![]() Maintainance in most facilities (particularly manufacturing) frequently connect directly to PLCs and in online mode they can watch the code execute graphically to figure out what's wrong.įor instance, if an output isn't turning on, they'll type the output electrical device ID into the find function of the programming software, find that output coil, and start tracing back from there looking for issues. The biggest difference that I tell people is that PC program code should be written as if other programmers are the audience, but PLC programs (ladder logic) must be written as if maintenance people are the audience. It's very dangerous to make the switch either way, because a lot of the skills that you think should be transferrable (patterns and such) lead you very far astray. ![]() I did a lot of PLC programming, and now do quite a bit of.
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