Special Unit Recognition/Response Error

What does 2125 mean?

This error occurs when an intelligent function module or special function module is installed but is either not recognized by the CPU (QCPU/LCPU) or fails to respond. This suggests a compatibility issue, incorrect module type, or a hardware fault within the module itself. The error is diagnosed at power ON or reset and will cause the CPU to stop.

• An installed module is not recognized as compatible by the QCPU or LCPU.
• The intelligent function module or special function module is experiencing a hardware fault preventing it from responding.
• Incorrect module type or version installed for the specific CPU model.

Click steps to track your progress.

1. 1

   Verify that only usable and applicable modules compatible with the CPU (QCPU/LCPU) are installed.

2. 2

   Inspect the physical seating and connections of the intelligent function module or special function module.

3. 3

   Reset the CPU module and attempt to transition it to RUN mode.