Saturday, February 3, 2024

IEC 62541 (OPC Unified Architecture) - 3 Additional CDVs published for commenting

IEC TC 65E just published 3 additional Committee Drafts for Vote (CDV) for commenting and voting ... also for public comments!

CDVs for circulation on 2024-02-02 also available in Public Commenting application: (

Here are the CDV documents published (official voting period closes April 26, 2024):

IEC 62541-3 ED4: OPC Unified Architecture - Part 3: Address Space Model

IEC 62541-5 ED4: OPC Unified Architecture - Part 5: Information Model

IEC 62541-6 ED4: OPC Unified Architecture - Part 6: Mappings

See also the other 21 CDVs out for comments.

Be aware that these documents are the basis to define domain specific information models like in IEC 61850: MMXU.PhV.phsA for voltage of phase A (L1) in a three phase AC power system or MMXU.Hz for representing the frequency ... 

I guess that a lot of the definitions published in the 24 CDVs will not be implemented in all devices and only a subset of the implemented definitions may be used.

After some 40 years involved in the IEC TC 65 (1982 - 2001), TC 57 (2002 - today), IEC TC 88 (2001 - today), and ISO TC 184 SC5 WG2 (MMS, 1984 - 2000) I am increasingly convinced that IEC 61850 has a lot of advantages compared to other standards ...

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