Special I/O Unit Setting Error

What does A402.02 mean?

This fault indicates a setting error for a Special I/O Unit. When a Special I/O Unit Setting Error occurs, A402.02 and the bit in A428 to A433 corresponding to the Unit's unit number (0-95) are turned ON. The CPU Unit will continue operating, and the ERR/ALM indicator on the front of the CPU Unit will flash. These flags are refreshed when power is turned ON or I/O is recognized.

• Incorrect configuration parameters or settings for a Special I/O Unit (e.g., I/O table, PLC Setup).
• Mismatched hardware or software settings for the Special I/O Unit.

Click steps to track your progress.

1. 1

   Identify the specific Special I/O Unit with the setting error by checking bits A428.00 to A433.15.

2. 2

   Compare the configured settings for the identified Special I/O Unit in the CX-Programmer with the actual hardware.

3. 3

   Reconfigure the Special I/O Unit settings to match the expected parameters.

4. 4

   Cycle power or re-recognize I/O to refresh the status after correcting settings.