Siemens Simatic S7-400 - Manual (Page 539)

Interface Submodules
13-43
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Connecting Loads to the Voltage Output
The following figure shows the wiring of two channels as an example.
+24 V
R
L1
L
+
QV
1
S
1
Ground bus
QV
0
S
0
R
L2
M
0 V V
CM1
V
CM0
Figure 13-21 Connecting Loads/Actuators via a Three-Wire Connection to a Voltage Output