1272   Bit mappings for options in OptFlds

Created: 10 Jun 2014

Status: In Force (green)

Part: Part 9-2 (2011; Edition 2)

Links:

Page: 18

Clause: Table 9

Paragraph:

Category: Issue for edition 2 of this part

Issue

It is ambiguous which option maps to which bit in the OptFlds BitString. For example, is bit 0 reserved or mapped to refresh-time? What is the size of the BitString?

Proposal

The mapping of the options (refresh-time, sample-synchronized, sample-rate, data-set, and security) to the bits of the OptFlds BitString as well as the size of the BitString need to be explicitly specified.

Discussion Created Status
18 Sep 15 In Force (green)
In edition 2.0 bit length is 5 (bit 0 to 4)
refresh-time - bit position 0
sample-synchronized - bit position 1
...

In edition 2.1 bit length is extended to 7 bits (bit 0 to 6).
A new table will be included in edition 2.1 to clarify the mapping of OptFlds. 		20 Aug 15 Ballot Period
Actually OptFlds is a PACKED LIST, whose value can be read over a IEC 61850-8-1 interface.
8-1 maps PACKED LIST to (8.1.3.6):
A PACKED LIST type shall be mapped to a variable length MMS Bit-string. The minimum size of the bit-string shall be determined by the number of bits required to encode the members of the PACKED LIST.

The members of the packed list in 9-2 are:
(refresh-time, sample-synchronized, sample-rate, data-set, and security)
Therefore, OptFlds is mapped to a variable length MMS Bit-string of a length = 5.

refresh-time - bit position 0
sample-synchronized - bit position 1
...

should be consisdered in Ed2.1 		10 Jun 14 Discussion (red)

 

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