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IEC 62541-10-2020 pdf free download

IEC 62541-10-2020 pdf free download.OPC unified architecture – Part 10: Programs.
4 Concepts
4.1 General
Integrated automation facilities manage their operations through the exchange of data and the coordinated invocation of system Functions as illustrated in Figure 1. Services are required to perform the data exchanges and to invoke the Functions that constitute system operation. These Functions may be invoked through Human Machine Interfaces, cell controllers, or other supervisory control and data acquisition type systems. OPC UA defines Methods and Programs as an interoperable way to advertise, discover, and request these Functions. They provide a normalizing mechanism for the semantic description, invocation, and result reporting of these Functions. Together Methods and Programs complement the other OPC UA Services and Object Types to facilitate the operation of an automation environment using a client-server hierarchy.
Methods and Programs model Functions typically have different scopes, behaviours, lifetimes, and complexities in OPC Servers and the underlying systems. These Functions are not normally characterized by the reading or writing of data which is accomplished with the OPC UA Attribute service set.
Methods represent basic Functions in the Server that can be invoked by a Client. Programs, by contrast, model more complex and stateful functionality in the system. For example, a method call may be used to perform a calculation or reset a counter. A Program is used to run and control a batch process, execute a machine tool part program, or manage a domain download. Methods and their invocation mechanism are described in IEC 6254 1-3 and
IEC 62541-4.
This document describes the extensions to, or specific use of, the core capabilities defined in IEC 62541-5 as required for Programs.
4.2 Programs
4.2.1 Overview
Programs are complex Functions in a Server or underlying system that can be invoked and managed by a Client. Programs can represent any level of functionality within a system or process in which Client control or intervention is required and progress monitoring is desired. Figure 2 illustrates the model.IEC 62541-10 pdf download.

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