Omron C200HX Operation Manual page 105

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Basic Ladder Diagrams

AND NOT 00003

Again, this diagram can be redrawn as follows to simplify program structure and

coding and to save memory space.

The next and final example may at first appear very complicated but can be

coded using only two logic block instructions. The diagram appears as follows:

The first logic block instruction is used to combine the execution conditions re-

sulting from blocks a and b, and the second one is to combine the execution

condition of block c with the execution condition resulting from the normally

closed condition assigned IR 00003. The rest of the diagram can be coded with

OR, AND, and AND NOT instructions. The logical flow for this and the resulting

code are shown below.

Address Instruction

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