1558   Ambiguous object references

Created: 21 Sep 2016

Status: Not Applicable

Part: Part 7-2 (2010; Edition 2)


Page: 183

Clause: 22.2


Category: No impact on this part


What means reference E1QA5/XSWI.Pos.stVal if LDevice E1QA5 contains two switches: XSWI1 and XSWI2 (two or more instances).


Discussion Created Status
it is a wrong reference. An IED (LD) related reference always shall contain the LN instance number, even if only one instance of the LN class exists.(exception: LLN0, which has no instance number).
In contrast function related names shall NOT contain the LN instance number. In this case the structure of the Substation / Process hierarchy referencing the LN shall assure name uniqueness.
22 Sep 16 Not Applicable


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