CN113608513A - DCS real-time testing device and method - Google Patents

DCS real-time testing device and method Download PDF

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CN113608513A
CN113608513A CN202110673289.3A CN202110673289A CN113608513A CN 113608513 A CN113608513 A CN 113608513A CN 202110673289 A CN202110673289 A CN 202110673289A CN 113608513 A CN113608513 A CN 113608513A
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transmission mode
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CN113608513B (en
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雷志伟
张兴
武海澄
张剑
阚俊超
周海雁
叶康利
曲晓荷
刘后胜
王飞
游斯伟
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Datang Boiler Pressure Vessel Examination Center Co Ltd
East China Electric Power Test Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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Datang Boiler Pressure Vessel Examination Center Co Ltd
East China Electric Power Test Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
    • G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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    • G05B2219/24065—Real time diagnostics

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Abstract

一种DCS系统实时性测试装置及方法，属于电厂发电技术领域，解决如何对工业生产的DCS系统实时性进行测试，准确诊断DCS系统在数据收发方面的性能、保障生产过程控制的安全、稳定、高效的问题；通过多个信号采集回路，使得该测试结果能够区分出DCS控制器在不同传输方式下的数据接包率、数据发包率、网络传输迟延上各自的性能，从而更加精确地测量出DCS控制器实时性，而且不受第三方控制器性能干扰。本发明设计的集数据接包率、数据发包率、网络传输迟延等性能测试于一体的测试装置，可以快速、直观、准确地显示测量结果，便于分析、统计、计算DCS系统实时性。

Figure 202110673289

A real-time testing device and method for a DCS system, belonging to the technical field of power generation in power plants, and solving how to test the real-time performance of an industrially produced DCS system, accurately diagnose the performance of the DCS system in terms of data transmission and reception, and ensure the safety, stability, and reliability of production process control. The problem of high efficiency; through multiple signal acquisition loops, the test results can distinguish the respective performances of the DCS controller in terms of data packet rate, data packet transmission rate, and network transmission delay under different transmission modes, so as to measure the performance of the DCS controller more accurately. The DCS controller is real-time and not disturbed by the performance of third-party controllers. The test device designed by the invention integrates performance tests such as data packet receiving rate, data packet sending rate, network transmission delay, etc., can display the measurement results quickly, intuitively and accurately, and is convenient for analysis, statistics and calculation of the real-time performance of the DCS system.

Figure 202110673289

Description

DCS real-time testing device and method
Technical Field
The invention belongs to the technical field of power plant power generation, and relates to a real-time testing device and method for a DCS (distributed control system).
Background
The real-time performance of the DCS reflects the processing capacity of the control system in the aspects of data acquisition, data transmission, data calculation and the like, and is mainly influenced by the transmission rate and the transmission precision of a communication network of the DCS and the time and precision of signal processing of modules of the system. The higher the real-time performance of the DCS, the stronger the resolution of data signal change and the higher the data sampling rate, and the requirement of the industrial production process on the rapidity of data receiving and transmitting can be met. Therefore, the real-time performance of the DCS can be accurately diagnosed by testing the real-time performance of the DCS in the aspect of data receiving and sending, and the safety, stability and high efficiency of industrial production process control are guaranteed.
As shown in fig. 3, in the prior art, a document "performance test research on distributed control system of large thermal power generating unit" (liu taimen, etc., guangdong power grid, ltd) published in 2016 and 11 months discloses a common real-time testing method for DCS system, in which a periodically changing triangular wave analog signal is used as a test signal, and a data acquisition instrument is used to record the test signal, a signal received and transmitted by the DCS system, and a signal received and transmitted by the DCS system through network transmission between two controllers.
The technical scheme has the following defects: 1) the method adopts an analog quantity signal which periodically changes in a triangular wave function as a test signal, the signal bandwidth of the test signal is equal to or slightly larger than the scanning period of a measured controller, and according to the Nernst Quit sampling theorem: if the signal bandwidth is less than 2 times of the sampling period, signal distortion can be caused, so that the method is not suitable for real-time testing of the DCS; 2) the analog quantity signal is adopted as a test signal, and the test result can cause the analog quantity signal distortion due to the influence of the scanning period fluctuation and the acquisition precision of a controller, so that the analog quantity signal distortion is difficult to be used for accurately calculating the data loss rate and the delay time of the system; 3) according to the method, test signals are received and sent by the controller 1 in sequence, and the packet receiving rate and the packet sending rate of system data cannot be measured independently, so that the reason of data loss in the real-time performance of the system cannot be determined by the test method; 4) according to the method, two controllers are adopted to simulate network transmission between the controllers, test signals are transmitted through a data network of the controller 1 and received and sent by the measured controller 2 in sequence, and the result cannot distinguish the measurement result of the measured controller 1, so that the real-time performance of the measured controller cannot be reflected.
In addition, a periodically-changed switching value signal is used as a test signal, the signal bandwidth of the test signal is equal to or slightly larger than the scanning period of the measured controller, and the test result is also distorted, so that the phenomenon caused by setting of bandwidth time or system real-time performance cannot be distinguished; in addition, the method calculates the packet receiving rate by setting a counter in the controller to record the number of the received pulses, and cannot distinguish whether the phenomenon of data packet loss is caused by transmission delay or system real-time.
Disclosure of Invention
The invention aims to solve the technical problem of how to design a DCS real-time testing device and method, test the industrial DCS system in real time, accurately diagnose the performance of the DCS system in the aspect of data receiving and sending, and ensure the safety, stability and high efficiency of production process control.
The invention solves the technical problems through the following technical scheme:
a DCS real-time testing device comprises: the device comprises an SOE signal generator (1), an A/D converter (2), a DCS controller (3), a first direct-current power supply (4), a second direct-current power supply (5), an oscilloscope (6), a third direct-current power supply (7) and a fourth direct-current power supply (8); the RJ45 network interface of the SOE signal generator (1) is connected with the RJ45 network interface of the DCS controller (3) in a network transmission mode; a DO switching value output interface of the SOE signal generator (1) is connected with an input end of the A/D converter (2) in a hard-wired transmission mode, and an output end of the A/D converter (2) is connected with a DI switching value input interface of the DCS controller (3) in a hard-wired transmission mode; a first DO switching value output interface of the DCS controller (3) is connected with an input end of a first direct current power supply (4) in a hard-wired transmission mode, an output end of the first direct current power supply (4) is connected with an interface I of the oscilloscope (6) in a hard-wired transmission mode, a second DO switching value output interface of the DCS controller (3) is connected with an input end of a second direct current power supply (5) in a hard-wired transmission mode, and an output end of the second direct current power supply (5) is connected with an interface II of the oscilloscope (6) in a hard-wired transmission mode; the input end of a third direct current power supply (7) is connected between a DO (data only) switching value output interface of the SOE signal generator (1) and the A/D converter (2) in a hard-wired transmission mode, the output end of the third direct current power supply (7) is connected with an interface IV of the oscilloscope (6), the input end of a fourth direct current power supply (8) is connected between the A/D converter (2) and a DI (digital input) switching value input interface of the DCS controller (3) in a hard-wired transmission mode, and the input end of the fourth direct current power supply (8) is connected with an interface III of the oscilloscope (6) in a hard-wired transmission mode.
The testing device integrating the performance tests of the data packet receiving rate, the data packet sending rate, the network transmission delay and the like can quickly, visually and accurately display the measuring result, is convenient for analyzing, counting and calculating the real-time performance of the DCS system, and can distinguish the respective performance of the DCS controller 3 on the data packet receiving rate, the data packet sending rate and the network transmission delay in different transmission modes through a plurality of signal acquisition loops, so that the real-time performance of the DCS controller 3 can be more accurately measured without being interfered by the performance of a controller of a third party.
As a further improvement of the technical scheme of the invention, 10/100M network lines are adopted for the network transmission mode connection, and cables are adopted for the hard-wired transmission mode.
As a further improvement of the technical scheme of the invention, the working principle of the device is as follows:
setting the scanning period of the tested DCS controller (3) as T, and setting all the DC power supply voltages as the same value M;
the SOE signal generator (1) generates a group of pulse signals which change periodically as test signals, the length of the pulse bandwidth is equal to twice of the scanning period of the tested controller, the duty ratio of the signals is 50%, the number of the pulse signals is N, and the frequency of the test signals is not more than one half of the sampling frequency of the DCS controller (3);
the test signal generated by the SOE signal generator (1) is simultaneously transmitted outwards in a network transmission mode and a hard-wired mode; the signal sent in a hard-wired mode is a physical quantity, the physical quantity is divided into two paths, and a first path of physical quantity signal is directly input into a third direct-current power supply (7) and then is connected to an interface IV of an oscilloscope (6) and used for recording an original test signal waveform curve; the second path of physical quantity signal is converted into a digital quantity signal through the A/D converter (2), and then is respectively transmitted to a DI switching value input interface in the DCS controller (3) and an input end of a fourth direct current power supply (8), and then is connected to an interface III of the oscilloscope (6) for recording a data receiving signal waveform curve of the DCS controller (3); the SOE signal generator (1) is transmitted to an RJ45 network interface on the DCS controller (3) through an 10/100M network cable in a network transmission mode; after receiving two paths of test signals, the DCS controller (3) respectively transmits the test signals to two DO switching value output interfaces in the DCS controller (3) through internal configuration logic of the controller, inputs one path of signal in a network transmission mode into a first direct current power supply (4) and then connects into an interface I of an oscilloscope (6) for recording a signal waveform curve after data receiving and transmitting in the mode, inputs one path of signal in a hard-wired transmission mode into a second direct current power supply (5) and then connects into an interface II of the oscilloscope (6) for recording a signal waveform curve after data receiving and transmitting in the mode;
the oscilloscope (6) records the interface I, the interface II and the interface III at the same timeAnd an interface IV four-path input signal which is a data receiving and transmitting signal of a network transmission mode, a data receiving and transmitting signal of a hard-wired transmission mode, a receiving signal of the hard-wired transmission mode and an original test signal of the hard-wired transmission mode respectively, and the packet receiving rate eta of the DCS controller (3) in the hard-wired transmission mode is obtained by calculating respectively through waveform comparative analysis of the four-path signals1Packet sending rate eta of DCS controller (3) in hard-wired transmission mode2DCS controller (3) eta in network transmission mode3The packet reception rate and the network transmission delay time τ.
As a further improvement of the technical scheme of the invention, the method for calculating the packet receiving rate of the DCS controller (3) in the hard-wired transmission mode comprises the following steps: comparing the waveform curves of the original test signal and the data receiving signal, recording the number of waveform pulses of the data receiving signal, and recording as N1Therefore, the packet receiving rate of the DCS controller (3) in the hard-wired transmission mode can be calculated to be
Figure BDA0003119643710000031
Where N represents the number of waveform pulses of the original test signal.
As a further improvement of the technical scheme of the invention, the packet sending rate calculation method of the hard-wired transmission mode DCS controller (3) comprises the following steps: comparing the waveform curves of the received signal in the hard-wired transmission mode and the received signal in the hard-wired transmission mode, recording the number of pulses in the waveform of the received signal in the hard-wired transmission mode as N2(ii) a The DCS controller (3) receives the pulse number N1As the total number of the packets, the packet transmission rate of the hard-wired transmission mode DCS controller (3) is calculated as
Figure BDA0003119643710000041
As a further improvement of the technical solution of the present invention, the method for calculating the packet access rate of the DCS controller (3) in the network transmission mode comprises: recording the number of pulses in the waveform of the network transmission mode transmitting and receiving signals as N3The number of lost packets N obtained by deducting the same transmitted packet1-N2And further calculating to obtain a packet of the DCS controller (3) in the network transmission modeA rate of
Figure BDA0003119643710000042
As a further improvement of the technical solution of the present invention, the method for calculating the network transmission delay time comprises: comparing the waveform curves of the hard-wired transmission mode receiving and transmitting signal and the network transmission mode receiving and transmitting signal, recording the corresponding time when the first pulse in the two waveform curves occurs, and recording the absolute value of the time difference as tau to be used as the network transmission delay time.
A real-time testing method for a DCS comprises the following steps:
s1, setting the scanning period of the tested DCS controller (3) as T, and setting all the direct-current power supply voltages as the same value M;
s2, the SOE signal generator (1) generates a group of pulse signals which change periodically and are used as test signals, the pulse bandwidth length of the test signals is equal to twice of the scanning period of the tested controller, the signal duty ratio is 50%, and the number of the test signals is N;
s3, the test signal generated by the SOE signal generator (1) is simultaneously transmitted outwards in a network transmission mode and a hard-wired mode; the signal sent in a hard-wired mode is a physical quantity, the physical quantity is divided into two paths, and a first path of physical quantity signal is directly input into a third direct-current power supply (7) and then is connected to an interface IV of an oscilloscope (6) and used for recording an original test signal waveform curve; the second path of physical quantity signal is converted into a digital quantity signal through the A/D converter (2), and then is respectively transmitted to a DI switching value input interface in the DCS controller (3) and an input end of a fourth direct current power supply (8), and then is connected to an interface III of the oscilloscope (6) for recording a data receiving signal waveform curve of the DCS controller (3); the SOE signal generator (1) is transmitted to an RJ45 network interface on the DCS controller (3) through an 10/100M network cable in a network transmission mode; after receiving two paths of test signals, the DCS controller (3) respectively transmits the test signals to two DO switching value output interfaces in the DCS controller (3) through internal configuration logic of the controller, inputs one path of signal in a network transmission mode into a first direct current power supply (4) and then connects into an interface I of an oscilloscope (6) for recording a signal waveform curve after data receiving and transmitting in the mode, inputs one path of signal in a hard-wired transmission mode into a second direct current power supply (5) and then connects into an interface II of the oscilloscope (6) for recording a signal waveform curve after data receiving and transmitting in the mode;
s4, oscilloscope (6) records interface I, interface II, interface III and interface IV four input signals, which are network transmission mode data receiving and transmitting signal, hard-wired transmission mode receiving signal and hard-wired transmission mode original test signal, respectively, and calculates and obtains DCS controller (3) packet receiving rate eta in hard-wired transmission mode through wave form comparison analysis of four signals1Packet sending rate eta of DCS controller (3) in hard-wired transmission mode2DCS controller (3) eta in network transmission mode3The packet reception rate and the network transmission delay time τ.
S5, observation eta1、η2、η3Whether the values of the data are all equal to 100% or not, and whether the network transmission delay time tau is smaller than the scanning period T or not is checked, the fact that the current network transmission delay time does not occupy one controller scanning period is indicated, when all the conditions are met, the data can be completely received and sent by the DCS controller (3) in the current scanning period, the data packet loss phenomenon is not caused in network transmission, the real-time performance of the system of the DCS controller (3) meets the requirement, the scanning period of the controller to be tested is continuously reduced, the bandwidth length of the test signal is changed, and the test process from S3 to S5 is repeated; otherwise, if the real-time performance of the system in the current scanning period does not meet the requirement, recording the scanning period of the controller when the last test result meets the requirement as the real-time performance of the current controller.
As a further improvement of the technical scheme of the invention, the method for calculating the packet receiving rate of the DCS controller (3) in the hard-wired transmission mode comprises the following steps: comparing the waveform curves of the original test signal and the data receiving signal, recording the number of waveform pulses of the data receiving signal, and recording as N1Therefore, the packet receiving rate of the DCS controller (3) in the hard-wired transmission mode can be calculated to be
Figure BDA0003119643710000051
Where N represents the number of waveform pulses of the original test signal；
The packet sending rate calculation method of the hard-wired transmission mode DCS controller (3) comprises the following steps: comparing the waveform curves of the received signal in the hard-wired transmission mode and the received signal in the hard-wired transmission mode, recording the number of pulses in the waveform of the received signal in the hard-wired transmission mode as N2(ii) a The DCS controller (3) receives the pulse number N1As the total number of the packets, the packet transmission rate of the hard-wired transmission mode DCS controller (3) is calculated as
Figure BDA0003119643710000052
The method for calculating the packet receiving rate of the DCS controller (3) in the network transmission mode comprises the following steps: recording the number of pulses in the waveform of the network transmission mode transmitting and receiving signals as N3The number of lost packets N obtained by deducting the same transmitted packet1-N2And further calculating the packet receiving rate of the DCS controller (3) in the network transmission mode to be
Figure BDA0003119643710000053
As a further improvement of the technical solution of the present invention, the method for calculating the network transmission delay time comprises: comparing the waveform curves of the hard-wired transmission mode receiving and transmitting signal and the network transmission mode receiving and transmitting signal, recording the corresponding time when the first pulse in the two waveform curves occurs, and recording the absolute value of the time difference as tau to be used as the network transmission delay time.
The invention has the advantages that:
1) the invention provides a novel real-time testing device of a DCS, which adopts a pulse signal with periodic change as a testing signal, wherein the bandwidth time of the pulse signal is set to be 2 times of the scanning period of a tested controller, so that the problem of measurement result distortion caused by the fact that the pulse bandwidth time is close to the scanning period of the controller is avoided, and the real-time testing result of the DCS is influenced; meanwhile, the pulse signal is adopted as the test signal, compared with an analog signal, the problem of signal distortion caused by factors such as the scanning period fluctuation of a controller is not easy to occur, and therefore the test result precision of the invention is higher.
2) The DCS real-time testing device provided by the invention can simultaneously record network transmission mode data transceiving signals, hard-wired transmission mode received signals and original testing signals, and directly carry out data observation, statistics and calculation through the testing result, so that the phenomenon that the data packet loss of the testing result is caused by network delay or system real-time is conveniently distinguished, and the testing precision is improved.
3) The invention provides a novel real-time testing method for a DCS, which can quickly and accurately calculate the data packet receiving rate in a network transmission mode and a hard-wired transmission mode, the data packet sending rate in the hard-wired transmission mode and the network transmission delay time, so that the real-time of the DCS with higher precision is obtained.
4) According to the invention, through the comparison and analysis of the four received signals, the data packet receiving rate of the DCS in a network transmission mode and a hard-wired transmission mode, the data packet receiving rate and the data packet sending rate in the hard-wired transmission mode and the network transmission delay time can be measured independently, so that the main factors influencing the real-time performance of the DCS can be evaluated accurately;
5) the invention does not need to realize data network transmission through two controllers, thereby avoiding the interference of the performance of the other controller on the real-time test result of the tested controller and improving the precision of the test result.
Drawings
Fig. 1 is a structural diagram of a DCS system real-time performance testing apparatus according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for testing real-time performance of a DCS system according to a first embodiment of the present invention;
fig. 3 is a prior art test method.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification:
example one
As shown in fig. 1, a DCS system real-time performance testing apparatus includes: the device comprises an SOE signal generator 1, an A/D converter 2, a DCS controller 3, a first direct current power supply 4, a second direct current power supply 5, an oscilloscope 6, a third direct current power supply 7 and a fourth direct current power supply 8.
The RJ45 network interface of the SOE signal generator 1 is connected with the RJ45 network interface of the DCS controller 3 by a 10/100M network cable; a DO switching value output interface of the SOE signal generator 1 is connected with an input end of the A/D converter 2 through a cable, and an output end of the A/D converter 2 is connected with a DI switching value input interface of the DCS controller 3 through a cable; a first DO switching value output interface of the DCS controller 3 is connected with an input end of a first direct current power supply 4 through a cable, an output end of the first direct current power supply 4 is connected with an interface I of the oscilloscope 6 through a cable, a second DO switching value output interface of the DCS controller 3 is connected with an input end of a second direct current power supply 5 through a cable, and an output end of the second direct current power supply 5 is connected with an interface II of the oscilloscope 6 through a cable; the input end of a third direct current power supply 7 is connected between a DO switching value output interface of the SOE signal generator 1 and the A/D converter 2 through a cable, the output end of the third direct current power supply 7 is connected between an interface IV of the oscilloscope 6 through a cable, the input end of a fourth direct current power supply 8 is connected between the A/D converter 2 and a DI switching value input interface of the DCS controller 3 through a cable, and the input end of the fourth direct current power supply 8 is connected between an interface III of the oscilloscope 6 through a cable.
The testing device integrating the performance tests of the data packet receiving rate, the data packet sending rate, the network transmission delay and the like can quickly, visually and accurately display the measuring result, is convenient for analyzing, counting and calculating the real-time performance of the DCS system, and can distinguish the respective performance of the DCS controller 3 on the data packet receiving rate, the data packet sending rate and the network transmission delay in different transmission modes through a plurality of signal acquisition loops, so that the real-time performance of the DCS controller 3 can be more accurately measured without being interfered by the performance of a controller of a third party.
The working principle of the DCS real-time testing device is as follows:
(1) setting the scanning period of the tested DCS controller 3 as T; a periodically-changed pulse signal is used as a test signal, the length of a pulse bandwidth is greater than the scanning period of a measured controller, the problem of data acquisition distortion caused by the fact that the time of the pulse bandwidth is close to the scanning period of the controller is solved, and the real-time test result of the DCS is influenced; meanwhile, the pulse signal is adopted as the test signal, compared with an analog signal, the problem of signal distortion caused by factors such as the scanning period fluctuation of a controller is not easy to occur, and the precision of the test result is higher.
(2) Setting all the direct-current power supply voltages to be the same value M, so that each signal can be conveniently compared and analyzed;
(3) the SOE signal generator 1 generates a group of pulse signals which change periodically as test signals, the length of the pulse bandwidth is equal to two times (namely 2T) of the scanning period of the tested controller, the duty ratio of the signals is 50%, the number of the pulses is N, the frequency of the test signals is not more than one half of the sampling frequency of the DCS controller 3, and the phenomenon of signal distortion is prevented;
(4) the test signal generated by the SOE signal generator 1 is simultaneously transmitted outwards in a network transmission mode and a hard-wired mode; the signal sent in the hard wiring mode is a physical quantity, the physical quantity is divided into two paths, and a first path of physical quantity signal is directly input into a third direct current power supply 7 and then connected to an interface IV of an oscilloscope 6 and used for recording the waveform curve of an original test signal; the second path of physical quantity signal is converted into a digital quantity signal through the A/D converter 2, and then is respectively transmitted to a DI switching value input interface in the DCS controller 3 and an input end of a fourth direct current power supply 8, and then is connected to an interface III of the oscilloscope 6, and is used for recording a data receiving signal waveform curve of the DCS controller 3; the SOE signal generator 1 is transmitted to an RJ45 network interface on the DCS controller 3 through an 10/100M network cable in a network transmission mode;
(5) after receiving two paths of test signals, the DCS controller 3 respectively transmits the test signals to two DO switching value output interfaces in the DCS controller 3 through the internal configuration logic of the controller, one path of signal in a network transmission mode is input into a first direct current power supply 4 and then connected into an interface I of an oscilloscope 6 for recording a signal waveform curve after data receiving and transmitting in the mode, one path of signal in a hard-wired transmission mode is input into a second direct current power supply 5 and then connected into an interface II of the oscilloscope 6 for recording a signal waveform curve after data receiving and transmitting in the mode;
(6) the oscilloscope 6 simultaneously records four input signals of an interface I, an interface II, an interface III and an interface IV, which are respectively a signal after data transmitting and receiving through a network, a signal after data transmitting and receiving through hard wiring, a data receiving signal through hard wiring and an original test signal; respectively obtaining respective packet receiving rate, packet sending rate and network transmission delay time through waveform comparative analysis of the four paths of signals;
(7) reducing the scanning period of the DCS controller 3, synchronously changing the signal bandwidth length of the SOE signal generator 1, retesting, respectively recording four input signals of an interface I, an interface II, an interface III and an interface IV by the oscilloscope 6, and analyzing to obtain the data packet receiving rate, the network transmission delay time and the data packet sending rate of the DCS controller 3 in the current scanning period of the controller;
(8) further reducing the scanning period of the DCS controller 3, and repeating the test until the DCS controller 3 can correctly detect the minimum scanning period required under the test signal change state, namely determining the minimum scanning period as the real-time performance of the system.
Example two
As shown in fig. 2, a method for testing real-time performance of a DCS system includes the following steps:
first, the scan period of the DCS controller 3 under test is set to T.
Second, all the dc power supply voltages are set to the same value M.
Thirdly, setting parameters of the SOE signal generator 1 to generate a test signal with the pulse number of N, the pulse bandwidth length of 2T and the duty ratio of 50%.
Fourthly, the test signals are sent to the oscilloscope 6 to record the waveform curve after passing through four paths at the same time, and are respectively a network transmission mode data transceiving signal, a hard-wired transmission mode receiving signal and an original test signal.
Fifthly, comparing and analyzing the waveform curves of the four paths of signals through an oscilloscope 6 to obtain the data packet receiving rate, the packet sending rate and the network transmission delay time of the DCS controller 3 in different transmission modes; the specific method comprises the following steps:
1) comparing the waveform curves of the original test signal and the received signal in the hard-wired transmission mode, recording the number of pulses of the waveform of the received signal in the hard-wired transmission mode, and recording as N1Thus, the packet receiving rate of the DCS controller 3 in the hard-wired transmission mode can be calculated as
Figure BDA0003119643710000091
2) Comparing the waveform curves of the received signal in the hard-wired transmission mode and the received signal in the hard-wired transmission mode, recording the number of pulses in the waveform of the received signal in the hard-wired transmission mode as N2(ii) a DCS controller 3 receives the pulse number N1As the total number of packets, the packet transmission rate of the hard-wired transmission DCS controller 3 is calculated as
Figure BDA0003119643710000092
3) Comparing waveform curves of the hard-wired transmission mode transceiving signals and the network transmission mode transceiving signals, recording corresponding time when the first pulse in the two waveform curves occurs, and recording the absolute value of the time difference as tau to be used as network transmission delay time; recording the number of pulses in the waveform of the network transmission mode transmitting and receiving signals as N3Because the two packet receiving modes are different and the packet sending mode is the same, the packet loss number N is deducted when the same packet is sent1-N2And further calculating the packet receiving rate of the DCS controller 3 in the network transmission mode to be
Figure BDA0003119643710000093
Sixth, observe η1、η2、η3Whether the numerical values of the data transmission delay time and the data transmission delay time are all equal to 100% or not, whether the network transmission delay time tau is smaller than the scanning period T or not is checked, the fact that the current network transmission delay time does not occupy one controller scanning period is indicated, when all the conditions are met, the data can be completely received and sent by the DCS controller 3 in the current scanning period, the data packet loss phenomenon is not caused by network transmission, the real-time performance of the DCS controller 3 system meets the requirement, the scanning period of the tested controller is continuously reduced, the bandwidth length of a test signal is changed, and the test process from the fourth step to the sixth step is repeated; otherwise, if the real-time performance of the system in the current scanning period does not meet the requirement, recording the scanning period of the controller when the last test result meets the requirement as the real-time performance of the current controller.
The real-time performance of the DCS is an important performance of the DCS, reflects the processing capacity of the DCS in the links of data acquisition, data transmission, data calculation and the like, and is used for evaluating whether the DCS can meet the requirements of the links of data acquisition, transmission, display, calculation and the like in the industrial production process. The higher the real-time performance of the DCS system is, the higher the real-time performance of the DCS system represents that the system can detect data signals with higher change speed. The real-time performance of the DCS comprises the characteristics of controlling the network data transmission delay and the data receiving and transmitting accuracy. The method comprises the steps of designing a high-precision, continuous and adjustable test signal, integrating control network data transmission and data receiving and sending into a whole test loop, detecting the real-time performance of the DCS in the aspects of data transmission and data receiving and sending, obtaining a test result of the real-time performance of the system, and obtaining the minimum duration time required by the DCS in the condition that the change state of the test signal can be correctly detected, namely determining the minimum duration time as the real-time performance of the system.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1.一种DCS系统实时性测试装置，其特征在于，包括：SOE信号发生器(1)、A/D转换器(2)、DCS控制器(3)、第一直流电源(4)、第二直流电源(5)、示波器(6)、第三直流电源(7)、第四直流电源(8)；SOE信号发生器(1)的RJ45网络接口与DCS控制器(3)的RJ45网络接口之间采用网络传输方式连接；SOE信号发生器(1)的DO开关量输出接口与A/D转换器(2)输入端采用硬接线传输方式连接，A/D转换器(2)的输出端与DCS控制器(3)的DI开关量输入接口采用硬接线传输方式连接；DCS控制器(3)的第一DO开关量输出接口与第一直流电源(4)的输入端采用硬接线传输方式连接，第一直流电源(4)的输出端与示波器(6)的接口Ⅰ采用硬接线传输方式连接，DCS控制器(3)的第二DO开关量输出接口与第二直流电源(5)的输入端采用硬接线传输方式连接，第二直流电源(5)的输出端与示波器(6)的接口Ⅱ采用硬接线传输方式连接；第三直流电源(7)的输入端采用硬接线传输方式连接在SOE信号发生器(1)的DO开关量输出接口与A/D转换器(2)之间，第三直流电源(7)的输出端连接在示波器(6)的接口Ⅳ，第四直流电源(8)的输入端采用硬接线传输方式连接在A/D转换器(2)与DCS控制器(3)的DI开关量输入接口之间，第四直流电源(8)的输入端采用硬接线传输方式连接在示波器(6)的接口Ⅲ。1. A DCS system real-time testing device is characterized in that, comprising: SOE signal generator (1), A/D converter (2), DCS controller (3), first DC power supply (4), The second DC power supply (5), the oscilloscope (6), the third DC power supply (7), the fourth DC power supply (8); the RJ45 network interface of the SOE signal generator (1) and the RJ45 network of the DCS controller (3) The interfaces are connected by network transmission; the DO switch output interface of the SOE signal generator (1) is connected with the input end of the A/D converter (2) by hard-wired transmission, and the output of the A/D converter (2) is connected by means of hard-wired transmission. The terminal is connected with the DI digital input interface of the DCS controller (3) in a hard-wired transmission mode; the first DO digital output interface of the DCS controller (3) and the input terminal of the first DC power supply (4) are connected by hard wiring The transmission mode is connected, the output end of the first DC power supply (4) and the interface I of the oscilloscope (6) are connected in a hard-wired transmission mode, and the second DO switch output interface of the DCS controller (3) is connected to the second DC power supply ( The input end of 5) is connected by hard-wired transmission, the output end of the second DC power supply (5) is connected with the interface II of the oscilloscope (6) by hard-wired transmission; the input end of the third DC power supply (7) is connected by hard-wired The transmission mode is connected between the DO switch output interface of the SOE signal generator (1) and the A/D converter (2), and the output end of the third DC power supply (7) is connected to the interface IV of the oscilloscope (6). The input terminals of the four DC power supplies (8) are connected between the A/D converter (2) and the DI digital input interface of the DCS controller (3) by means of hard-wired transmission, and the input terminals of the fourth DC power supply (8) It is connected to the interface III of the oscilloscope (6) by means of hard-wired transmission. 2.根据权利要求1所述的一种DCS系统实时性测试装置，其特征在于，所述的网络传输方式连接采用10/100M网线，所述的硬接线传输方式采用电缆。2. A kind of real-time testing device of DCS system according to claim 1, is characterized in that, described network transmission mode connection adopts 10/100M network cable, and described hard-wired transmission mode adopts cable. 3.根据权利要求2所述的一种DCS系统实时性测试装置，其特征在于，装置的工作原理如下：3. a kind of DCS system real-time testing device according to claim 2, is characterized in that, the working principle of device is as follows: 设置被测DCS控制器(3)的扫描周期为T，将所有直流电源电压设置为相同数值M；Set the scan period of the tested DCS controller (3) to T, and set all DC power supply voltages to the same value M; SOE信号发生器(1)产生一组周期性变化的脉冲信号作为测试信号，其脉冲带宽长度等于被测控制器扫描周期的两倍，其信号占空比为50％，脉冲数量为N，保证测试信号频率不大于DCS控制器(3)采样频率的二分之一；The SOE signal generator (1) generates a group of periodically changing pulse signals as test signals, the pulse bandwidth length is equal to twice the scan period of the controller under test, the signal duty cycle is 50%, and the number of pulses is N, to ensure that The test signal frequency is not more than half of the sampling frequency of the DCS controller (3); SOE信号发生器(1)产生的测试信号以网络传输方式和硬接线方式同时向外传输；其中以硬接线方式发送的信号是物理量，物理量分为两路，第一路物理量信号直接输入第三直流电源(7)后接至示波器(6)接口Ⅳ，用于记录原始测试信号波形曲线；第二路物理量信号通过A/D转换器(2)转化为数字量信号后，分别传输至DCS控制器(3)中的DI开关量输入接口以及第四直流电源(8)的输入端后再接至示波器(6)接口Ⅲ中，用于记录DCS控制器(3)数据接收信号波形曲线；SOE信号发生器(1)以网络传输方式经10/100M网线传输至DCS控制器(3)上的RJ45网络接口；DCS控制器(3)接收到两路测试信号后，分别通过控制器内部组态逻辑传输至DCS控制器(3)中的两个DO开关量输出接口，以网络传输方式的一路信号输入第一直流电源(4)后再接至示波器(6)接口I中，用于记录该方式下数据收发后信号波形曲线，以硬接线传输方式的一路信号输入第二直流电源(5)后再接至示波器(6)接口II中，用于记录该方式下数据收发后信号波形曲线；The test signal generated by the SOE signal generator (1) is transmitted to the outside by the network transmission method and the hard-wired method at the same time; the signal sent by the hard-wired method is a physical quantity, and the physical quantity is divided into two channels. The first physical quantity signal is directly input to the third channel. The DC power supply (7) is then connected to the interface IV of the oscilloscope (6), which is used to record the waveform curve of the original test signal; the second physical quantity signal is converted into a digital signal by the A/D converter (2), and then transmitted to the DCS control respectively. The DI digital input interface in the controller (3) and the input terminal of the fourth DC power supply (8) are then connected to the oscilloscope (6) interface III, which is used to record the data receiving signal waveform curve of the DCS controller (3); SOE The signal generator (1) is transmitted to the RJ45 network interface on the DCS controller (3) via the 10/100M network cable in the network transmission mode; after the DCS controller (3) receives the two test signals, it configures the internal configuration of the controller respectively. The logic is transmitted to the two DO switch output interfaces in the DCS controller (3), and is input to the first DC power supply (4) with a signal of the network transmission mode and then connected to the interface I of the oscilloscope (6) for recording In this mode, the signal waveform curve after data transmission and reception is input to the second DC power supply (5) with one signal in the hard-wired transmission mode, and then connected to the oscilloscope (6) interface II, which is used to record the signal waveform curve after data transmission and reception in this mode. ; 示波器(6)同时记录下接口I、接口II、接口III和接口IV四路输入信号，分别为网络传输方式的数据收发信号、硬接线传输方式的数据收发信号、硬接线传输方式的接收信号和硬接线传输方式的原始测试信号，通过四路信号的波形对比分析，分别计算得到硬接线传输方式下DCS控制器(3)的接包率η1、硬接线传输方式DCS控制器(3)的发包率η2、网络传输方式下DCS控制器(3)η3的接包率以及网络传输迟延时间τ。The oscilloscope (6) simultaneously records the four input signals of interface I, interface II, interface III and interface IV, which are the data sending and receiving signals of the network transmission method, the data sending and receiving signals of the hard-wired transmission method, the received signals of the hard-wired transmission method and The original test signal of the hard-wired transmission mode, through the comparative analysis of the waveforms of the four-way signals, the packet receiving rate η 1 of the DCS controller (3) in the hard-wired transmission mode and the DCS controller (3) in the hard-wired transmission mode are calculated respectively. The packet sending rate η 2 , the packet receiving rate of the DCS controller (3) η 3 in the network transmission mode, and the network transmission delay time τ. 4.根据权利要求3所述的一种DCS系统实时性测试装置，其特征在于，所述的硬接线传输方式下DCS控制器(3)的接包率的计算方法为：对比原始测试信号和数据接收信号的波形曲线，记录数据接收信号的波形脉冲个数，记为N1，由此可计算出硬接线传输方式下DCS控制器(3)的接包率为
Figure FDA0003119643700000021
其中N表示原始测试信号的波形脉冲个数。4. a kind of DCS system real-time testing device according to claim 3, is characterized in that, the calculation method of the packet rate of DCS controller (3) under described hard-wired transmission mode is: contrast original test signal and The waveform curve of the data receiving signal, record the number of waveform pulses of the data receiving signal, denoted as N 1 , from which the packet receiving rate of the DCS controller (3) in the hard-wired transmission mode can be calculated.
Figure FDA0003119643700000021
Among them, N represents the number of waveform pulses of the original test signal. 5.根据权利要求4所述的一种DCS系统实时性测试装置，其特征在于，所述的硬接线传输方式DCS控制器(3)的发包率的计算方法为：对比硬接线传输方式接收信号与硬接线传输方式收发信号的波形曲线，记录硬接线传输方式收发信号波形中的脉冲个数，记为N2；DCS控制器(3)将接收到的脉冲数N1作为发包总数，由此计算出硬接线传输方式DCS控制器(3)的发包率为
Figure FDA0003119643700000022
5. a kind of DCS system real-time testing device according to claim 4, is characterized in that, the calculation method of the packet rate of described hard-wired transmission mode DCS controller (3) is: contrast hard-wired transmission mode to receive signals With the waveform curve of the signal sent and received in the hard-wired transmission mode, record the number of pulses in the waveform of the transmitted and received signals in the hard-wired transmission mode, denoted as N 2 ; the DCS controller (3) takes the received pulse number N 1 as the total number of packets, thus Calculate the packet sending rate of the DCS controller (3) in the hard-wired transmission mode
Figure FDA0003119643700000022
 6.根据权利要求5所述的一种DCS系统实时性测试装置，其特征在于，所述的网络传输方式下DCS控制器(3)的接包率的计算方法为：记录网络传输方式收发信号波形中的脉冲个数，记为N3，扣除相同的发包时的丢包数N1-N2，进而计算得出网络传输方式下DCS控制器(3)的接包率为
Figure FDA0003119643700000023
6. a kind of DCS system real-time testing device according to claim 5, is characterized in that, the calculation method of the packet rate of DCS controller (3) under described network transmission mode is: record network transmission mode to send and receive signals The number of pulses in the waveform is denoted as N 3 , after deducting the same number of lost packets N 1 -N 2 when sending packets, and then calculating the packet receiving rate of the DCS controller (3) in the network transmission mode
Figure FDA0003119643700000023
 7.根据权利要求3所述的一种DCS系统实时性测试装置，其特征在于，所述的网络传输迟延时间的计算方法为：对比硬接线传输方式收发信号与网络传输方式收发信号的波形曲线，记录两个波形曲线中第一个脉冲发生时所对应的时刻，其时间差值绝对值记作τ，作为网络传输迟延时间。7. a kind of DCS system real-time testing device according to claim 3, is characterized in that, the calculation method of described network transmission delay time is: contrast the waveform curve of hard-wired transmission mode sending and receiving signals and network transmission mode sending and receiving signals , record the time corresponding to the occurrence of the first pulse in the two waveforms, and the absolute value of the time difference is recorded as τ, which is used as the network transmission delay time. 8.一种DCS系统实时性测试方法，其特征在于，包括如下步骤：8. a DCS system real-time testing method, is characterized in that, comprises the steps: S1、设置被测DCS控制器(3)的扫描周期为T，将所有直流电源电压设置为相同数值M；S1. Set the scan period of the DCS controller (3) under test to T, and set all DC power supply voltages to the same value M; S2、SOE信号发生器(1)产生一组周期性变化的脉冲信号作为测试信号，其脉冲带宽长度等于被测控制器扫描周期的两倍，其信号占空比为50％，数量为N；S2. The SOE signal generator (1) generates a group of periodically changing pulse signals as test signals, the pulse bandwidth length is equal to twice the scanning period of the controller under test, the signal duty cycle is 50%, and the number is N; S3、SOE信号发生器(1)产生的测试信号以网络传输方式和硬接线方式同时向外传输；其中以硬接线方式发送的信号是物理量，物理量分为两路，第一路物理量信号直接输入第三直流电源(7)后接至示波器(6)接口IV，用于记录原始测试信号波形曲线；第二路物理量信号通过A/D转换器(2)转化为数字量信号后，分别传输至DCS控制器(3)中的DI开关量输入接口以及第四直流电源(8)的输入端后再接至示波器(6)接口III中，用于记录DCS控制器(3)数据接收信号波形曲线；SOE信号发生器(1)以网络传输方式经10/100M网线传输至DCS控制器(3)上的RJ45网络接口；DCS控制器(3)接收到两路测试信号后，分别通过控制器内部组态逻辑传输至DCS控制器(3)中的两个DO开关量输出接口，以网络传输方式的一路信号输入第一直流电源(4)后再接至示波器(6)接口I中，用于记录该方式下数据收发后信号波形曲线，以硬接线传输方式的一路信号输入第二直流电源(5)后再接至示波器(6)接口II中，用于记录该方式下数据收发后信号波形曲线；S3. The test signal generated by the SOE signal generator (1) is transmitted to the outside at the same time by the network transmission method and the hard-wired method; the signal sent by the hard-wired method is a physical quantity, and the physical quantity is divided into two channels, and the first physical quantity signal is directly input. The third DC power supply (7) is then connected to the interface IV of the oscilloscope (6) for recording the waveform curve of the original test signal; after the second physical quantity signal is converted into a digital quantity signal by the A/D converter (2), it is respectively transmitted to the The DI digital input interface in the DCS controller (3) and the input terminal of the fourth DC power supply (8) are then connected to the interface III of the oscilloscope (6) for recording the data receiving signal waveform curve of the DCS controller (3). ; The SOE signal generator (1) transmits to the RJ45 network interface on the DCS controller (3) via the 10/100M network cable in the network transmission mode; after the DCS controller (3) receives the two test signals, the The configuration logic is transmitted to the two DO switch value output interfaces in the DCS controller (3), and is input to the first DC power supply (4) with a signal of the network transmission mode, and then connected to the interface I of the oscilloscope (6), using In this mode, the signal waveform curve after data transmission and reception is recorded, input one signal in the hard-wired transmission mode into the second DC power supply (5) and then connect it to the oscilloscope (6) interface II to record the signal after data transmission and reception in this mode waveform curve; S4、示波器(6)同时记录下接口I、接口II、接口III和接口IV四路输入信号，分别为网络传输方式的数据收发信号、硬接线传输方式的数据收发信号、硬接线传输方式的接收信号和硬接线传输方式的原始测试信号，通过四路信号的波形对比分析，分别计算得到硬接线传输方式下DCS控制器(3)的接包率η1、硬接线传输方式DCS控制器(3)的发包率η2、网络传输方式下DCS控制器(3)η3的接包率以及网络传输迟延时间τ。S4. The oscilloscope (6) simultaneously records four input signals of interface I, interface II, interface III and interface IV, which are the data sending and receiving signals of the network transmission method, the data sending and receiving signals of the hard-wired transmission method, and the reception of the hard-wired transmission method. Signal and the original test signal of the hard-wired transmission mode, through the comparative analysis of the waveforms of the four-way signals, the packet receiving rate η 1 of the DCS controller (3) in the hard-wired transmission mode and the DCS controller (3) in the hard-wired transmission mode are calculated respectively. ) of the packet sending rate η 2 , the packet receiving rate of the DCS controller (3) η 3 under the network transmission mode, and the network transmission delay time τ. S5、观察η1、η2、η3的数值是否都等于100％，以及检查网络传输迟延时间τ是否小于扫描周期T，表示当前网络传输迟延时间不占用一个控制器扫描周期，当满足以上所有条件时，代表DCS控制器(3)在当前扫描周期下，能够完整地接收和发送数据，网络传输未造成数据丢包现象，DCS控制器(3)系统实时性满足要求，继续减小被测控制器的扫描周期，改变测试信号带宽长度，重复S3至S5的测试过程；否则，当前扫描周期下的系统实时性不满足要求，则将上一次测试结果满足要求时的控制器扫描周期记为当前控制器的实时性。S5. Observe whether the values of η 1 , η 2 , and η 3 are all equal to 100%, and check whether the network transmission delay time τ is less than the scan period T, indicating that the current network transmission delay time does not occupy a controller scan period, when all the above are satisfied condition, it means that the DCS controller (3) can completely receive and send data under the current scanning cycle, the network transmission does not cause data packet loss, the real-time performance of the DCS controller (3) system meets the requirements, and the measured The scan cycle of the controller, change the bandwidth length of the test signal, and repeat the test process from S3 to S5; otherwise, if the real-time performance of the system under the current scan cycle does not meet the requirements, the controller scan cycle when the last test result meets the requirements is recorded as The real-time nature of the current controller. 9.根据权利要求8所述的一种DCS系统实时性测试方法，其特征在于，所述的硬接线传输方式下DCS控制器(3)的接包率的计算方法为：对比原始测试信号和数据接收信号的波形曲线，记录数据接收信号的波形脉冲个数，记为N1，由此可计算出硬接线传输方式下DCS控制器(3)的接包率为
Figure FDA0003119643700000041
其中N表示原始测试信号的波形脉冲个数；9. a kind of DCS system real-time testing method according to claim 8, is characterized in that, the calculation method of the packet rate of DCS controller (3) under described hard-wired transmission mode is: contrast original test signal and The waveform curve of the data receiving signal, record the number of waveform pulses of the data receiving signal, denoted as N 1 , from which the packet receiving rate of the DCS controller (3) in the hard-wired transmission mode can be calculated.
Figure FDA0003119643700000041
Among them, N represents the number of waveform pulses of the original test signal; 所述的硬接线传输方式DCS控制器(3)的发包率的计算方法为：对比硬接线传输方式接收信号与硬接线传输方式收发信号的波形曲线，记录硬接线传输方式收发信号波形中的脉冲个数，记为N2；DCS控制器(3)将接收到的脉冲数N1作为发包总数，由此计算出硬接线传输方式DCS控制器(3)的发包率为
Figure FDA0003119643700000042
The method for calculating the packet sending rate of the DCS controller (3) in the hard-wired transmission mode is as follows: comparing the waveform curves of the received signals in the hard-wired transmission mode and the received and received signals in the hard-wired transmission mode, and recording the pulses in the waveforms of the received and received signals in the hard-wired transmission mode The number is denoted as N 2 ; the DCS controller (3) takes the received pulse number N 1 as the total number of packets sent, thereby calculating the packet sending rate of the DCS controller (3) in the hard-wired transmission mode
Figure FDA0003119643700000042
 所述的网络传输方式下DCS控制器(3)的接包率的计算方法为：记录网络传输方式收发信号波形中的脉冲个数，记为N3，扣除相同的发包时的丢包数N1-N2，进而计算得出网络传输方式下DCS控制器(3)的接包率为
Figure FDA0003119643700000043
The calculation method of the packet receiving rate of the DCS controller (3) in the network transmission mode is: record the number of pulses in the signal waveform of the network transmission mode sending and receiving signals, denoted as N 3 , and deduct the number of lost packets N when the same packet is sent. 1 -N 2 , and then calculate the packet receiving rate of the DCS controller (3) in the network transmission mode
Figure FDA0003119643700000043
 10.根据权利要求9所述的一种DCS系统实时性测试方法，其特征在于，所述的网络传输迟延时间的计算方法为：对比硬接线传输方式收发信号与网络传输方式收发信号的波形曲线，记录两个波形曲线中第一个脉冲发生时所对应的时刻，其时间差值绝对值记作τ，作为网络传输迟延时间。10. a kind of DCS system real-time testing method according to claim 9, is characterized in that, the calculation method of described network transmission delay time is: contrast the waveform curve of hard-wired transmission mode sending and receiving signals and network transmission mode sending and receiving signals , record the time corresponding to the occurrence of the first pulse in the two waveforms, and the absolute value of the time difference is recorded as τ, which is used as the network transmission delay time.
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