Nuclear power plant field bus communication error rate test device and test method

A technology of bit error rate testing and fieldbus, applied in the direction of error detection/prevention using signal quality detector, electrical components, general control system, etc. Communication data link and other problems, to achieve the effect of shortening test time and high data processing capacity

Active Publication Date: 2020-12-29
NUCLEAR POWER INSTITUTE OF CHINA
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  • Claims
  • Application Information

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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...

Method used

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  • Nuclear power plant field bus communication error rate test device and test method
  • Nuclear power plant field bus communication error rate test device and test method
  • Nuclear power plant field bus communication error rate test device and test method

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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 nuclear power plant field bus communication error rate test device and test method. The nuclear power plant field bus communication error rate test device comprises an errorrate detection unit, a terminal resistance configuration unit and a communication parameter input/output unit, wherein the bit error rate detection unit is realized based on a programmable logic device, and is used for generating a pseudo-random test signal and transmitting the pseudo-random test signal to a link of a to-be-tested field bus so as to test a bit error rate of the link of the to-be-tested field bus; the terminal resistance configuration unit is used for realizing electrical isolation between the bit error rate detection unit and the to-be-tested bus, and adjusting a terminal resistance value matched with the link of the to-be-tested field bus according to test parameters; and the communication parameter input/output unit is used for realizing environmental parameter input ofthe to-be-tested field bus and outputting a communication parameter result obtained by testing to an upper computer. According to the nuclear power plant field bus communication error rate test device, the communication function and the transmission signal error rate of the link of the field bus can be comprehensively and systematically tested.

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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IPC IPC(8): H04L12/26H04L1/20G05B19/042
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
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