In ladder logic, which arrangement energizes a rung when two XIC instructions are in series and both are closed?

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Multiple Choice

In ladder logic, which arrangement energizes a rung when two XIC instructions are in series and both are closed?

Explanation:
In ladder logic, placing contacts in series creates a condition that must be true on every element to complete the current path. This is an AND behavior: the rung only energizes if all series contacts are closed. An XIC contact (Examine If Closed) represents a true input when the associated switch is closed. So, when two XIC contacts are in series, both inputs must be ON (both closed) for the rung to energize. If either input is OFF (open), the path is broken and the rung does not energize. To get a different behavior like OR, you’d place contacts in parallel, so any one closed path would energize the rung.

In ladder logic, placing contacts in series creates a condition that must be true on every element to complete the current path. This is an AND behavior: the rung only energizes if all series contacts are closed. An XIC contact (Examine If Closed) represents a true input when the associated switch is closed. So, when two XIC contacts are in series, both inputs must be ON (both closed) for the rung to energize. If either input is OFF (open), the path is broken and the rung does not energize. To get a different behavior like OR, you’d place contacts in parallel, so any one closed path would energize the rung.

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