Siemens SIMATIC S7 Equipment Manual page 50

Appendix
A.2 Plug Connector Allocation
Connection
sensors 1 and 3
13
25
14
1
A-4
Plug connector X1
Sub D plug connector, 25-way socket
Pin
1 -15 V voltage supply (with fuse/floating)
2 Reference potential, voltage supply
3 +15 V voltage supply (with fuse/floating)
4 -
5 Sensor 1: STOP input (RS 422)
6 Sensor 1: START output (RS 422)
7 -
8 Sensor 3: STOP input (RS 422)
9 Sensor 3: START output (RS 422)
10 -
11 -
12 Reference potential, voltage supply
13 +24 V auxiliary voltage (with fuse/floating)
14 -15 V voltage supply (with fuse/floating)
15 Reference potential, voltage supply
16 +15 V voltage supply (with fuse/floating)
17 -
18 Sensor 1: STOP input (RS 422)
19 Sensor 1: START output (RS 422)
20 -
21 Sensor 3: STOP input (RS 422)
22 Sensor 3: START output (RS 422)
23 -
24 Reference potential, voltage supply
25 +24 V auxiliary voltage (with fuse/floating)
Function
SM 338 Equipment Manual
(4) J31069-D401-U1-A0-7618