Quality of service concerns in IP-based control systems

The popularity of network-based control systems (NBCS) is continuously growing. One of the most intriguing aspects is the transportation of control network data over IP-based networks using accepted standards such as EIA-852. To a large extent the actual quality of control (QoC) in such systems depe...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2004-12, Vol.51 (6), p.1249-1258
Main Authors: Soucek, S., Sauter, T.
Format: Article
Language:English
Subjects:
Automatic control
Automation
Classification
Communication system control
Computer simulation
Control engineering
Control network
Control systems
Delay
Delay effects
Field buses
fieldbus
Internet telephony
internetworking
Jitter
network-based control
Networks
quality of control (QoC)
Quality of service
quality of service (QoS)
Studies
Transportation
Tunneling
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Summary:The popularity of network-based control systems (NBCS) is continuously growing. One of the most intriguing aspects is the transportation of control network data over IP-based networks using accepted standards such as EIA-852. To a large extent the actual quality of control (QoC) in such systems depends on the network timing such as delay and delay jitter. This paper presents a classification of relevant quality of service parameters and identifies application classes. Subsequently, the paper focuses on the effect of delay jitter at a fixed mean delay on the QoC. Two sources of delay jitter are identified in IP-based control systems: 1) network traffic induced and 2) protocol induced. As an example of a simple control loop implemented over an EIA-852-based system we investigate how the induced jitter affects the QoC using a time-discrete simulation model. Conclusions are drawn as to how the findings in the EIA-852 system can be interpreted and extended to a generalized NBCS.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2004.837860