Omron C200HX Operation Manual page 102

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Basic Ladder Diagrams

Combining AND LOAD and

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 be 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.

When coding the logic block instructions together at the end of the logic blocks

they are combining, they must, as shown below, be coded in reverse order, i.e.,

the logic block instruction for the last two blocks is coded first, followed by the

one to combine the execution condition resulting from the first logic block

instruction and the execution condition of the logic block third from the end, and

on back to the first logic block that is being combined.

Address Instruction

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