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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 LD. Before AND LD can be used, however,

OR LD must be used to combine the top and bottom blocks on both sides,

i.e., to combine a1 and a2; b1 and b2.

0000 0001 0004 0005

0103

Block

0006 0007

Block

0002 0003

Block

Blocks

a1 and a2

Blocks b1 and b2

Blocks a and b

Address Instruction Operands

0000 LD 0000

0001 AND NOT 0001

0002 LD NOT 0002

0003 AND 0003

0004 OR LD ---

0005 LD 0004

0006 AND 0005

0007 LD 0006

0008 AND 0007

0009 OR LD ---

0010 AND LD ---

0011 OUT 0103

This type of diagram can be coded easily if each block is worked with in or-

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

and b would be combined with AND LD as shown above, and then block c

would be coded and a second AND LD would be used to combine it with the

execution condition from the first AND LD, and so on through to block n.

Block

The Ladder Diagram Section 4-3

Omron SYSMAC C28K User Manual

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