Siemens Simatic S7-400 - Manual (Page 214)

Digital Modules
4-92
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Terminal Assignment and Block Diagram of the SM 422;
DO 16
30/230 VUC/Rel. 5 A
Data register and bus control
LED control
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Process Module
Figure 4-22 Terminal Assignment and Block Diagram of the SM 422; DO 16 30/230 VUC/Rel. 5 A