Unit Operational Errors - Omron SYSMAC CS Series Operation Manual

Troubleshooting Using LED Indicators
7-2-3

Unit Operational Errors

Unit Operational Errors.
RUN ERH ERC
Not lit Not lit Not lit
Lit
Lit Not lit
Lit
Lit Not lit Not lit
Lit
Lit Not Lit
Lit
Unit Operational errors are errors which can occur during normal operation,
i.e. after normal startup.
The error determination procedure uses the table below. To determine the
error, first find the status of the RUN LED indicator (left column). Then move
one column to the right and find the status of the ERH LED indicator. Then
move again one column to the right and find the status of the ERC LED indi-
cator. The probable error causes are listed to the right of the third column.
Probable cause
Power is not being supplied to the CPU
Unit or the power supply voltage is too low.
The CPU Unit or Backplane is faulty.
The mounting screws on the PROFIBUS
Master Unit are loose (CS Series) or the
sliders are not properly locked into place
(CJ Series).
A fatal error has occurred in the Unit, pre-
venting it from running any program.
A fatal error has occurred in the Unit's pro-
gram. The appropriate error code is stored
in the error log.error
Not a valid combination during operation.
Not a valid combination during operation.
Unit is functionally correct. If there are still problems, proceed to check on the other LED
indicators.
A write-verify check failed, while writing the
error log to the non-volatile memory.
A write-verify check failed, while writing the
(new) configuration to the non-volatile
memory.
Memory in the CPU Unit is faulty.
The CPU Unit is faulty.
A cyclic Monitor time out has occurred, i.e a
timeout on exchange of data between the
Unit and the PLC CPU.
Not a valid combination during operation.
Note If operational errors prevent the Unit from functioning correctly, the PRM,
BST, COMM and BF LED indicators will remain OFF.
Correction
Supply power. Make sure that the correct
voltage is being supplied.
Replace the CPU Unit or the Backplane.
Tighten the mounting screws to the speci-
fied torque (CS Series) or lock the sliders
into place (CJ Series).
Restart the CPU Unit. If the problem per-
sists, replace the PROFIBUS Master Unit.
Restart the CPU Unit. If the problem per-
sists, replace the PROFIBUS Master Unit.
Send a ERROR LOG CLEAR FINS com-
mand to the Unit. Restart the Unit.
Check the Parameter set in CX-Profibus
and re-download the Parameter sets from
CX-Profibus.
If the problem persists, replace the PROFI-
BUS Master Unit.
Restart the CPU Unit. If the problem per-
sists, replace the CPU Unit.
Restart the CPU Unit. If the problem per-
sists, replace the CPU Unit.
Restart the CPU Unit. If the problem per-
sists, replace the PROFIBUS Master Unit.
Section 7-2
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