Real-time performance evaluation of urgent aperiodic messages in FF communication and its improvement

Wang, Zhi; Shen, Xingfa; Chen, Jiming; Song, Ye-Qiong; Wang, Tianran; Sun, Youxian

doi:10.1016/j.csi.2004.05.001

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…Analyzing, for example, the Modbus specification as well as other non-standard extensions [27], we can argue that only Modbus RTU is suitable for real-time communications. Modbus ASCII allows a maximum of 6 seconds between characters, which is unacceptable for any real-time application [28], and Modbus TCP/IP uses the TCP/IP stack, which is of the best-effort type.…”

Section: Figure 5 the Time Period Between Two Requests Sent By The Cl...mentioning

confidence: 99%

Modbus Protocol Performance Analysis in a Variable Configuration of the Physical Fieldbus Architecture

Găitan

Zagan

2022

IEEE Access

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Few developments have changed the evolution of the automation process as substantially as the development of industrial local area networks and communication protocols. Especially fieldbus systems, networks created for the lowest levels of the automation hierarchy, have an enormous influence on the flexibility and performance of modern automation systems in all application areas. The technique of updating data on Modbus type devices involves a procedure of reading data at regular time intervals called pooling. Some automation processes include interdependence between different control variables belonging to different hardware devices. This paper presents and analyzes various scenarios related to a variable architecture configuration of physical modules based on Modbus communication protocol. The proposed Modbus Extension (ModbusE) concept is presented by defining the new optimized message format, and the structure of the acquisition cycle to obtain a deterministic temporal behavior, solutions for describing devices at the Modbus protocol level being presented. The status update of each Modbus module is done according to the address of the device, but also the number of registers per device. The paper analyses the worst-case scenario of communication involving Modbus devices on the same network and exchanging data corresponding to one or more server registers.INDEX TERMS Modbus, local industrial networks, acquisition cycle, fieldbus.

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Section: Figure 5 the Time Period Between Two Requests Sent By The Cl...mentioning

confidence: 99%

Modbus Protocol Performance Analysis in a Variable Configuration of the Physical Fieldbus Architecture

Găitan

Zagan

2022

IEEE Access

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“…These function blocks will be executed only after the required inputs are scheduled to be available. To address the case, where a device providing an input becomes unavailable, the user can configure the number of consecutive communications that may be lost before the input status of the receiving device is set to the bad state and consequently the actual mode of the block using this input switches to manual [10,11].…”

Section: Basics Of Fb Implementationmentioning

confidence: 99%

Design and implementation of a new fuzzy PID controller for networked control systems

Fadaei

Salahshoor

2008

ISA Transactions

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Extension of prioritized data analysis in the Foundation Fieldbus to three classes

Lee

Min

Hong

2011

Int J Communication

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SUMMARYThe Foundation Fieldbus data link layer provides both a token-passing service required for sporadic data and a scheduled service for periodic data. It has three priority levels: urgent, normal, and timeavailable. Modeling the virtual token rotation time (VTRT), which is the time required to receive tokens for the transmission of one's own data, is difficult due to the interactive data delay driven by the three priority levels. Therefore, a simplified mathematical model consisting of just two priority levels has been considered. In a previous research, the VTRT probability density function was defined using the probability of a token generation; however in the present study, a simpler expression was successfully developed in a system of three priority levels by tracking the token's priority changes generated by the link active scheduler. These priority changes are tracked by using the state transition probability and the state transition diagram of a token. Therefore, the success of this new mathematical model makes this research important. Furthermore, we found the existence and the cause of a fluctuating state, both of which are useful to a system designer for setting network parameters. The validity of the analytical model was verified in a simulation experiment.

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Real-time performance evaluation of urgent aperiodic messages in FF communication and its improvement

Cited by 10 publications

References 13 publications

Modbus Protocol Performance Analysis in a Variable Configuration of the Physical Fieldbus Architecture

Modbus Protocol Performance Analysis in a Variable Configuration of the Physical Fieldbus Architecture

Design and implementation of a new fuzzy PID controller for networked control systems

Extension of prioritized data analysis in the Foundation Fieldbus to three classes

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