Abstract: This paper studies the networked speed control and closed-loop position control technology of frequency converters based on PROFIBUS-DP fieldbus. The S7-300 PLC master station communicates with the PROFIBUS slave station via the EM277 communication module. The host computer uses WINCC configuration software to realize remote control of the slave PLC and frequency converter, and achieves system integration with the logistics HOSTLINK network through Dynamic Data Exchange (DDE). Keywords: Frequency converter; PROFIBUS-DP; Configuration software; Dynamic Data Exchange 0 Introduction With the continuous deepening of enterprise information technology, the requirements for real-time data communication between field devices and host computers are gradually increasing. Different types of automation equipment and networks need to be integrated into heterogeneous network systems to achieve data sharing and exchange, thereby better meeting the data acquisition requirements of enterprise Manufacturing Execution System (MES) and Enterprise Resource Management System (ERP). This paper studies the network control technology of frequency converters based on PROFIBUS-DP fieldbus and realizes the system integration between the host computer WinCC monitoring software and the logistics HOSTLINK network. For details, please click to download: ProfiBus-DP Fieldbus Inverter Control and HostLink Network Integration