Duplicate Refresh Error

What does A402.13 mean?

This fault occurs when duplicated refreshing is performed for a Special I/O Unit. When the Duplicate Refresh Error Flag (A402.13) is ON, bit A426.15 indicates the cause of the error, and bits A426.00 to A426.11 contain the unit number (0-95) of the affected Special I/O Unit. The CPU Unit will continue operating, and the ERR/ALM indicator on the front of the CPU Unit will flash.

• Configuration error leading to a Special I/O Unit's refresh being duplicated.
• Incorrect I/O table or PLC Setup settings for a Special I/O Unit.

Click steps to track your progress.

1. 1

   Identify the affected Special I/O Unit by reading the unit number from A426.00 to A426.11.

2. 2

   Review the PLC I/O table and configuration settings for the identified Special I/O Unit.

3. 3

   Ensure that the refreshing mechanism for the Special I/O Unit is configured uniquely.

4. 4

   Clear the error flags (A402.13, A426.15) and the unit number bits (A426.00 to A426.11) after resolving the configuration issue.