Woodward’s F-Series is either a stand-alone actuator or a combination actuator + throttle body (Integrated Throttle Body [ITB]) with integral electronics. Three versions comprise the product line:
F-Series Modular Actuator
F-Series Throttle (FST)
F-Series Throttle Plus (FSTP)
As part of a total control system, the integral electronics position the throttle according to the command of a separate engine control unit (ECU), and provide position feedback to the ECU. When the CANbus communications interface is used, the electronics also provide diagnostic information to the ECU.