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SIMATIC S7-400, digital output SM 422
SIMATIC S7-400, digital output SM 422, isolated 16 DO; 24 V DC, 2 A
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