Interface on Vehicle Assembly Line
Industrial accident: unexpected activation of roller conveyor on vehicle assembly line with worker standing on floor safety mat. Forensic analysis of the original and modified control and safety logic, and also the hardware interface between the Control PLC and a separate Safety PLC. The Safety PLC application was machine safeguarding via light curtains and safety floor mats.
The safety stop interface used Flex I/O on Devicenet for hardwired signals to and from the Safety PLC. Industrial Robot safety standards were applied to the conveyor as an auxiliary system.
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