2020 LNodeInputRef.sourceRef reference the "input" attribute of the SourceRef, the pDA should be added

Created

19 Jan 2026

Status

TriageNew, and not yet classified. The working group decides whether to take it forward as a technical issue or to close it. Show the workflow

Part

Part 7-6 (2024)

Links

None

Page

43

Clause

6.1.7 Function Reference

Paragraph

Table 14 and Table 15

Issue

LNodeInputRef.sourceRef references only the "input" attribute of the SourceRef. However when several SourceRef element share the same "input" but have different pDA values, it is not possible to differenciate the SourceRefs.

The definition of the attribute sourceRef in LNodeInputRef, in XSD 61850-6-100 is:
"Identification of the SourceRef belonging to the current role (reference the input attribute of the SourceRef)"

But in some cases, there are several SourceRef with the same "Input" and different pDA.

In such situations, LNodeInputRef cannot distinguish between these SourceRefs, resulting in 2 identical LNodeInputRef entries in the SignalRole

Example :
<e61850-6-100:SignalRole name="Role">
<e61850-6-100:LNodeInputRef sourceRef="RREC1.Position"/>
<e61850-6-100:LNodeInputRef sourceRef="RREC1.Position"/>

Proposal

to avoid this, LNodeInputRef.sourceRef could follow the same principle as InputVar.inputName defined in IEC TR 61850-90-30 (p 92):

"If the SourceRef input is not unique, because it is associated to pDA or it is instantiated multiple time, the inputName will differentiate the correct SourceRef, by adding inputInst and pDA as following: input(inputInst).pDA"

Example :
<e61850-6-100:SignalRole name="Role">
<e61850-6-100:LNodeInputRef sourceRef="RREC1.Position(1).q"/>
<e61850-6-100:LNodeInputRef sourceRef="RREC1.Position(1).stVal"/>