Special I/O Unit Setting Error
Omron · CJ-series CJ2 CPU Unit
What does 0x0500 to 0x055F mean?
An installed Special I/O Unit does not match the Special I/O Unit registered in the I/O tables. This indicates a mismatch between the physical hardware and the configured settings, potentially involving synchronous unit operation. Flag A402.02 and Auxiliary Area A428 to A433 indicate the error and the problem unit number respectively.
Common Causes
- Installed Special I/O Unit does not match the registered I/O table entry.
- A Unit specified for synchronous unit operation does not support synchronous unit operation.
- A Unit specified for synchronous unit operation does not exist.
- A Synchronous Unit specified for synchronous unit operation is not on the CPU Rack (it is on an Expansion Rack).
Repair Steps & Checklist
Click steps to track your progress.
- 1
Change the registered I/O table using CX-Programmer to match the physically installed Special I/O Unit.
- 2
Correct the settings for synchronous unit operation in the PLC Setup and transfer the PLC Setup again.
- 3
Move the Synchronous Unit to the CPU Rack if it is currently located on an Expansion Rack.
- 4
Correct the settings in the registered I/O tables if I/O tables have been registered.