Omron CPM1

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166

Basic Ladder Diagrams Section 4-3

Combining AND LOAD

and OR LOAD

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 nec-

essary 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 dia-

gram 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.

00000 00001 00002 00003

00201

10001

00004

Block

Address Instruction Operands

00000 LD 00000

00001 AND NOT 00001

00002 LD 00002

00003 AND 00003

00004 OR 00201

00005 OR 00004

00006 AND LD

–

00007 OUT 10001

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