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
Upgrade the controller's OS using ControlFLASH to a version compatible with the memory module's user program.
- 2
Obtain a new memory module containing a user program compatible with the current OS.
- 3
Contact your local Rockwell Automation representative for more information about available operating systems compatible with your controller.
Verified technical data. Last updated: March 2026
Related Faults
Source: Allen-Bradley MicroLogix 1400 Programmable Controllers