What computer language is used with a PLC on an assembly line?

Programmable logic controllers can be programmed using different development platforms. One common development platform is called relay ladder logic (RRL). Ladder logic is a programming language based on executing commands on a line-by-line permission system. These ladder logic statements are often termed "rungs." Each ladder logic statement defines the relationship between an output variable and, in most cases, one or more input variables. The PLC responds to the input as directed by a ladder logic program. Ladder logic programs instruct the PLC how and when to react to the different signals it receives.

An alternative is what is called "State Logic." It uses a natural-ish language called ECLiPS (English Control Language Programming Software). I understand State Logic to be more like a finite-state machine idea.

More info:
http://www.electronics-manufacturers.com...

Discussion on different languages:
http://www.nait.org/jit/Articles/wrig089...

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