EL
ErrorLib
Brands
||
  1. Home
  2. Omron
  3. CJ-series CJ2 CPU Unit
  4. 0x0400 to 0x040F
About·Privacy·Terms

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.

0x0400 to 0x040F

CPU Bus Unit Setting Error

Omron · CJ-series CJ2 CPU Unit

What does 0x0400 to 0x040F mean?

An installed CPU Bus Unit does not match the CPU Bus Unit registered in the I/O tables. This error indicates a mismatch between the physical hardware and the configured settings. Flag A402.03 and Auxiliary Area A427 indicate the error and the problem unit number respectively.

Common Causes

  • Installed CPU Bus Unit does not match the registered I/O table entry.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Change the registered I/O table using CX-Programmer to match the physically installed CPU Bus Unit.

Browse all codes in this manual (34)
Verified technical data. Last updated: April 2026

Related Faults

009ABasic I/O Error0x008BDuplicated Refreshing Error0x009ABasic I/O Error
Source: Omron CJ-series CJ2 CPU Unit
Open Manual (Page 395)Search more codes in this manual