okiebob
Member
I am looking for some info concerning the use of Interposing relays, I am using a PLC 5 with 1771 OAD outs to control 12 solenoids. I have heard and read that the inductive "flyback, kickback, EMF" could/will smoke the output channels. BUT I have also read (AB wiring and grounding principles) that using a solid state output with a relay would then ALSO require a surge suppressor / snubber. The relay real estate is not a problem, but I don't want to create a maintenance problem by installing extra hardware to fail and mechanical devices at that. I understand the effect of the inductive kick and have no probs fusing / relay / snubbing as needed but why waste the effort if the 1771-OAD CAN handle the solenoids without further hardware. All replies welcome. Thanks folks