Siemens SIMOCODE pro C System Manual page 143

8.6 Decoupling module (DCM) for 1st generation current/voltage measuring modules (e.g. 3UF711.1AA000)
Using the decoupling module in different networks
A decoupling module may be required when using a voltage measuring module, especially
for the following networks:
● Isolated systems
● High-impedance grounded systems
● Asymmetrically grounded systems
● Single-phase systems
SIMOCODE pro
System Manual, 05/2019, A5E40507475002A/RS-AD/004
Description of system components
143