To Next Page

To Previous Page

111

Address Instruction Data

0000 LD NOT 0000

0001 AND 0001

0002 LD 0002

0003 AND NOT 0003

0004 LD NOT 0004

0005 AND 0202

0006 OR LD —

0007 AND LD —

0008 OUT 0502

When determining what logic block instructions will be required to code a dia-

gram, it is sometimes necessary to break the diagram into large blocks and

then continue breaking the large blocks down until logic blocks that can be

coded without logic block instructions have been formed. These blocks are

then coded, combining the small blocks first, and then combining the larger

blocks. AND LD and OR LD is used to combine either, i.e., AND LD or OR

LD always combines the last two execution conditions that existed, regard-

less of whether the execution conditions resulted from a single condition,

from logic blocks, or from previous logic block instructions.

When working with complicated diagrams, blocks will ultimately be coded

starting at the top left and moving down before moving across. This will gen-

erally mean that, when there might be a choice, OR LD will be coded before

AND LD.

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

0503

Block

0006 0007

Block

0002 0003

Block

Complicated Diagrams

Converting to Mnemonic Code Section 7–2

Omron SYSMAC C20P User Manual

Other manuals for Omron SYSMAC C20P