Limits of increasing the performance of Industrial Ethernet protocols

Jasperneite, Jürgen; Schumacher, Markus; Weber, K.

doi:10.1109/efta.2007.4416748

Cited by 98 publications

(64 citation statements)

References 5 publications

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“…Early works [5,6] formulated the end-to-end delay of the EtherCAT network and analyzed the achievable minimum cycle time according to the slave number and packet sizes. On the basis of a theoretical performance model, Seno et al presented the simulation model and the performance results in terms of two important performance indicators, i.e., minimum cycle time and jitter [7,21].…”

Section: Related Workmentioning

confidence: 99%

“…Thus far, however, there have been few studies that have analyzed the end-to-end delay of EtherCAT automation systems. Although some recent works have addressed the performance of EtherCATbased automation, they remain incomplete in that they either lack any consideration of the actual automation workload [13] or only deal with the network-level performance [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…EtherCAT, in particular, is one of the industrial Ethernet standards (IEC 61784 and 61158-2), which is gaining increasing acceptance in precision automation [3][4][5][6][7]. It offers numerous attractive features such as short cycle time as low as dozens of microseconds [6], globally synchronized clock with deviation of the sub-microsecond range [8], and compatibility with TCP/IP.…”

Section: Introductionmentioning

confidence: 99%

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Toward a Holistic Delay Analysis of EtherCAT Synchronized Control Processes

Sung

Kim

2013

INT J COMPUT COMMUN

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This paper analyzes the end-to-end delay of EtherCAT-based control processes that use the events of message frames and global clock for synchronized operation. With the end-to-end delay defined as the time interval between the start of a process cycle and the actual input or output, we develop a holistic delay model for control processes with EtherCAT, by taking into account the time for in-controller processing, message delivery, and slave-local handling. Based on the measurements from a real EtherCAT control system, we discuss the average and deviation of the process delay as we vary the number of slaves and process cycle time. The experiment results show that the output delays are mainly increased by the average controller delay, whereas the input delays are more affected by the deviation rather than the average of the controller delay. Our in-depth analysis on the controller reveals that the DMA (Direct Memory Access) overhead chiefly enlarges the controller delay for increasing number of slaves, while task release jitter is the main cause of the increased delay for longer cycle time. The presented delay model and evaluation results can be essentially used for the design of EtherCAT-based automation that requires highly synchronized operations, such as for coordinated motion and high-precision data sensing.

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Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Toward a Holistic Delay Analysis of EtherCAT Synchronized Control Processes

Sung

Kim

2013

INT J COMPUT COMMUN

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“…As studies in bus network, the proposal of the dynamic bandwidth allocation [1] for Ethernet PON(Passive Optical Network), the time synchronization on Gb/s Ethernet [2] which is necessary for the wide distributed system and the host configuration mechanism to network in Ethernet and wireless LAN [3] are studied. For application of Ethernet, an application method in industry [4], the performance of industrial Ethernet [5] and the performance of TDMA based network [6] are reported. And, about ad hoc network, impact of mobility [7], [8] are studied.…”

Section: Introductionmentioning

confidence: 99%

On a Characteristic of Data Transmission with Three or More Priority Levels in Bus Network

Ooki¹

2017

IJCCE

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This paper presents a characteristic of data transmission in bus network in which each datum has a priority and the number of priority levels are three or more. In this bus network, each station is connected to a bus through a switching-hub which establishes a link from a sending station to a receiving station. When the receiving station is sending data or receiving data, the link cannot be established and the sending station has to wait a little waiting time (stand-by time). Then, by defining the link probability as a constant, the bus network is analyzed.Taking note of one of the sending stations with r(r≥3) sending buffers for data with priority, in steady state, a balance equation of the probabilities of the number of waiting data at the ready time of sending is expressed. From the equation, for each priority, probabilities of the number of waiting data, mean of the number of waiting data in the sending buffer and mean waiting time which is the time from the arrival time of a datum at the sending buffer to the beginning time of sending the datum are derived. The calculated values of mean waiting time are illustrated and mean waiting times with priority processing are compared with mean waiting time without priority processing. As a result, the influence of the link probability on data transmission with priority processing is clarified.Key words: Bus network, priority processing, probability of the number of waiting data, mean of the number of waiting data, mean waiting time.

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“…And, the time synchronization on Gb/s Ethernet [4] which is necessary for the wide distributed system, the host configuration mechanism to network in Ethernet and wireless LAN [5] are studied. For application of Ethernet, an application method in industry [6], application to production factory [7], the performance of industrial Ethernet [8] and the performance of TDMA(Time Division Multiple Access) based network [9] are reported.…”

Section: Introductionmentioning

confidence: 99%

On a Characteristic of Data Transmission In Bus Network

Ooki¹

2014

JACN

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Abstract-Bus network is a primary topology in local area network and the network had a problem of data collision on the bus which influenced the efficiency of data transmission. Recently, using switching-hub that establishes a link from a sending station to a receiving station, the number of data collisions extremely decreased. However, in the case that the data buffer of a receiving station is full or the receiving station is sending or receiving data, a sending station has to wait for sending data. This waiting time (stand-by time) influences an efficiency of data transmission. In this paper, a characteristic of data transmission with the stand-by time in bus network is clarified. Taking note of one station with a sending data buffer, the link probability that the link from the station to a receiving station will be established is defined as constant. The station connected to the bus is modeled as a queue with stand-by time, and then state equations of the probability of the number of waiting data at the ready time of sending are expressed. From the equations, probabilities of the number of waiting data, mean of the number of waiting data in the sending buffer and mean waiting time which is the time from the data arrival time at the sending buffer to the beginning time of sending are derived. The calculated values are illustrated with the link probabilities in several cases, and then the influences of the link probability to data transmission are shown.Index Terms-Bus network, link probability, the number of waiting data, mean waiting time.

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Limits of increasing the performance of Industrial Ethernet protocols

Cited by 98 publications

References 5 publications

Toward a Holistic Delay Analysis of EtherCAT Synchronized Control Processes

Toward a Holistic Delay Analysis of EtherCAT Synchronized Control Processes

On a Characteristic of Data Transmission with Three or More Priority Levels in Bus Network

On a Characteristic of Data Transmission In Bus Network

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