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EM231-RTD4 Compatible SIEMENS  S7-200 6ES7231-7PC22-0XA06ES7 231-7PC22-0XA0  PLC Module 4 RTD input  Fully compatible with Siemens S7-200 and S7-300 series PLC, STEP 7-MICRO/WIN software programming can be used...

EM231-TC4 Compatible SIEMENS  S7-200 6ES7231-7PD22-0XA06ES7 231-7PD22-0XA0  PLC Module 4 Thermocouple Input  Fully compatible with Siemens S7-200 and S7-300 series PLC STEP 7-MICRO/WIN software programming can...

EM232-DA2 Compatible SIEMENS  S7-200 6ES7232-0HB22-0XA06ES7 232-0HB22-0XA0  PLC Module 2 AO  Fully compatible with Siemens S7-200 and S7-300 series PLC STEP 7-MICRO/WIN software programming can be used directly...