Siemens Simatic M7-400 Reference Manual page 221

Table 5-2
Characteristics
Max. permissible common mode voltage
Special Features
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Analog Output Modules: Characteristics at a Glance
Module
SM 432; AO 8
(-1HF00-)
Between the channels and the channels
against M 3 VDC
ANA
–
Analog Modules
13 Bit
5-5