0018

MEMORY MODULE USER PROGRAM INCOMPATIBLE WITH OS

Allen-Bradley · MicroLogix 1400 Programmable Controllers

What does 0018 mean?

The user program stored in the memory module is incompatible with the controller's current Operating System (OS). This is a non-user fault, indicating a fundamental mismatch that prevents the program from executing correctly.

Common Causes

  • Memory module contains a program compiled for a different or older OS version than currently installed.
  • Controller's OS is too old or too new for the program on the memory module.
  • Controller firmware was updated without ensuring program compatibility.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Upgrade the controller's OS using ControlFLASH to a version compatible with the memory module's user program.

  2. 2

    Obtain a new memory module containing a user program compatible with the current OS.

  3. 3

    Contact your local Rockwell Automation representative for more information about available operating systems compatible with your controller.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley MicroLogix 1400 Programmable Controllers