详细介绍: 74102-405-53
一个典型例子
是燃汽轮机和锅炉联合发电的电厂,燃汽轮机从美国或其它国家进口,
燃汽轮机的控制系统(PLC)和主设备一起配成,而锅炉的控
?
15?
制
系统由用户自己选配,用户很想把两者的信息在一个操作站上显示。为
开发这个操作站,开发费用在几万美金以上。即使开发成功,也经常发
生故障。?
??对于PLC来说,70年代中期曾经开发过专用操作站,但
不太成功。
74102-405-53
联系人:郭先生 联系电话:18971415643 座机:027-83238871 传真:207-61537051 QQ:810334512
早期DCS和PLC的互连是采用把PLC作为DCS的一个输入板,DCS
专们设计一块与PLC的接口板,与DCS的本身的I/O板连在同一条I/O总线
上。控制器读入PLC来的信号,通过DCS的网络把PLC的信号送到DCS操作
站上。这样互连的办法有一个大的缺点是:PLC的快速信号在慢速反应的
DCS的操作站上显示。经测定,一个微动开关的动作要经过几秒以上的时
间才能在DCS的操作站上表现出来。
74102-405-53
 
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