What is a safety-rated monitored stop in a robotic cell?

• A. A maintenance stop
• B. A safety function that can stop the robot when a monitored boundary is violated or an operator safety device is triggered
• C. A software update routine
• D. A manual override procedure

Answer: (B)

A safety-rated monitored stop is a safety function designed to bring the robot to a controlled, safe stop whenever a monitored boundary is crossed or a safety device is activated. It’s safety-rated, meaning it’s been designed, verified, and documented to meet specific safety standards, with a controller that continuously monitors the boundary devices. When triggered, the robot stops in a way that minimizes risk, and it cannot be restarted until a defined safety reset is performed and the boundary is clear. This ensures an operator cannot resume movement while in or near a hazardous area. It uses safety devices such as light curtains, safety mats, interlocks, or emergency stops, all feeding a safety-rated control system. This differs from a maintenance stop, software update, or manual override, which do not provide the same guaranteed safety state and restart protections.