1756-BATM
1756-BATM
2.1 DCS或TDCS
(1)分散控制系统DCS与集散控制系统是集通讯、计算、控制、显示4C(Communication,Computer,Control,CRT)技术于一身的监控技术。
(2) 从上到下的树状拓扑大系统,其中通信(Communication)是关键。
(3) PID在中继站中,中继站联接计算机与现场仪器仪表与控制装置。
(4) 模拟信号A/D-D/A带微处理的混合。
(5) 一台仪表一对线接到I/O,由控制站挂到局域网LAN。
(6) DCS是控制(工程师站)、操作(操作员站)、现场仪表(现场控制站)的三级结构。
(7) 缺点是成本高,各公司产品不能互换,不能互操作,大DCS系统是各家不同的。
(8) 用于大规模的连续过程控制,如石化等。
(9) 制造商:Bailey(美)、Westinghouse(美)、HITACH(日)、LEEDS&NORTHRMP(美)、Siemens(德)、Foxboro(美)、ABB(瑞士)
现货,现货,降降降,火火火,火火火……
现货,现货,降降降,火火火,火火火……
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◆ 联系人: 小廖(女士)
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