u/jc31107

I am dealing with a consultant on a PLC project that has a security system background and thinks the two are similar enough that they’re an authority.

They wrote into a sequence of operations that all inputs need to be four state open/active/inactive/short which I’m used to on the security system side of the house, we do it every day, but all the PLC projects at this facility have all been digital thus far.

I’m thinking I have to use all analog inputs and just calculate my value based on open/1k/2k/short and then run with the logic from there, but I wanted to see if anyone else knows of an easier way. It’s all Omron NX series for the PLC.