Where used in a control circuit, horns and sirens are connected to the ___ terminals on a programmable controller.

Where used in a control circuit, horns and sirens are connected to the ___ terminals on a programmable controller.

• A. input
• B. output
• C. power
• D. sensor

Answer: (B)

Horns and sirens are actuators (loads) in a control circuit. The programmable controller uses its output terminals to drive such devices, turning them on or off to produce the alert when a condition is met. Input terminals, by contrast, receive signals from sensors or switches that feed information into the PLC, while power terminals supply the controller (and any devices that need a separate supply). A sensor belongs on an input, not at the point where the controller energizes a load.

Horns and sirens are actuators (loads) in a control circuit. The programmable controller uses its output terminals to drive such devices, turning them on or off to produce the alert when a condition is met. Input terminals, by contrast, receive signals from sensors or switches that feed information into the PLC, while power terminals supply the controller (and any devices that need a separate supply). A sensor belongs on an input, not at the point where the controller energizes a load.