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Distribuerade fastighetsautomationssystem: - En implementation av kommunikationsprotokollet BACnet
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2008 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Distributed Building Automation Systems : -Implementing the BACnet communication protocol (English)
Abstract [en]

Building Automation Systems in commercial buildings are often designed and installed by different contractors, using equipment and components from different manufacturers. The lack of an accepted communication standard has resulted in a few different standards. Many manufacturers of building automation systems only support one, a few or none of these standards, while developing proprietary system solutions. Regin, who develop such equipment, are planning to adopt an open communication protocol specially designed for building automation - BACnet. As a step in that direction this thesis was announced with the purpose to investigate the possibility to implement BACnet in one of their products and to gain more knowledge of the BACnet protocol. Literature covering computer communication and distributed systems has been reviewed and relevant requirements that apply to building automation systems have been identified. The BACnet standard has proven to support many of the requirements on such systems. However, there are some limitations that need to be considered if BACnet is implemented in safety critical systems, e.g. redundant communication infrastructure between two BACnet nodes is not allowed. The BACnet communication protocol (with limited functionality) has been implemented and tested in a Regio zone controller. Some of the original Regio features had to be compromised to fit the code in memory. However, by optimizing the code and using another compiler there is a good possibility that a fully functional "BACnetified" Regio can be developed as an extension of this project.

Abstract [sv]

Fastighetsautomationssystem i kommersiella byggnader konstrueras ofta av olika installatörer som använder sig av utrustning och komponenter från olika tillverkare. Avsaknaden av ett allmänt vedertaget standardiserat kommunikationsprotokoll har resulterat i att ett antal olika standarder har utvecklats. Tillverkare av fastighetsautomationssystem stödjer antingen något, några eller inga av dessa standarder, samtidigt som de utvecklar egna kommunikationslösningar. Regin, som tillverkar fastighetsautomationssystem, har planer på att införa stöd för ett öppet kommunikationsprotokoll, speciellt utvecklat för fastighetsautomation – BACnet. Som ett steg i den riktningen utlystes detta examensarbete, med syfte att undersöka möjligheterna att implementera BACnet i en av deras produkter samt att generellt höja Regins kunskapsnivå inom området BACnet. En litteraturstudie inom datorkommunikation och distribuerade system har genomförts för att identifiera krav som är relevanta för fastighetsautomation. BACnet standarden visar sig ha stöd för många av de krav som ställs på sådana system. Det finns dock begränsningar som måste beaktas om BACnet implementeras i säkerhetskritiska system. Det är till exempel inte tillåtet att ha redundant kommunikationsinfrastruktur mellan två BACnet noder. BACnet (med begränsad funktionalitet) har implementerats och testats i en Regio rumsregulator. Vissa funktioner har skalats bort för att koden skulle få plats i programminnet. Genom att optimera koden och att använda en annan kompilator finns det dock goda möjligheter att utveckla en fullt funktionell "BACnetifierad" Regio som en fortsättning av detta projekt.

Place, publisher, year, edition, pages
2008.
Series
MMK 2008:75 MDA334
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-100710OAI: oai:DiVA.org:kth-100710DiVA: diva2:544594
External cooperation
REGIN AB,Anders Ågren
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-15 Created: 2012-08-15 Last updated: 2012-08-15Bibliographically approved

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Lars Hansson(1519 kB)559 downloads
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