Digital modules
3.10 Digital input module SM 321; DI 16 x 24 VDC; with hardware and diagnostic interrupts (6ES7321-7BH01-
0AB0)
S7-300 Automation System Module data
3-22 Manual, 08/2006, A5E00105505-04
Wiring and block diagrams of SM 321; DI 16 x DC 24 V
6)
9
V
9
V
9
V
9
V
/
/
/
9
0
0
① Channel number
② Status displays - green
Error displays - red
Encoder supply V
S
-green
③ Backplane bus interface
④ Wire-break detection
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