Patent attributes
The invention relates to a positioner (10) for an actuator (12) comprising a processing unit (22) and an output unit (20) which can be connected to an actuating drive (15) of an actuator (12), as well as a measurement unit (24). The invention is characterized in that said positioner (10) comprises a current source (26) which can be connected to a voltage source (30) of a control system (14) via a single two-wire current loop (28). The invention furthermore relates to a method for operating a positioner (10) including the transmission of measuring values recorded in the positioner (10) to a higher-level controller (14). The method is characterized in that the actuating signals are transmitted in a digital form whereas the measuring data is transmitted to a higher-level controller in an analog form, with both digital and analog signals being transmitted on the same two-wire line.
