Omron SYSMAC C20K Operation Manual page 46

The Ladder Diagram
Address
0000
0001
0002
0003
0004
0005
0006
0007
0008
Address
0000
0001
0002
0003
0004
0005
0006
0007
0008
34
The following diagram requires AND LOAD to be converted to mnemonic
code because three pairs of parallel conditions lie in series. The two means
of coding the programs are also shown.
0000
0001
Instruction Operands
LD 0000
OR NOT 0001
LD NOT 0002
OR 0003
AND LD
LD 0004
OR 0005
AND LD
OUT 0100
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.
The following diagram requires OR LOAD instructions to be converted to
mnemonic code because three pairs of conditions in series lie in parallel to
each other.
0000 0001
0002 0003
0040 0005
The first of each pair of conditions is converted to LOAD with the assigned bit
operand and then ANDed with the other condition. The first two blocks can
be coded first, followed by OR LOAD, the last block, and another OR LOAD,
or the three blocks can be coded first followed by two OR LOADs. The mne-
monic code for both methods is shown below.
Instruction Operands
LD 0000
AND NOT 0001
LD NOT 0002
AND NOT 0003
OR LD
LD 0004
AND 0005
OR LD
OUT 0101
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.
0002 0004
0003 0005
Address Instruction
0000 LD
0001 OR NOT
0002 LD NOT
0003 OR
--- 0004 LD
0005 OR
0006 AND LD
--- 0007 AND LD
0008 OUT
Address Instruction
0000 LD
0001 AND NOT
0002 LD NOT
0003 AND NOT
--- 0004 LD
0005 AND
0006 OR LD
--- 0007 OR LD
0008 OUT
Section 4-3
0100
Operands
0000
0001
0002
0003
0004
0005
---
---
0100
0101
Operands
0000
0001
0002
0003
0004
0005
---
---
0101