6-9
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
6
6-1-7 Handling Errors
Additional Information
The CJ2 CPU Units support the following function.
• Startup Condition Setting
After the power supply is turned ON, it is possible to start operation of the CPU Unit in RUN
mode or MONITOR mode even if there is one or more Units that has not completed startup.
Select the Start running program when initializing Unit/Inner board recognition Check Box in
the PLC Setup. For details, refer to the CJ-series CJ2 CPU Unit Software User's Manual
(Cat. No. W473).
The CPU Unit is being reset, and Programming Devices cannot be connected.
z Error Causes and Remedies
*1 The following table shows the allowable power supply ranges for each Power Supply Unit.
Precautions for Correct UsePrecautions for Correct Use
Observe the following points when using Expansion Racks.
• Always confirm the safety of any related equipment before turning the power supply ON or
OFF.
• When the power supply is interrupted to an Expansion Rack, the CPU Unit will stop program
execution and the same operations as are performed when the power supply to the CPU Unit
is interrupted will be performed. For example, if the power OFF interrupt task is enabled, it will
be executed. If power is then restored to the Expansion Rack, the CPU Unit will perform star-
tup processing. The same operational status as existed before the power interrupt will not nec-
essarily be continued.
CPU Reset
POWER RUN ERR/ALM Error flag Error code
Error infor-
mation
Lit. Not lit. Not lit. None None None
Suspected cause of error Confirmation method Remedy
Prevention of
recurrence
Power to an Expansion Rack is OFF. Use a tester to measure
the voltage at the input
terminals of the Power
Supply Unit.
*1
Turn ON the
power.
Investigate the
reason that the
power was OFF.
The I/O Connecting Cable is incorrectly installed.
• The IN-OUT connectors are reversed.
• The cable does not have good contact at the
connectors.
• Two or more I/O Control Units are mounted on
the CPU Rack, or an I/O Control Unit is
mounted to an Expansion Rack.
Check the connections. Reconnect
the cable.
If the Cable is dis-
connected, check
for vibration and
shock.
Model Power supply voltage
Allowable power supply
voltage fluctuation
CJ1W-PA205R/PA202 100 to 240 VAC 85 to 264 VAC
CJ1W-PD025 24 VDC 19.2 to 28.8 VDC
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