Besides the IM 650, the PS 307 also supplies the load circuit for the 24 V DC modules.
Note: The arrangement of the supply connections shown does not correspond to the actual
arrangement; it was chosen to give you a clear overview.
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Figure 2-6 Operating ET 200PA SMART modules or S7‑300 modules from PS 307
2.3.3 Configuration of the ET 200PA SMART with ungrounded reference potential
In the configuration of the ET 200PA SMART with ungrounded reference potential, the
occurring interference currents are discharged to the protective conductor via an RC network
that is integrated in the IM 650 (see following figure).
Application
In extensive plants, it may be necessary, e.g. for purposes of ground fault monitoring, to
configure the ET 200PA SMART with ungrounded reference potential. This is the case, for
example, in the chemical industry or in power stations.
Assignment planning
2.3 Configuring the electrical structure
ET 200PA SMART
Operating Instructions, 06/2019, A5E34192013-AB 27
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