Web services in automation systems usally use XML technology for data exchange functions. Actual web browsers include XML functionality already as standard and therefore they are very promising candidates for implementing monitoring and operating functions of web services. But web browsers typically incorporate only a subset of web technologies and their availability may be characterized by a relatively short live time compared to automation solutions. So many existing libraries for web based monitoring and operating are implemented with Java and some new versions of browsers do no longer support Java natively. An interesting alternative are XML-based graphical user interface languages developed for the office world, but existing languages do not meet the requirements of real time visualization in automation. To overcome these deficiencies this paper presents a new language for web based monitoring and operating supporting web services for the data exchange.
This paper presents the combination of two distinct model driven HMI engineering approaches. Together they setup a complete toolchain that lays the basis for the model driven (semi)automatic generation of flexible, multi-platform HMIs for process industries. The two approaches are autoHMI which derives a concrete UI design from Computer Aided Engineering Data, and XVCML which allows to generate final UIs for different web implementation paradigms like XHTML or Java on top of OPC UA. This tool integration provides a complete model driven software engineering architecture that cuts down the manual efforts in HMI engineering close to zero. This is a prerequisite to handle the complexity of context adaptive interfaces.
Zusammenfassung
Die Zusammenführung modellbasierter und nutzerzentrierter Entwurfsprozesse bei der Entwicklung von Benutzungsschnittstellen kann die Gebrauchstauglichkeit der resultierenden Benutzungsschnittstellen verbessern. Aus der Kombination der Entwurfsprozesse erwachsen Anforderungen an die notwendigen Modelltransformationen. Als zentrale Herausforderung wird in diesem Beitrag die Überwindung der Abstraktionslücke zwischen abstrakten und konkreten Modellen betrachtet. Anhand einer Transformation innerhalb des nutzerzentrierten Entwicklungsprozesses der Useware zur Integration einer domänenspezifischen Sprache der Automatisierungstechnik, werden die Herausforderungen der Modelltransformationen analysiert und mit den Mitteln der modellgetriebenen Software-Entwicklung gelöst. Weiterhin wird die Unterstützung von iterativem Vorgehen in modellbasierten Entwicklungsprozessen untersucht und als Lösung das Persistant Transformation Mapping vorgeschlagen.
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