描述
所有模块都固定在底板上。如德维森公司的PPC11、PPC22和PPC31系列PLC，OMRON公司的C200Ha机，CV2000等中、大型机就是这种结构。它比较牢固，但底板的槽数是固定的，如3、5、8、10槽等等。槽数与实际的模块数不一定相等，配置时难免有空槽。这既浪费，又多占空间，还得占空单元把多余的槽作填补。
Accu-Rate 100KG Dry Material Feeder Scale Base S39
Allen Bradley 1771-AF1 Ser. B Fiber Optic Converter S2
Burgmann MR333S1-D/75-A3 Mechanical Seal S37
Mettler Toledo InPro 6800 Series O2 Sensor NEW S22
Yokogawa DR240 Darwin Hybrid Chart Recorder S26
Yokogawa DR230 Darwin Hybrid Chart Recorder S26
1″ 150# Micro Motion DS100S128SU Mass Flow Sensor #2
Rosemount No.1055 Solu Comp II Conductivity Analyzer S4
1-1/2″ AVCO Sanitary SS Actuated Ball Valve #1 S21
Foxboro 875CR Intelligent Electrochemical Analyzer S2
Honeywell DR450R-2200 Chart Recorder W/RH Sensor S26
1-1/2″ AVCO Sanitary SS Actuated Ball Valve S31
3″ 150lb Carbon Steel American BOA Inc. Expansion Joint
