DCS与PLC的区别和共通(国外英语资料).docVIP

DCS与PLC的区别和共通(国外英语资料)DCS is a distributed control system, is a system, rather than a specific device, communication between devices is one of their own making, using the advantages of large international companies to develop their own OEM products, is closed, to be replaced, only to find them to be extended. There has been no climate that has been superseded by fieldbus.PLC refers to a control device,The differences and similarities between DCS and PLC [585]Control products are numerous and various. The commonly used control products include DCS, PLC, and two major categories. We extended the concept of DCS to FCS.DCS (Distributed Contorl System), distributed control system, also called distributed control system.PLC (Program, Logic, Control) programmable logic controller.FCS (FieldBus, Contorl, Syestem) field bus control systemUntil now, there is no strict boundary between DCS and PLC. For most people, the big system is DCS, and the small system is called PLC. Of course, it is not impossible to say so, but it is not right. Now lets re-establish this idea.Well, first of all, whats the difference between DCS and PLC?1, in terms of development:DCS evolved from the traditional dashboard monitoring system. Therefore, control of DCS from congenital it lays more emphasis on the instrument, such as the YOKOGAWA CS3000 DCS system we use or no limit to the number of PID (PID, PID algorithm is the control valve, number of standard algorithm, the PID inverter closed-loop control usually determines the number of adjustable valve).PLC evolved from traditional relay loops, and the initial PLC did not even have the analog processing capability, so PLC started by emphasizing logical computing capabilities.2, from the aspects of system scalability and compatibility:Market control products are numerous, regardless of DCS or PLC, there are many manufacturers in the production and sale. For PLC systems, there is generally no or very little need for extensions, because PLC systems are g