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
C200HW-ME64K
C200H-OC222
C200H-OD212
C200H-OC222N
C200H-ID219
C200H-IM211
C200H-IDS01-V1
C200H-CP114
C200HX-CPU34-ZE
C200H-OA223
C200HS-INT01
C200H-CN311
C200H-CN425
C200H-PS221
C200H-TS102
C200H-BC051-V2
C200H-OD501
C200H-IP007
C200H-ASC02
C200H-ATT02
C200HW-MC402-E
C200H-ATTA1
C200HX-CPU65-E
C200H-OC221
C200H-CN422
C200H-TS001
C200H-CN002
C200H-RT001-P
C200H-KS01F
C200HW-PA209R
C200H-SP001
C200HW-BC081
C200HX-CPU64-ZE
C200HW-PRM21
C200H-B7AO1
C200H-DA002
C200H-BC081-V2
C200HW-CORT21-K
C200H-CPU31
C200H-IA221
C200H-ASC11
C200H-IM212
C200H-CN111
C200HG-CPU33-ZE
C200H-CT021
C200HW-PA204
C200H-ME431
C200H-CT001-V1
C200HG-CPU63-E
C200H-BP001