Siemens SIMATIC S7-1200 - Page 1443

Technical specifications
A.9 Digital signal modules (SMs)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1443
Table A- 108 Wiring diagrams for the digital input SMs
SM 1221 DI 8 x 24 V DC (6ES7221-1BF32-
0XB0)
SM 1221 DI 16 x 24 V DC (6ES7221-1BH32-
0XB0)
① For sinking inputs, connect "-" to "M" (shown). For sourcing inputs, connect "+" to "M".
Table A- 109 Connector pin locations for SM 1221 DI 8 x 24 V DC (6ES7221-1BF32-0XB0)
Pin
X10
X11
1
Functional Earth
No connection
2
No connection
No connection
3
1M
2M
4
DI a.0
DI a.4
5 DI a.1 DI a.5
6
DI a.2
DI a.6
7
DI a.3
DI a.7