Hi guys
I am currently in the planning/design stage of upgrading a machine which has a lot of redundant relays and other such controls. The main panel itself is a mess of wires and connectors everywhere and not a single drawing exists. I will be installing a PLC and removing a lot of the mess. The thing is this machine has 16 doors on it all with their own safety switch (obviously) which are controlled and monitored through 2 safety relays. My question is how do i incorporate the relay into the PLC i know the relay has an output that connects back to the PLC for monitoring but im not sure how to write this piece of software code into the program. Is it just a matter of a NC contact and if it opens the PLC will not run? Also, if i put the doors and emergency circuit into the relay do i just include the normal stop buttons into the PLC software?
Thanks in advance guys
I am currently in the planning/design stage of upgrading a machine which has a lot of redundant relays and other such controls. The main panel itself is a mess of wires and connectors everywhere and not a single drawing exists. I will be installing a PLC and removing a lot of the mess. The thing is this machine has 16 doors on it all with their own safety switch (obviously) which are controlled and monitored through 2 safety relays. My question is how do i incorporate the relay into the PLC i know the relay has an output that connects back to the PLC for monitoring but im not sure how to write this piece of software code into the program. Is it just a matter of a NC contact and if it opens the PLC will not run? Also, if i put the doors and emergency circuit into the relay do i just include the normal stop buttons into the PLC software?
Thanks in advance guys