A simple example of an XIC operator would be ___.

A simple example of an XIC operator would be ___.

• A. Normally-Open pushbutton
• B. Normally-Closed pushbutton
• C. Toggle switch
• D. Open on rise thermostat

Answer: (A)

XIC stands for Examine If Closed, which means the rung will energize only when the input contact is closed (the input is true). A normally-open pushbutton is the textbook example because it is open by default and closes when pressed. That closing state matches the XIC condition directly, so the rung passes current only while the button is actuated. A normally-closed pushbutton would be closed when not pressed, which doesn’t illustrate the “closed when the input is true” behavior of XIC. A toggle switch can be either normally open or normally closed depending on position, so it’s less straightforward as a single, simple example. An open-on-rise thermostat changes state based on temperature and isn’t a basic input closure like an XIC contact. So the normally-open pushbutton best demonstrates the XIC concept.

XIC stands for Examine If Closed, which means the rung will energize only when the input contact is closed (the input is true). A normally-open pushbutton is the textbook example because it is open by default and closes when pressed. That closing state matches the XIC condition directly, so the rung passes current only while the button is actuated.

A normally-closed pushbutton would be closed when not pressed, which doesn’t illustrate the “closed when the input is true” behavior of XIC. A toggle switch can be either normally open or normally closed depending on position, so it’s less straightforward as a single, simple example. An open-on-rise thermostat changes state based on temperature and isn’t a basic input closure like an XIC contact.

So the normally-open pushbutton best demonstrates the XIC concept.