FIELD: electrical engineering.
SUBSTANCE: apparatus to interface with a digital control loop comprises a loop controller to control a control loop, a sensor to provide a measurement value to the loop controller, a device controller to adjust a control device based on an output from the loop controller and a loop interface to receive a set point value and send the set point value to the loop controller wherein the loop interface is different from a host device communicatively coupled to the loop controller. Host device is configured to read the measurement result from the sensor and adjust the controller, when the control from the host device is not overridden by the interface controller.
EFFECT: providing local loop control without the need to use a host device.
20 cl, 5 dwg
