Special I/O Unit Error

What does 0x0300-0x035F or 0x03FF mean?

An error occurred during data exchange between the CPU Unit and a Special I/O Unit, indicated by A402.06 and A418 to A423. This signifies a communication failure or an internal fault within one of the Special I/O Units (unit numbers 0 to 95).

• Communication failure between the CPU Unit and a Special I/O Unit.
• Internal error within a specific Special I/O Unit.

Click steps to track your progress.

1. 1

   Check the specific Special I/O Unit indicated by A418 to A423.

2. 2

   Refer to the affected Unit's operation manual for detailed troubleshooting steps.

3. 3

   Restart the Unit by toggling its Restart Bit or by cycling its power OFF and ON again.

4. 4

   If the Unit does not restart or the error persists, replace the Special I/O Unit.