Siemens ET 200S Manual page 52

Configuration Options
AUX(iliary) Bus (AUX 1)
A TM-P terminal module (for a power module) allows you to connect additional
potential (up to the maximum rated load voltage of the module), which you can
apply by means of the AUX(iliary) bus. You can set the AUX(iliary) bus individually
as:
S A protective ground bar
S Additionally required voltage
Placement and Connection to Common Potential of Power Modules
P1/ P2 power buses
AUX1 bus
Supply voltage 1
Protective conductor
Figure 3-1 Placement and Connection to Common Potential of Power Modules
Warning
!
If you connect the AUX1 bus to common potential independently of the P1/P2
buses (different voltages), there is no safe electrical isolation between the AUX1
bus and the P1/P2 buses.
3-4
Potential group 1 Potential group 2
Supply voltage 2
Additionally re-
quired voltage
Potential group 3
Supply voltage 3
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07