Which type of contact is closed when the associated instruction is off?

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Multiple Choice

Which type of contact is closed when the associated instruction is off?

Explanation:
In ladder logic, some contacts are designed to conduct when their associated address is off. The one that matches this behavior is XIO, which stands for Examine If Open. It acts as a normally closed contact: it conducts when the input is OFF and opens when the input turns ON. That opposite behavior compared to XIC (Examine If Closed), which closes only when the input is ON, is what makes XIO the correct choice here. A Memory contact simply reflects the state of an internal bit, not inherently tied to being off, and a Seal-In is a latch that maintains its state after being energized, so its behavior isn’t simply tied to the input being off.

In ladder logic, some contacts are designed to conduct when their associated address is off. The one that matches this behavior is XIO, which stands for Examine If Open. It acts as a normally closed contact: it conducts when the input is OFF and opens when the input turns ON. That opposite behavior compared to XIC (Examine If Closed), which closes only when the input is ON, is what makes XIO the correct choice here. A Memory contact simply reflects the state of an internal bit, not inherently tied to being off, and a Seal-In is a latch that maintains its state after being energized, so its behavior isn’t simply tied to the input being off.

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