A PE Entity comprises all PROFIenergy services and properties that are accessible with the same PROFIenergy service access point (PESAP). According to the Object model defined in [PE CAP], one device may have more than one PE Entity; see Figure 13 also.
However, the preferred Energy Management Object model follows the approach of independent partial models (“facets”) chosen in [OPC PN]. The reason for this is that the PESAP is not needed when accessing the energy functions of a device using OPC UA. The OPC UA Client can find out the offered Energy Management functionality by browsing the Information Model (See Figure 8 and Figure 10).
Since the PROFIenergy properties PE class and PE version are unique for each PE Entity, a PeServiceAccessPointType Object provides this information.
A remote proxy server can provide OPC UA access to the device. In order to do so, the proxy must know the PROFIenergy service access point to gain access to the PROFINET device, to find out the PROFIenergy capabilities of the device and to create the Information Model for the device. Further on, OPC UA Client accesses to PROFIenergy services are routed to the device through the service access point.