Maintenance Mode
Cha pte r C
Cha pte r C
4.5 CPU state Indicator LED The AML has three LEDs on the circuit board whose illumination is controlled by software. Depending on the lighting status of each LED, the AML operating status can be checked. Table 4.5.1 CPU state indicator LED Description
Indication priority (Small = High)
In normal processing
LED 2 and 3 light up alternately.
7
- In power ON initialization processing - Under execution of program change - System abnormality (CPU exception, etc.)
LED 2 and 3 light up.
2
ROM and RAM check error
LED 2 lights up.
3
Group 1 error (E1
)
LED 2 flashes.
5
Group 2 error (E2
)
LED 3 flashes.
6
Group 3 error (E3
)
LED 2 and 3 flashes.
4
LED 1 lights up.
1
CPU state
LED 3 LED 2 LED 1
In WDT operation
Remove the upper case from the AML main body, and check the LED lighting status. CPU board (Three LEDs are mounted on the backside.)
C - 64
W301-0481E
