描述
控制器是DCS的核心部件，它相当于一台PC机。有的DCS的控制器本身就是PC机。它主要有CPU、RAM、E2PROM和ROM等芯片，还有两个接口，一个向下接收I/O总线来的信号，另一个接口是向上把信号送到网络上与人机界面相连。ROM用来存贮完成各种运算功能的控制算法（有的DCS称为功能块库）。
Nash SC3 Vacuum pump and system
Pfeiffer TPH 330 Turbo Vacuum Pump, Balzers: Rebuilt
Rebuilt with a Six Month Warranty
Leybold TMP 340M Vacuum Turbo Pump MAG 340M REBUILT
One-day shipping available
New BOC Edwards E2M18 Rotary Vane Wet Pump
Kashiyama HC 60B Dry Vacuum Pump: Tested Good
Becker DVT2.140 Vacuum Pump DVT 2.140 DVT-2.14 rebuilt
