Omron CS1W-NC113 Manual page 295

LED Error Indicators
LED
R E E S D X
U R R E A
N C H N T
S A
F F F F F F
F F f F F F
F f F F F F
F f f F F F
F f F f f F
F f F f f f
The status of the LED indicators on the front of the PCU can be used to diagnose
errors as shown in the following table. The status of the indicators is as follows:
f: ON
l: Flashing
F: OFF
---: S When a data error or an external sensor input error occur, the indicator for
the corresponding axis will flash.
S In normal operation, the indicator will be lit during pulse output, and be unlit
while pulse output is stopped.
Error
Y Z U
PC power supply
F F F
OFF
Not mounted to
Backplane
Watchdog timer
error
CPU Unit power
interruption
Setting error
F F F
PCU error
F F F
Unit type error
F F F
System software
F F F
error
RAM error
F F F
Cause
The PC's power supply is
OFF.
The PCU is not mounted
securely to the PC
Backplane.
The watchdog timer for the
PCU turned ON.
An interruption in the power
supply was detected at the
CPU Unit.
The unit number set for the
PCU is outside the
acceptable range.
The unit number set for the
PCU is the same as the
unit number set for another
Unit (unit number
duplication).
I/O table has not been
created.
Communications with the
CPU Unit are not possible.
Unexpected operation
occurred at the PCU.
There is a fault in a
component of an I/O card
or bus ASIC in the PCU.
The system software for the
Unit has been destroyed.
There is a fault in the
PCU's RAM.
Section 11-3
Remedy y
Turn ON the PC's power
supply.
Mount the PCU to the
Backplane securely.
Mount the PCU to the
Backplane securely and
reset the power supply.
Remove the cause of the
power interruption and
reset the power supply.
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.
Change the unit number
setting, reset the power
supply, and create an I/O
table from the CPU Unit.
Create an I/O table from
the CPU Unit.
Mount the Unit to the
Backplane securely.
Replace the PCU.
Replace the PCU.
Replace the PCU.
Replace the PCU.
285