Electrical control now often includes  a "Smart" communication signal superimposed on the 4–20 mA control current, such that the health and verification of the valve position can be signalled back to the controller.
In contemporary electrical control systems, the integration of a "Smart" communication signal into the 4–20 mA control current allows for the transmission of detailed information about the valve's performance, including its accuracy and reliability, to the controller in real-time.