[논문]Experimental Performance Evaluation of BACnet MS/TP Protocol

Park, Tae-Jin; Song, Won-Seok; Hong, Seung-Ho

[국내논문] Experimental Performance Evaluation of BACnet MS/TP Protocol 원문보기

International Journal of Control, Automation and Systems, v.5 no.5, 2007년, pp.584 - 593

Park, Tae-Jin (School of Electrical Engineering and Computer Science, Hanyang University) , Song, Won-Seok (R&D Center) , Hong, Seung-Ho (School of Electrical Engineering and Computer Science, Hanyang University)

Abstract ▼ AI-Helper

BACnet is a standard data communication protocol especially designed for building automation and control networks. BACnet uses the Master-Slave/Token-Passing (MS/TP) protocol as one of its field-level networks. In this study, the performance of the BACnet MS/TP protocol is evaluated using an experimental model. The network performance is investigated and evaluated in terms of token rotation time and round trip time. The experimental results show that the performance of the MS/TP network is heavily influenced by the network traffic load, the assignment of MS/TP node address and the network configuration parameter called $N_{max_info-frames}$. Based on the experimental results, simple practical designing guidelines for BACnet MS/TP network systems are also proposed.

Keyword

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문제 정의

The objective of this study is to evaluate the performance of the BACnet MS/TP protocol 나sing an experimental model in terms of token rotation time and ro니nd trip time. The first stage version of the experimental model and its brief experimental analysis results were introduced in [11].
In this study, a BACnet MS/TP field controller and an experimental model of a BACnet MS/TP network system are developed to evaluate the performance of the BACnet MS/TP protocol. The experimental results 아low that the broadcasting the “BACnet Data Expecting Reply" frame is not desirable because it causes the instant increment of TRT.

가설 설정

(2) Higher Nmax_info_frames values increase TRT as the network traffic load increases. Lower Nmax_info_frames values increase RTT because they increase the queuing delay in the transmitter queue.

제안 방법

The first stage version of the experimental model and its brief experimental analysis results were introduced in [11]. In this study, a new experimental model is developed with new hardware and software in order to get more detailed experimental results. The experimental model developed in this study consists of ten BACnet MS/TP field controllers, one central controller and one monitoring computer.

대상 데이터

In this study, a new experimental model is developed with new hardware and software in order to get more detailed experimental results. The experimental model developed in this study consists of ten BACnet MS/TP field controllers, one central controller and one monitoring computer. The BACnet MS/TP field controller is developed in the form of BACnet Application Specific Controller (B-ASC) [5], The experimental results show that the performance of the BACnet MS/TP protocol is greately influenced by the network traffic load, the assignment of MS/TP node address and the network configuration parameter "Nmax_info_什ames・" The experimental results from this study wifi facilitate the design and installation of the BACnet MS/TP network-based control systems in building automation area.
In this study, the experimental model of the BACnet MS/TP network system is composed with ten BACnet MS/TP field controllers and one central controller. The BACnet MS/TP field controller is designed and implemented in the form of BACnet Application Specific Controller (B-ASC).
7. The experimental model consists of ten BACnet MS/TP field controllers, one central controller and one monitoring computer. The central and field controllers are connected on 76800bps BACnet MS/TP network.

성능/효과

However, the maximum TRT in broadcast mechanism increases exponentially over 2s as the traffic load increases, and it is much higher than the maximum TRT in original unicast mechanism. According to the experimental result, broadcasting the "BACnet Data Expecting Reply” frame is not desirable because the broadcasted service request causes every node in the BACnet MS/TP network to respond to the request almost at the same time so that the broadcasted request leads instant increment of traffic load on the network and it causes TRT to increase instantly. The broadcasting “BACnet Data Expecting Reply” mechanism is neglected in the following experiments.
In order to maximize network performance and reduce the network-induced delays, the experimental results obtained in this study suggest that a network designer should select the appropriate Nmax_inf0_frames value according to the system configuration and message distribution in the BACnet MS/TP network, and the MS/TP node address should be properly assigned according to the system configuration. The actuating-ASC which has the internal actuator function or the controlling-SA which has the internal controller function is more desirable in the BACnet MS/TP network-based control sy아em.

후속연구

The experimental results from this study will facilitate the design and installation of the BACnet MS/TP network-based control systems in building automation area.

참고문헌 (15)

H. M. Newman, Direct Digital Control of Building Systems: Theory and Practice, John Wiley & Sons, Inc., New York, 1994
V. Boed, Networking and Integration of Facilities Automation Systems, CRC Press, Boca Raton, 2000
S. T. Bushby, 'BACnet $^{TM}$ : A standard communication infrastructure for intelligent buildings,' Automation in Construction, vol. 6, no. 5-6, pp. 529-540, 1999

상세보기
S. T. Bushby and H. M. Newman, 'BACnet today,' Supplement to ASHRAE Journal, vol. 44, no. 10, pp. 10-18, 2002
ASHRAE Guideline 13-2000, Specifying Direct Digital Control Systems, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA, 2000
ANSI/ASHRAE Standard 135-2004, BACnet: A Data Communication Protocol for Building Automation and Control Networks, American Society of Heating, Refrigeration, and Air-Conditioning Engineers Inc., Atlanta, GA, 2004
ISO 16484-5, Building Automation and Control Systems-Part 5. Data Communication Protocol, ISO, Washington, DC, 2003
KS X 6909, Building Automation and Control Network (BACnet), Korean Standards Association, Seoul, 1999
W. S. Song, S. H. Hong, and S. T. Bushby, NISTIR 7038-A Simulation Analysis of the BACnet LANs, National Institute of Standards and Technology, Gaithersburg, October, 2003
W. S. Song and S. H. Hong, 'Performance evaluation of a BACnet-based fire detection and monitoring system in buildings,' International Journal of Control, Automation and Systems, vol. 4, no. 1, pp. 70-76, 2006

원문보기 상세보기
T. J. Park, Y. C. Kwon, and S. H. Hong, 'Performance Evaluation of BACnet MS/TP Protocol Using Experimental Model,' Proc. of IEEE International Conference on Industrial Technology, pp. 577-582, 2005
S. K. Park and K. W. Miller, 'Random number generators: Good ones are hard to find,' Communications of the ACM, vol. 31, pp. 1192-1201, 1988

상세보기
D. E. Knuth, The Art of Computer Programming vol. 2 : Seminumerical Algorithms, 3rd ed., Addison-Wesley, 1997
W. H. Press, S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, Numerical Recipies in C++, 2nd ed., Chapter 7, Cambridge University Press, 2003
http://www.bacnet.org/Addenda/index.html

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[국내논문] Experimental Performance Evaluation of BACnet MS/TP Protocol 원문보기

Abstract ▼ AI-Helper

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가설 설정

제안 방법

대상 데이터

성능/효과

후속연구

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[국내논문] Experimental Performance Evaluation of BACnet MS/TP Protocol 원문보기

Abstract ▼ AI-Helper

Keyword

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문제 정의

가설 설정

제안 방법

대상 데이터

성능/효과

후속연구

참고문헌 (15)

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