AND Gate Logic in PLC

PLC AND Gate

• We representing a AND Logic Gate with two Inputs A and B.

  

  AND Gate Logic

• When A  AND B are both on is there an output on.
• We use 1 to indicate an on signal and 0 to represent an off signal. So we consider output as 1 must have A  AND B consider 1.

AND Gate Truth Table : 

Inputs		Output
A	B
0	0	0
0	1	0
1	0	0
1	1	1

PLC AND Logic :

• Ladder diagram starts with a normally open set of contact Input A, to represent switch A and in series with normally open set of contact Input B, to represent switch B.
• Terminates with O represent the output. For output on both Input A AND Input B contacts have to be closed.

  

  PLC AND Gate Logic