基于PLC单向导通装置智能监控系统的技术研究

Technology Research of Intelligent Monitoring and Control System Based on PLC Unilateral Connecting Device

单向导通装置是城市轨道交通地铁系统中防止杂散电流扩散的重要组成部分,同时也属于地铁杂散电流防护系统中重要的一环。设计研究了一种基于西门子Smart 200 PLC单向导通装置的智能监控系统,可实现电流、电压数据采集、二极管、隔离开关、消弧装置状态信号采集,对智能消弧装置和电动隔离开关进行自动控制。该系统还具有远程通信功能,通信协议采用开放的标准规约Modbus-TCP,也支持MODBUS-RTU协议通讯。通信接口使用光纤以太网方式,完全满足与变电所自动化PSCADA系统通讯。

Unilateral connecting device is an important part of preventing stray current diffusion in metro system of urban rail transit.Meanwhile,it is an important part of subway stray current protection system.In this paper,an intelligent monitoring control based on Siemens SMART 200 PLC Unilateral connecting device is designed and studied,The system can realize current and voltage data acquisition,diode,isolating switch,arc suppression device state signal acquisition,automatic control of intelligent arc suppression device and electric isolating switch.It also has the function of long-distance communication.The communication protocol adopts the open standard protocol Modbus-TCP,and also supports the communication of Modbus-RTU protocol,The optical fiber Ethernet is used as the communication interface,which can fully communicate with the automatic PSCADA system of the substation.