48
5–5–1 Load, Load NOT, AND, AND NOT, OR, and OR NOT
B: Bit
IR, SR, HR, TC, TR
Ladder Symbol Operand Data Areas
Load – LD
B
B: Bit
IR, SR, HR, TC, TR
Ladder Symbol Operand Data Areas
Load NOT – LD NOT
B
B: Bit
IR, SR, HR, TC, TR
Ladder Symbol Operand Data Areas
AND – AND
B
B: Bit
IR, SR, HR, TC, TR
Ladder Symbol Operand Data Areas
AND NOT – AND NOT
B
B: Bit
IR, SR, HR, TC, TR
Ladder Symbol Operand Data Areas
OR – OR
B
B: Bit
IR, SR, HR, TC, TR
Ladder Symbol Operand Data Areas
OR NOT – OR NOT
B
There is no limit in the number of any of these instructions or in the order in
which they must be used as long as the capacity of the PC is not exceeded.
These six basic instructions correspond to the conditions on a ladder dia-
gram. As described in
Section 4 Programming
, the status of the bits assigned
to each instruction determines the execution conditions for all other instruc-
tions. Each of these instructions can be used as many times and a bit ad-
dress can be used in as many of these instructions as required.
The status of the bit operand (B) assigned to LD or LD NOT determines the
first execution condition. AND takes the logical AND between the execution
condition and the status of its bit operand; AND NOT, the logical AND be-
tween the execution condition and the inverse of the status of its bit operand.
OR takes the logical OR between the execution condition and the status of its
bit operand; OR NOT, the logical OR between the execution condition and
the inverse of the status of its bit operand. The ladder symbol for loading TR
bits is different from that shown. See
4–3–2 Ladder Instructions
for details.
There are no flags affected by these instructions.
Limitations
Description
Flags
Ladder Diagram Instructions Section 5–5
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