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SIEMENS S7-400 6ES74211BL000AA0 SIMATIC S7-400, SM 421,DIGITAL INPUT MODULE,,OPTIC. ISOLATED, 32 DI, 24V DCSIMATIC S7-400, DIGITALEINGABE,SM 421, POTENTIALGETRENNT,32 DE; DC 24VSIMATIC S7-400, ENTREES TOR,SM 421, AVEC SEP. GALVANIQUE,32 E TOR, 24V DCSIMAT