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6ES7421-7BH00-0AB0 Price as of: 242,10 EUR, SIEMENS 6ES7 421-7BH00-0AB0 SIEMENS SIMATIC S7-400, DIG.INPUT MOD. SM 421, OPTIC. ISOLATED 16 DI, 24V DC WITH 0,1 MS INPUT DELAY ALARM, DIAGNOSTICS ( 6ES74217BH000AB0 6ES7 4217BH000AB0 )