Siemens Simantic ET200SP - Page 46

Application planning
3.4 Forming potential groups
Distributed I/O system
46 System Manual, 12/2016, A5E03576849-AG
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
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 3-3 Placing the BaseUnits
Connecting different potentials to the AUX bus
Note
If you apply differen
t potentials to the power or AUX bus within an ET 200SP station, you
need to separate the potential groups with a BaseUnit BU...D.