Which device provides end-of-travel feedback by indicating the gate is fully open or fully closed?

• A. Limit switches
• B. Photoelectric sensor
• C. Safety edge
• D. Control board

Answer: (A)

End-of-travel feedback comes from a sensor placed exactly at the gate’s endpoints to signal when the gate has reached its fully open or fully closed position. A limit switch is mounted at those limits and is actuated when the gate reaches them, sending a clear on/off signal to the control system to stop the motor. This provides a precise, definitive indication of the gate’s end position, which is essential to prevent overtravel and confirm where the gate is.

A photoelectric sensor detects the presence or absence of an object by a light beam, typically used for obstacle detection or object presence rather than confirming exact end positions. A safety edge is designed to detect contact with an obstacle to stop motion for safety, not to indicate fully open or closed. The control board is the controller that processes signals, but it relies on sensors like limit switches to know when the gate has reached its end positions.