Omron CJ1W-MA - REV 10-2008, Operation Manual

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LED Error Indicators Section 12-3
12-3 LED Error Indicators
The status of the LED indicators on the front of the PCU can be used to diag-
nose the following errors.
RUN: The PCU is operating.
ERC: An error has occurred in the PCU.
ERH: An error has occurred in the CPU Unit.
ERM: An error has occurred in the MECHATROLINK device.
MLK: Indicates MECHATROLINK communications status
The indicator displays indicate the first error that is detected.
If the cause of an error has been cleared using ALARM RESET when two or
more errors have occurred at the same time, the PCU will detect the next error
with the highest priority and the indicator display will switch to show the new
error. If multiple errors occur with the same priority level, the error for the
smaller axis number will be displayed first.
12-3-1 Error Indicators at Powerup
NCF71
MLK
RUN
ERC
ERH
ERM
Indicator status Category Probable cause of
error
Countermeasure
RUN ERC ERH ERM MLK
Not lit Not lit Not lit Not lit Not lit CPU Unit power
interruption Power is not being sup-
plied correctly to the
CPU Unit. Check the power sup-
ply voltage being sup-
plied to the CPU Unit
and make sure the cor-
rect power is being
supplied.
Unit system
error The PCU system is not
operating correctly. Make sure that the
PCU is installed cor-
rectly, and turn the
power OFF and ON
again. If the error
occurs again, replace
the PCU.
Not lit Not lit Lit Not lit Not lit Setting error The PCU's unit number
is the same as another
Unit. After changing the unit
number, cycle the
power and create the I/
O tables from the CPU
Unit.
The PCU is not regis-
tered in the CPU Unit's
I/O tables, or the regis-
tered status does not
match. Create the I/O tables
for the CPU Unit again.
Data transfer
error The transfer of data
between the PCU and
CPU Unit could not be
executed correctly. Make sure that the
PCU is installed cor-
rectly, and turn the
power OFF and ON
again. If the error
occurs again, replace
the PCU or CPU Unit.