Which device is commonly used to measure position in automation systems?

Which device is commonly used to measure position in automation systems?

• A. Rotary encoder
• B. Proximity sensor
• C. Pressure sensor
• D. Temperature sensor

Answer: (A)

Position in automation systems is tracked by devices that convert motion into an interpretable signal. A rotary encoder attached to a shaft turns movement into electrical pulses; counting those pulses reveals how far the shaft has rotated and, with multiple channels, the direction. Incremental encoders provide a relative position from a reference, while absolute encoders give a unique position value at all times, even after power is lost. This makes them ideal for precise motion feedback and control in servo systems. In contrast, a proximity sensor detects whether a target is near but doesn’t quantify rotation or position over a range. Pressure sensors measure force per area, and temperature sensors measure thermal conditions. These do not directly provide the rotational position information needed for automation feedback.

Position in automation systems is tracked by devices that convert motion into an interpretable signal. A rotary encoder attached to a shaft turns movement into electrical pulses; counting those pulses reveals how far the shaft has rotated and, with multiple channels, the direction. Incremental encoders provide a relative position from a reference, while absolute encoders give a unique position value at all times, even after power is lost. This makes them ideal for precise motion feedback and control in servo systems.

In contrast, a proximity sensor detects whether a target is near but doesn’t quantify rotation or position over a range. Pressure sensors measure force per area, and temperature sensors measure thermal conditions. These do not directly provide the rotational position information needed for automation feedback.