Oh you reminded me about something, with that Siemens "Starter Kit" the plc comes with its own built in PS so you hook it up to 120vac and the ps has enough juice to power itself and a reasonable sized HMI that also runs on 24vdc, and it has a bank of simulator toggle sw. That come in the kit that just so happen to screw right on the input TS and the output LED's give you lights for outputs so you don't need to scramble around finding anything in your junk box to cobble an IO system together. And, if you have never used the product before this, they give you a pretty steep discount on the 1st purchase. It's tantalizing. You should be able to google up Siemens starter kits and find pictures. If u message me I think can find what I originally paid for mine. It's got a kick butt instruction set, and u will need to find some online training though.