Siemens SIMATIC S7-1500 Manual page 15

Pin assignment for the power supply element
The power supply element is plugged onto the front connector for powering the analog
module. Wire the supply voltage to terminals 41 (L+) and 44 (M). You can use terminals 42
(L+) and 43 (M) to loop the potential to the next module.
Figure 3-1
Analog input module AI 8xU/I/RTD/TC ST (6ES7531-7KF00-0AB0)
Manual, 09/2016, A5E03484864-AD
Power supply element wiring
Wiring
15