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6-3
Section
Basic Ladder Diagrams
347
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.
00002
00003
LR 0000
00000
00001
00004
00005
00006
00007
Address
Instruction
Operands
00000
LD
00000
00001
LD
00001
00002
LD
00002
00003
AND NOT
00003
00004
OR LD
--
00005
AND LD
--
00006
LD NOT
00004
00007
AND
00005
00008
OR LD
--
00009
LD NOT
00006
00010
AND
00007
00011
OR LD
--
00012
OUT
LR
0000
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.
00002
00003
LR 0000
00001
00000
00004
00005
00006
00007
Address
Instruction
Operands
00000
LD
00002
00001
AND NOT
00003
00002
OR
00001
00003
AND
00000
00004
LD NOT
00004
00005
AND
00005
00006
OR LD
--
00007
LD NOT
00006
00008
AND
00007
00009
OR LD
--
00010
OUT
LR
0000
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.
LR 0000
00000
00003
00004
00006
00007
00001
00002
00005
Block e
Block d
Block c
Block b
Block a
Address
Instruction
Operands
Blocks d and e
Block c with result of above
Block b with result of above
Block a with result of above
00000
LD
00000
00001
LD
00001
00002
AND
00002
00003
LD
00003
00004
AND
00004
00005
LD
00005
00006
LD
00006
00007
AND
00007
00008
OR LD
--
00009
AND LD
--
00010
OR LD
--
00011
AND LD
--
00012
OUT
LR
0000
Содержание SRM1 - PROGRAMING 02-2001
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