Omron SYSMAC C20P Operation Manual page 116

Converting to Mnemonic Code
Address
0000
0001
0002
0003
0004
0005
0006
0007
0008
Combining AND LD and
OR LD
0000 0001
0002 0003
0004 0005
The first of each pair of conditions is converted to LD with the assigned bit
operand and then ANDed with the other condition. The first two blocks can
be coded first, followed by OR LD, the last block, and another OR LD, or the
three blocks can be coded first followed by two OR LDs. The mnemonic code
for either method is shown below.
Instruction Data
LD
AND NOT
LD NOT
AND NOT
OR LD
LD
AND
OR LD
OUT
Again, with last method (on the right), a maximum of eight blocks can be
combined. 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
both AND LD and OR LD, 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 break block b down further, because it can coded directly using
only AND and OR.
0000 0001 0002 0003
0201
0004
Block Block
a b
Address Instruction
0000 LD
0000
0001 0001 AND NOT
0002 0002 LD NOT
0003 0003 AND NOT
— 0004 LD
0004 0005 AND
0005 0006 OR LD
— 0007 OR LD
0501 0008 OUT
Section 7–2
0501
Data
0000
0001
0002
0003
0004
0005
—
—
0501
0501
109