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SIEMENS S7-300 6ES73217BH000AB0 SIMATIC S7-300, DIGITAL INPUT,SM 321, OPTICALLY ISOLATED,,16 DI, DC 24V, 20 PIN,,PROCESS INTERRUPT, DIAGNOSTICSSIMATIC S7-300, DIGITALEINGABE,SM 321, POTENTIALGETRENNT,,16 DE; DC 24V, 20-POLIG,,PROZESSALARM, DIAGNOSESIMATIC