Design And Implementation Of Communication Architecture Based On FPGA For Control System

In recent years, with the development of process industry, it set increasing requirements to the distributed control system(DCS), and the communication architecture of the DCS is system's data hub which have directly influence on the performance of the whole control system, so how to improve bus efficiency has become the focus of attention at all DCS manufacturers.A high efficiency communication architecture applied in distributed control system (control system inner extending bus) was proposed in this paper. Firstly the overall framework of the system was discussed, which used the highly-efficient secondary extension to made the system very flexible, used the dual-channel and parallel communication method to increase the system's transmission efficiency, and used the redundancy between the two channels to enhance the reliability of the communication.The design of the bus interface and bus protocol of the communication architecture was detailed then. The communication architecture, which was mainly consisted of FPGA, CPLD and ARM7 CPU, implemented hot swap on the target with high-speed transmission characteristics. As to the design of extensive module, micro-latency forwarding of data was implemented which improved the transparency and efficiency of the control system. As to the design of the bus protocol, a unified frame structure was adopted which simplified the system, and the protocol of link layer was formulated on the basis of the hardware advantages which increased the system's efficiency as great as possible.A series of tests of the communication architecture was implemented on the prototype ultimately, and same tests was also carried out on the some other control systems, the results show that it has high real-time performance and high reliability.