A machine zone safety system watches a defined danger area around a machine, robot cell or automated equipment and warns, or signals the machine to stop, when a person or vehicle enters it. Detection comes from cameras with drawn zones, laser scanners, light curtains or radio tags. Camera and tag systems added for awareness are a supplementary layer: they do not replace the machine guarding, interlocks and safety-rated controls the machine already needs. Where the system is meant to stop a machine, that stopping function must be designed and validated to the relevant functional safety standard.
In the US, machine guarding duties sit in OSHA 29 CFR 1910.212 and lockout during servicing in 1910.147; a zone system does not satisfy either on its own. For forklifts that work near machines, the same zone logic can trigger warning lights or slow compatible trucks, covered in Forklift geofencing and zone control.
Check whether the supplier states the system is safety-rated or awareness-only, how it fails when power or a camera is lost, and how zones are changed and approved. Automated trucks follow their own standards, set out in AGV forklift safety.