Duplicate Refresh Error

What does A426.15 mean?

This flag indicates a Duplicate Refresh Error within the CPU. It occurs when a Special I/O Unit IORF(097) or FIORF(225) instruction for interrupt task I/O refresh is executed twice within a minimum interval of 10 ms. This leads to a conflict in I/O refresh operations.

• Special I/O Unit IORF(097) or FIORF(225) instruction for interrupt task I/O refresh executed redundantly.
• Attempted I/O refresh by interrupt task within 10 ms of a previous refresh operation.
• Timing conflicts in program logic related to I/O refresh instructions.

Click steps to track your progress.

1. 1

   Review program logic for IORF(097) or FIORF(225) instructions to ensure they are not called redundantly.

2. 2

   Verify that the execution interval for interrupt task I/O refresh instructions is configured to be greater than 10 ms.

3. 3

   Adjust interrupt task priorities or timing to prevent simultaneous I/O refresh attempts.