Omron SYSMAC C200HS Operation Manual page 83

Programmable controllers

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Basic Ladder Diagrams

Combining AND LOAD and

The following diagram requires AND LOAD to be converted to mnemonic code

because three pairs of parallel conditions lie in series. The two options for coding

the programs are also shown.

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.

The following diagram requires OR LOAD instructions to be converted to mne-

monic code because three pairs of series conditions lie in parallel to each other.

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

codes for both methods are 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.

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