Siemens SIMATIC ET 200SP System Manual page 34

Application planning
3.3 Forming potential groups
Operating principle
①
②
③
④
⑤
⑥
⑦
⑧
Figure 3-3
Connecting different potentials to the AUX bus
Note
If you apply different potentials to the power or AUX bus within an ET 200SP station, you
need to separate the potential groups with a BaseUnit BU...D.
34
CPU/interface module
BaseUnit BU...D
BaseUnit BU...B
Potential group 1
Potential group 2
Potential group 3
Backplane bus
Server module
Placing the BaseUnits
⑨
Self-assembling voltage buses P1/P2
⑩
AUX bus
⑪
Supply voltage L+ (3)
⑫
Additionally required voltage
⑬
Supply voltage L+ (2)
⑭
Protective conductor
⑮
Supply voltage L+ (1)
⑯
Supply voltage 1L+
System Manual, 12/2015, A5E03576849-AF
Distributed I/O system