168   Order of attributes in MMS components

Created: 16 Jun 2005

Status: In Force (green)

Part: Part 8-1 (2004)

Links:

Page: 32

Clause: 7.3.2

Paragraph: 2 on page 32

Category: Issue for edition 2 of this part

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.