I am using a Micrologix 1500 1764- LRP Series B for my senior project. I am having a issue. I finally figured out how to add power to turn on the PLC. I am wondering why when i run the program nothing happens. I am expecting that once i have connected the two switches to the input side(applying a 3v power supply) of the PLC then connect a resistor to a LED on the output side. Do I need a relay (whatever that is?)? If I need one where will I find on at? Does someone have a wiring diagram? I am using this at school for a small project. Thank you.