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The following diagram contains only two logic blocks as shown. It is not nec-
essary to further separate block b components, because it can coded directly
using only AND and OR.
00000 00001
00002 00003
00201
00501
00004
Block
a
Block
b
Address
Instruction
Operands
00000
LD
00000
00001
AND NOT
00001
00002
LD
00002
00003
AND
00003
00004
OR
00201
00005
OR
00004
00006
AND LD
—
00007
OUT
00501
Although the following diagram is similar to the one above, block b in the dia-
gram below cannot be coded without separating it into two blocks combined
with OR LOAD. In this example, the three blocks have been coded first and
then OR LOAD has been used to combine the last two blocks followed by
AND LOAD to combine the execution condition produced by the OR LOAD
with the execution condition of block a.
When coding the logic block instructions together at the end of the logic
blocks they are combining, they must, as shown below, be coded in reverse
order, i.e., the logic block instruction for the last two blocks is coded first, fol-
lowed by the one to combine the execution condition resulting from the first
Basic Ladder Diagrams
Section 4-3