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介绍了以Siemens S7-300PLC为控制核心的HL-2A装置电子回旋共振加热控制与保护系统的设计与实现。系统采用了基于工业以太网的分布式结构，使用VFC/FVC电路和光纤隔离技术传输高电压/大电流的测量与控制信号，确保了控制系统运行的电气安全性，增强了信号传输过程中的抗干扰能力；加热系统的保护采用基于CPLD/FPGA实现的快速保护技术。实验证明该控制与保护系统具有兼容装置现场强电磁干扰的能力，运行稳定可靠、功能完善并具有良好的扩充性能。

Control and protection system based PLC for the ECRH system on the HL-2A tokamak

The design and implementation of the control and protection system which was build up around the SIEMENS S7-300 PLC in the ECRH system on the HL-2A tokamak is introduced. The system uses the distributed architecture based on industrial Ethernet. And the system also uses fiber isolation technology to transmit high voltage/high current measurement and control signals in order to ensure the security and the stability of the system, while enhancing the anti-jamming capability of the signals during the transmission process. The heating protection system adopted the fast protection technology based on CPLD/FPGA. It has proved that the control and protection system is stable, reliable and compatible with the strong electromagnetic interference on the HL-2A. The whole system is also fully functional and has a good scalable performance.