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Navigate to DIAGNOSIS screen and locate the skip signal input page (usually DIAGNOSIS > PMC or DIAGNOSIS > I/O). Check the skip signal address assigned in Parameter 6200-6203 (G31 P1-P4 skip signal numbers). Verify the signal state changes when manually triggering the probe.

Inspect physical probe connections, battery level (for wireless probes), and cable continuity between probe receiver and CNC input module. Check input module LED indicators for the skip signal address.

Do not touch probe tip during testing to avoid accidental triggering or damage

Check PMC ladder logic (PMCLAD screen) to verify skip signal is properly routed from input (G address) to CNC interface (F address). Signal path must be continuous without blocking conditions.

Verify input module voltage specifications match probe output (12-24VDC typical). Check input signal polarity matches Parameter 3006 bit 6 (SKP signal polarity setting: 0=normally open, 1=normally closed).

Navigate to SYSTEM > PARAM and verify Parameter 6200 (skip signal number for G31 P1). Ensure it matches the actual X address of the skip input (example: X7.4 = address 7.4). Check Parameters 6201-6203 if using multiple skip signals (G31 P2-P4).

Parameter write-enable must be set (Parameter 0000 bit 0) before modifying parameters

Check Parameter 6202 bits to verify skip function is enabled. Bit 0 enables high-speed skip signal sampling. Verify Parameter 3006 bit 5 (SKP) is set to 1 to enable skip function.

Verify the G31 command syntax in the NC program matches parameter configuration. If using G31 P2, P3, or P4, ensure corresponding parameters 6201, 6202, or 6203 are configured.

Review the G31 block in the NC program and verify the programmed endpoint provides adequate overtravel distance beyond the expected contact point. Typical practice is 5-10mm overtravel beyond expected touch point.

Check work coordinate system offsets (OFFSET/SETTING screen > WORK) and verify workpiece position is within expected location. Incorrect G54-G59 offsets may cause probe to miss the target.

Manually jog the probe toward the measurement point using MPG or incremental jog while monitoring DIAGNOSIS screen skip signal status to verify physical contact triggers the input before executing G31 again.

Use slow feedrate and approach carefully to prevent probe damage

If using macro variables to capture skip position, verify system variables #5061-#5065 (skip position storage) are functioning by checking values after a successful manual trigger test.