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SIEMENS S7-400 6ES74211FH000AA0 SIMATIC S7-400, SM 421,DIGITAL INPUT MODULE,,OPTIC. ISOLATED, 16 DI,,120/230V ACSIMATIC S7-400, DIGITALEINGABE,SM 421, POTENTIALGETRENNT,16 DE; AC 120/230VSIMATIC S7-400, ENTREES TOR,SM 421, AVEC SEP. GALVANIQUE,16 E TOR, 1