prEN IEC 62541-6:2024

SLOVENSKI STANDARD
01-april-2024
Enotna arhitektura OPC - 6. del: Preslikave
OPC unified architecture - Part 6: Mappings
OPC Unified Architecture - Teil 6: Protokollabbildungen
Architecture unifiée OPC - Partie 6: Mappings
Ta slovenski standard je istoveten z: prEN IEC 62541-6:2024
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

65E/1063/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62541-6 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-02-02 2024-04-26
SUPERSEDES DOCUMENTS:
65E/978/RR
IEC SC 65E : DEVICES AND INTEGRATION IN ENTERPRISE SYSTEMS
SECRETARIAT: SECRETARY:
United States of America Mr Donald (Bob) Lattimer
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
OPC Unified Architecture - Part 6: Mappings

PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

i IEC CDV 62541-6 © IEC 2023
1 CONTENTS
2 Page
4 FIGURES . iv
5 TABLES . iv
6 FOREWORD . viii
7 1. Scope . 1
8 2. Normative references . 1
9 3. Terms, definitions and abbreviated terms . 3
10 3.1. Terms and definitions . 3
11 3.2. Abbreviated terms . 4
12 4. Overview . 5
13 5. Data encoding . 6
14 5.1. General . 6
15 5.1.1. Overview . 6
16 5.1.2. Built-in Types . 6
17 5.1.3. Guid . 7
18 5.1.4. DateTime . 7
19 5.1.5. ByteString . 7
20 5.1.6. Number, Integer and UInteger . 8
21 5.1.7. Structures and Unions . 8
22 5.1.8. ExtensionObject . 8
23 5.1.9. Variant . 9
24 5.1.10. Decimal . 9
25 5.1.11. Null, Empty and Zero-Length Arrays . 10
26 5.1.12. QualifiedName, NodeId and ExpandedNodeId String Encoding . 10
27 5.1.13. Name Encoding Rules . 12
28 5.2. OPC UA Binary . 12
29 5.2.1. General . 12
30 5.2.2. Built-in Types . 13
31 5.2.3. Decimal . 21
32 5.2.4. Enumerations . 21
33 5.2.5. Arrays . 21
34 5.2.6. Structures . 22
35 5.2.7. Structures with optional fields . 25
36 5.2.8. Unions . 26
37 5.2.9. Messages . 28
38 5.3. OPC UA XML . 28
39 5.3.1. Built-in Types . 28
40 5.3.2. Decimal . 33
41 5.3.3. Enumerations . 34
42 5.3.4. Arrays . 34
43 5.3.5. Structures . 35
44 5.3.6. Structures with optional fields . 35
45 5.3.7. Unions . 35
46 5.3.8. Messages . 36
47 5.4. OPC UA JSON . 36
48 5.4.1. General . 36

IEC CDV 62541-6 © IEC 2023 ii
49 5.4.2. Built-in Types . 37
50 5.4.3. Decimal . 41
51 5.4.4. Enumerations . 41
52 5.4.5. Arrays . 42
53 5.4.6. Structures . 42
54 5.4.7. Structures with optional fields . 43
55 5.4.8. Unions . 44
56 5.4.9. Messages . 44
57 6. Message SecurityProtocols . 44
58 6.1. Certificates . 46
59 6.1.1. General . 46
60 6.1.2. Application Instance Certificate . 46
61 6.1.3. User Certificates . 47
62 6.1.4. Issuer (CA) Certificates . 48
63 6.1.5. Certificate Revocation List (CRL) . 48
64 6.1.6. Certificate Chains . 48
65 6.2. Time synchronization . 49
66 6.3. UTC and International Atomic Time (TAI) . 49
67 6.4. Issued User Identity Tokens . 49
68 6.4.1. Kerberos . 49
69 6.4.2. JSON Web Token (JWT) . 49
70 6.4.3. OAuth2 . 50
71 6.5. WS Secure Conversation. 52
72 6.6. OPC UA Secure Conversation . 52
73 6.6.1. Overview . 52
74 6.6.2. MessageChunk structure . 52
75 6.6.3. MessageChunks and error handling . 56
76 6.6.4. Establishing a SecureChannel. 57
77 6.6.5. Deriving keys . 58
78 6.6.6. Verifying Message Security . 59
79 6.7. Elliptic Curve Cryptography (ECC) . 60
80 6.7.1. Secure Channel Handshake . 60
81 6.7.2. UserIdentityToken Encryption . 64
82 6.7.3. ECC Encrypted Secret . 65
83 7. TransportProtocols . 66
84 7.1. OPC UA Connection Protocol . 66
85 7.1.1. Overview . 66
86 7.1.2. Message structure. 66
87 7.1.3. Establishing a connection . 69
88 7.1.4. Closing a connection . 71
89 7.1.5. Error handling . 71
90 7.2. OPC UA TCP . 72
91 7.3. SOAP/HTTP . 72
92 7.4. OPC UA HTTPS . 73
93 7.4.1. Overview . 73
94 7.4.2. Session-less Services . 74
95 7.4.3. XML Encoding . 74
96 7.4.4. OPC UA Binary Encoding . 75
97 7.4.5. JSON Encoding . 76

iii IEC CDV 62541-6 © IEC 2023

98 7.5. WebSockets .
...