It all depends on how the OEM configured the light activation in the ladder.
It sound like when a command is given by cycle start the light will be on, I am suprised it down not go out in MDI without M30?
This sounds like a ladder oversight.
It sounds like you will require the ladder (PMC) program to be changed by someone with ladder programming experience and the necessary programmer.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.