Omron SYSMAC C200HS Operation Manual page 87

Programmable controllers

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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 con-

dition 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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