In ladder diagrams, a normally-open relay contact is drawn as a set of parallel

Question

In ladder diagrams, a normally-open relay contact is drawn as a set of parallel lines, almost like a non-polarized capacitor in an electronic schematic diagram. Normally-closed relay contacts differ in symbolism by having a diagonal line drawn through them. Consider a relay controlled discrete process as illustrated in the above ladder logic diagram, define the logical values of the system variables as follows: (1) Analyze the above relay logic circuit, completing the truth table accordingly: (2) Write down the corresponding Boolean equation for output in terms of the inputs.

Explanation / Answer

exhibit OR gate logic.

Boolean logic for this:

A (1) + B (0) = 1

A(0) + B(1) = 1

A(0) + B(0) = 0

A(0) + B(1) = 1

A B INDICATOR 1 1 1 0 0 0 0 1 1 1 0 1

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