SIMATIC S7-400. SM 421 DIGITAL INPUT MODULE. OPTIC. ISOLATED. 32 DI. 24V DC
SIMATIC S7-400. SM 421 DIGITAL INPUT MODULE. OPTIC. ISOLATED. 16 DI. 24 - 60V UC. ALARM. DIAGNOSTICS
SIMATIC S7-400. DIGITAL INPUT SM 421. GALVANICALLY ISOLATED. 16 DI. 24V DC WITH 0.05 MS INPUT DELAY. ALARM. DIAGNOSTICS
SIMATIC S7-400. DIG.INPUT MOD. SM 421. OPTIC. ISOLATED. 16 DI. 120/230V UC INPUTS PER IEC1131-2 TYPE 2