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。
HP Compaq AlphaServer ES40 667MHz CPU Board 54-30362-01
One-day shipping available
Compaq 2MB Cache AS4100 5-300 CPU Board B3002-AB
FANUC A16B-1211-0860/04A CPU BOARD *
FANUC A16B-1210-0020/09E AXIS CPU BOARD *
FANUC A16B-1211-0040/07A CPU BOARD *
FANUC A16B-2200-0200/03A MAIN CPU BOARD *
FANUC A16B-1211-0030/03A CPU BOARD *
CASI RUSCO 100124001 MICRO 5 PXN CPU BOARD
Sun 501-2668 S1000e Cpu Board Sparcse
One-day shipping available
Alpha Server ES40 667MHz CPU board 54-30362-01
Intel T440 BX Nightlight serve single cpu board
