Siemens SIMATIC ET 200SP System Manual page 42

Selection criteria for the BaseUnit
The figure below shows the criteria you use to select the appropriate BaseUnit:
Form separate potential groups on the infeed bus for single-phase (L, N, PE) and three-
phase (L1, L2, L3, PE) operation.
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
4.2 Selecting motor starters with a suitable BaseUnit
Application planning
41