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Siemens Simatic S7-400 User Manual

Page 143

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Digital Modules

4-21

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Terminal Assignment and Block Diagram of the SM 421; DI 32

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Data register and bus control

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Figure 4-3

Terminal Assignment and Block Diagram of the SM 421; DI 32

24 VDC

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