6ES7421-7DH00-0AB0
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SM421 DIGITAL INPUT 16 DI; 24 - 60V UC
SIMATIC S7-400, SM 421 DIGITAL INPUT MODULE, OPTIC. ISOLATED, 16 DI, 24 - 60V UC, ALARM, DIAGNOSTICS
SM421 DIGITAL INPUT 16 DI; 24 - 60V UC
SIMATIC S7-400, SM 421 DIGITAL INPUT MODULE, OPTIC. ISOLATED, 16 DI, 24 - 60V UC, ALARM, DIAGNOSTICS