When An Error Has Occurred In A Redundant Function Module; When An Error Has Occurred In A Sil2 Function Module - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

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 487 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 487 Redundant Function Module Communication Test)

When an error has occurred in a SIL2 function module

When the READY LED turns off
When the READY LED of the SIL2 function module turns off, check the following.
Check item
Check if the SIL2 function module has been properly mounted.
Check if the system was powered on immediately after power-off.
If the READY LED of the SIL2 function module still does not turn on even after the above actions are taken, the possible
cause is a hardware failure of the module. Please consult your local Mitsubishi representative.
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. ( MELSEC iQ-R CPU
Module User's Manual (Startup))
• Check that the length of each tracking cable is within the range of the
specifications. ( MELSEC iQ-R CPU Module User's Manual (Startup))
• 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.
Action
If not, properly mount the module on the base unit.
Wait for five seconds or longer after power-off and power on the system again.
Appendix 3 Troubleshooting by Symptom
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