Wiring a Safety Input to PL d: the Device, the Two Channels and What the Relay Expects
Four guard doors on a packing cell, a Trojan T15 tongue switch on each, 440K-T11390, all four pairs of contacts daisy-chained into one 440R-D22R2 relay, and the calculation for that stop function will not go past PL c. Every switch in the chain has its two direct-opening N.C. contacts, the wiring matches the drawing, and … Read more