Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 364

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Basic Ladder Diagrams

The following diagram must be broken down into two blocks and each of these

then broken into two blocks before it can be coded. As shown below, blocks a

and b require an AND LOAD. Before AND LOAD can be used, however, OR

LOAD must be used to combine the top and bottom blocks on both sides, i.e., to

combine a1 and a2; b1 and b2.

The following type of diagram can be coded easily if each block is coded in order:

first top to bottom and then left to right. In the following diagram, blocks a and b

would be combined using AND LOAD as shown above, and then block c would

be coded and a second AND LOAD would be used to combined it with the execu-

tion condition from the first AND LOAD. Then block d would be coded, a third

AND LOAD would be used to combine the execution condition from block d with

the execution condition from the second AND LOAD, and so on through to block

Blocks a1 and a2

Blocks b1 and b2

Blocks a and b

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