为适应目前工业控制系统网络化的发展,降低控制系统成本,建立了一种摩擦焊机网络控制系统,并进行串口通信实时性和稳定性的研究.主控制站采用工业控制计算机机(IPC),从控制站采用三菱FX系列可编程控制器(PLC),计算机闭环控制过程中的开关量信号通过串口通信在两站间实时传送.测试结果表明:网络性能与串口通信程序的优化程度、PLC性能和通信速率密切相关.若采用FX3U PLC,通信速率115.2kbps,通信过程约在5.8 ms完成.现场应用表明,采用此网络控制系统,摩擦焊机系统的运行速度高、投资小、系统运行稳定可靠.%To accommodate the developing of the networked industrial control system,and to reduce the cost of hardware of the control system,networked control system of friction welding machine was set up,then real-time and stability of serial port communication was researched.The main control station is the industrial control computer,and the subordinate control station is Mitsubish FX ProgrammablernLogic Controller.The digitalsignals in the process of computer closed-loop control system are transmitted through serial communicationrnbetween two stations in real-time.Data statistical analysis showed that networked performance is closely related with optimizationrndegree of serial port communication program,PLC performance and communication ratn.The communication process can be completed in 5.8 milliseconds using FX3U PLC and 115.2 kbps communication rata.The actual production showed that using networked control system,the friction welding system has high running speed,small investment,running tably and reliably.
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