330703-000-060-10-02-00 BENTLY

3HAB9030-6 Insert type EE
3HAB9040-1 Gasket
3HAB9041-1 Cylinder guide
3HAB9042-1 Piston rod guide
3HAB9059-1 Hex socket head cap screw
3HAB9114-1 Insulation
3HAB9135-1 Ext.control panel
3HAB9135-3 Ext.control panel w. box
3HAB9139-1 Label layout

Description

专门用来读取PLC的信号。把PLC的信号送入DCS的网络是比较困难的。缺点是开发接口的费用很高。即使开发成功,接口也经常发生故障。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。

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