Siemens Simatic S7-400 - Manual (Page 167)

Digital Modules
4-45
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Terminal Assignment and Block Diagram of the SM 421; DI 16 24/60 VUC
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EXTF
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Input
Diagnostics
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Input
Diagnostics
Diagnostics
Input
Diagnostics
Input
Input
Diagnostics
Input
Diagnostics
Diagnostics
Input
Diagnostics
Input
Input
Diagnostics
Input
Diagnostics
Diagnostics
Input
Diagnostics
Input
Input
Diagnostics
Input
Diagnostics
Diagnostics
Input
Diagnostics
Input
Data register and bus control
Adaptation
Process
Front connector jumper
Module
Figure 4-9 Terminal Assignment and Block Diagram of the SM 421; DI 16 24/60 VUC