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Table Of Contents
Learning RSLogix 5000 Programming
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Logix Designer, like most IEC 61131-3 compliant applications, will take any program you create in any IEC-compatible language, convert it to instruction list (IL)—a low-level language that resembles Assembly), and compile it down to bytecode (the binary language used internally by the controller) in order for the controller to execute it. The following diagram illustrates the way various languages are all compiled down into the same bytecode language:

Language compilation to bytecode in Logix
Ultimately, the controller is not aware of which language you created your program in (Ladder Logic, Function Block, or Sequential Function Chart); it always ends up as the same Bytecode language that is executed on the controller. Within Logix Designer, you can create the exact same program using ladder logic that you would create using function block diagram (FBD), and it would (in theory) translate down to the same Structured Text (ST) commands and compile...
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