting Power Circuit

5

1

3

L1 L2 L3 N PE Q1

3

6 5

2 1

4

I> I> I>

2

4

6

U

V

W

K1

M 3~ 33

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Industrial Electronics Course

Motor Starting Control Circuit

L

21

F1

13

13

22

S2

14 A1

14

K1

S1

A2

K1

34

N

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Ladder Diagram

%I0.0

%I0.1

%Q0.0

%Q0.0

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Ladder Diagram Versus Relay Control L

21

F1

22

S2

%Q0.0

%Q0.0

13 14 A1

14

K1

S1

%I0.1

13

%I0.0

A2

K1

N 36

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Industrial Electronics Course

Reverse Rotation Power Circuit L1 L2 L3 N PE

1

3

5

Q1

I> I> I> 2

4

6

1

3

5

1

3

5

2

4

6

2

4

6

U

V

W

K1

K2

M 3~ 37

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Control Circuit

Industrial Electronics Course

Reverse Rotation

L

21

F1

K1

N

21 24 A2

K2 A2

K1

A1

A1

22

K1 22

K2

38

13

23

13

S3 21 14

S3

K2 14

14

S1

14

13

13

22

S2

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Star-Delta Starting Power Circuit L1 L2 L3 N PE

1

3

5

Q1

I> I> I> 2

4

6

1

3

5

2

4

6

U1

V1

W1

K1

1

3

5

1

3

5

2

4

6

2

4

6

K2

K3

M 3~ U2

39

V2

W2

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Star-Delta Starting

Control Circuit L

21

F1

13

13

22

S2

S1

14

K3 13

14

67

55

14

K1

K1T 21

21

68

56

K1T

A1 A2

K2 A2

K1 A2

K3

A1

A1

22

K3 22

K2

N 40

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Programmable Logic Controller P L C

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Comparison with Other Control Systems C/Cs

Relay systems

Computers

PLC systems

Type

Digital

Digital / analog

Digital / analog

Design

Hardwire

Programmable

Programmable

Price Per Function

Fairly Low

High

Low

Physical Size

Bulky

Fairly Compact

Very Compact

Operating Speed

Slow

Fairly Fast

Fast

Noise Immunity

Excellent

Fairly Good

Good

Installation

Time Consuming in All Phases

Time Consuming in Programming

Easy in All Phases

Complex Operation

None

Yes

Yes

Ease of Changes

Very Difficult

Quite Simple

Very Simple

Easy of Maintenance

Poor - large No. of Contacts

Poor-several Custom Boards

Good-few Standard Cards

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Industrial Electronics Course

Structure Programmable controller Programming panel

Program memory Work memory

Control unit

Process

Input circuits

Input devices

Output circuits

Output devices

Power supply

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Industrial Electronics Course

Power Supply •PLCs internal circuitry operates at +/-5V DC. •Whether the available supply is AC or DC, a power supply is required to condition, regulate, ... this supply to the adequate need of the circuitry.

~

Rectifier

44

Filter

Regulator

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Protection

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Industrial Electronics Course

Central Processing Unit “CPU� (1) The CPU controls and supervises all operation within PLC, carrying out programmed instructions stored in the memory. An internal communications highway or bus system carries information to and from CPU, memory and I/O units, under CPU control. The CPU is supplied with a clock frequency by a quartz crystal or RC oscillator with speed depending on the microprocessor type. The clock determines the operating speed of a PLC and provides timing / synchronization of all system elements. 45

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Industrial Electronics Course

Central Processing Unit “CPU” (2)

ROM with fixed operating system program Control unit

ALU Control Section

Registers

Analysis Peripherals

I/P scan block

Logic scan program

I/P Modules

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O/P scan Interface with block other CPUs O/P Modules

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Industrial Electronics Course

Central Processing Unit “CPU” (3) B u f f e r Optional Program Storage

Address Bus Control Bus

User Program RAM B u f f e r

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B a t t e r y

μP CPU

C l o c k

System ROM

Data RAM

I/O Unit

Data Bus

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Industrial Electronics Course

I/O Modules PLCs operate at 5V DC to 15V DC, whilst process signals can be much greater or of different levels. The I/O units form the interface between microelectronics of PLC and the real world outside.

the

These units provide all necessary signal conditioning and isolation functions. I/O modules are available (Digital, Analog) with all different process signals which allow PLC to be directly connected to process. 48

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Discrete Input Module Wiring of Input Module Plant Supply

Plant Neutral

C

0

1

2

3

4

5

6

7

Input Module Block Diagram Input Input terminals 49

Indicator

Common

Electrical Isolation

Input Filter

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Logic Circuits

Logic output to processor

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Industrial Electronics Course

DC Discrete Input +ve Internal Supply R3 R2

Input Terminals

Opto-isolator

R4

Buffer To CPU

R1 C D1

common

D1 is input signal indicator R2 limits input current R4 and C are provides filtering effect 50

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Industrial Electronics Course

DC Discrete Input with Reversed Polarity +ve Supply +/-

R3 R2

Input Terminals

Opto-isolator

R4

Buffer To CPU

R1 C

-/+

D1

D1 is input signal indicator R2 limits input current R4 and C are provides filtering effect 51

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Industrial Electronics Course

AC Discrete Input +ve Supply VAC R3

Input Terminals

R2

R1

Opto-isolator

NE

R4

Buffer To CPU

C

common

NE is input signal indicator R2 limits input current R4 and C are provides filtering effect 52

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Discrete Output Module Wiring of Output Module Output Module C

0

1

2

3

4

5

6

7

L1

L2

L3

L4

L5

L6

L7

L8

Plant Supply

Plant Neutral

Block Diagram Output from processor

Output Logic Circuits

53

Electrical Isolation

Trigger Control

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Solid State switch or relay

Indicator

Output terminals

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Industrial Electronics Course

Discrete Transistor Output Module

+ve Internal Supply

R2

Opto-isolator

+ve Plant Supply

R3

Output Load From CPU

R1 R4

-ve Plant Supply

-ve Plant Supply

PLC 54

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Plant AL SHOROUK ACADEMY

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Analog I/O Analog Input Process I/P Signal

PLC

Signal Conditioning

I/P Module

A/D Converter

0 → 10V

0 → 10V

0 → 255 8 Bit

CPU

Analog Output PLC CPU

Process

D/A Converter

O/P Module

0 → 255

4 → 20mA

Amplifier

O/P Signal

8 Bit 55

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Prof. Dr. Mohamed Ibrahim MAHMOUD

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Housing Small PLCs are build of individual printed circuit cards within single compact unit Small PLCs are constructed modular basis with function modules slotted into the back plane connectors of the mounting rack Modular systems housing or mounting racks are equipped with buses to exchange all information required to run the system: data, control, address,‌etc.

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I/O Scanning Output Scan

Input Scan Program Scan INPUT T E R M I N A L S

Input

User

Output

Status

Program

Status

table

Execution

table

OUTPUT T E R M I N A L S

Input Scan

Program Scan

Output Scan

Input terminals are read and input status table is updated accordingly.

During program scan data in I/P table is applied to user program, program is executed and O/P table is updated accordingly.

Data associated with O/P status table is transferred to O/P terminal.

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Communication Point to Point

Links:

Links:

•PLC w/ programming terminal.

•PLC w/ other PLC.

•PLC w/ Man Machine Interface.

•PLC w/ any intelligent device.

58

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Communication Networking

Remote I/O 59

Master/slave Mohamed I. MAHMOUD

Peer to Peer AL SHOROUK ACADEMY

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Prof. Dr. Mohamed Ibrahim MAHMOUD

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Programming Equipment Allowing writing, editing and monitoring a program as well as performing various diagnostic procedures. Three types of programming tools are in common use: 1. Hand held programmer 2. Portable programming terminal 3. Software to run on PC The third type is commonly used and have larger capabilities.

60

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Prof. Dr. Mohamed Ibrahim MAHMOUD

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Program Design Steps 1. Description of system objectives. 2. Detailed description of system function. 3. Circuit diagram or block diagram of the system. 4. Separation of function steps. 5. Choice of PLC Function. 6. PLC input/output connection. 7. Input/output addresses. 8. Program list or diagram 9. Program test and verification. 10. System verification. 61

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Programming Languages IEC 1131 – 1

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IEC 1131 1979 :The International Electrotechnical Commission assigned the research committee 65A to define a PLC standard. Objective :to meet the increasing complexity requirements of control and monitoring systems and the large number of PLCs which are incompatible with each other. Its contents : IEC1131-1 : General information (1992). IEC1131-2 : Specifications & equipment testing (1992). IEC1131-3 : Programming languages (1993) IEC1131-4 : Recommendation to the user. IEC1131-5 : Message handling functions specifications. 63

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IEC 1131-3 This standard describes Two textual languages

Two graphic languages

•Instruction list •structured Text

IL ST

•Ladder Diagram •Function Block

LD FB

A graphic chart •Sequential Fn. Chart SFC 64

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Instruction List (IL) Series of instructions, each one must start on a new line. One instruction = operator + one or more operations separated by commas. Function Blocks lunched using a special operator. Label Operation Run: LD ANDN ST 65

Operand %IX1 %MX5 %QX2 Mohamed I. MAHMOUD

Comment (*pushbutton*) (*run*) AL SHOROUK ACADEMY

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Structured Text (ST) Syntax similar to that of Pascal enabling a description of complex algorithmic structure succession of statements for assigning variables, controlling functions and function blocks, using operators, repetition, conditional executions. Function blocks launched using a special operator. J:=1 WHILE J<=100 & X1<>X2 DO J:=J+2 END_WHILE 66

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Ladder Diagram (LD) Graphic elements organized in networks connected by power supply rails. Elements used: contacts, coil, functions, function blocks control elements (jump, return, etc.) Start

Stop

run

Aux.

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Function Block Diagram (FBD) Representation of functions by blocks linked to each other. Network evaluation :from the O/P of a function block to the I/P of the connected function block.

auto start

&

manu cmd

&

68

>=1

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run

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Sequential Function Chart (SFC) To describe sequential control function. steps & transitions represented graphically by a block or literally. Transition conditions in LD, FBD, IL or ST languages. Actions associated with the steps :Boolean variables or a section of the program written in one of the four languages. Association between action and steps in graphical or literal form. VA1 NOT_FILL FILL

SILO_VALVE READY

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Hardware â&#x20AC;&#x201C; Software Equivalence During the scan cycle: the PLC takes the action of an input hardware device, introduces it to the corresponding software and executes the related instruction. What is the equivalent of an input device and its corresponding software? Input Hardware Device

Corresponding Equivalent Used Software

Normally Open

Normally Open

Normally Open

Normally Closed

Normally Open

Normally Closed

Normally Open

Normally Closed

Normally Closed

Normally Closed

Normally Closed

Normally Open

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Smart Relays SR2 â&#x20AC;&#x201C; Zelio

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TELEMECANIQUE ZELIO-LOGIC SMART RELAYS ( SR2-B121BD ) SMART RELAYS ARE DESIGNED TO SIMPLIFY THE ELECTRICAL WIRING FOR INTELLIGENT SOLUTIONS.

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THE MAIN PARTS OF SMART RELAY 1

2

3

4

5

1 – Retractable mounting feet 2 – Power supply terminals 3 – LCD, 4 lines, 18 characters 4 – Screw terminal block for digital inputs 6

5 – Screw terminals block for analog inputs

7

6 – Connector for backup memory or PC connection cable

8

7 – Shift key 8 – Selection and validation key

9 1

9 – Arrow keys or after first configuring them, Z pushbuttons 10 – Relay output terminal block

10 73

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The description of each part that used in the operation of the smart relay are illustrated in the above slide. Study each part in the order explained. It is enough here to know the name of each part and a brief explanation about this part.

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CHARACTERISTICS OF THE SR1-B121BD 1. Weekly clock 2. Supply voltage:

24VDC(19.2VDC Min, 30VDC Max)

3. Rated input current:

100mA

4. Number of discrete inputs:

4 inputs

5. Rated voltage for each discrete input:

24VDC

6. Number of analog inputs 0-10V: 4 Each analog input is also usable in discrete I/O mode, 24VDC. 7. Number of output relays: 8. Relay output voltage:

74

4 From 5 to 150VDC 8A Max, Or from 24 to 250VAC, 8A Max

Mohamed I. MAHMOUD

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The characteristics of the smart relay are illustrated in the above slide. Study each one in the order explained. It is important here to know the name of each component and the minimum, typical (rated) and maximum voltage and/or current about this component.

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CONNECTING DISCRETE INPUTS Fuse

I1 to I4 are discrete inputs 24VDC IB, IC, ID, and IE represent the analog inputs used as discrete 24VDC inputs 75

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The input block of the smart relay are illustrated in the above slide. This block explain the discrete terminals that connected to 24 V DC. At the left hand side the two terminals ( + and 0 V ) are used to supply the smart relay Zelio by the rated 24 V. The terminals I1 to I6 are discrete inputs that connected to the sensors of the controlled system. The terminals IB and IC may used as discrete terminals for 24 V sensors or used as inputs for analog sensor rate 0 to 10 V DC. The above connections are used for 24 V supply and 24 V discrete or digital input that provided by digital sensors. All the necessary information are written on the body of the smart relay. The ground resistances are connected internally through the 0 V terminal.

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CONNECTING ANALOG INPUTS 0 -10 V ANALOG. 1

2

3

4

Fuse

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The terminals IB and IC may also used as analog inputs that have a voltage range from 0 to 10 V. Three terminals analog sensors that operate on 24 V DC and produces 10 V DC maximum are connected to the terminals IB and IC as illustrated in the above slide. The sensor terminals must be checked to right connection to the power supply and to the input terminals. The ground resistances are connected internally to the 0 V terminal.

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CONNECTING DISCRETE OUTPUTS

L/+

Fuse

Load 1

Load 2

Load 3

Load 4

N/• +/- for the terminals of a DC voltage • L/N for line and neutral of an AC voltage 77

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The terminals of the output block are located at the lower end of the smart relay. This block consists of four relays operate either by DC or by AC voltage. The connection is illustrated in the above slide using the rated operating range: 1 – DC voltage range from 12 to 125 V DC; ( + / - ) terminals. 2 – AC voltage range from 12 to 240 V AC; ( L / N ) terminals. Each relay can support 8 A at the nominal operating voltage mentioned above. The contacts of the relays are connected in series between the supply and the load for each load individually.

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COMMAND KEYS

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The smart relay Zelio has eight keys can be used for programming in the Zelio mode. Four Keys can be configured to be used in the run mode as input switches. Del. To delete an item or a diagram line. Ins. line To insert a diagram line. Sel. / Ok Allows to make a selection (variable, fields) to be modified, enter into an item's parameters page, enter into a visualization page, or validate a choice. The first thing you must do is press this key to access the main menu. Esc. To exit from a menu or a selection. Z1 to Z4 Allows to move through the data input zone. The movement is visualized on the screen. For the items of a diagram, these keys also allow you to navigate through its parameters and then modify their value.

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COMMAND KEYS

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The smart relay Zelio has eight keys can be used for programming in the Zelio mode. Four Keys can be configured to be used in the run mode as input switches. Del. To delete an item or a diagram line. Ins. line To insert a diagram line. Sel. / Ok Allows to make a selection (variable, fields) to be modified, enter into an item's parameters page, enter into a visualization page, or validate a choice. The first thing you must do is press this key to access the main menu. Esc. To exit from a menu or a selection. Z1 to Z4 Allows to move through the data input zone. The movement is visualized on the screen. For the items of a diagram, these keys also allow you to navigate through its parameters and then modify their value.

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POWERING UP THE ZELIO When you switch on the supply the screen displays the INPUTS-OUTPUTS Screen.

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* Objective: This function allows you to choose the language used by the module. All the messages can be displayed in 6 languages: English, French, German, Italian, Spanish and Portuguese. You can only choose the language if the module is in RUN mode. * Zelio mode: 1. Select the Config. menu and then the Language menu, 2. Select the language using the arrow keys, 3. Validate with the Sel./OK key. A small symbol indicates the selected language <> * Free mode: 1. Select the Module/Configure Module menu, 2. Select the language, 3. Validate.

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THE ZELIO MAIN MENU

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The main menu permitting you to access all the functions and parameters of all the zelio operations. There are eight menus. Among these menus there are two have sub – menus. CONFIG. (configuration) have five sub- menus and TRNSFER have four sub – menus. Most elements of this menu are self explanatory but some of them need definition such as: PARAMET. Menu This menu allows you to modify the parameters configured or the parameters of the function blocks. VISU. menu This function allows you to select the information that will be displayed on the third line of the screen of the module being used.

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THE ZELIO MAIN MENU

PASSWORD FILTER Zx KEYS CYCLE & WATCHDOG

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The main menu permitting you to access all the functions and parameters of all the zelio operations. There are eight menus. Among these menus there are two have sub – menus. CONFIG. (configuration) have five sub- menus and TRNSFER have four sub – menus. Most elements of this menu are self explanatory but some of them need definition such as: PARAMET. Menu This menu allows you to modify the parameters configured or the parameters of the function blocks. VISU. menu This function allows you to select the information that will be displayed on the third line of the screen of the module being used.

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ELEMENT ENTRY

It is only possible to position an element (contact or coil) when the blinking cursor â&#x20AC;&#x153; â&#x20AC;? is displayed on the screen. Contact entry is performed in the Five left hand columns, coils can only be entered into the last (sixth) column. If you use the arrow right key move the cursor from left to right positions you will have the following positions and shapes of the cursor.

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Zelio mode: Contacts are entered on the three left-hand columns. Place the flashing square cursor at the desired point. Click on the Sel./ OK key. Choose the item you want by clicking the Z1 and Z3 keys. Click on the Sel./ OK or Z2 key to position yourself on the number. Choose the number using the Z1 and Z3 keys.6. Validate with the Sel./ OK or Z2 key. To modify an item: position yourself on the item you want to modify and carry out the same procedure as for entering a new item. To delete an item: position the cursor on the desired item then press the Del key. Free mode (Principle) Select the desired item (the inaccessible items are dimmed), Enter the comment if applicable, Drag the selected item to the desired contact box. To modify the properties of an item: right click on the item. To change the item's type: select the new type and position it on the contact. To delete an item: select the item and press the Del key. To enter a line comment, click on the comment zone, enter the comment and press Enter to validate.

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Controller Function Blocks C F B

84

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TIMER FUNCTION BLOCK

85

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Objective The Timer function block allows you to time actions. It has: a reset input RT, a command input TT, an end of timing output T or t, a preselection value.

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TIMER FUNCTION BLOCK Program

Note: If the timer function Block name contain reset we must use it, and if not it is optional 86 M. Shams El-Deen

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY 86

Description of the parameters TT : command Used as a coil, this item represents the Timer function block's command input. Its operation depends on the type used. RT : reset Used as a coil, this item represents the reset input. Exciting the coil results in: - the Timer's current value being reset, - contact T being deactivated, the block is ready for a new timing cycle. T (Normally Open) t (Normally Closed) Used as contact it represent the timer output, and it depends on the type selected.

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TIMER PARAMETERS

87 M. Shams El-Deen

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY 87

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TIMER FUNCTION BLOCK PARAMETERS Zelio Mode

88

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Zelio mode To enter the block type and the preset value. Once you have validated the block number, the input screen is displayed. 1. Select the type function block operation using the arrow keys and validate with Sel./OK. 2. Select the time unit S - 1/100 of seconds : 00.00 s (maximum : 99.99), - 1/10 of seconds : 000.0 s (maximum : 999.9), - minutes : seconds : 00 :00 M : S (maximum : 99 :59), - hours : minutes : 00 : 00 H : M (maximum : 99 :59), 3. Enter the preset value using the arrow keys and validate with Sel./OK, 4. Lock the parameters if necessary using the arrow keys and validate with Sel./OK. 5. End the entry by pressing Esc. to return to command diagram entry.

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TIMER FUNCTION BLOCK PROPERTIES Free Mode

89

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Free mode To enter the block type, the preset value and/or lock this parameter. 1. Double click on a timer item or switch to parameter mode and double click on the timer, 2. Select the type of function block operation 3. Select the time unit S- 1/100 of seconds : 00.00 s (maximum : 99.99) - 1/10 of seconds : 000.0 s (maximum : 999.9) - minutes : seconds : 00 :00 M : S (maximum : 99 :59) - hours : minutes : 00 : 00 H : M (maximum : 99 :59) 4. Enter the preset value. 5. Tick the lock box if necessary, 6. Enter the comment if applicable, 7. Validate.

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TYPES OF TIMER FUNCTION BLOCK (1) 1. Type A Timer Function Block (On Delay Timer) 1. Type A Timer Function Block (ON Delay Timer)

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Type a : Closing delay on command rising edge with Reset.

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TYPES OF TIMER FUNCTION BLOCK (2) 2. Type a Timer Function Block (ON Delay with Pulse and Reset Timer)

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Type a : Closing delay on command rising edge with Reset.

AL SHOROUK ACADEMY

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TYPES OF TIMER FUNCTION BLOCK (3) 3. Type C Timer Function Block (OFF Delay Timer)

92 M. Shams El-Deen

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY 92

Type B : Calibrated pulse on command input rising edge (temporary contact). Switching on a light by means of a pushbutton with a timer switch.

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TYPES OF TIMER FUNCTION BLOCK (4) 4. Type B Timer Function Block (Pulse with Pulse On)

93 M. Shams El-Deen

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY 93

Type C : Opening delay (Rest delay). Example: maintain fan operation after motor shutdown.

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TYPES OF TIMER FUNCTION BLOCK (5) 5. Type W Timer Function Block (Pulse with Pulse Off)

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Type W : Calibrated pulse on command input falling edge. Example: Closing a motorway toll gate

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TYPES OF TIMER FUNCTION BLOCK (6) 6. Type D Timer Function Block (Flashing Relay Timer)

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Type D : Symmetrical flashing. Example: fault indication by indicator light flashing.

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TYPES OF TIMER FUNCTION BLOCK (7) 7. Type d Timer Function Block (Flash Timer On and Reset)

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Type d : Symmetrical flashing on command input rising edge Example: pulsed brake command after power cutout.

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with Reset.

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TYPES OF TIMER FUNCTION BLOCK (8) 8. Type T Timer Function Block (Time On Addition)

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Type T : Totalizer with Reset. Example: request replacement of a filter when the recommended utilization time has been exceeded.

AL SHOROUK ACADEMY

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TYPES OF TIMER FUNCTION BLOCK (9) 9. Type AC Timer Function Block (Timing after closing and opining opining control)

98 M. Shams El-Deen

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY 98

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TYPES OF TIMER FUNCTION BLOCK (10) 10. Type L Timer Function Block (Asymmetrical Flashing)

99 M. Shams El-Deen

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY 99

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TYPES OF TIMER FUNCTION BLOCK (11) 11. Type I Timer Function Block (Asymmetrical Flashing .start/Stop .start/Stop on pulse)

100 M. Shams El-Deen

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY 100

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COUNTER FUNCTION BLOCK The Counter function is used to upcount or downcount pulses. The Counter function can be reset to zero or to the preset value (depending on the chosen parameter) during use. It can be used as a contact to find out if: The preset value has been reached (upcounting), The value 0 has been reached (downcounting). Counter maximum Value: 32767 Number of Counters: 16

Counter Function Block Contacts 1. Normal Counter Function Block Contact (C) The contact is closed when the counter reaches the preset value 2. Reverse Counter Function Block Contact (c) 101

The contact is closed until the counter has its preset value Mohamed I. MAHMOUD

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The Counter function blocks are used to count pulses and trigger an action. C or c : Counting threshold reached Used as a contact, this Counter function block item indicates that the preselection value and the current value are equal. C: The contact is closed when the counter has reached the preselection value. c: The contact is closed as long as the counter has not reached its preselection value. Example: Switching on an indicator light connected to the module's output 1 when the preselection value is reached, otherwise the indicator light is off. C1—————— Q1

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COUNTER FUNCTION BLOCK Counter Function Block Coils Count input: CCx Every time the coil is energized, the counter is incremented or decremented by 1 according to the counting direction chosen Reset input:

RCx

resets the counting function to its initial state The current counting value is reset to zero if the counting type is TO (upcounting towards the preset value), The current value is reset to the preset value if the counting type is FROM (downcounting from the preset value). Counter direction input (up/down counting) DCx Downcounts if the coil is energized, Upcounts if the coil is not energized. 102

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C, c contacts are entered in the same way as a conventional contact. RC, CC, DC coils are entered in the same way as a conventional coil. Zelio mode To enter the CC preset value ( 0 to 9999 ). 1. Click on the Z4 and Z2 keys to position yourself on the parameter you want to modify. 2. Select the parameter by pressing the Sel./ OK key. 3. Modify the value of the parameter using the Z1 and Z3 keys. 4. End the entry by pressing Esc. to return to command diagram entry. 5. Lock the parameters if necessary using the arrow keys and validate with Sel./OK.

AL SHOROUK ACADEMY

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COUNTER FUNCTION BLOCK I Program

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CC : count pulse input Used as a coil in a command diagram, this item represents the block's counting input. Each time the coil is excited, the counter is incremented or decremented by 1 depending on the counting direction you have chosen. Example: counting on the input to the Counter N°1 function block. I1—————— CC1 RC: counter reset Used as a coil in a command diagram, this item represents the Counter block's reset input. Exciting the coil will result in the current counter value being reset. Example : Reset counter N°1 when key Z1 is pressed. Z1—————— RC1

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Industrial Electronics Course

COUNTER FUNCTION BLOCK II Zelio Mode

104

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DC : count/countdown direction Used as a coil in a command diagram, this item represents the counter input that determines the counting direction. If this coil is excited, the function block counts down, otherwise the function block counts. By default (this input is not wired) the function block counts. Example: counting or counting down depending on the state of one of the logic module's inputs. I2—————— DC1 p=0000: Preselection value (0 to 9999) Value to be reached. This value is also called the preselection value. When the counter's current value is equal to the preselected value, the counter's contact C is closed. This parameter can be modified.

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Industrial Electronics Course

COUNTER FUNCTION BLOCK III

105

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Lock parameters This parameter is used to lock the function block. When the block is locked, the preselection value no longer appears in the modifiable parameters. C or c : Counting threshold reached Used as a contact, this Counter function block item indicates that the preselection value and the current value are equal. C: The contact is closed when the counter has reached the preselection value. c: The contact is closed as long as the counter has not reached its preselection value. Example: Switching on an indicator light connected to the module's output 1 when the preselection value is reached, otherwise the indicator light is off. C1—————— Q1

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Industrial Electronics Course

TSX NANO PLC

106

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Mohamed I. MAHMOUD

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106


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Small Form Factor - 3 Sizes Base PLC non-extendable PLCs (14 and 20 I/O). Base PLC non-extendable PLCs with 1 integrated analog input (10, 16, and 24 I/O). I/O extensions (16 and 24 I/O). Base PLC or I/O extension extendable PLCs (10, 16 and 24 I/O). 10 I/O (6 Inputs, 4 Outputs) 85 x 105 x 60 mm

14 I/O (8 inputs + 6 outputs) 16 I/O (9 inputs + 7 outputs) 85 x 135 x 60 mm

107

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16 I/O (9 inputs + 7 outputs) 20 I/O (12 inputs + 8 outputs) 24 I/O (14 inputs + 10 outputs) 85 x 165 x 60 mm

Mohamed I. MAHMOUD

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107


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Main Function of TSX Nano PLCs Scanning:

Normal (cyclical) or periodic (2 to 150 ms)

Scan Time:

Less than 1ms for 1000 instructions, Less than 0.6 ms for 100 instruction

Execution Time:

0.2µs to 2µs for a single Boolean elementary instruction

Memory capacity: Data: 256 internal word, 64 constant word, 128 internal bits, Program: 1000 instructions Backup:

PLC RAM: by battery, 30 days

Language:

Reversible PL7 instruction list or ladder

Terminal port:

RS 485 link, UNI-TE protocol 9600 bits/s, 19200bits /s. Max. distance :FTX 117: 10m; UNI-TE: 50m

I/O Extension:

1 per PLC (Max. distance 200 M)

Peer PLCs:

3 (Max. distance 200M)

Function Blocks:

32 Timers, 16 Counter, 4 LIFO/FIFO Registers (16-word block), 8 Shift Registers (16bits), 4 Drum controllers.

108

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AL SHOROUK ACADEMY

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Industrial Electronics Course

TSX Nano PLC Front Panel Front Panel Presentation Power supply connection

Sensor supply

Connection of inputs

Selector Switch for PLC Function Code

Removable cover for protecting terminals

Analog module addressing selector

PLC status display Communication Port

Connection of outputs 109

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Extension port Mohamed I. MAHMOUD

Hinged Cover AL SHOROUK ACADEMY

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Industrial Electronics Course

Characteristics of TSX 07 32 1028 Nano PLC Extendable Supply voltage:

110/240VAC

Number of discrete inputs:

6 inputs

Type of inputs

24VDC

Number of output

4

Type of outputs

Relay

Relay voltage:

24VDC, Or 24/240 VAC 2A Max

110

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110


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC Inputs Connection Connection of the Positive Logic (sinking) Input 3 wire prox. sens. sens.

100/240VAC 100/240VAC

2 wire prox. sens. sens.

3A PNP

L N 100/240VAC

+ 24VD

OUT

IN COM

0

1

2

3

4

5

I

RUN

ERR

0

1

2

3

0

1

2

3

4

5

O COM

I/O

111

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111


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC Inputs Connection Connection of the Negative Logic (source) Input 3 wire prox. sens. sens.

100/240VAC 100/240VAC

2 wire prox. sens. sens.

3A

NPN

L N 100/240VAC

+ 24VD

IN COM

OUT

0

1

2

3

4

5

I

RUN

ERR

0

1

2

3

0

1

2

3

4

5

O COM

I/O

112

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AL SHOROUK ACADEMY

112


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Industrial Electronics Course

PLC Outputs Connection

I

RUN

ERR

0

1

2

3

0

1

2

3

4

5

O COM I / O

OUT COM

0

1

2

OUT COM

3

INPUTS 24VDC OUTPUTS 2A Ry

NC

IN 0 – 10 V + -

*

L/+ N/N/-

L/+ N/N/-

24VDC or 240VAC 2A MAX * Fuse rated for load 113

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Mohamed I. MAHMOUD

AL SHOROUK ACADEMY

113


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Characteristics of TSX 07 32 1012 Nano PLC Extendable Supply voltage:

24VDC

Number of discrete inputs:

6 inputs

Type of inputs

24VDC

Number of output

4

Type of outputs

Transistor Positive logic (Source)

Transistor voltage:

24VDC, 0.5A Max

114

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114


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC Inputs Connection Connection of the Positive Logic (sinking) Input 3 wire prox. sens.

24VDC

2 wire prox. sens.

3A

PNP

+

-

NC

24VDC

IN COM

Nc

0

1

2

3

4

5

I

RUN

ERR

COM

I/O

0

1

2

3

0

1

2

3

4

5

O

115

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Mohamed I. MAHMOUD

AL SHOROUK ACADEMY

115


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC Inputs Connection Connection of the Negative Logic (source) Input 3 wire prox. sens.

24VDC

2 wire prox. sens.

3A

NPN

+

-

NC

24VDC

IN COM

Nc

0

1

2

3

4

5

I

RUN

ERR

0

1

2

3

0

1

2

3

4

5

O COM

I/O

116

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Mohamed I. MAHMOUD

AL SHOROUK ACADEMY

116


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC Outputs Connection

I

RUN

ERR

0

1

2

3

0

1

2

3

4

5

O COM I / O

OUT COM

0

1

2

3

-V

INPUTS 24VDC OUTPUTS 0.5A Tr Sce

A

B

SG

* +

-

24VDC 24VDC

* Fuse rated for load 117

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AL SHOROUK ACADEMY

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

I/O Addressing %

I or Q

0 or 1

â&#x20AC;˘

Symbol

i i=I/O number

I = input Q = output

Point

0 = Base PLC 1 = I/O extension Examples %I0.1 : Second input on base PLC %Q1.2 : Third input on extension PLC 118

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118


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

A Simple Example AND Function S1

S2 L

Supply

N S1

~

Load

S1

S2

119

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S2 Load

M

Mohamed I. MAHMOUD

AL SHOROUK ACADEMY

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Ladder Logic Vs Conventional Control L2

L1

start 3 4

M

L1

3

aux 4

stop

M-aux.

L1 L2 L3

T1 T2 T3 M

%I0.1 %I0.0

%Q0.1

common I/P#1 I/P#2 I/P#3

%Q0.1

I/P#4 120

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common

P L C

O/P#1

M

O/P#2 O/P#3 O/P#4 AL SHOROUK ACADEMY

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Industrial Electronics Course

FUNCTION BLOCKS 121

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Industrial Electronics Course

Timers [%TMi] %I0.0

%TMi IN

%Q0.0

Q

TYPE TON TP 1 min ADJ Y %TM0.P: 9999

There are three types of timer: On Delay timer. Off Delay timer. Pulse timer ⌦ Number of timers 0 to 31 ⌦ Time Base 1min (by default), 1s, 100ms, 1ms(for Tm0 and Tm1). 122

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Industrial Electronics Course

ON-Delay Timer “TON” %TMi IN

Q

TYPE TON TP 1 min ADJ Y %TM0.P: 9999

IN Q PV CV 123

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123


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

OFF-Delay Timer “TOF” %TMi IN

Q

TYPE TOF TP 1 min ADJ Y %TM0.P: 9999

IN

Q PV CV 124

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Industrial Electronics Course

PULSE Timer “TP” %TMi IN

Q

TYPE TOF TP 1 min ADJ Y %TM0.P: 9999

IN

Q PV CV 125

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Industrial Electronics Course

Counters [%Ci] %I0.0 %I0.1 %I0.2 %I0.3

%C0 R

%Q0.0

E

%Q0.1

S D ADJ Y %C0.P: 9999 CU F

%Q0.2

CD

Number of Counters 0 to 15. current value = preset value when S=1. current value = 0 when R=1 %Ci.D=1 when current value = preset value. %Ci.E=1 when current value changes from 0 to 9999. %Ci.F=1 when current value changes from 9999 to 0. 126

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Industrial Electronics Course

Up/Down Counters

Up %C0 R

E

Down

S ADJ Y %C0.P: 3 CU

D

Reset

CD

F

PV CV O/P

127

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AL SHOROUK ACADEMY

127


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

PLC Sequencer (Drum Controller) PLC sequencer operates on a similar principle to an electromechanical drum controller, which changes step according to external events. On each step, the high point of a cam gives a command which is executed by the control system. In the case of a drum controller (PLC sequencer), these high points are symbolized by state 1 for each step and are assigned to output bits %Qi.j or internal bits %Mi, known as control bits. %DR0 R

F

U STEPS 8

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AL SHOROUK ACADEMY

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Drum Controller Characteristics %I0.0 %I0.1

%DR0 R

%Q0.0

F

U STEPS 8

Number of Drum Controllers 4 (0 to 3) Number of Steps 8 (default) Control Bits 16 Control Bits Input R return controller to step 0 Input U on raising edge cause controller to advance by one step Output F indicates that the current steps equals the last steps 129

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Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Operating Diagram

Input

U:

Input

R:

Step No. %DRi.S

0

1

2

3

L-1

0

1

2

0

1

Output %DRi.F

130

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130


Prof. Dr. Mohamed Ibrahim MAHMOUD

Industrial Electronics Course

Drum Controller Configuration

131

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plc2