What is the function of the HOLD button when pressed?

The HOLD button serves a specific function within a program control context, primarily designed to temporarily halt the ongoing operation without shutting everything down. When the HOLD button is pressed, it pauses the program, causing any active processes to stop while simultaneously turning off the start light. This allows the operator to halt operations for inspection or safety checks while maintaining the current state of the system. Unlike other functions that might reset or permanently stop the program, the HOLD feature ensures that the program can be resumed easily from the point it was paused once the conditions for continuation are favorable.