1128 Value of LLN0.GrRef
- Created
- 28 May 2013
- Status
- In Force (green)Closed: the solution is part of the standard. No further comments are taken. Show the workflow
- Part
- Part 7-4 (2010; Edition 2)
- Links
- None
- Page
- 24
- Clause
- 5.3.4
- Paragraph
- Category
- No impact on this part
Issue
Data object GrRef in LLN0 is defined as an ORG and is a "Reference to a higher level logical device".
So is the value the parent logical device instance (in SCL - online it shall be the logical device name, i.e., the "explicit" LDevice.ldName when defined, otherwise IED.name + LD.inst) with or without LLN0?
Example: "LD0" or "LD0/LLN0"?
There are currently SCL files with both solutions, and we should have only one way of doing things.
Proposal
| Discussion | Created |
|---|---|
| In Force (green) Change to Ntp (No impact to this part). This is agreed (green). | 11 Dec 13 |
| Not Applicable No changes in 7-4. Set to blue. | 18 Oct 13 |
|
Discussion (red)
I agree with Wolfgang analysis.
Since - the value of the GrRef.setSrcRef attribute is the reference of a logical device, - and the reference of the logical device is the logical device name (see 7-2 GetServerDirectory(LOGICAL-DEVICE) response) the final proposal should be - setSrcRef content is the logical device name and not the reference of the LLN0 of the logical device. |
06 Sep 13 |
| Discussion (red) According to 7-2 chapter 22.2 the LD is referenced by the LD name; this is in the discussed example "@LD0" as relative name respective something like "E1Q1F1LD0" as full instance name. Thus the 7-1 example is in full line with the 7-2 definition. | 05 Sep 13 |
|
Discussion (red)
Even if the logical references LD0 and LD0/LLN0 are semantically equivalent (because of 1:1 relation between LD0 and LLN0), syntactically and meta-model-wise they are not: The former is a logical device, the latter is the LN0 within the logical device. The modelling for LD and for LN is very different.
By the way: Why is this a 7-4 Tissue? This is a Tissue for -7-2 or -6 (because it's about instance references), not about the LN type system or DOs, so not really for -7-4. Or, do we need to specify what the "Reference to a higher level logical device" looks like here, in the doc for GrRef? I don't think so; it should be defined in the "father of the meta-model", -7-2, and then if necessary taken over by -6 and anybody else who needs it. |
14 Aug 13 |
| Discussion (red) The examples in 7-1 show that it is only the LD name, i.e. in above example the SCL value would be @LD0 and NOT @LD0/LLN0. The online readable value will then be the full LDName (e.g. E1Q2F1LD0) | 28 May 13 |