Omron SYSMAC C200HS Operation Manual page 84

Basic Ladder Diagrams
Block
b1
00000 00001 00002 00003
00004 00202
Block
b2
Block Block
a b
Complicated Diagrams
74
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.
00000 00001
Block
a
Address Instruction
00000 LD
00001 AND NOT
00002 LD
00003 AND
00004 OR
00005 OR
00006 AND LD
00007 OUT
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 in-
struction and the execution condition of the logic block third from the end, and on
back to the first logic block that is being combined.
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. Either
AND LOAD or OR LOAD is used to combine the blocks, i.e., AND LOAD or OR
LOAD 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.
00002 00003
00201
00004
Block
b
Operands
00000
00001
00002
00003
00201
00004
—
00501
Address Instruction
00000 LD NOT
00502
00001 AND
00002 LD
00003 AND NOT
00004 LD NOT
00005 AND
00006 OR LD
00007 AND LD
00008 OUT
Section 4-4
00501
Operands
00000
00001
00002
00003
00004
00202
—
—
00502