Siemens SIMATIC ET 200SP HA, System Manual

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