When An Error Has Occurred In A Redundant Function Module; When The Run Led Turns Off; When The Err Led Turns On Or Flashes; When The L Err Led Turns On - Mitsubishi Electric MELSEC iQ-R Series User Manual

34.3
When an Error Has Occurred in a Redundant
Function Module

When the RUN LED turns off

When the RUN LED turns off after the redundant function module is powered on, check the following.
Check item
Check if the redundant function module has been properly mounted.
If the RUN LED of the redundant function module still does not turn on even after the above action is taken, the possible
cause is a hardware failure of the module. Please consult your local Mitsubishi representative.

When the ERR LED turns on or flashes

Check the following:
Check item
Check if an error has occurred by performing the module diagnostics.
If the ERR LED still turns on or flashes even after the above action is taken, perform a module communication test and check
the module for a hardware failure. ( Page 428 Redundant Function Module Communication Test)

When the L ERR LED turns on

Check the following:
Check item
Check if the tracking cables used are proper.
Check if each tracking cable has been properly connected.
If the L ERR LED still turns on even after the above actions are taken, perform a module communication test and check the
redundant function module and tracking cables for failures. ( Page 428 Redundant Function Module Communication Test)
Action
If not, properly mount the module on the base unit.
Action
Take actions proposed by the module diagnostics.
Action
• Check if the tracking cables satisfy the standards. ( Page 78
Redundant Function Module)
• Check that the length of each tracking cable is within the range of the
specifications. ( Page 78 Redundant Function Module)
• Check if no disconnection is found on each tracking cable.
Check the connection status of each tracking cable by performing the module
diagnostics. If a tracking cable has not been properly connected, connect it
again.
34 TROUBLESHOOTING BY SYMPTOM

34.3 When an Error Has Occurred in a Redundant Function Module

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