Bob Axtell <bob.axtell <at> gmail.com> writes:
> Ladder Logic appears to be simple but in fact is very difficult to
> program, even very simple tasks
> take many hours. I was never able to get PLCs to do anything, but
> other people can perform magic. Go figure.

PLC programming is a form of boolean logic programming. With the right tools (or
brains) and a symbolic logic optimizer/mapper once can turn normal algebraic
equations into ladder logic language. The people who do "magic" with PLCs do
just this (higher level design followed by translation/implementation in ladder
logic).

Peter


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