A master halt button ______.

• A. Resets the entire line
• B. Halts all the stations at the end of PLC programs
• C. Pauses all operations
• D. Shuts down the entire system

Answer: (B)

A master halt button is a safety control that stops all stations on a production line by forcing the PLCs to de-energize outputs and bring the system into a safe, non-operating state. It is designed to act across the entire line, overriding individual machine controls, so no station can continue running when the button is pressed. This ensures a coordinated, immediate stop for safety and hazard prevention, and it typically latches the system in the halted state until an explicit reset is performed.

This is the best description because it captures the line-wide, immediate shutdown role of a master halt, rather than a partial pause, a simple reset, or an entire power-down of the whole system.