The solution worked because it aligned the physical boundary, the safety controller, and the wireless link around one isolation event.¹

WorkedDid not

Trigger

Door opening

Manual robot buttons

Coverage

All robots

Separate locations

Communication

Rapid frequency hopping

Interference exposure

Safety basis

ISO 13849, Cat3, PLd

Unlinked access action

The design used a VSC on each robot and a master VSC mounted on the door.¹ When the door opened, the system automatically transmitted a safety-rated wireless e-stop signal intended to stop all robots.¹ This made the boundary itself part of the control logic, rather than treating access and robot shutdown as separate tasks.

FORT Robotics also addressed the wireless layer. Rapid frequency hopping was used to minimise interference, while the safety architecture was intended to provide highly reliable communication between endpoints and the master controller.² The system adhered to ISO 13849, Category 3, and Performance Level d safety standards.¹ The reported improvement in worker safety and productivity came from easing entry into the robot area.¹

Wireless E‑stop system isolates mobile robots when humans enter zones