Mitsubishi Electronics AJ65SBT-64AD User Manual download pdf (Page 63)

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MELSEC-A

6 TROUBLESHOOTING

6.3 When the digital output value cannot be read

Check item Corrective action

Is the "PW" LED off? Take action as described in Section 6.2 (1).

Is the "RUN" LED flashing or off? Take action as described in Section 6.2 (2), (3).

Is the "L RUN" LED off? Take action as described in Section 6.2 (4).

Is the "L ERR." LED on?

Take action as described in Section 6.2 (7).

Check the error details according to the master

module user's manual.

Is the PLC CPU "RUN" LED flashing or off?

Check the error details according to the PLC CPU

user's manual.

Is the master module "RUN" LED off?

Check the error details according to the master

module user's manual.

Is the master module [RD] [SD] LED on?

Check the error details according to the master

module user's manual.

Is the analog input signal line disconnected, cut off,

or any errors?

Check the error area by checking the signal line

visually or by conductive check.

Remove the AJ65SBT-64AD analog input cable.

Apply the test voltage (stable power supply or

battery) to this module's terminal, and measure the

digital output value.

If he AJ65SBT-64AD module digital output value is

normal, the effects are being received by noise from

an external wiring. So check the wiring and

grounding method.

Lift the AJ65SBT-64AD from the system, and

remove the grounding circuit. (install to the DIN rail.)

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Mitsubishi Electronics AJ65SBT-64AD User Manual Page 63