Siemens S5-100U - Non-Floating and Floating Configurations

S5-100U Installation Guidelines
3.3.3 Non-Floating and Floating Configurations
The S5-100U is powered by its own control circuit. The I/Os are powered by the load circuit.
The circuits can either be connected to the same grounding point (non-floating) or galvanically
isolated (floating).
Example of a Non-Floating Connection of Digital Modules
A 24 V DC load circuit has the same chassis grounding as the control circuit of the S5-100U.
Figure 3-21. Example: Non-Floating Connection of I/Os to the S5-100U
Load power
supply
Common
chassis ground
Central
grounding point
CPU
L+M
L+
M
PS
EWA 4NEB 812 6120-02 3-25