The examine if open instruction is also known as which term?

• A. Examine If Open
• B. Examine If Closed
• C. Output Energize
• D. Set Coil

Answer: (A)

In ladder logic, input testing instructions use mnemonics that expand to plain phrases. Examin e If Open is the full name for the XIO instruction, which checks that the input is not energized (the contact is open). It evaluates to true when the circuit is open, making it the opposite of Examine If Closed (the XIC instruction that checks for a closed, energized input). The other options refer to coil actions rather than input-state checks: Output Energize is the coil that powers the load, and Set Coil is a coil type that latches a state. So the term that matches “examine if open” is exactly Examin e If Open.