双系统冗余热备EtherCAT主站的设计与实验OACSTPCD

EtherCAT bus technology has been widely used in the field of industrial control with the advantages of low cost and high per-formance.In view of the current EtherCAT master products generally can not meet the cable redundancy and hot backup operation at the same time,a dual system redundant hot backup master scheme was designed.The host module is responsible for controlling the slave devices in the network,and the redundant control module not only monitors the host module and arbitrates its active/standby state,but also controls the activated host module to access the network through its internal network interface switching components.The host module is based on the Loongson microprocessor design,and the redundancy control module is based on the ST Microcontroller design.The selected main software such as real-time operating system(SylixOS,RT-Thread)and protocol stack(SOME,libmodbus)are open source products.Finally,the designed master equipment is tested and verified,and the results show that the master has complete function and excellent performance,not only retains the cable redundancy mechanism,but also realizes the dual system redundant hot backup operation,and can complete the system switch in milliseconds after the activation system failure,and the reliability meets the requirements of the master station controller in most industrial control application scenarios.