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Sequence Input Instructions Section 3-3
Description AND LD connects in series the logic block just before this instruction with
another logic block.
The logic block consists of all the instructions from a LOAD or LOAD NOT
instruction until just before the next LOAD or LOAD NOT instruction on the
same rungs.
In the following diagram, the two logic blocks are indicated by dotted lines.
Studying this example shows that an ON execution condition will be produced
when either of the execution conditions in the left logic block is ON (i.e., when
either CIO 000000 or CIO 000001 is ON) and either of the execution condi-
tions in the right logic block is ON (i.e., when either CIO 000002 is ON or
CIO 000003 is OFF).
Flags There are no flags affected by this instruction.
Precautions Three or more logic blocks can be connected in series using this instruction to
first connect two of the logic blocks and then to connect the next and subse-
quent ones in order. It is also possible to continue placing this instruction after
three or more logic blocks and connect them together in series.
When a logic block is connected by AND LOAD or OR LOAD instructions, the
total number of AND LOAD/OR LOAD instructions must match the total num-
ber of LOAD/LOAD NOT instructions minus 1. If they do not match, a program
error will occur.
Example
Coding Example (1)
LD
LD
AND LD
Logic block A
Logic block B
Serial connection between logic block A and logic block B.
to
to
Instruction Operand
LD 000000
OR NOT 000001
LD NOT 000002
OR 000003
AND LD ---
LD 000004
OR 000005
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