[Objective] In view of the prominent supply chain security risks associated with the FF(Foundation Fieldbus) master station in power industrial control systems, where the relevant chips, protocol stacks, and configuration tools have long been heavily reliant on imports, a full-chain localization research and development of the FF H1 fieldbus master station was carried out based on the Ruiwo DCS technical platform. The aim of this work is to break the foreign monopoly on key components and basic software, achieve completely independent and controllable master station hardware and software, and provide solid technical support for the supply chain security of power industrial control systems and for national energy security.

[Methods] In terms of hardware, domestic discrete components are adopted to construct the MAU(Medium Attachment Unit) physical layer circuit. In the transmitting path, precise modulation of bus signal was realized through reference voltage selection combined with a constant-current closed-loop control circuit, which ensures that the transmission current accurately tracks the command value and thereby improves the accuracy of signal modulation. In the receiving path, frequency-selective amplification was adopted to extract the modulated bus signal from background noise, and hysteresis comparison circuits are used for receiving and shaping bus signals to guarantee the integrity of signal transmission. For the software side, the FF communication protocol stack was programmed on an embedded processor, realizing such core functions as system management services, link scheduling, and cyclic and acyclic data communication based on virtual communication relationships, which fully meet the requirements of real-time performance and reliability for field-level control. In addition, the supporting configuration tool was developed based on the Kylin operating system, covering the complete engineering application workflow , including device description file parsing, function block configuration, network configuration, online monitoring and maintenance. 

[Results] Systematic tests showed that, with 16 slave devices mounted on each of the two network segments, device configuration and data communication could operate stably and reliably. The read and write status of the four typical types of process data, namely AI(analog input), AO(analog output), DI(digital input), DO(digital output), remained normal throughout the tests; and no error frames were detected by continuous message monitoring under long-term operating conditions, which fully verifies the correctness of master station’s communication functions and data interaction as well as the reliability of the independently developed hardware and software. 

[Conclusion] The developed FF-H1 master station achieves full-chain independent control ranging from chips and protocol stacks to configuration tools, and its communication performance satisfies engineering application requirements. The results indicate that the master station can support large-scale supporting application of the Ruiwo DCS, and the work is therefore of great practical significance for improving the supply chain security of power industrial control systems and for safeguarding energy security.