The ONI FC-431 frequency converter is designed for controlling electric drives in process control systems of medium and high complexity that do not require high regulation precision. Built-in functions allow for efficient electric drive control without the use of external ICS (Industrial Control Systems), and the built-in RS-485 interface with Modbus-RTU protocol, as well as the possibility of installing expansion boards with Profibus, Ethercat, and CANopen protocols, allow this VFD to be integrated into building automation systems of any complexity and scale.