1041   LTS and OTS mapping

Created: 15 Mar 2013

Status: In Force (green)

Part: Part 8-1 (2011; Edition 2)

Links:

Page: 71

Clause: 15.5 and 15.6

Paragraph:

Category: Issue for edition 2 of this part

Issue

IEC 61850-7-2 Annex B includes a normative example of the control service tracking in a SCL file. The result of including this in a 61850 server will generate two MMS Named Variables, one for the LTS and one for the OTS cdc.

IEC 61850-8.1 specifies a completely different approach to combine LTS and OTS in a MMS Type definition.

It seems that the same approach that has been taken with the LOG class and LCB class (17.3.3.2), is now applied with these two service tracking CDCs.

Proposal

The specification of mapping of tracking services CDCs is not needed at all. They shall follow the same procedures as any other Common Data Class.

Only if 8.1 requires to add new structures to a data class, as in the case of the commands with the "Oper", "Cancel", "SBO", or "SBOw" this should be declared in 8.1

As a minimum, LTS and OTS mapping described in 15.5 and 15.6 should be changed to two different MMS type definitions with the attributes specified in IEC61850-7.2.