410
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
12 Test Operation, Adjustment, Maintenance and Troubleshooting
12.8 Troubleshooting
12.8 Troubleshooting
→ For the procedures on running and stopping the PLC, refer to Section 12.2.
→ For the procedures on operating the display module, refer to Chapter 10.
→
For the procedures on operating peripheral devices, refer to the manuals for the peripheral devices.
12.8.1 Output does not operate (main unit and input/output extension blocks)
→ For the remote I/O station connected to the CC-Link/LT built-in master, refer to Section 12.7.
→ For inputs and outputs of special function units/blocks, refer to each manual.
1. Output does not turn on.
Stop the PLC, and forcibly turn the inoperable output on then off with a peripheral device or the display
module to check its operation.
Check for troubles with external wiring.
• When the output operates
The output may be turned off unintentionally in the program. Reexamine the program.
(Duplicate coil or RST instructions)
• When the output does not operate
Check the configuration of the connected devices and the connection of the extension cables.
If the configuration of the external wiring and connected devices and the connection of the extension
cables are acceptable, the output circuit may be damaged.
Consult your local Mitsubishi Electric distributor.
2. Output does not turn off.
Stop the PLC, and check that the output turns off.
Check for trouble with external wiring.
→ For the procedures on running and stopping the PLC, refer to Section 12.2.
• When the output turns off
The output may be turned on unintentionally in the program.
Check that there are no duplicate coils in the program.
• When the output does not turn off
The output circuit may be damaged. Consult your local Mitsubishi Electric distributor.
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