Adaptive Dynamic Adjustment Method for Communication Loop

Abstract

The present invention relates to an adaptive dynamic adjustment method for a communication loop. The technical proposal is that the real-time voltage Vh of the communication loop is collected by a high-speed oscilloscope, and a comparator compares the real-time voltage Vh with a reference voltage Vref, and outputs a difference signal to a threshold comparator. The threshold comparator compares the received difference signal with the preset threshold, outputs a "0" or "1" signal to the counter, and the counter generates a binary control signal through the signal and outputs it to the resistance array unit, the resistance array unit The resistance value of the access communication loop is controlled by the binary control signal sent by the counter, and the change of the resistance resistance value of the access communication loop changes the real-time voltage Vh, thereby forming a negative feedback closed-loop loop and realizing dynamic adaptive adjustment of the communication loop.

Description

technical field [0001] The invention relates to a Profibus-DP communication loop, and proposes an adaptive dynamic adjustment method for the Profibus-DP communication loop. Background technique [0002] Profibus field bus is a widely used open digital communication system, especially in the field of factory automation and process automation. It is suitable both for fast, time-critical applications and for complex communication tasks. The hardware involved in the traditional Profibus communication circuit mainly includes: Profibus interface, communication medium, Profibus plug, repeater, photoelectric converter and terminal matching resistor, etc. Among them, the schematic diagram of the Profibus-DP communication loop circuit is as follows: figure 1 As shown, it mainly includes the communication network power supply S (called the communication master station), the twisted pair communication cable, and the N devices on the communication network segment (X 1 -X N , known as...

AI Technical Summary

Problems solved by technology

Among them, the schematic diagram of the Profibus-DP communication loop circuit is as follows: figure 1 As shown, it mainly includes the communication network power supply S (called the communication master station), the twisted pair communication cable, and the N devices on the communication network segment (X 1 -X N , known as the communication slave station) and the terminal matching resistance R 终端 , they are combined (parallel) together to form a Profibus-DP communication circuit. During the on-site debugging, it is found that the traditional Profibus communication circuit has the following deficiencies: First, the terminal matching resistance parameters in the Profibus-DP circuit are often fixed, while the actual circuit will be Affected by on-site wiring and external interference, the equivalent impedance of the communication circuit will change, which will reduce the matching performance with the terminal matching resistance and affect the communication quality and transmission reliability.

Second, the communication quality and communication voltage of the Profibus-DP circuit lacks an effective online monitoring function, especially for the fluctuation of the communication circuit caused by external interference, and lacks effective dynamic adjustment means, which affects the reliability of the overall circuit

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