Program Stop (M00/M01)

From a process perspective, Program Stop (M00/M01) refers to: Program interruption or optional stop. Clear coding around this item prevents modal carry-over and unsafe restart behavior. Managed well, it improves process repeatability and lowers correction workload. Because this is controller-state driven, modal transitions and restart logic must be explicit.

Execution Guidelines

• Validate cancel and return behavior before program end.
• Pair feed and spindle commands with the intended cutting phase.
• Document operator recovery path for optional and forced stops.
• Issue clear safety blocks at operation starts and tool changes.

Practical Warning Signs

• Different outcomes between full run and resumed run
• Subprogram loop or return anomalies
• State leakage across operations

Stability Risks

Most failures come from hidden modal state, missing cancellation, or unclear restart scope. A local edit can silently change downstream behavior if state is not reset.

Process Standardization

Teams usually stabilize this area by standardizing sequence headers and safe-block conventions.

• Keep setup records and inspection evidence linked to each process revision.
• Re-validate after tooling, fixture, or control-logic changes.
• Use first-article and restart checks as mandatory release gates.