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54
ever, OR LOAD must be used to combine the top and bottom blocks on both
sides, i.e., to combine a1 and a2; b1 and b2.
00000 00001
00004 00005
00503
Block
a
Block
b
00006 00007
Block
b2
Block
b1
00002 00003
Block
a2
Block
a1
Blocks a1 and a2
Blocks b1 and b2
Blocks a and b
Address
Instruction
Operands
00000
LD
00000
00001
AND NOT
00001
00002
LD NOT
00002
00003
AND
00003
00004
OR LD
—
00005
LD
00004
00006
AND
00005
00007
LD
00006
00008
AND
00007
00009
OR LD
—
00010
AND LD
—
00011
OUT
00503
The following type of diagram can be coded easily if each block is coded in
order: first top to bottom and then left to right. In the following diagram,
blocks a and b would be combined using AND LOAD as shown above, and
then block c would be coded and a second AND LOAD would be used to
combined it with the execution condition from the first AND LOAD. Then
block d would be coded, a third AND LOAD would be used to combine the
execution condition from block d with the execution condition from the sec-
ond AND LOAD, and so on through to block n.
Block
a
Block
b
00500
Block
n
Block
c
Basic Ladder Diagrams
Section 4-3