Hi, I am pretty new to PLCs, I have the program attached that requires some changes to it.
There are two inputs (Alarm 1 and 2), at the moment when an alarm occurs it closes the contact. I am looking to change this so that the inputs are energised during “normal” operation and they go open when an alarm condition occurs.
There is a light stack that is illuminated when either alarms occur (Alarm 1 take priority). The outputs energise relays to the light stack to turn on the lights, however at the moment they are wired as NO, however this does not provide “fail safe” should the relays fail. I need to provide fail safe where the relays are energised in Good conditions and then deenergised for an alarm condition. The wiring will be changed to provide this on the relays however I need help on how to change the PLC program for this.
Hopefully this all makes sense.
