Siemens Simatic S7-400

Wiring and block diagram of the SM 421; DI 16 x UC 120/230 V
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4 N
3 N
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1N
2N
Process Module
Data register and bus control
Figure 4-8 Wiring and block diagram of the SM 421; DI 16 x UC 120/230 V
Specifications of the SM 421; DI 16 x UC 120/230 V
Dimensions and weight
Dimensions W x H x D (mm) 25 x 290 x 210
Weight Approx. 650 g
Module-specific data
Number of inputs 16
Digital modules
4.11 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7 421-1FH00-0AA0)
S7-400 Automation System Module Data
120 Reference Manual, Ausgabe 11/2016, A5E00850736-08