Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 365

Basic Ladder Diagrams
00000
00002
00004 00005
00006 00007
00002 00003
00001
00004 00005
00006 00007
00000
00001 00002
Block b
Block a
Block c
00003 00004
The following diagram requires an OR LOAD followed by an AND LOAD to code
the top of the three blocks, and then two more OR LOADs to complete the mne-
monic code.
00001
00003
Although the program will execute as written, this diagram could be drawn as
shown below to eliminate the need for the first OR LOAD and the AND LOAD,
simplifying the program and saving memory space.
00000
The following diagram requires five blocks, which here are coded in order before
using OR LOAD and AND LOAD to combine them starting from the last two
blocks and working backward. The OR LOAD at program address 00008 com-
bines blocks d and e, the following AND LOAD combines the resulting execution
condition with that of block c, etc.
Block d
00005
00006 00007
Block e
Address
LR 0000
00000
00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
Address
LR 0000 00000
00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
Address Instruction
LR 0000
00000
00001
00002
00003
00004
00005
00006
00007
00008
00009
Blocks d and e
Block c with result of above
00010
Block b with result of above
00011
Block a with result of above
00012
Section
Instruction Operands
LD 00000
LD 00001
LD 00002
AND NOT 00003
OR LD
AND LD
LD NOT 00004
AND 00005
OR LD
LD NOT 00006
AND 00007
OR LD
OUT LR 0000
Instruction Operands
LD 00002
AND NOT 00003
OR 00001
AND 00000
LD NOT 00004
AND 00005
OR LD
LD NOT 00006
AND 00007
OR LD
OUT LR 0000
Operands
LD 00000
LD 00001
AND 00002
LD 00003
AND 00004
LD 00005
LD 00006
AND 00007
OR LD
AND LD
OR LD
AND LD
OUT LR 0000
6-3
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