IEC 62769-1:2021 pdf free download – Field device integration(FDI)
Two different device integration technologies exist: the Electronic Device Description Language(EDDL) in accordance with IEC 61804 and the Field Device Tool (FDTR) in accordance withiEC 62453.While these technologies take different approaches to solve the problem, there is alot of overlap between them. This has led to a situation where the technologies compete insteadof complementing each other.As a result,system suppliers have taken their positions, devicesuppliers have had to double their efforts in order to support EDDL and FDTR, and the endusers have become frustrated because they want the best of both technologies.
For all parties involved,the ideal solution looks different. System suppliers want to achieverobustness while assuring a high level of technology and platform independence. Devicesuppliers want to support only one technology instead of two in order to reduce cost and effort,and they want to provide the optimal means for operating their devices.End users want to avoidfalse investments and therefore demand only one future-proof solution that offers all theadvantages of the competing technologies.
4.2 Electronic Device Description Language (EDDL)
The Electronic Device Description Language (EDDL) is a language for describing the behaviorof field devices. It enables systems to configure,calibrate,troubleshoot, and operate a fielddevice without any prior knowledge of the device.
Device descriptions written in EDDL describe the capabilities of the field device; it is up to thesystem to determine how to utilize these capabilities.These device descriptions enable systemsto access all the data and properties of all devices,which simplifies the maintenance, support,and operation of the devices. it works well for small handheld applications and large integratedautomation systems. It works well for embedded systems and systems running on commercialoperating systems.
With EDDL, the device supplier can organize the device’s data, properties,and procedures foraccess by the end user. This provides the system guidance in dynamically creating a userinterface for the device.The capabilities of this user interface can vary significantly for differentclasses of devices, and it can be as simple or complex as the device being described.
ln the early 1990s, the first version of EDDL was created and was used to describe HART fielddevices. In 1996, the EDDL was used to describe FoUNDATION Fieldbus devices. Then in 2000,it was used to describe PROFIBUS devices.All three versions of EDDL can trace their lineageback to the original HART version.Therefore, all three versions are largely the same, with somedifferences due to differences in the underlying communication protocols. EDDL wasstandardized first as part of lEC 61804-3 and lEC 61804-4 in March 2004.
4.4OPC Unified Architecture (OPC UA)
OPC Unified Architecture (OPC UA) is a platform-independent standard through which variouskinds of systems and devices can communicate by sending messages between clients andservers over various types of networks. It supports robust, secure communication that assuresthe identity of clients and servers and resists attacks.
OPC UA defines standard sets of services that servers can provide，and individual serversspecify to clients what service sets they support.The services act on an object model which ismanaged by the server and discoverable by a client. Information is conveyed using standardand vendor-defined data types,and servers define object models that clients can dynamicallydiscover.Servers can provide access to both current and historical data, as well as alarms andevents to notify clients of important changes.
OPC UA can be mapped onto a variety of communication protocols and data can be encodedin various ways to trade off portability and efficiency.Transports and encodings for XML basedWeb Services as well as a high-performance binary are defined for OPC UA.The abstractionof the oPC UA standard from any particular technology provides future-proofing allowing oPCUA to be mapped onto future technologies.