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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

40120000 hex

PLC Function Processing Error

Omron · NX-series CPU Unit

What does 40120000 hex mean?

A fatal error has been detected within the PLC Function Module, indicating a critical software malfunction. This error leads to a partial fault level. The user program will stop, and the controller operation will cease.

Common Causes

  • An error occurred in the PLC Function Module software.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Cycle the Controller power supply (turn OFF and then ON) to attempt recovery.

Browse all codes in this manual (17)
Verified technical data. Last updated: April 2026

Related Faults

00090000 hexDIP Switch Setting Error000D0000 hexInternal Bus Check Error000E0000 hexNon-volatile Memory Life Exceeded
Source: Omron NX-series CPU Unit
Open Manual (Page 291)Search more codes in this manual