Abstract

With the application of digital information technology and communication technology, industrial intelligence and integration also began to develop rapidly, and the importance of the research on bus communication in industrial control communication also increased. As the first international bus standard, PROFIBUS has been widely used in the field of industrial control; in recent years, it was mainly used to connect devices to the control layer and convert data through token transmission. Based on the understanding of the transmission mechanism of PROFIBUS fieldbus protocol, this article carries out a simulation study on its communication performance. Through analysis of the data link layer, changing the target token cycle time (high and low priority) and random setting each site message number, as well as the number of master station and slave station, how the main token latency and packet loss rate and efficiency of bus affect the change of performance parameters was observed. For multiple communication systems, the relationship between the address value on the main token ring and transport performance is found by experiments on the site address value on the main token ring and the target token cycle time value. Finally, the scheduling algorithm is applied to the communication scheduling of PROFIBUS fieldbus. The results confirm that the scheduling algorithm has better transmission efficiency than the traditional MAC media access protocol under the condition that the load rate does not exceed 100%, which makes up for the shortcomings of the original PROFIBUS bus system and makes the communication performance better.

Highlights

  • The distributed control system is gradually formed in the field of industrial control

  • The application of fieldbus enables the smart devices to be directly added to the field devices, which greatly improves the convenience of equipment installation

  • The transmission efficiency of the two is similar, but the EDF scheduling algorithm can ensure the transmission of messages with strong real-time performance, so that the success rate of message transmission is improved to some extent

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Summary

Introduction

The distributed control system is gradually formed in the field of industrial control. The real-time communication simulation process designed for the data link layer provides the data and the theory of experience; it provides a certain theoretical basis for the practical engineering application of PROFIBUS field bus the field of industrial control. PROFIBUS is a bus in the physical layer, and a ring in the data link layer, that is, a token type.[3] This integration mode enables the physical layer, that is, the field equipment, to increase or decrease at any time for convenient operation. The MAC media transmission mechanism can briefly describe the node with the smallest address of the primary station and create a token after power on, which is passed from a primary station to the station.[6] The token receiver has the right to transmit the message within the specified token holding time.

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