Siemens SIMATIC ET 200SP - Page 54

Application planning
4.5 Forming potential groups
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
53
Operating principle
1
CPU/interface module
14
Server module
2
BaseUnit BU...D
15
Self-assembling voltage buses P1/P2
3
BaseUnit BU...B
16
AUX bus
4
Potential group 1
17
Infeed bus 500 V AC (L1, L2(N), L3, PE)
5
Potential group 2
18
Supply voltage L+
6
Potential group 3
19
Supply voltage L+ (3)
7
BaseUnit BU...B with dummy module
20
Additionally required voltage
8
BaseUnit BU30-MS2
21
Supply voltage L+ (2)
9
BaseUnit BU30-MS4
22
Protective conductor (green/yellow)
10
BaseUnit BU30-MS1
23
Supply voltage L+ (1)
11
Potential group 4
24
Supply voltage 1L+
12
BaseUnit BU30-MS4
13
Backplane bus
Figure 4-4 Placing the BaseUnits
Connecting different potentials to the power or 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.