Phase 1:  Don't try to write the PLC program yet.  Sketch out a flowchart of your program on paper.  This sounds like a simple step, but even if you think you have the program operation clear in your mind it's much easier to have a plan to refer to. It's a good to play with the software to get familiar with it.  Go through all the drop-down menus and look at the functions available, even if you may not know yet what they do.  Know that they're there. Phase 2:  Google "State Machin
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