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SIMATIC S7-400, digital input SM 421, isolated 16 DI; 24 V DC with 0.05 ms input delay alarm, diagnostics
6ES7421-1BL01-0AA0 Siemens S7-400, SM 421 DIGITAL INPUT MODULE
Digital Output Module OPTIC. ISOLATED, 32 DO, 24V DC, 0.5A
CPU 417-5H, CENTRAL UNIT FOR S7-400H AND S7-400F/FH, 5 INTERFACES
CPU 417H CENTRAL UNIT FOR S7-400H 4 INTERFACES