I use a couple of manufacturers: IDEC (the one pictured), Automation Direct, and Mitsubishi. The IDEC and Mistu were given to me and the AD I bought. I like the AD for what I use it for as it is cheap and has some features that work for me. I am by NO MEANS an expert with the ladder logic, I get it to do what I need and it is done for the rest of the year!
Communications is done via RS232 or Ethernet depending on the model and modules you purchase. I download the program to it and it goes about it's merry way!
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