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A test device and test method for bit error rate of nuclear power plant fieldbus communication

A bit error rate test, field bus technology, applied in the use of signal quality detectors for error detection/prevention, electrical components, general control systems, etc. Link impedance discontinuity and other problems, to achieve the effect of shortening test time and high data processing capacity

Active Publication Date: 2022-02-01
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the field bus is transmitted over a long distance, the parasitic parameters of the transmission cable will cause the impedance of the bus link to be discontinuous, thereby generating reflected noise signals, affecting the communication data link, and increasing the bit error rate of the communication
The solution is to reduce the bit error rate of the bus link by configuring the terminal resistance and reducing the communication baud rate. However, the configuration parameters of the terminal resistance and communication baud rate are often set according to the simulation calculation in the early stage of design, which cannot be done well during the construction process. Reliable communication parameter adjustments are made according to differences in field wiring, and the access of node devices from different manufacturers will change the actual impedance of the bus link. At present, no effective bit error rate test is performed on the adjusted link in field applications, and the optimized Bus link communication parameters, lack of flexibility and poor reliability

Method used

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  • A test device and test method for bit error rate of nuclear power plant fieldbus communication
  • A test device and test method for bit error rate of nuclear power plant fieldbus communication
  • A test device and test method for bit error rate of nuclear power plant fieldbus communication

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Embodiment 1

[0048] This embodiment proposes a bit error rate testing device for nuclear power plant fieldbus communication. The test device of this embodiment realizes the test of the transmission bit error rate based on a programmable logic device (FPGA), and outputs the bit error rates corresponding to different communication baud rates under the transmission distance, and at the same time, measures the optimal transmission distance under a given transmission distance. The terminal matches the resistance value and the communication baud rate, which is convenient for configuring appropriate transmission parameters according to actual needs in engineering applications.

[0049] Such as figure 1 As shown, the test device of this embodiment includes a bit error rate detection unit, a terminal resistor configuration unit, a communication parameter input / output unit and a power management unit.

[0050] Each functional unit of the test device is described as follows:

[0051] 1. Bit error r...

Embodiment 2

[0066] The testing device that proposes based on above-mentioned embodiment 1 realizes the test to a field bus to be tested, and concrete process is as follows:

[0067] On-site actual application test device access method is as follows: Figure 4 As shown, two test devices are configured to be connected to the first and last ends of the bus link respectively. Multiple node devices on the bus link are connected to the bus using a daisy chain topology. This topology requires that the length of the branch line connecting the nodes to the bus be as small as possible, generally within 40cm, to prevent the signal from being too long. cause disturbance. This design uses a dedicated field bus D-SUB connector to directly branch out two lines to access the bus, eliminating the influence factors of too long branch lines and improving communication reliability.

[0068] After receiving the actual field bus parameters such as bus cable transmission impedance, bus cable length, communica...

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Abstract

The invention discloses a bit error rate test device and a test method for the field bus communication of a nuclear power plant. The test device of the invention includes a bit error rate detection unit, a terminal resistance configuration unit and a communication parameter input / output unit; the bit error rate detection The unit is implemented based on a programmable logic device, and is used to generate a pseudo-random test signal and transmit it to the link of the field bus to be tested to test the bit error rate of the field bus link to be tested; the terminal resistance matching unit is used for Realize the electrical isolation of the bit error rate detection unit and the bus to be tested, and adjust the fieldbus link to be tested according to the test parameters to match the terminal resistance value; the communication parameter input / output unit is used to realize the environmental parameter input of the fieldbus to be tested, And output the communication parameter results obtained by the test to the host computer. The invention can comprehensively and systematically test the communication function of the field bus link and the bit error rate of transmission signals.

Description

technical field [0001] The invention belongs to the field of instrument control devices for safety level protection systems of nuclear power plants, and in particular relates to a bit error rate test device and a test method for field bus communication of nuclear power plants. Background technique [0002] In the digital instrument control system in the field of nuclear power, the development and progress of communication network technology and control system make the field bus control system get a good application in the field of nuclear power. At present, field bus control system standards such as Profibus bus, Modbus bus and Interbus bus are mainly used in the industry. Fieldbus physical layer transmission technology often adopts RS-485 standard transmission, shielded twisted pair cable as the transmission cable, the transmission rate can be selected between 4.8kbit / s ~ 12Mbit / s, the selected transmission communication baud rate is based on the actual Design parameters s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L43/0823H04L1/20G05B19/042
CPCH04L43/0847H04L1/203G05B19/0423
Inventor 刘明星丁捷梁建秦官学马文桂郑晓严浩杨有维黄起昌田旭峰王舜
Owner NUCLEAR POWER INSTITUTE OF CHINA