In ladder diagrams, which statement about parallel wiring is true?

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Multiple Choice

In ladder diagrams, which statement about parallel wiring is true?

In ladder diagrams, the way you wire contacts determines the logical relationship between inputs and the output. Parallel paths give the output a chance to energize if any one path is closed, so that behaves like OR logic. For example, two normally open contacts connected in parallel will energize the coil if either contact is closed—any one path being completed is enough. Conversely, placing devices in series requires current to flow through all of them. The coil energizes only when every series path is closed, which is AND logic. NOT logic isn’t produced simply by arranging things in series; it’s handled by using normally closed contacts (inversion) or dedicated NOT elements. So the statement that parallel wiring implements OR logic is the correct one, because parallel paths provide multiple independent routes to energize the output, reflecting OR behavior.

In ladder diagrams, the way you wire contacts determines the logical relationship between inputs and the output. Parallel paths give the output a chance to energize if any one path is closed, so that behaves like OR logic. For example, two normally open contacts connected in parallel will energize the coil if either contact is closed—any one path being completed is enough.

Conversely, placing devices in series requires current to flow through all of them. The coil energizes only when every series path is closed, which is AND logic.

NOT logic isn’t produced simply by arranging things in series; it’s handled by using normally closed contacts (inversion) or dedicated NOT elements.

So the statement that parallel wiring implements OR logic is the correct one, because parallel paths provide multiple independent routes to energize the output, reflecting OR behavior.

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