在CPU的一个槽内安装一块合适型号的通信板，CPU就可以增加RS232C，RS422，或RS485端口
C200HX-CPU64-ZE
C200HW-NC413
C200H-DA003
C200H-CPU31
C200H-DSC01
C200H-RT002-P
C200H-ASC31
C200H-CN211
C200H-CPU21
C200H-KS01F
C200H-DA001
C200H-BC081-V2
C200H-ATTA1
C200H-ATT51
C200HW-ME16K
C200H-B7A02
C200H-BC081-V1
C200H-ME831
C200H-OD411
C200H-MD215
C200HW-ATT32
C200H-ATT83
C200HW-BI031
C200H-PID02
C200H-TV102
C200H-BP001
C200H-IM211
C200H-CPU01-E
C200HX-CPU54-E
C200H-DIN01
C200H-CN001
C200HW-PA204
C200H-OA122-E
C200HS-CPU21
C200H-OC224
C200HS-INT01
C200HW-NC213
C200HW-COM04-EV1
C200HW-COM06-V1
C200HW-ATT52
C200HW-CE001
C200H-LK201-V1
C200HW-PRT21
C200H-ID211
C200HE-CPU32-ZE
C200H-ATT53
C200H-IA121
C200HS-CPU21-E
C200H-TS001
C200HS-CPU33-E