Siemens SIMATIC S7-400 Reference Manual page 166

Analog modules
5.2 Module overview
Substitute value output
Voltage relationships
Maximum permitted common mode voltage
Special features
166
Properties Module
SM 432; AO 8 x 13 bit
(-1HF00-)
No
Analog section isolated from:
● the CPU
● the load voltage
Between channels or between channels and M
3 V DC
-
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
ANA