Omron CJ1W-C113 - REV 02-2008, Operation Manual

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LED Error Indicators Section 11-3
11-3 LED Error Indicators
The status of the LED indicators on the front of the PCU can be used to diag-
nose errors as shown in the following table.
The status of the LED indicators on the front of the PCU can be used to diag-
nose errors as shown in the following table. The status of the indicators is as
follows:
❍
: ON
✩
: Flashing
●
: OFF
---: • When a data error or an external sensor input error occur, the indicator
for the corresponding axis will flash.
• In normal operation, the indicator will be lit during pulse output, and be
unlit while pulse output is stopped.
RUN
ERC
ERH
NC4 3
Z
U
X
Y
RUN
ERC
ERH
NC2 3
X
Y
RUN
ERC
ERH
NC1 3
X
LED Error Cause Remedy
R
U
N E
R
C E
R
H
X Y Z U
● ● ● ● ● ● ●
PLC power supply
OFF The PLC’s power supply is
OFF. Turn ON the PLC’s power sup-
ply.
Watchdog timer error The watchdog timer for the
PCU turned ON. Mount the PCU securely and
reset the power supply.
CPU Unit power inter-
ruption An interruption in the power
supply was detected at the
CPU Unit. Remove the cause of the power
interruption and reset the
power supply.
● ● ❍ ● ● ● ●
Setting error The unit number set for the
PCU is outside the acceptable
range. Set the unit number for each of
the Units to a setting within the
acceptable range, reset the
power supply, and create an I/O
table from the CPU Unit.
The unit number set for the
PCU is the same as the unit
number set for another Unit
(unit number duplication). Change the unit number set-
ting, reset the power supply,
and create an I/O table from the
CPU Unit.
I/O table has not been created. Create an I/O table from the
CPU Unit.
Communications with the CPU
Unit are not possible. Mount the Unit securely.
● ❍ ● ● ● ● ●
PCU error Unexpected operation occurred
at the PCU. Replace the PCU.
● ❍ ❍ ● ● ● ●
Unit type error There is a fault in a component
of an I/O card or bus ASIC in
the PCU. Replace the PCU.
● ❍ ● ❍ ● ● ●
RAM error There is a fault in the PCU’s
RAM. Replace the PCU.