Siemens SENTRON 5TT7 System Manual page 27

Wiring example
In this example, all digital inputs (DI) are wired to +24 V.
Figure 2-10
GSM alarm module
System Manual, 06/2014, 2541304131-01
Powering the digital inputs (DIs) via the Out output
Module
2.5 Configuring
27