Potential Relationships In The Io Device - Siemens SIMATIC ET 200SP HA System Manual

4.4

Potential relationships in the IO device

The following potential relationships apply in the IO device based on the ET 200SP HA
distributed IO system:
● Same potential:
– The same potential only exists for the supply voltages of I/O modules of one potential
● There is electrical isolation between:
– The power circuits of the supply voltage / process signals and all other circuit elements
– The communication interfaces of the interface module (PROFINET) and all other circuit
ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD
group.
You can find information on this in the section "Forming potential groups (Page 34)".
of the IO device.
elements of the IO device.
4.4 Potential relationships in the IO device
Plant planning
27