ControlLogix 5570 T07:C42 after controller swap, what to check?
I just replaced a ControlLogix 5570 controller with a spare, and now it's showing a Major Fault T07:C42. The old controller had been running fine. What should I check first to get this running?
A Major Fault T07:C42 on a ControlLogix controller indicates a revision mismatch. This means the project in the controller's nonvolatile memory has a different firmware revision than the controller itself. This fault typically occurs at power-up or when loading from a memory card, often after a controller replacement.
Likely causes and checks
1Replacement controller has different firmware
- Points to it
- The new controller, despite having the same catalog number, may have shipped with a different firmware revision than the project stored in nonvolatile memory.
- Check
- Read the firmware revision of the newly installed controller and compare it with the firmware revision of the project in nonvolatile memory.
2Controller firmware was updated after the memory card image was stored
- Points to it
- If the controller's firmware was updated at some point, but the memory card still holds a project image from an older firmware revision, this mismatch will cause the fault.
- Check
- Check the firmware history of the controller and the date when the memory card image was last stored.
Next check: The primary corrective action is to update the controller firmware to match the revision of the project in nonvolatile memory.
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