分散型控制系统与子系统的通讯连接(Ⅰ)

The Communication Connection Between DCS and Subsystem (Ⅰ)

由于工业控制系统中的通讯关联着它所控制的大型设备的安全，对它的可靠性、合理性有很高的要求。还由于工业控制系统中的通讯与计算机通讯不大一样，牵扯到许多不同类型的现场信号，再加上工业控制系统对可靠性的高要求，因此工业控制系统中常使用专用通讯协议。现介绍ＤＣＳ系统中主系统与子系统的通讯问题———ＤＣＳ串行接口的通讯界面、通讯方式、ＭＯＤＢＵＳ通讯协议等。并进一步以横河电机串行接口为例对具体细节作了详细地介绍。最后列举了横河电机ＣＥＮＴＵＭＣＳ与美国通用电器公司的ＭＡＲＫＶ的通讯实例以供参考。

Because the communication in industry control system relates the safety of large equipment that it controlled,higher requirement for its reliability and rationality is necessary.Because the communication in industry control is different from the one in common computer and involved with many different type of field signal,industry control system requires higher reliability,it often adopts special communication agreement .Now the communication between main system and subsystem in DCS-communication interface of DCS serial ports,communication methods,MODBUS communication agreement etc.is introduced.And communication between YOKOGAWA CENTUM CS and GE MARK V is introduced detail as an example for reference.