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SIEMENS S7-400 6ES74211FH200AA0 SIMATIC S7-400, DIG.INPUT MOD.,SM 421, OPTIC. ISOLATED,,16 DI, 120/230V UC,INPUTS PER IEC1131-2 TYPE 2SIMATIC S7-400, DIGITALEINGABE,SM 421, POTENTIALGETRENNT,16 DE; UC 120/230V,EINGAENGE NACH IEC1131-2 TYP 2SIMATIC S7-400,