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针对常规型电动执行机构的现场接线方式存在着布线工作量大、操作维护困难、可靠性不高、网络通信能力差等方面的问题,提出了一种基于CANopen协议的总线型电动执行机构设计方案。在简要介绍电动执行机构架构的基础上,首先给出了电动执行机构控制器的硬件设计方法,其中主要介绍了电动执行机构控制单元电路和CAN总线通讯接口电路的设计;接着给出了软件设计的思路,重点介绍了对象字典的设计及CANopen通讯程序的设计,针对通讯程序设计中的难点,提出了一种基于队列方式的报文处理模式。最后,在实际工程中成功地应用了所提出的设计方案,应用结果表明这种总线型电动执行机构具有智能化、信息化、数字化等特点,能够满足工业控制系统的网络化发展需求。
Aiming at the problems of field wiring of conventional electric actuators, such as large wiring workload, difficult operation and maintenance, low reliability and poor network communication ability, a design scheme of bus electric actuators based on CANopen protocol . Based on the brief introduction of the structure of electric actuator, the hardware design method of controller of electric actuator is given firstly. The design of control unit circuit of electric actuator and communication interface circuit of CAN bus is mainly introduced. Then the software design The article introduces the design of object dictionary and the design of CANopen communication program. In view of the difficulties in the design of communication program, a packet processing mode based on queue is proposed. Finally, the proposed design is successfully applied in the actual project. The application results show that the bus-type electric actuator has the characteristics of intelligence, informationization and digitization, which can meet the network development needs of industrial control systems.