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TROUBLESHOOTING • FX5U / GX WORKS3
Where can I check FX5U errors in GX Works3?
Open Module Diagnostics while online. It provides CPU/module status and diagnostic information that should be checked before changing logic.
Practical explanation
The hardware documentation identifies Module Diagnostics as the path from the online CPU status display.
Record the error details before clearing anything so the original evidence is not lost.
Check in this order
- 1Capture the error code and occurrence time.
- 2Check the affected module and parameter status.
- 3Correct the cause before clearing the diagnostic.
Last reviewed: 2 October 2026
Official source: FX5S/FX5UJ/FX5U/FX5UC User's Manual (Hardware)Still need help with your machine?
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