CN110827350B - Tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols - Google Patents

Tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols Download PDF

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CN110827350B
CN110827350B CN201911260718.3A CN201911260718A CN110827350B CN 110827350 B CN110827350 B CN 110827350B CN 201911260718 A CN201911260718 A CN 201911260718A CN 110827350 B CN110827350 B CN 110827350B
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陈林
苏兆路
王东平
董立伟
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Cccc First Public Bureau Electrification Engineering Co ltd
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    • G06T7/00—Image analysis
    • G06T7/70—Determining position or orientation of objects or cameras
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    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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    • G06T7/0002—Inspection of images, e.g. flaw detection
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    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
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    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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    • G06T2207/20048—Transform domain processing
    • G06T2207/20064—Wavelet transform [DWT]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The invention discloses a real-time data acquisition system based on Labview and Modbus/TCP communication protocols, which comprises a main communication module and a data processing and storing module, wherein an Ethernet communication program, a database access reading program and a graphic waveform display control in a Labview function library are adopted in a foreground page based on a Labview software queue message processor template, a MySQL database is adopted in a rear-end database to construct a big data processing and technical service mode, and compared with the traditional human-computer interface development, the system development step is simpler, and compared with serial port communication, the Ethernet network has wide range, good compatibility and strong anti-interference capability, and the practical application requirements of large data communication quantity, high-efficiency transmission and the like of the system are met. The system is installed on an industrial computer, can be independently debugged and operated, establishes communication connection with a vehicle section energy management system through a TCP/IP protocol, acquires corresponding energy consumption data through a question-answer transmission protocol Modbus, and provides powerful support for energy consumption management of a modern tram.

Description

Tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols
Technical Field
The invention belongs to the technical field of tramcar energy-saving management, and particularly relates to a tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols.
Background
With the continuous promotion of urban design in China in recent years, urban population is continuously increased, and many cities face the problems of environmental pollution, energy shortage, traffic jam and the like, so that urban rail transit such as subways, light rails, modern trams and the like can be effectively relieved. Modern tramcars are used as the first choice for developing urban public transportation in many small and medium-sized cities with the advantages of environmental protection, energy conservation, low noise, low construction cost and the like. However, due to the fact that the passenger capacity is large, an effective energy-saving management scheme is lacked, and the like, the energy consumption of the operation of a modern tramcar is relatively large, the proportion of the energy consumption of the operation of the tramcar to the operation cost is very high, and the energy-saving management problem of the tramcar is increasingly outstanding. In order to realize effective management of vehicle energy consumption, a high-efficiency and stable data acquisition system needs to be developed and a corresponding database is perfected. In the development process of the traditional human-machine interface (HMI), a Modbus I/O server needs to be established, the development steps are complex, in addition, the serial port communication self-adaption is poor, and the communication efficiency is low.
Based on the energy-saving management system of the modern tram, a modern tram data acquisition system based on Labview and Modbus/TCP communication protocols is developed. The system is developed in a LabVIEW environment, fully utilizes the advantages of high reliability and low cost of a Modbus/TCP communication protocol on the basis of a powerful graphical user interface (graphical user interface, GUI) of a computer, records the data of the modern tram in operation, and provides an effective solution for the real-time data monitoring and networking communication of the tram.
Disclosure of Invention
Aiming at the defects pointed out in the background technology, the invention provides a tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols, which aims to solve the problems in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols comprises a main communication module and a data processing and saving module, wherein the modules are based on Labview software queue message processor templates, a foreground page adopts an Ethernet communication program, a database access reading program and a graphic waveform display control in a Labview function library, a rear-end database adopts a MySQL database to construct a big data processing and technical service mode, the system is installed on an industrial computer, and the programs of the main communication module and the data processing and saving module are as follows:
(1) Main communication module
After the TCP connection is successful, modbus communication is carried out, and register data are obtained; converting the read holding register data into Modbus data units through MB Modbus Command to Unit.vi, transmitting the Modbus data units on the Ethernet according to a set message header format through MB Ethernet transmit.vi, receiving the Modbus data units through MB Ethernet receive.vi, and closing TCP connection at the same time; the MB decoder data.vi compares the data requested to be sent with the Modbus data units received, stores the received data into a holding register, and finally obtains the data required by the system through an index array function;
(2) Data processing and storing module
(1) Design of data form fields
Establishing an energy consumption data table in the mysql database, wherein the vehicle energy consumption data table comprises: six fields including a main key, a station name, charging voltage, charging current, vehicle energy consumption and acquisition time;
(2) data storage programming
Storing the real-time energy consumption data acquired by the acquisition module into a created table of the mysql database, establishing a system connection with the database through an account and a password of the database, and storing the data to be stored into a field appointed by the table by utilizing SQL insert sentences;
(3) updating of database tables
The daily energy consumption data are stored in different database tables, the tables are named as 'operation energy consumption' + 'date', and SQL sentences are written to create new data tables, so that the daily energy consumption data are stored in the appointed tables.
Preferably, the communication process of the Modbus/TCP protocol comprises three stages, wherein the first stage is that a modern tram energy-saving management system is used as a communication main end of the Modbus/TCP, the communication connection with the energy management system is actively initiated by setting an IP address and a port, the energy management system is used as a slave end of the communication, the energy management system waits for and receives a connection request of the main end, and both sides establish reliable TCP connection; the second stage is that the communication master terminal sends a first data request to the communication slave terminal, after waiting for the response of the communication slave terminal, the communication master terminal sends a second data request to the communication slave terminal, if the communication master terminal does not receive a response message within 500ms, the connection is overtime, at the moment, the communication is interrupted, and the process of the first stage needs to be repeated; the third stage is to close the connection, first by the communication master end closing the connection request, then the communication slave end responding to the request, the connection closing.
Preferably, the Modbus/TCP protocol message is divided into a data request message and a data response message, wherein the data request message and the data response message are respectively formed by three parts: MBAP message header, message type function code and service data.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects:
compared with the traditional human-machine interface (HMI) development which needs to establish a Modbus I/O server, the system development step is simpler, and the software directly calls Labvie software communication functions, so that the system construction and debugging period is short; in the operation process, the HMI interface is friendly, and has a stable abnormal state processing mechanism and a flexible file configuration mechanism; in the running process, the multi-object high-efficiency communication is realized, the acquired data is complete, the storage is stable, and the query processing is convenient. The whole system is stable in operation, reliable in control and friendly in operation.
Drawings
Fig. 1 is a schematic diagram of a Modbus/TCP communication model provided by an embodiment of the invention.
Fig. 2 is a flowchart of the operation of the tram real-time data acquisition system provided by the embodiment of the invention.
Fig. 3 is a flowchart of a main communication module according to an embodiment of the present invention.
Fig. 4 is a diagram illustrating a field design screenshot of an energy consumption data table according to an embodiment of the present invention.
Fig. 5 is a block diagram of an energy consumption data storage procedure provided by an embodiment of the present invention.
FIG. 6 is a screenshot of an update form SQL command provided by an embodiment of the invention.
Fig. 7 is a diagram illustrating a random energy consumption data screenshot according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols:
1. the data acquisition system of the modern tram can acquire data to be acquired through communication with the vehicle section energy management system through field investigation, and the data acquisition system transmits and receives the data through Modbus/TCP protocol. The Modbus/TCP protocol is a message transmission protocol running on TCP/IP, namely, modbus protocol frames are embedded into the TCP/IP protocol, and Modbus protocol messages are transmitted by using a network. Modbus is commonly used for network communication for monitoring and data acquisition (supervisory control and data acquisition, SCADA) between devices, while TCP can efficiently process Modbus requests and responses in software, using dedicated connections and identifiers to achieve a more efficient network connection. Compared with the serial link Modbus ASCII or RTU communication, the communication protocol based on the Ethernet has better expandability, is easier to integrate different gateway devices, and has higher transmission efficiency. The communication process of the Modbus/TCP protocol adopted by the invention and the Modbus/TCP protocol message are as follows:
(1) The communication process of the Modbus/TCP protocol comprises three stages, wherein the first stage is that a modern tramcar energy-saving management system is used as a communication main end of the Modbus/TCP, the communication connection with the energy management system is actively initiated by setting an IP address and a port, the energy management system is used as a slave end of the communication, the connection request of the main end is waited and received, and the two parties establish reliable TCP connection; the second stage is that the communication master terminal sends a first data request to the communication slave terminal, after waiting for the response of the communication slave terminal, the communication master terminal sends a second data request to the communication slave terminal, if the communication master terminal does not receive a response message within 500ms, the connection is overtime, at the moment, the communication is interrupted, and the process of the first stage needs to be repeated; the third stage is to close the connection, first by the communication master end closing the connection request, then the communication slave end responding to the request, the connection closing. The Modbus/TCP communication model is shown in FIG. 1.
(2) The Modbus/TCP protocol message is divided into a data request message and a data response message, wherein the data request message and the data response message are respectively composed of three parts: MBAP message header, message type function code and service data. The message header and the function code of the request message and the response message are the same, the content of the service data is different, and the data formats of the Modbus/TCP messages are shown in table 1 and table 2.
Table 1 data request message format
Figure BDA0002311518780000051
Table 2 data reply message format
Figure BDA0002311518780000052
2. The system is developed by adopting a Labview platform, a foreground page adopts an Ethernet communication program, a database access reading program and a graphic waveform display control in a LabVIEW function library, a back-end database adopts a MySQL database to construct a big data processing and technical service mode, the system is installed on an industrial computer, and can be independently debugged and operated, and a system operation flow chart is shown in figure 2.
3. The upper computer software system is developed in a Labview environment, and the whole program is integrated into two major modules: the system comprises a main communication module and a data processing and storing module, wherein each module is developed based on a Labview software queue message processor template, and the program is as follows:
(1) Main communication module
After the TCP connection is successful, modbus communication is carried out, and register data are obtained; converting the read holding register data into Modbus data units through MB Modbus Command to Unit.vi, transmitting the Modbus data units on the Ethernet according to a set message header format through MB Ethernet transmit.vi, receiving the Modbus data units through MB Ethernet receive.vi, and closing TCP connection at the same time; the MB decoder data.vi compares the data requested to be sent with the Modbus data units received, stores the received data into a holding register, and finally obtains the data required by the system through an index array function; the flow diagram is shown in fig. 3.
(2) Data processing and storing module
(1) Design of data form fields
The vehicle operating energy consumption data includes charging voltage, charging current and charging energy consumption, so an energy consumption data table is built in the mysql database, and the table field design is shown in fig. 4. The vehicle energy consumption data table includes: a primary key (id), a station name (ststinname), a charging voltage (voltage), a charging current (current), a vehicle energy consumption (sampling), and a collection time (time).
(2) Data storage programming
And storing the real-time energy consumption data acquired by the acquisition module into a table created by the mysql database, establishing a connection between the system and the database through an account and a password of the database, and storing the data to be stored into a field designated by the table by utilizing SQL insert sentences, wherein an energy consumption data storage program is shown in figure 5.
(3) Updating of database tables
The daily energy consumption data are stored in different database tables, the tables are named as 'running energy consumption' + 'date', SQL sentences are written to create new data tables, so that the daily energy consumption data are stored in the designated tables, and the update table SQL command is shown in figure 6.
4. Experiment verification
In order to test the reliability of the system, a network port debugging tool is utilized to debug the related acquisition program, and a starting register address, the number of registers and the numerical value of each register are set; in the data acquisition program, the IP address and port number of the debugging tool are input, the acquisition program is started, connection is established with a debugging tool server, the acquisition program sends a Modbus request to the server, and the server returns the data request. The data request message and the data response message are respectively set as follows:
data request message: 00 02 00 00 00 06 01 03 00 00 00 08
Data response message: 00 02 00 00 00 13 01 03 10 00 00 03 84 00 00 06 A4 00 03 95 00 00 07 08
The value comparison of the register corresponding to the network port debugging tool shows that the analyzed register value is accurate. A piece of randomly stored energy consumption data is shown in fig. 7. The energy-saving management of the modern tramcar depends on a large amount of real-time data analysis, a modern tramcar data acquisition system based on a Modbus/Tcp communication protocol is developed, and in the development process, the software directly calls Labvie software communication functions, so that the system has short construction and debugging period, is friendly to an HMI interface in the operation process, has a stable abnormal state processing mechanism and a flexible file configuration mechanism, realizes multi-object high-efficiency communication in the operation process, has complete acquired data, is stable in storage and is convenient for query processing.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (3)

1. The tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols is characterized by comprising a main communication module and a data processing and storing module, wherein the modules are based on Labview software queue message processor templates, a foreground page adopts an Ethernet communication program, a database access reading program and a graphic waveform display control in a Labview function library, a rear-end database adopts a MySQL database to construct a big data processing and technical service mode, the system is installed on an industrial computer, and the programs of the main communication module and the data processing and storing module are as follows:
(1) Main communication module
After the TCP connection is successful, modbus communication is carried out, and register data are obtained; converting the read holding register data into Modbus data units through MB Modbus Command to Unit.vi, transmitting the Modbus data units on the Ethernet according to a set message header format through MB Ethernet transmit.vi, receiving the Modbus data units through MB Ethernet receive.vi, and closing TCP connection at the same time; the MB decoder data.vi compares the data requested to be sent with the Modbus data units received, stores the received data into a holding register, and finally obtains the data required by the system through an index array function;
(2) Data processing and storing module
(1) Design of data form fields
Establishing an energy consumption data table in the mysql database, wherein the vehicle energy consumption data table comprises: six fields including a main key, a station name, charging voltage, charging current, vehicle energy consumption and acquisition time;
(2) data storage programming
Storing the real-time energy consumption data acquired by the acquisition module into a created table of the mysql database, establishing a system connection with the database through an account and a password of the database, and storing the data to be stored into a field appointed by the table by utilizing SQL insert sentences;
(3) updating of database tables
The daily energy consumption data are stored in different database tables, the tables are named as 'operation energy consumption' + 'date', and SQL sentences are written to create new data tables, so that the daily energy consumption data are stored in the appointed tables.
2. The tramcar real-time data acquisition system based on Labview and Modbus/TCP communication protocols according to claim 1, wherein the communication process of Modbus/TCP protocol comprises three stages, the first stage is that a modern tramcar energy-saving management system is used as a communication main end of Modbus/TCP, communication connection with the energy management system is actively initiated by setting an IP address and a port, the energy management system is used as a slave end of communication, and the two parties establish reliable TCP connection by waiting for and receiving a connection request of the main end; the second stage is that the communication master terminal sends a first data request to the communication slave terminal, after waiting for the response of the communication slave terminal, the communication master terminal sends a second data request to the communication slave terminal, if the communication master terminal does not receive a response message within 500ms, the connection is overtime, at the moment, the communication is interrupted, and the process of the first stage needs to be repeated; the third stage is to close the connection, first by the communication master end closing the connection request, then the communication slave end responding to the request, the connection closing.
3. The tram real-time data acquisition system based on Labview and Modbus/TCP communication protocols according to claim 1, wherein the Modbus/TCP protocol messages are divided into data request messages and data response messages, and the data request messages and the data response messages are respectively composed of three parts: MBAP message header, message type function code and service data.
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