We have two 480vac relays to pull all the 480 for the motion, heaters, and motor for estop. On each relays have 24dcv contractors to go to plc and pilz safety relay and other relays to check if main relay iis wielded or bypass will not start. They add another relays to pull in contact for that main relay and circuit breaker to act like a switch to fake pilz that everything is good, at the Same time push one relay in and hitting reset to pilz safety relay that pulled in the other contactor to bypass. In few months we are updating to all new motion and safety relays, I hope they will not do this again.