# HELP constructing boolean equation and truth tables for seal in rungs

#### gbtbtbt

Joined Mar 18, 2020
70
Would (A'B) + y and (AB)+y be correct? For the truth table, how would I construct it?

Joined Jul 18, 2013
22,680
You do not normally represent an output used inside a rung in that way, it would be a Y (output function) represented as a AND/OR/NOR function etc just identified with the Y designation #.
Max.

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#### gbtbtbt

Joined Mar 18, 2020
70
Can you give an example of how a y(input) is used in the boolean equation? I understand that A only needs to be true when the motor is energized.

Joined Jul 18, 2013
22,680
The Y output function as all the other functions, should have a separate identifier in order to separate one from the other, IOW Y1 Y2 etc, the corresponding function inside a rung would be a boolean function and it identifier, as e.g Y1 -| |- ,
I am no expert on boolean arithmetic only as it pertains to applications such as PLC programming for e.g. and circuit ladder as portrayed in the Schneider PDF.
Max.

#### gbtbtbt

Joined Mar 18, 2020
70
My teacher confirmed that in Boolean it would be Accent A to show NC( B+Y). Thanks for the help.