Omron CQM1H - PROGRAM Programming Manual page 217

Programmable controllers; inner boards

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Basic Ladder Diagrams

The following diagram requires an OR LOAD followed by an AND LOAD to

code the top of the three blocks, and then two more OR LOADs to complete

the mnemonic code.

Although the program will execute as written, this diagram could be drawn as

shown below to eliminate the need for the first OR LOAD and the AND LOAD,

simplifying the program and saving memory space.

The following diagram requires five blocks, which here are coded in order

before using OR LOAD and AND LOAD to combine them starting from the

last two blocks and working backward. The OR LOAD at program address

00008 combines blocks d and e, the following AND LOAD combines the

resulting execution condition with that of block c, etc.

Address Instruction

Address Instruction

Address Instruction

Blocks d and e

Block c with result of above

Block b with result of above

Block a with result of above

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