
Digital modules
4.7 Digital input module SM 421; DI 32 x DC 24 V (6ES7421-1BL01-0AA0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
107
Wiring and block diagram of the SM 421; DI 32 x DC 24 V
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Process Module
Data register and bus control
Figure 4-2 Wiring and block diagram of the SM 421; DI 32 x DC 24 V
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