168   Order of attributes in MMS components

Created: 16 Jun 2005

Status: In Force (green)

Part: Part 8-1 (2004)


Page: 32

Clause: 7.3.2

Paragraph: 2 on page 32

Issue: It is stated that the order of attributes of 7-3 should be followed as the order of MMS components. This has the following problems:
- the order is unspecified for new CDCs or extended CDCs, also from other IEC standards
- any client has to remember the order of all versions of 7-3 which exist.
- it might get in conflicts with part 6, clause 9.3.7, last paragraph, which says that the order of values within a data set should follow the order defined in the SCL file, because the order of MMS component implicitely also determines the value order of a data set.

Proposal: Change this paragraph as follows:
Within an MMS component representing IEC 61850-7-4 respective 7-3 data attributes, the order of components shall be identical to the order of these components in the ICD file of the IED.

Discussion Created Status
changed to green 13 Jan 06 In Force (green)
Change the paragraph as follows:
Within a MMS component, representing IEC 61850-7-4 DATA, the order of MMS components is determined by the order of the names of the common data classes (as defined in IEC 61850-7-3 or IEC extensions of it).
For private CDCs the order of attributes within the MMS component shall be identical to the order within the SCL ICD file describing the data model.
10 Nov 05 Ballot Period


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