西门子PLC及其模块,西门子S7-200CN SIMATIC S7-300 S7-400 S7-1200 ET200,西门子S7-200CN CPU-CPU226CN CPU224XPCN  CPU224CN  CPU222CN CPU221 西门子S7-200CN 功能扩展模块：EM221CN  EM222CN  EM223CN  EM231CN  EM232CN  EM235CN  EM253 EM227 CP243-1  西门子S7-1200：CPU1215C CPU1214C CPU1212C CPU1211C SM1223 SM1222 SM1221 SM1332 SM1231 SM1232 SM1234  CM1241 CSM1277 PM1207 SIM1274