External actions such as push buttons and limit switches are called what?

External actions such as push buttons and limit switches are called what?

• A. Inputs
• B. Outputs
• C. Sensors
• D. Controllers

Answer: (A)

External actions such as push buttons and limit switches are called inputs because they provide signals from the outside world to the control system. They sit at the boundary of the controller and convert a human action or boundary condition into an electrical state (on/off, open/closed) that the controller reads to decide what to do next. Outputs are what the controller drives to act (motors, lights, relays), and sensors are devices that measure physical quantities. So push buttons and limit switches feed the controller as inputs.

External actions such as push buttons and limit switches are called inputs because they provide signals from the outside world to the control system. They sit at the boundary of the controller and convert a human action or boundary condition into an electrical state (on/off, open/closed) that the controller reads to decide what to do next. Outputs are what the controller drives to act (motors, lights, relays), and sensors are devices that measure physical quantities. So push buttons and limit switches feed the controller as inputs.