Siemens Simatic S7-400 - Manual (Page 193)

Digital Modules
4-71
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Terminal Assignment and Block Diagram of the SM 422; DO 32 24 VDC/0.5 A
L+
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1L+
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M
Data register and bus control
LED control
Process Module
Figure 4-17 Terminal Assignment and Block Diagram of the SM 422; DO 32 24 VDC/0.5 A