Software is more and more becoming the major cost factor for embedded devices. Already today, software accounts for more than 50 percent of the development costs of such a device. However, software development practices in this area lag far behind those in the traditional software industry. Reuse is hardly ever heard of in some areas, development from scratch is common practice and component-based software is usually a foreign word. PECOS is a collaborative project between industrial and research partners that seeks to enable component-based technology for a certain class of embedded systems known as "field devices" by taking into account the specific properties of this application area. In this paper we introduce a component model for field device software. Furthermore we report on the PECOS component composition language CoCo and the mapping from CoCo to Java and C ++ .
Durch die Einführung kurzlebiger, preiswerter Commercial-off-the-Shelf-Komponenten (CotS) in moderne Prozessleitsysteme konnten die Anschaffungskosten dieser Systeme dramatisch verringert werden. Allerdings führt die hohe Obsoleszenzrate der CotS-Komponenten zu einem enormen Anstieg der Systemerneuerungen im Laufe des Lebenszyklus. Durch die Kostenverschiebung in die Nachkaufphase wird gleichzeitig der seriöse Vergleich zwischen Investitionsalternativen erschwert. Die in diesem textdata vorgeschlagene Lösung verwendet Lebenszykluskosten als Entscheidungsbasis für Investitionen in Leitsysteme. Der Idee der Lebenszykluskosten wird schon in anderen Branchen Rechnung getragen, daher konzentriert sich der vorliegende Ansatz auf die Eigenheiten der Domäne Prozessautomation.
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