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SIEMENS S7-400 6ES74215EH000AA0 SIMATIC S7-400, DIGITAL INPUT,SM 421, OPTIC. ISOLATED,,16 DI, 120 V AC,,WITH 1 COMMON POINTSIMATIC S7-400, DIGITALEINGABE,SM 421, POTENTIALGETRENNT,,16 DE, AC 120V,,MIT EINZELWURZELUNGSIMATIC S7-400, ENTREES TOR,SM 421, AVE