Abstract: Among many control systems, there are partial equipment controlled shall require remote measurement and remote control usually, but which is inconvenient to lay the cable or optical fiber (such as wiring route is blocked by hillslope, river or city building). So it appears more important to execute wireless remote measurement and remote control by PLC at this time. The system mainly is composed by an OMRON CP1H-XA40DT-D PLC, two JAMMY wireless data transmission modules, an ADVANTECH ADAM4050 and an ADVANTECH ADAM4017. CX—Programmer7.1 matched with PLC and developed by OMRON Electric Company is adopted to compile the command procedure and control procedure of water tower and filter water basin for ADVANTECH module, JAMMY sting software is adopted to set parameters for wireless data transmission module as well as InTouch configuration software of America rware Company is used to compile the equipment status of whole process flow, so as to real time monitor the parameters and human-computer control interface. The system is simple, practical, convenient and reliable, with high performance ratio, and has passed acceptance certification, its different control indexes have reached the desired requirements. The system is widely applied in railway system.
在該控制系統中,因子控制系統分散,并且采用不同廠家的設備和方案。所以要將這些子控制系統集成,并架構統一的實時監控系統。這樣的實時監控系統需要解決分散子系統間的數據共享,各子系統需要統一協調相應控制指令,再考慮到實時監控系統往往需要升級和調整,就需要各子系統具備統一的開放接口。 OPC(OLE for Process Control) 規范正是這一思維的產物。OPC規范了接口函數,不管現場設備以何種形式存在,客戶都以統一的方式去訪問,從而保證軟件對客戶的透明性,使得用戶完全從低層的開發中脫離出來。通過OPC定義的開放接口,可以實現利用PC機上的組態軟件和模塊間數據交換,從而對被控設備的遙測遙控。