Siemens Simatic S7-400 - Manual (Page 185)

Digital Modules
4-63
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Terminal Assignment and Block Diagram of the SM 422; DO 16 24 VDC/2 A
Data register and bus control
LED control
1
2
3
4
5
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8
9
11
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48
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2
0
3
1L+
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7
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1
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0
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2M
2L+
2L+
1M
3L+
3L+
2M
4L+
4L+
Process Module
1st supply group
2nd supply group
3rd supply group
4th supply group
5th supply group
6th supply group
7th supply group
8th supply group
Figure 4-15 Terminal Assignment and Block Diagram of the SM 422; DO 16 24 VDC/2 A