Omron C200H Operation Manual page 67

Basic Ladder Diagrams
Address
00000
00001
00002
00003
00004
00005
00006
00007
00008
Combining AND LOAD and
OR LOAD
54
or the three blocks can be coded first followed by two OR LOADs. The mne-
monic codes for both methods are shown below.
Instruction Operands
LD 00000
AND NOT 00001
LD NOT 00002
AND NOT 00003
OR LD
LD 00004
AND 00005
OR LD
OUT 00501
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.
The following diagram contains only two logic blocks as shown. It is not nec-
essary to further separate block b components, because it can be coded di-
rectly 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 dia-
gram 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, fol-
Address Instruction
00000 LD
00001 AND NOT
00002 LD NOT
00003 AND NOT
— 00004 LD
00005 AND
00006 OR LD
— 00007 OR LD
00008 OUT
00002 00003
00201
00004
Block
b
Operands
00000
00001
00002
00003
00201
00004
—
00501
Section 4-3
Operands
00000
00001
00002
00003
00004
00005
—
—
00501
00501