16961

Common Causes

• Attempt to execute a motion or I/O action while syntax check mode is active via PI services (_N_CHKSEL, _N_CHKRUN, or _N_CHKABO)
• Program logic error attempting to call functions that modify machine state during pre-execution verification phase
• Improper sequencing of syntax check initiation and function activation in custom macro or automation routine
• Concurrent triggering of action commands while _N_CHKRUN syntax check service is in progress

Troubleshooting Steps

1. 1Verify syntax check is not active before issuing motion or control commands; confirm _N_CHKSEL, _N_CHKRUN, and _N_CHKABO services have completed or been aborted
2. 2Review program logic and automation routines to ensure prohibited actions (parameter %2) are not called during syntax verification phase
3. 3Check PI service sequencing in part program or macro; ensure action commands follow completion of syntax check operations
4. 4Examine channel %1 configuration and any custom macro calls that may be triggering functions during the syntax check window
5. 5Clear the alarm, disable syntax check mode if not required, and restart the program or function execution after syntax check completes