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Access PMC diagnostics: Press SYSTEM > PMC > PMCDGN or PMC LADDER to check signal states. Monitor G007.7 (FIN signal) and relevant M-code completion signals (typically F-addresses assigned to specific M-codes in the ladder).

Check parameter 3111 (WAIT signal timeout) via SYSTEM > PARAM > search 3111. Default is typically 60000ms (60 seconds). Verify if timeout value is appropriate for the machine operation cycle time.

Review PMC ladder logic for the specific M-code or wait condition active when alarm occurred. Verify the ladder includes proper interlock reset logic and completion signal output. Check for stuck relay coils or missing completion pulse generation.

Monitor I/O signals via SYSTEM > PMC > I/O to verify external devices (coolant pumps, tool changers, tailstocks) are sending completion signals back to the machine. Check X-address inputs corresponding to limit switches or proximity sensors.

Ensure machine is in safe state before testing. Some devices may require manual reset after timeout condition.

Identify which M-code or operation was executing when alarm occurred by checking SYSTEM > ALARM > HISTORY or reviewing the program line displayed on alarm screen.

Physically verify the mechanical device completed its intended action. For example, check if tool changer arm returned to home position, tailstock advanced/retracted fully, or chuck pressure reached setpoint.

Use EMERGENCY STOP and lockout/tagout procedures before approaching moving components.

Test sensors and limit switches associated with the device. Access SYSTEM > PMC > I/O DGN and monitor X-address inputs while manually actuating sensors. Verify sensor LED indicators and check wiring continuity with multimeter.

Check hydraulic/pneumatic pressure gauges and solenoid valve operation. Low air pressure or failed solenoid valves can prevent devices from completing movement, leaving sensors in intermediate states.

Review the active G-code program for macro WAIT statements, WHILE loops, or IF-GOTO conditional branches. Check macro variables being monitored (e.g., #3000 series alarm variables, #5000 series work coordinate variables, or custom #500-#999 variables).

Access SYSTEM > MACRO > VARIABLE to check current values of macro variables used in wait conditions. Verify the expected condition can actually be met based on current system state and variable values.

If using custom wait logic with parameter monitoring, verify parameters 3111 (timeout value) and 6000-series macro-related parameters are configured correctly. Check parameter 6010 (macro variable access) and 6001 (macro call method).

Test macro program logic in single block mode (SINGLE BLOCK key active) while monitoring macro variable values in real-time. Modify macro to include explicit timeout counters or error handling if infinite wait conditions are possible.

Test modified macros on non-production parts first to prevent scrapped workpieces.