36
AND Operation Each rung or network on a ladder represents a logic operation.
The following programming example demonstrates an
AND
operation. Two contact closures and one output coil are placed
on network 1. They are assigned addresses I0.0, I0.1, and Q0.0.
Note that in the statement list a new logic operation always
begins with a load instruction (LD). In this example I0.0 (input 1)
and (A in the statement list) I0.1 (input 2) must be true in order
for output Q0.0 (output 1) to be true. This same logic is also
shown in a function block diagram.
The following truth table represents the state of the output for
each combination of input states.
I0.0 I0.1
Q0.0
0
0
1
1
0
1
0
1
0
0
0
1
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