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Troubleshooting
When modules do not run normally, refer to the following troubleshooting information.
ï‚¢ Programmable controller troubleshooting
1.
First, check the following points.
1) The ON/OFF status of the power supply
2) The mounting condition of the power supply module, the CPU module, and the I/O modules
3) The LED on the front of the CPU module
2. Check the problem and respond according to the following list.
Problem Check Action
The "POWER" LED is
OFF after turning ON the
power supply module.
Is the power supply module
properly wired and
mounted?
Wire and mount the module properly.
3 Mounting Modules (P.10)
4 Wiring Modules (P.11)
The "ERR." LED on the
CPU module is flashing
red.
Are programs and PLC
parameters written to the
CPU module?
Write programs and parameters to the CPU
module.
7 Writing Programs (P.21)
If the CPU has several
programs, are they
registered to the PLC
parameter?
If there are several programs, register them in the
program setting of the PLC parameter, and write
the parameters to the CPU module.
If several programs are not needed, delete
unnecessary data, or execute the Format PLC
memory function before writing data to the
programmable controller CPU.
GX Developer Version 8
Operating Manual: SH-080373E
Other than above
Handle by checking for errors following "Checking
errors in the CPU module" (P.30) in this manual.
The "BAT" LED on the
CPU module is ON or
flashing.
Is the battery properly
connected?
Properly connect the battery.
3 Mounting Modules (P.10)
For details of the troubleshooting, refer to the following manual.
QCPU User's Manual (Hardware Design, Maintenance and Inspection):
SH-080483ENG
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