In CNC programming, what does M01 signify regarding program execution?

In CNC programming, M01 is a code used to indicate optional program execution. When the M01 command is present in a program, it allows the operator to stop the CNC machine if desired when the program reaches that line. If the M01 command is active and no interruption is requested, the machine will continue executing the program. This feature is particularly useful in situations where the operator may want to inspect the workpiece or environment without stopping the entire program, providing greater flexibility during the machining process.

M01 is not associated with mandatory or required execution; those concepts are covered by other codes. It also does not indicate an end to the program, which would typically be signaled by a different code. Understanding how M01 functions helps operators effectively manage the execution of CNC programs and make real-time adjustments as needed.