Hi! nice 2 meet u! Actually i'm a fresh graduate recently. I have a great interest on PLC. Hope that we can keep in contact more frequent so that we may discuss things about PLC and also sharing some experience.
I'm not sure whether i can answer ur question as u demand, but i hope so.
PLC is operate with an input of 24V and also giving an output of 24V. Well, PLC is used in most of the factory. Therefore, it is considered industry standard.
If u have any information or experience regarding the PLC, hope that u will share it with me. Thanks and hope 2 hear from u soon. Good Luck !