When The Digital Output Value Cannot Be Read - Toshiba AJ65VBTCU-68ADVN User Manual

6 TROUBLESHOOTING

6.3 When the digital output value cannot be read

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Check item
Is the "POWER" LED off?
Is the "RUN" LED flashing or off?
Is the "L RUN" LED off?
Is the "L ERR." LED on?
Is the PLC CPU "RUN" LED flashing or off?
Is the master module "RUN" LED off?
Is the master module [RD] [SD] LED on?
Is the analog input signal line disconnected, cut off,
or any errors?
Remove the AJ65VBTCU-68ADVN/ADIN analog
input cable. Apply the test voltage (stable power
supply or battery) to this module's terminal, and
measure the digital output value.
Corrective action
Take action as described in Section 6.2 (1).
Take action as described in Section 6.2 (2), (3).
Take action as described in Section 6.2 (4).
Take action as described in Section 6.2 (7).
Check the error details according to the master
module user's manual.
Check the error details according to the PLC CPU
user's manual.
Check the error details according to the master
module user's manual.
Check the error details according to the master
module user's manual.
Check the error area by checking the signal line
visually or by conductive check.
If he AJ65VBTCU-68ADVN/ADIN 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 AJ65VBTCU-68ADVN/ADIN from the
system, and remove the grounding circuit. (install to
the DIN rail.)
MELSEC-A
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