DESIGN WORLD JANUARY 2021 - MAIN ISSUE

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Non-Magnetic Ball Slides When Magnetic Interference CANNOT be Tolerated! CUS TO SLID M ES AVA ILAB LE

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Precision Linear Motion

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DL Linear Actuators Lead Screw/Ball Screw Driven

Beckhoff Automation LLC www.beckhoffautomation.com/vision

Micrometer Positioning Stages

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Micrometer Driven Ball & Crossed Roller Stages

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Solid Models Available for all Del-Tron Model Numbers

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Linear Slides Ball & Crossed Roller

industrial Ethernet system. Due to the high determinism of the EtherCAT protocol and device synchronization via distributed clocks, extremely precise trigger timing and timestamp-based output terminals can send a hardware trigger signal with microsecond-level accuracy to the camera. Because everything takes place in real time in a highly accurate temporal context, image acquisition and axis positions, for example, can synchronize with high precision – a task that PLC programmers frequently handle. Many cameras can also send output signals at previously defined events, such as the start of image capture. These signals can be acquired with a digital input terminal on the EtherCAT network and then used in the PLC for precise synchronization of further processes. Specially developed vision lighting controllers triggered via EtherCAT enable flash lighting with pulses at 50 µsec. Each individual flash can be triggered with great precision by the controller via distributed clocks and timestamping. This ensures that products on a conveyor, for example, reach the exact position before each trigger event. Synchronicity is ultimately a major factor driving the integration of vision technology inside the machine controller and fieldbus. This gives an EtherCAT lighting device high cycle synchronicity, because it’s triggered in the same cycle as the camera recording or the robot movement. Image processing will continue to grow more important and, in many situations, replace sensors as the price point lowers. By standardizing on PC-based automation with scalable controller hardware and a combined real-time and engineering environment, engineers can future-proof vision-intensive applications. DW

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DESIGN WORLD

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