Omron SYSMAC C2000H Operation Manual page 61

Basic Ladder Diagrams
54
ever, OR LOAD must be used to combine the top and bottom blocks on both
sides, i.e., to combine a1 and a2; b1 and b2.
Block Block
a1 b1
00000 00001 00004 00005
00002 00003 00006 00007
Block Block
a2 b2
Block Block
a b
Address Instruction
00000 LD
00001 AND NOT
00002 LD NOT
00003 AND
00004 OR LD
00005 LD
00006 AND
00007 LD
00008 AND
00009 OR LD
00010 AND LD
00011 OUT
The following type of diagram can be coded easily if each block is coded in
order: first top to bottom and then left to right. In the following diagram,
blocks a and b would be combined using AND LOAD as shown above, and
then block c would be coded and a second AND LOAD would be used to
combined it with the execution condition from the first AND LOAD. Then
block d would be coded, a third AND LOAD would be used to combine the
execution condition from block d with the execution condition from the sec-
ond AND LOAD, and so on through to block n.
Block Block Block
a b c
Operands
00000
00001
00002
00003
—
Blocks a1 and a2
00004
00005
00006
00007
—
Blocks b1 and b2
—
Blocks a and b
00503
Block
n
Section 4-3
00503
00500