Both normally open and normally closed pushbuttons can be represented by the XIC or XIO instruction.

Question

Quizplus · Accepted Answer

Both normally open (NO) and normally closed (NC) pushbuttons can be represented using the XIO (eXamine If Open) and XIC (eXamine If Closed) instructions in ladder logic. The XIC instruction is used to examine if the input is closed or energized, while the XIO instruction is used to examine if the input is open or de-energized. Therefore, both types of pushbuttons can be represented using either XIC or XIO instructions.

Both Normally Open and Normally Closed Pushbuttons Can Be Represented