====== IEC 62541-006 OPC Unified Architecture - Part 6: Mappings ======
[[dido:public:ra:xapend:xapend.b_stds:tech:iec:start| return to the IEC Standards ]]

<table>
<caption>Data sheet for OPC Unified Architecture - Part 6: Mappings</caption>
| Title                      | OPC Unified Architecture - Part 6: Mappings |
| Version                    | 2020|
| Document Number            | 62541-6|
| Release Date               | OPC Unified Architecture - Part 6: Mappings  |
| Reference                  | [[https://webstore.iec.ch/publication/61115]] |
</table>

  : **Note**: The following is an excerpt from the official IEC catalog. It is provided here as a convenience and is not authoritative. Refer to the original document as the authoritative reference.

===== Abstract =====

IEC 62541-6:2020 specifies the OPC Unified Architecture (OPC UA) mapping between the security model described in [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-2]], the abstract service definitions specified in [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-4]], the data structures defined in [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-5]] and the physical network protocols that can be used to implement the OPC UA specification. This third edition cancels and replaces the second edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:

  : a) Encodings:
    * added JSON encoding for PubSub (non-reversible);
    * added JSON encoding for Client/Server (reversible);
    * added support for optional fields in structures;
    * added support for Unions.
  : b) Transport mappings:
    * added **''WebSocket secure connection – WSS''**;
    * added support for reverse connectivity;
    * added support for session-less service invocation in HTTPS.
  : c) Deprecated Transport (missing support on most platforms):
    * SOAP/HTTP with **''WS-SecureConversation''** (all encodings).
  : d) Added mapping for JSON Web Token.
  : e) Added support for Unions to NodeSet Schema.
  : f) Added batch operations to add/delete nodes to/from NodeSet Schema.
  : g) Added support for multi-dimensional arrays outside of Variants.
  : h) Added binary representation for Decimal data types.
  : i) Added mapping for an OAuth2 Authorization Framework.

See also:

  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-1]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-2]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-3]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-4]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-5]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-7]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-8]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-9]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-10]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-11]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-12]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-13]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-14]]
  * [[dido:public:ra:xapend:xapend.b_stds:tech:iec:62541-100]]
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