CN1845084A - Embedded remote monitoring system based on Ethernet and PSTN communication mode - Google Patents
Embedded remote monitoring system based on Ethernet and PSTN communication mode Download PDFInfo
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Abstract
The invention relates to a remote-control detect system based on Ethernet and PSTN communication and embedded technique. It comprises part of detecting terminal hardware platform (based on ARM processor) and part of embedded operation system (uClinux); the software of detect system uses C program based on uClinux multi-path technique; uses RS-485 bus to realize the real-time collecting, treating, and storing on the operation data of controller PCL; uses network as the transmission carrier of information; real-time transmits collected data to the detecting center according to the order of detecting center host computer; according to the actual communication state, designs independent communication module to make the detect terminal flexibly select Ethernet or PSTN public telephone network to communicate data with the detecting center. The invention can reduce the building cost and maintain cost of remote detecting network, and it can confirm the flexibility, real-time property and reliability of data and control information transmission, while it can improve the expandable property of system network.
Description
Technical field
The network communications technology and embedded system technology field have been the present invention relates to.Exactly, the present invention relates to the research of exploitation various network communications mode under embedded system technology.
Background technology
Be similar to general-purpose computing system, embedded system also is made up of the hardware and software two large divisions.Hardware components is the physical basis of total system, is made up of high performance microprocessor and peripheral interface circuit, and it provides the platform and the communication interface of running software; Software section generally constitutes the operation of control system by the application program of embedded OS and operation on it; Connect by middle layer (BSP layer, plate level support package) between the software and hardware.
At present, the most of embedded systems of industrial control field still are in the stage of independent application, for realize between a plurality of embedded systems information sharing with exchange, can utilize bus networkings such as CAN, RS-232 and RS-485.But the effective radius of network is shorter, and is isolated to outside the public network.
Summary of the invention
One of purpose of the present invention is to utilize asynchronous serial communication interface chip TL16C554A to expand two serial ports, is convenient to articulate the external series equipment of monitor terminal.
Another object of the present invention is to set up the embedded remote monitoring system of a various network communications mode.This system adopts embedded device as RTU, use the RS485 bus to realize collection, processing, the storage of real time data, utilize current public computer network Internet built-in terminal to be connected online, form based on network embedded remote monitoring system with public telephone network PSTN.
For realizing above purpose, circuit theory diagrams, the application software module that the invention provides the expansion serial ports designs, the design of communication module, comprising: monitor terminal and Siemens S7-200PLC communicator module; Monitor terminal and Master Control Center application server communication submodule.
According to expansion serial port circuit schematic diagram of the present invention, realized the access of external series equipment Modem.
According to application software module of the present invention design, in order to improve the operational efficiency of system, utilize the support of uClinux to multi-thread mechanism, the software systems of remote terminal are divided into four concurrent threads realize.Be respectively: data acquisition thread, data storage thread, data transmission line journey and fault alarm thread.
According to the communicator module between remote terminal of the present invention and the PLC, mainly comprise remote terminal to the PLC image data, the process of PLC feedback data.Native system adopts the serial communication mode, by the RS-485 cable, follows point-to-point interface (Point-to-Point is called for short PPI) the agreement realization remote terminal of serial communication protocol and Siemens Company formulation and the exchanges data between the PLC.
According to remote terminal of the present invention and apps server communicator module, mainly comprise Ethernet mode communication module and Modem dial mode communication module.Utilize existing internet and public switched telephone network resource, and embedded OS is realized the long distance control system of communication mode Network Based to the support of ICP/IP protocol.The constraint of shortcomings such as it is shorter to have broken away from the traditional control system transmission range, and covering radius is limited.
Description of drawings
Figure 1A is expansion serial interface circuit theory diagrams.
Figure 1B is a remote terminal software initialization process flow diagram
Fig. 1 C is the data dictionary input interface
Fig. 2 A is data acquisition flow figure
Fig. 2 B is the local datastore process flow diagram
Fig. 2 C is an embedded monitoring terminal transmits data process flow diagram
Fig. 3 A is a real time data transmitting monitoring window
Fig. 3 B is the embedded remote terminal process flow diagram that sends a warning message
Fig. 3 C is that ethernet communication mode remote terminal and application server communication are set up process flow diagram
Fig. 4 A is a Modem dialcom process flow diagram.
Fig. 4 B (a) is that actual motion-figure connects in Modem communication
Fig. 4 B (b) is Modem communication actual motion-disconnection connection layout
Embodiment
The preferred embodiments of the present invention are described now in conjunction with the accompanying drawings.
The present invention is a kind of communication mode long distance control system Network Based that is applied to.
According to a preferred embodiment of the invention, this system comprises the design of expansion serial ports, application software design, monitor terminal and Siemens S7-200PLC communicator modular design, monitor terminal and the design of Master Control Center application server communication submodule of monitor terminal.
Monitor terminal serial ports expansion in the preferred embodiment of the present invention partly comprises: serial ports expansion chip TL16C554A, decoder chip 74LV138, level transferring chip MAX3243 and MAX3485.In order to save the I/O interface resource of S3C44B0X, in circuit design, use the 74LV138 chip as address decoder, chip selection signal CSA, CSB, CSC and the CSD of control serial-port select certain concrete serial ports to communicate as required.In addition, the bank4 of native system (memory bank 4) is idle, thus the nGCS4 signal wire of CPU link to each other with the OE2A signal wire of 74LV138, the TL16C554A carry on the bank4 address space.IOR links to each other with RD, the WR of S3C44B0 with IOW; Register selects pin A0～A2 to link to each other with the A0～A2 of processor in the sheet, comes direct mask register by processor.
The reset signal RST of TL16C554A is that high level is effective, and the reset signal nReset of S3C44B0X is that low level is effective.Therefore, design a simple voltage reversal pull-up circuit in the native system and be connected between the reset signal of systematic reset signal and TL16C554A, realized the synchronous reset of total system.
Data line D0～D7 of TL16C554A directly links to each other with the data line of S3C44B0X.Utilize MAX3243 and MAX3485 chip to realize level conversion in the native system.The connection of RS485 can be adopted twisted-pair feeder, maskable external disturbance under the situation that has improved transmission range, thus improve the serial communication quality.
TL16C554A has two kinds of working methods: inquiry mode and interrupt mode.Under inquiry mode, it is too much to take system time, has reduced the performance of system.Therefore, in native system, adopt interrupt mode, the INTA of TL16C554A, INTB are received external interrupt EXINT4～EXINT5 of S3C44B0X respectively.Like this, the expansion serial ports just can be operated under the interrupt mode independently, has guaranteed the high-speed communication of internal system.
According to a preferred embodiment of the invention, the application software design comprises software initialization, real-time data acquisition, local datastore, real-time and historical data transmission and fault alarm.
The function of remote terminal initialization procedure be for effective operation inlet porting parameter of each module of application software as the machine set type of institute's monitoring electromechanical equipment, the basic parameter of electromechanical equipment and the communication mode of remote terminal.Its flow process is shown in Figure 1B.These parameters all leave in the text that is called " data dictionary ", and when being electromechanical equipment when RTU is installed, data dictionary follows application software together to install.The data dictionary content difference of different electromechanical equipments, but all follow unified format, data dictionary is filled in as the case may be by the engineering staff, typing for convenience, system design a data dictionary recording program, its interface is shown in Fig. 1 C.
Data acquisition is the basis of whole software and crucial, is the core of application software, also is the data source of whole electromechanical equipment long distance control system, so the data acquisition thread is designed to the main thread of application software, first calls after initialization.The storage of afterwards local record, in real time, historical data sends and the exploitation of fault alarm thread all depends on the realization of this thread.It is provided with data acquisition density, according to the dissimilar selections of electromechanical equipment data acquisition type and data access form is set according to the initialization files content.The software flow of data acquisition module is shown in Fig. 2 A.
Record from the data acquisition thread reads does not store in the Master Control Center database if receive the request of Master Control Center, will be covered by next bar record, and this shortcoming will cause being subjected to the long-time disappearance of monitored object service data.For the electromechanical equipment of normal operation, the storage running parameter is perhaps useless, in a single day when still breaking down, several days the data in fault front and back are for Electromechanical Equipment Fault Diagnosis and keep in repair quite key.Therefore, the electromechanical equipment service data is got up to seem very necessary as recording storage.In teleterminal system, opened up a storage area, with logout as file storage in this locality, be set in detection and control terminal and store nearest 4 days operational factor.The realization of this function will provide detailed reference data to the operation maintenance and the fault diagnosis of electromechanical equipment.Strengthened this long distance control system towards the perfect extensibility of expert diagnostic system.The flow process of data storage is shown in Fig. 2 B.
The main task of network-based remote supervisory system be be positioned at far-end the monitoring point data in real time be sent to Surveillance center, and can provide enough record data as the maintenance foundation of equipment in the future.Native system provides in real time, the historical data sending function reaches this purpose.This function is designed to an independently thread, starts after main thread.Because the difference of communication condition, real-time, historical data is divided into two kinds of implementation: Modem and Ethernet.Any communication mode of concrete employing is selected to set by the engineering staff when carrying out data transmission, can change at any time, has very big dirigibility.Send in real time, the basic transmission flow of historical data is all shown in Fig. 2 C.Data transmission procedure as shown in Figure 3A.
The interpolation of fault alarm function has improved the practicality of long distance control system.When the bottom electromechanical equipment produced alarm, the embedded remote terminal can send to Surveillance center with alarm data automatically, and its flow process is shown in Fig. 3 B.Remote terminal sends a warning message and finishes by thread independently, the interval of setting when the embedded remote terminal will be according to the application software initialization regularly starts warning information and checks thread, in case be checked through this information is warning information, judge at once whether this electromechanical equipment has set up connection with Master Control Center, if do not connect, connect earlier, then send alert command to Master Control Center, after Master Control Center is received this order, receiving alarm information ejects the warning information prompting frame at Master Control Center.If remote terminal has been set up connection with Master Control Center, illustrate that remote terminal and Master Control Center application server are carrying out data communication, need at this moment to judge that the data that remote terminal sends are historical information or real-time information.If historical information, send alert command and warning information again after just waiting historical information all to send to finish; If what send is real-time information, then finish in the current record transmission, send alert command earlier to Master Control Center, then send a warning message.
According to a preferred embodiment of the invention, communicator module software between monitor terminal exploitation and the PLC, the PPI agreement that adopts Siemens Company's formulation is as the communication protocol between embedded system and the S7-200CPU, need not the program of PLC itself is made amendment, guarantee the safety of industrial control system and stable, and provide a kind of new implementation pattern for backward compatible long distance control system.
The PPI agreement is a kind of MS master-slave communication protocol: the equipment of communication is divided into main website and slave station.PLC is defaulted as slave station, and embedded system is as main website.To initiate a request as the embedded system of main website to the PLC as slave station is example.At first, main website generates a data claim frame with destination address 02H, source address 00H, and for the request of reading, mode word FC is 7CH.The request of data frame that generates is (with a hexadecimal representation): 68H 1BH 1BH 68H 2H 0H 6CH 32H 1H 0H 0H 6H 6H 0H EH 0H 0H 4H 1H 12HAH 10H 4H 0H 1H 0H 1H 84H 0H 4H 40H BAH 16H.Main website reads serial ports after sending this request and waiting for for 1 second, if PLC correctly responds, then can send one and confirm byte E5H, after main website reads this byte, know further to send the request of data acknowledgement frame that then interior at interval at the appointed time transmission request of data acknowledgement frame is to serial ports.The acknowledgement frame content is: 10H 02H 00H 5CH 5EH 16H.After PLC correctly receives this acknowledgement frame,, and, data are sent by serial ports according to the transmission data frame format packing that the PPI agreement is stipulated with regard to register value specified in the reading of data claim frame.Embedded main website receives this Frame that contains required required parameter value, just according to the regulation of agreement, data parsing is come out, and is stored among the local FLASH, thereby finish the process of a data acquisition and storage.
Remote terminal and apps server communication module comprise Ethernet mode communication module and Modem dial mode communication module according to a preferred embodiment of the invention.Ethernet communication module application program implementation process is as follows: because in computing machine, data storage has two kinds of byte priorities: upper byte is preferential and low byte is preferential.On the internet, data are with the transmission of upper byte priority, so for the data of storing with the low byte mode of priority in inside, need change and could transmit on the internet.
* struct sockaddr: be used for preserving socket information
struct?sockaddr{
Unsigned short sa_family; / * address family, AF_xxx*/
Char sa_data[14]; The protocol address * of/* 14 bytes/
}：
* struct sockaddr_in; / * be used for carrying out the conversion * of data type/
struct?sockaddr?in{
Short int sin_family; / * address the * of family/
Unsigned short int sin_port; / * port numbers */
Sruct in_addr sin_addr; / * IP address */
Unsigned char sin_zero[8]; / * fills 0, with keep with the onesize * of struct sockaddr/
}；
Communicating by letter between RTU and the Surveillance center communication host, native system adopts connection-oriented client computer---server model, and it connects flow process shown in Fig. 3 C.
At server end: when monitoring host computer calls socket () function, set up a socket (socket), specify TCP and related protocol; The socket number binding in socket address (comprising local host address and local port number) that this locality is created and create ground afterwards; Main frame is monitored on this port numbers; Call accept () and accept the connection request that RTU is sent; The services request of sending by read () function receiving remote detection and control terminal; Request by write () function response RTU.
At client-side: when RTU similar service device end calls a socket () function, set up a socket (socket), specify TCP and related protocol; By connect () local port number and address information are passed to center host, request connects; Carry out the transmission of Connection Service request and the reception of response by read () and write () function afterwards.
Modem dial mode communication module design implementation process: according to the basic theories such as Codes and Standards of Modem communication, (with calling party is example to native system medium-long range detection and control terminal shown in Fig. 4 A with flow scheme design that the Master Control Center application server is communicated by letter by PSTN, callee's program circuit similarly just dials and changes monitoring into).
Consider that this long distance control system is uninterrupted the running, behind each sign off (or line interruption), require Modem to have autonomous reset function, therefore in software design procedure, common Modem on-hook operation (ATH0) afterwards, send the ATZ order by program, artificially control Modem and reset, return to the initial power-up state and await orders.
Open the serial ports that is used for Modem communication, carry out settings such as serial ports baud rate, data bit, verification mode, the Modem that system will be used to communicate by letter is initialized as can the auto-pickup state, monitors the CONNECT response whether Modem is arranged on the serial ports then, if no, then continue to monitor; If listen to the CONNECT response, the long-range Modem of having connection request is described, and has connected, can send data.
Every transmission one secondary data, whether have Modem response return, if there is response to return if then checking, judge to be " NO CARRIER " signal,, Modem communication broken string or Master Control Center on-hook are described if return signal is " NO CARRIER ", then stop to send data, continue to monitor.In system's actual motion, Modem dial-up connection process is shown in Fig. 4 B (a), 4B (b).
Claims (7)
1, the monitor terminal hardware platform comprises:
The CPU part, the S3C44B0X chip of choosing is high performance-cost ratio and high performance 16/32 risc microcontroller of Samsung's design, include a low-power consumption, 16/32 ARM7TDMI processor cores of high-performance (high primary frequency 66MHz), be applicable to occasion price and sensitive power consumption.
The peripheral circuit part comprises: accumulator system, serial communication interface, Ethernet interface, clock system and other Circuits System.Accumulator system comprises: SDRAM, NOR and NAND Flash storer; Serial communication interface comprises the dual serial interface that the S3C44B0X microprocessor carries and utilizes two serial ports of asynchronous serial communication interface chip TL16C554A expansion; Clock system comprises system's major clock and real-time clock; Other circuit comprise power circuit, reset circuit and jtag interface circuit.
2, outside serial device is more in the native system, need connect Modem (modulator-demodular unit), PLC a plurality of peripheral serial devices such as (programmable logic controller (PLC)s) simultaneously, original serial port resource of the described S3C44B0X chip of claim 1 is difficult to satisfy the demand of system, therefore, the asynchronous communication chip TL16C554A that utilizes TI (Texas Instruments) company to produce has realized the expansion of serial ports, and two external unit PLC that serial ports COM0 is used to be connected host and articulates supervisory system with COM1 that carry.
3, asynchronous serial communication interface chip TL16C554A according to claim 2 is characterized in that: add the driving logic by four enhancement mode TL16C550B asynchronous communication unit (ACE) and form.Each ACE can carry out the data that receive from peripherals or modulator-demodular unit serial/parallel conversion or the data character that CPU transmits is carried out parallel/serial conversion.Monitor terminal uses this chip to expand the dual serial communication interface, articulates the external unit Modem of supervisory system.
4, supervisory system application software part comprises: real-time collection, processing, the storage area of data among the PLC; Ethernet mode communication module software section; Modem dial mode communication module software section.On supervisory system, realized the various network communications mode, it is characterized in that: use simulation net (PSTN) that Modem dialing and ethernet communication dual mode complement one another and the digital network scheme that combines, can go to select data transmission manner according to the hardware condition and the application feature of on-site supervision point.
5, the software design of the real-time collection of data, processing, storage area among the PLC according to claim 4 comprises software initialization, real-time data acquisition, local datastore, real-time and functions such as historical data transmission and fault alarm.
6, Ethernet mode communication module software section according to claim 4 adopts the Linux gordian technique of exploitation Ethernet application program down: the socket communication mechanism.What communicating by letter between RTU and the Surveillance center communication host adopted is connection-oriented client computer---server model.
7, Modem dial mode communication module software section according to claim 4 has realized that remote monitoring terminal communicates by letter by PSTN (public switched telephone network) with the Master Control Center application server.Supervisory system is uninterrupted running, behind each sign off (or line interruption), require Modem to have autonomous reset function, therefore in software design procedure, common Modem on-hook operation (ATH0) afterwards, send the ATZ order by program, artificially control Modem and reset, return to the initial power-up state and await orders.
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| CN101873242A (en) * | 2010-05-24 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Network code divider and method for controlling front-end equipment |
| CN101650562B (en) * | 2009-08-18 | 2011-05-11 | 上海奈凯电子科技有限公司 | Method for realizing PLC port control by C language in digital control machine tool system |
| CN101605128B (en) * | 2009-04-22 | 2012-05-23 | 网经科技（苏州）有限公司 | Method for carrying out communication by LINUX primary and secondary devices through Ethernet interface |
| CN102710339A (en) * | 2012-05-15 | 2012-10-03 | 哈尔滨工程大学 | Water sound Modem (modulator-demodulator) management platform and water sound Modem management method |
| CN102932561A (en) * | 2011-07-28 | 2013-02-13 | 塔塔咨询服务有限公司 | System and method for monitoring a voice in real time |
| CN103676763A (en) * | 2013-12-09 | 2014-03-26 | 国网电力科学研究院 | Method for achieving communication with Siemens S5 PLC based on UNIX platform and LINUX platform |
| CN105245597A (en) * | 2015-10-09 | 2016-01-13 | 深圳电器公司 | Communication method and device |
| CN105549970A (en) * | 2015-12-09 | 2016-05-04 | 上海斐讯数据通信技术有限公司 | Boot method and system based on Linux operation system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101605128B (en) * | 2009-04-22 | 2012-05-23 | 网经科技（苏州）有限公司 | Method for carrying out communication by LINUX primary and secondary devices through Ethernet interface |
| CN101650562B (en) * | 2009-08-18 | 2011-05-11 | 上海奈凯电子科技有限公司 | Method for realizing PLC port control by C language in digital control machine tool system |
| CN101873242A (en) * | 2010-05-24 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Network code divider and method for controlling front-end equipment |
| CN101873242B (en) * | 2010-05-24 | 2012-07-18 | 杭州海康威视数字技术股份有限公司 | Network code divider and method for controlling front-end equipment |
| CN102932561A (en) * | 2011-07-28 | 2013-02-13 | 塔塔咨询服务有限公司 | System and method for monitoring a voice in real time |
| CN102932561B (en) * | 2011-07-28 | 2015-11-11 | 塔塔咨询服务有限公司 | For the system and method for real-time listening sound |
| CN102710339A (en) * | 2012-05-15 | 2012-10-03 | 哈尔滨工程大学 | Water sound Modem (modulator-demodulator) management platform and water sound Modem management method |
| CN103676763A (en) * | 2013-12-09 | 2014-03-26 | 国网电力科学研究院 | Method for achieving communication with Siemens S5 PLC based on UNIX platform and LINUX platform |
| CN105245597A (en) * | 2015-10-09 | 2016-01-13 | 深圳电器公司 | Communication method and device |
| CN105549970A (en) * | 2015-12-09 | 2016-05-04 | 上海斐讯数据通信技术有限公司 | Boot method and system based on Linux operation system |
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