What device often receives signals from sensors in a control system?

In a control system, a controller is typically the device that receives signals from sensors. The function of the controller is to process these signals to make decisions based on the measurements taken from the sensors. It interprets the data regarding the system's current state, such as temperature, pressure, or flow rate, and compares it with the desired set point.

Once the controller evaluates these signals, it can determine the appropriate response needed to maintain the desired system performance. This response might involve sending signals to actuators or other devices to make adjustments. The role of the controller is essential in ensuring that the system operates efficiently and safely by continuously monitoring and managing the process based on the input from sensors.

While other devices such as transmitters and relays play important roles in the communication and switching processes within control systems, it is the controller that primarily interprets the data from sensors and drives the overall system operation.