Turning outputs on or off through relay contacts is called ______.

• A. control logic
• B. sequence control
• C. interlock logic
• D. status indication

Answer: (A)

Turning outputs on or off through relay contacts is a form of control logic. In electrical control systems, inputs from sensors or user controls feed a set of rules or a ladder-like arrangement that decides when to energize a relay coil. When the coil is energized, its contacts change state to switch power to an output device, turning it on or off. This is exactly how control logic translates signals into actions on loads.

Sequence control is about the order and timing of multiple operations, interlock logic protects safety by preventing unsafe states, and status indication shows the current state of equipment without driving it.