Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 362

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Basic Ladder Diagrams

Combining AND LOAD and

The first of each pair of conditions is converted to LOAD with the assigned bit

operand and then ANDed with the other condition. The first two blocks can be

coded first, followed by OR LOAD, the last block, and another OR LOAD, or the

three blocks can be coded first followed by two OR LOADs. The mnemonic code

for both methods is shown below.

Again, with the method on the right, a maximum of eight blocks can be com-

bined. There is no limit to the number of blocks that can be combined with the

first method.

Both of the coding methods described above can also be used when using AND

LOAD and OR LOAD, as long as the number of blocks being combined does not

exceed eight.

The following diagram contains only two logic blocks as shown. It is not neces-

sary to further separate block b components, because it can coded directly using

only AND and OR.

Although the following diagram is similar to the one above, block b in the diagram

below cannot be coded without separating it into two blocks combined with OR

LOAD. In this example, the three blocks have been coded first and then OR

LOAD has been used to combine the last two blocks followed by AND LOAD to

combine the execution condition produced by the OR LOAD with the execution

condition of block a.

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