D685A1156U01 ABB

3HAB3409-205 Hex socket head cap screw m20x90
3HAB3409-205,3HAB3409-205
3HAB3409-23 Hex socket head cap screw
3HAB3409-23,3HAB3409-23
3HAB3409-24 Hex socket head cap screw
3HAB3409-24,3HAB3409-24
3HAB3409-25 Hex socket head cap screw
3HAB3409-25,3HAB3409-25
3HAB3409-26 Hex socket head cap screw
3HAB3409-26,3HAB3409-26
3HAB3409-27 Hex socket head cap screw

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Description

由回路控制器集成的系统,加上以CRT为基础的人机界面,其价格比由模件组成的DCS就高多了。还有一个缺点,回路控制器组成的系统一般采用MODBUS与人机界面相连,只能采用星形结构,即只有一个主站。对于电厂需要冗余操作站来说,这就是一个缺陷。所以它只适用于比较小的系统,即I/O点数比较少,且控制回路较多的被控对象中。如生产抗生素的制药厂就比较适用。另外,特别是对于一些化工企业,经常用于户外操作,它有特有的优势

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