Omron · SYSMAC CJ2 CPU Unit
This flag indicates that the mandatory END(001) instruction is missing from the PLC program. Every executable PLC program segment must properly terminate with an END(001) instruction to define its logical end. Absence of this instruction prevents proper program execution.
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Ensure that the END(001) instruction is explicitly present at the end of the main program block in the ladder logic.
Recompile and download the entire program to the CPU to verify its structural integrity.
Check for any unused or incomplete program segments that might interfere with the main program's termination.