BS EN IEC 62541-11:2020

What is BS EN IEC 62541‑11 about? 

BS EN IEC 62541‑11 is the 11th part of a multi-series standard. BS EN IEC 62541‑11 deals with historical access for OPC unified architecture. 

BS EN IEC 62541‑11 defines the information model associated with historical access (HA) which includes additional and complementary descriptions of the NodeClasses and attributes needed for historical access, additional standard properties, and other information and behaviour. 

BS EN IEC 62541‑11 includes functionality to compute and return aggregates like minimum, maximum, average etc. The information model and the concrete working of aggregates are defined in IEC 62541-13. 

Who is BS EN IEC 62541‑11 for? 

BS EN IEC 62541‑11 on historical access for OPC unified architecture is applicable to: 

• Organizations shifting to service-oriented architecture 
• Software development teams 
• Cybersecurity teams 

Why should you use BS EN IEC 62541‑11? 

OPC unified architecture is an interoperability standard for transferring data securely and reliably in industrial automation and other industries. It is a platform-independent, service-oriented architecture that ensures a smooth flow of data across devices from various manufacturers. 

BS EN IEC 62541‑11 provides you with extensive information on the historical information model, data nodes, event nodes, supported functions and capabilities, audit events, specific usage of services, continuation points, parameters that allow you to securely archive historical data for OPC unified architecture. 

What’s changed since the last update? 

BS EN IEC 62541‑11:2020 supersedes BS EN 62541‑11:2015, which is now withdrawn. 

Changes in BS EN IEC 62541‑11:2020 include: 

• A new method for determining the first historical point has been added 
• Added clarifications on how to add, insert, modify, and delete annotations