Industrial Automatic Control Systems and Controllers Annotation << Back Automation of the Frequency Control System Based on PLC and SCADA A.P. Kushnir, Vu Hoang Giang The article deals with the architecture of the asynchronous drive frequency control system. The frequency control system is designed to demonstrate and study the operation of a 3-phase asynchronous motor in the frequency control mode and can be used to acquire and consolidate practical skills in controlling an asynchronous motor using an automation system based on a Siemens 1500 PLC, as well as to conduct scientifi c research. The demonstration and research stand is based on a device for obtaining a 3-phase voltage of variable frequency (Omron MX2 frequency converter). The unit also contains a programmable logic controller S7-1500, monitoring and control tools, an asynchronous motor, the load on which can be changed manually using a simple friction brake or an electromechanical load (adjustable DC motor). The control of the electromechanical load is carried out via the armature circuit of the DC motor by pulse-width modulation. The demonstration and research stand allows both direct control and control from a computer in four quadrants by means of a SCADA system developed in the WinCC OA environment. The software for binding the programmable logic controller is implemented in the Tia Portal environment. Keywords: WinCC Open Architecture; frequency converter; programmable logic controller; frequency control; asynchronous motor. DOI: 10.25791/asu.7.2021.1293 Pp. 11-17.