Siemens SIMATIC ET 200SP HA System Manual page 84

Wiring
6.3 Operation of the IO device on a grounded power supply
Power supply and grounding concept in the overall configuration
The following figure shows the IO device based on the ET 200SP HA distributed I/O system in
its overall configuration (supply voltage and ground concept) when supplied from a TN‑S
network.
①
Main switch / disconnector
②
Power supply (galvanic isolation)
③
Short-circuit / overload protection
Figure 6-4 ET 200SP HA in its overall configuration
See also
Power supply (SELV/PELV) (Page 148)
84
ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD