CN113805476B - High-reliability network early warning method and system - Google Patents
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Abstract
The invention discloses a high-reliability network early warning method and a system. The method is applied to an automatic control system of a large sewage treatment plant and comprises the following steps: s10, mutually transmitting preset heartbeat packet data blocks between two adjacent control stations is controlled; s20, detecting whether the current control station receives a preset heartbeat packet data block sent by the adjacent control station within preset time, and if so, executing the step S30; otherwise, a first early warning signal is sent; comparing the detected preset heartbeat packet data block received by the current control station with the preset heartbeat packet data block sent by the control station adjacent to the detected preset heartbeat packet data block; when the comparison results are inconsistent, acquiring and identifying an abnormal identification bit returned by the current control site, judging that the bit communication is abnormal, and sending out a second early warning signal; and when the comparison results are consistent, acquiring and identifying the normal identification bit returned by the current control station, judging that the network communication is good, and repeatedly executing the step S10. The invention can effectively improve the operation reliability of an automatic control system.
Description
Technical Field
The invention belongs to the technical field of network early warning, and particularly relates to a high-reliability network early warning method and system.
Background
The sewage treatment plant is a place where the sewage (waste) discharged from a pollution source is subjected to manual strengthening treatment when the total pollutant content or concentration of the sewage (waste) is higher and cannot meet the discharge standard requirement or the environmental capacity requirement, thereby reducing the water environment quality and the functional target.
In general, a large sewage treatment plant is formed by combining and constructing a plurality of structures with different functions, and comprises an automatic control system, wherein the automatic control system is used for realizing linkage and mutual control of the plurality of functional structures. However, the conventional automation control system of the large-scale sewage treatment plant is easy to cause network paralysis of the whole system due to network communication reasons of individual structures and adjacent structure sections controlled in linkage, so that the operation reliability of the system is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-reliability network early warning method and a system, and aims to solve the problem of low operation reliability of an automatic control system in a traditional large-scale sewage treatment plant.
In order to achieve the above object, in a first aspect, the present invention provides a high reliability network early warning method, which is applied to an automation control system of a large-scale sewage treatment plant, wherein the automation control system comprises a centralized management system and a plurality of control sites, and the method comprises the following steps:
S10, mutually transmitting preset heartbeat packet data blocks between two adjacent control stations, wherein the preset heartbeat packet data blocks of each control station comprise a number, a comparison bit and a check bit;
S20, detecting whether the current control station receives a preset heartbeat packet data block sent by the adjacent control station within preset time, and if so, executing the step S30; otherwise, determining that the bit communication is interrupted, and sending out a first early warning signal;
s30, comparing the detected preset heartbeat packet data blocks received by the current control station with preset heartbeat packet data blocks sent by the control station adjacent to the current control station, wherein the comparison comprises number comparison, comparison bit comparison and check bit comparison;
S40, when the comparison results are inconsistent, acquiring and identifying an abnormal identification bit returned by the current control site, judging that bit communication is abnormal, and sending a second early warning signal; and when the comparison results are consistent, acquiring and identifying the normal identification bit returned by the current control station, judging that the network communication is good, and repeatedly executing the step S10.
According to the high-reliability network early warning method provided by the invention, the heartbeat packet with the parameter is transmitted between two adjacent controllers, the network communication quality is judged through comparison and verification of the heartbeat packet, and when the network communication fails, the failure early warning is timely carried out, so that the operation reliability of an automatic control system can be effectively improved.
In one embodiment, the preset heartbeat packet data block of each control station includes a unique number and a comparison bit, and the check bit of each control station is generated by performing check calculation according to a specific rule according to the unique number and the comparison bit in the preset heartbeat packet data block.
In one embodiment, the step of comparing the detected preset heartbeat packet data block received by the current control station with preset heartbeat packet data blocks sent by its neighboring control stations includes:
Firstly, comparing numbers in a preset heartbeat packet data block; when the number comparison is consistent, comparing the comparison bits in the preset heartbeat packet data; and when the comparison bit comparison is consistent, performing check bit comparison of a preset heartbeat packet data block.
In one embodiment, after the step of obtaining and identifying the anomaly identification bit returned by the current control station, the method further includes:
Interrupting network communication between the current control station and the adjacent control station section;
And simultaneously controlling the current control station to continuously send a preset heartbeat packet data block to the adjacent control station until the abnormal identification bit returned by the current control station is obtained and identified to be normal, and then restoring the communication of the network.
In one embodiment, the plurality of control stations perform data transmission with the centralized management system through an industrial ethernet ring of a TCP/IP protocol, and the industrial ethernet ring is connected through optical fibers by adopting a plurality of ring network optical fiber switches.
In one embodiment, the centralized management system includes two sets of redundant data servers and a plurality of terminals, the data servers perform data transmission with a plurality of control sites through a dual-layer industrial ethernet ring network, and the two sets of data servers perform data transmission with a plurality of terminals through an ethernet switch.
In a second aspect, the present invention provides a high reliability network early warning system, applied to an automation control system of a large sewage treatment plant, where the automation control system includes a centralized management system and a plurality of control sites, and the network early warning system includes:
a control module for executing step S10: s10, mutually transmitting preset heartbeat packet data blocks between two adjacent control stations, wherein the preset heartbeat packet data blocks of each control station comprise a number, a comparison bit and a check bit;
The detection module is configured to perform step S20: s20, detecting whether the current control station receives a preset heartbeat packet data block sent by the adjacent control station within preset time, and if so, executing the step S30; otherwise, determining that the bit communication is interrupted, and sending out a first early warning signal;
The comparison module is used for executing step S30: s30, comparing the detected preset heartbeat packet data blocks received by the current control station with preset heartbeat packet data blocks sent by the control station adjacent to the current control station, wherein the comparison comprises number comparison, comparison bit comparison and check bit comparison;
The early warning module is used for executing step S40: s40, when the comparison results are inconsistent, acquiring and identifying an abnormal identification bit returned by the current control site, judging that bit communication is abnormal, and sending a second early warning signal; and when the comparison results are consistent, acquiring and identifying the normal identification bit returned by the current control station, judging that the network communication is good, and repeatedly executing the step S10.
According to the high-reliability network early warning system provided by the invention, the heartbeat packet with the parameter is transmitted between two adjacent controllers, the network communication quality is judged through comparison and verification of the heartbeat packet, and when the network communication fails, failure early warning is timely carried out, so that the operation reliability of the automatic control system can be effectively improved.
Drawings
FIG. 1 is a flow chart of a high reliability network early warning method provided by the invention;
Fig. 2 and fig. 3 are schematic diagrams of a read and send data module, which is set up by each control station and is used for communicating with its adjacent control station, respectively;
Fig. 4 is a schematic structural diagram of an automation control system of a large-scale sewage treatment plant according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a high-reliability network early warning system provided by the 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.
The traditional large-scale sewage treatment plant automation control system is easy to cause network paralysis of the whole system due to network communication reasons of individual structures and adjacent sewage treatment plant sections controlled in linkage, so that the system has low operation reliability. The invention provides a high-reliability network early warning method for improving the operation reliability of a system.
It should be noted that, in general, a large sewage treatment plant is formed by combining and constructing a plurality of structures with different functions, and includes an automation control system, through which linkage and mutual control of a plurality of functional structures are realized.
Specifically, the automatic control system mainly comprises a site measurement and control layer and a central management layer. The field measurement and control layer comprises a plurality of control stations which are correspondingly arranged on structures with different functions, each control station comprises a controller and can also comprise an instrument, the controller is mainly responsible for collecting field data, and the field equipment is started and stopped according to a program set and preset manually and mainly comprises a pump, a fan, a stirrer, a propeller, a grid machine, a squeezer, a gate, a valve and the like; the meter is primarily responsible for displaying data of the operation of the field device. The central management layer comprises a central management system, performs data communication with a plurality of controllers through a ring network, is used for storing and displaying data, is a human-computer interface, receives control instructions issued by operators while displaying the data, and controls the start and stop of field devices through the controllers.
Fig. 1 is a schematic diagram of a high-reliability network early warning method provided by the invention, which is applied to an automated control system of a large-scale sewage treatment plant, such as an automated control system of a north lake sewage treatment plant. The north lake sewage treatment plant is a key project of the national 'Yangtze river large protection' and the 'four-water co-treatment' of the Wuhan city, and adopts a brand new mode of 'four factories in one', and the upgrading and the extension of the current running water service group of the Wuhan city and the planned north lake sewage treatment plant of the mouth sewage treatment plant of the two lang temples are combined and built. The north lake sewage treatment plant is a domestic sewage treatment plant with the largest built-up standard model, and can treat 80 ten thousand tons of domestic sewage daily after being put into operation. The quality of network communication in the automatic control system of the sewage treatment plant is related to the reliable operation of the whole system, and affects the safety of the whole sewage treatment plant, a 17.9 km water delivery official network and 4 pretreatment stations along the way.
The high-reliability network early warning method provided by the invention is formed by running a network detection program in a centralized management system in an automation control system of a large sewage treatment plant, as shown in fig. 1, and comprises the following steps of S10, S20, S30 and S40, and the following details are as follows:
s10, mutually transmitting preset heartbeat packet data blocks between two adjacent control stations are controlled, wherein the preset heartbeat packet data blocks of each control station comprise numbers, comparison bits and check bits.
In step S10, the preset heartbeat packet data block of each control station may be set to include a unique number and a comparison bit, and the check bit of each control station is generated by performing check calculation according to a specific rule according to the unique number and the comparison bit in the preset heartbeat packet data block. Specifically, the check bits may be checked and calculated according to parity check or cyclic redundancy check rules commonly used in the art, and after generating a check code, the check code is stored in a check block and sent to its adjacent control station.
S20, detecting whether the current control station receives a preset heartbeat packet data block sent by the adjacent control station within preset time, and if so, executing the step S30; otherwise, the communication interruption of the position is judged, and a first early warning signal is sent.
S30, comparing the detected preset heartbeat packet data blocks received by the current control station with preset heartbeat packet data blocks sent by the adjacent control station, wherein the comparison comprises number comparison, comparison bit comparison and check bit comparison.
In step S30, the number in the preset heartbeat packet data block may be compared first; when the number comparison is consistent, comparing the comparison bits in the preset heartbeat packet data; and when the comparison bit comparison is consistent, performing check bit comparison of a preset heartbeat packet data block.
S40, when the comparison results are inconsistent, acquiring and identifying an abnormal identification bit returned by the current control site, judging that the bit communication is abnormal, and sending out a second early warning signal; and when the comparison results are consistent, acquiring and identifying the normal identification bit returned by the current control station, judging that the network communication is good, and repeatedly executing the step S10.
In step S40, the identification bit is used to mark the network communication situation, and when the comparison result is inconsistent, the current control station returns an abnormal identification bit to its adjacent control station; and when the comparison results are consistent, the current control station transmits the normal identification bit back to the adjacent control station.
Further, the high-reliability network early warning method provided by the invention not only can early warn network faults, but also can correspondingly process network communication faults, namely in step S40: after the step of acquiring and identifying the anomaly identification bit returned by the current control station, the method further comprises step S50 and step S60, which are described in detail as follows:
S50, interrupting network communication between the current control station and the adjacent control station section.
And S60, simultaneously controlling the current control station to continuously send the preset heartbeat packet data block to the adjacent control station until the abnormal identification bit returned by the current control station is obtained and identified to be normal, and recovering the communication of the network.
In a specific embodiment, the method for determining the network quality is as follows:
(1) And newly creating a heartbeat packet monitoring data block in the custom data block of each control site, wherein the data block comprises a program running state bit, a trigger bit, a device number bit, a comparison bit, an identification bit and a check bit.
(2) The program running state bit is switched, so that the program running mode (automatic circulation running and triggering running) can be changed.
(3) When the program running state bit is in the trigger running mode, the program is activated to complete one-time monitoring running through external triggering.
(4) And establishing transmission, receiving, comparing and returning to the module in the program section. And numbering the devices in the ring network in sequence, starting executing a program by each control station after the system operates, sending heartbeat packet data blocks to adjacent control stations, and executing a comparison program after the adjacent control stations receive the data blocks.
(5) And when the comparison bit of the received data block is identical to the preset comparison bit of the adjacent control site, the data block packet is verified, after the verification is error-free, the evaluation bit is normally communicated, the marking bit of the marking bit is normal, the marking bit is returned, the marking network is well communicated, and the next monitoring is started.
(6) And when the comparison bit of the received data block is different from the comparison bit preset by the adjacent control site or the verification of the data block fails, the evaluation bit is abnormal in communication, the identification bit marks the abnormal bit, and an early warning is sent.
(7) When the network communication quality fails, the current control station cannot return the identification bit when the current control station cannot receive the data block, the return identification bit is not received in the preset time, the communication of the judgment bit is interrupted, and a warning is sent.
In a specific embodiment, the communication fault handling method is as follows:
when the evaluation bit communication is abnormal, the network congestion occurs in a high probability condition.
When the control station receives the abnormal network identification bit returned by the adjacent control station, interrupting the communication of the network, and simultaneously continuously sending a data packet to the adjacent control station for monitoring, and when the abnormal signal of the returned identification bit is not recovered to be normal, keeping the communication interrupted; and after the data identification bit is recovered to be normal, recovering communication.
Fig. 2 and fig. 3 are schematic diagrams of a read and send data module, which is set up by each control station and is used for communicating with its adjacent control station, respectively.
As shown in FIG. 2, data is read from the remote CPU via SFB/FB 14 "GET".
S7-300: the data is read at the rising edge of REQ. The parameters ID, ADDR_1, and RD_1 are transmitted at each rising edge of REQ. After each job is completed, new values may be assigned to the ID, ADDR_1, and RD_1 parameters.
S7-400: the SFB is activated at the rising edge of the control input REQ. The associated pointer (addr_i) to the area to be read will be sent to the partner CPU.
The remote partner returns this data.
At the next SFB/FB call, the received data is copied into the configured receiving area (RD_i).
It must be ensured that the areas defined by the parameters ADDR i and RD i match each other in terms of number, length and data type.
The completion of this operation is indicated by the state parameter NDR being 1.
The read operation can only be re-activated after the previous operation has been completed.
The remote CPU may be in RUN or STOP operating state.
If an access failure occurs while the data is being read, or if an ERROR occurs during the data type check, the ERROR and warning information will be represented by ERROR and STATUS outputs.
As shown in FIG. 3, data may be written to the remote CPU using SFB/FB 15 "PUT".
S7-300: data is sent at the rising edge of REQ. The parameters ID, ADDR_1, and SD_1 are transmitted at each rising edge of REQ. After each job is completed, the ID, ADDR_1, and SD_1 parameters may be assigned new values.
S7-400: the SFB is activated at the rising edge of the control input REQ. The pointer (addr_i) to the area to be written and the data (sd_i) will be sent to the partner CPU.
The remote partner saves the transmitted data under the address provided with the data and returns an execution acknowledgement.
It must be ensured that the areas defined by the parameters ADDR i and SD i match each other in terms of number, length and data type.
If no error occurs, this is indicated by the state parameter DONE being set to a value of 1 at the next SFB/FB call.
Only after the last job is completed can the write job be activated again.
The remote CPU may be in RUN or STOP mode.
If an access failure occurs while data is being written, or if an ERROR is made in performing the check, the ERROR and warning information will be represented by ERROR and STATUS outputs.
In order to achieve the purpose of the invention, the invention also provides an automatic control system of the large sewage treatment plant, which is based on a TCP/IP protocol and an Siemens AS410 Ethernet communication model to realize early warning of network faults.
It should be noted that, in the medium access control method of CSMA/CD adopted in ethernet, the medium access control method is essentially non-real-time, and is not easy to cause network congestion when large data volume is simultaneously transmitted, compared with the medium access control method of equal competition. Meanwhile, a network monitoring program is designed in a centralized management system in an automatic control system, so that the aim of automatically monitoring the network communication quality can be fulfilled.
Fig. 4 is a schematic structural diagram of an automation control system in a large-scale sewage treatment plant according to an embodiment of the present invention, and as shown in fig. 4, the automation control system in a large-scale sewage treatment plant according to the present invention adopts an industrial ethernet ring network based on TCP/IP protocol as a physical connection link. The looped network optical fiber switches are connected through optical fibers to form a backbone network.
The controller is used as the basis of an automatic control system and is arranged on the site and positioned on the site measurement and control layer. And a Siemens Programmable Logic Controller (PLC) is adopted, and the PLC is connected to a switch through a special Ethernet communication module to be physically connected with a central monitoring layer for data exchange. The field measurement and control layer comprises a plurality of controllers. The central monitoring layer can comprise two sets of data servers which are redundant and a plurality of terminals, the data servers collect and store data through the optical fiber switch of the field monitoring layer, and the terminals read and display the data of the data servers through the core switch. Specifically, the terminal may be an industrial personal computer.
In the annular network of the field measurement and control layer, parameter presetting is carried out on all controllers, a heartbeat packet with a parameter is sent between two adjacent controllers, the network communication quality is judged through comparison and verification of the heartbeat packet, and communication faults caused by network congestion are processed.
The automatic control system of the large sewage treatment plant can effectively monitor the network communication quality, early warn in real time and greatly reduce the risk of paralysis of the control system caused by network reasons; meanwhile, the occupied system resources are few, the burden is not caused to the system, and the real-time stability of data transmission between process automation systems in the control system of the sewage treatment plant can be effectively improved.
Fig. 5 is a schematic diagram of a high reliability network early warning system according to the present invention, as shown in fig. 5, including a control module 100, a detection module 200, a comparison module 300 and an early warning module 400, wherein,
The control module 100 is configured to execute step S10: s10, mutually transmitting preset heartbeat packet data blocks between two adjacent control stations are controlled, wherein the preset heartbeat packet data blocks of each control station comprise numbers, comparison bits and check bits.
The detection module 200 is configured to perform step S20: s20, detecting whether the current control station receives a preset heartbeat packet data block sent by the adjacent control station within preset time, and if so, executing the step S30; otherwise, the communication interruption of the position is judged, and a first early warning signal is sent.
The comparison module 300 is configured to perform step S30: s30, comparing the detected preset heartbeat packet data block received by the current control station with the preset heartbeat packet data block sent by the control station adjacent to the detected preset heartbeat packet data block, wherein the comparison comprises number comparison, comparison bit comparison and check bit comparison.
The early warning module 400 is configured to execute step S40: s40, when the comparison results are inconsistent, acquiring and identifying an abnormal identification bit returned by the current control site, judging that the bit communication is abnormal, and sending out a second early warning signal; and when the comparison results are consistent, acquiring and identifying the normal identification bit returned by the current control station, judging that the network communication is good, and repeatedly executing the step S10.
Specifically, the functions of the above modules may be described in detail with reference to the foregoing method embodiments, which are not repeated herein.
According to the high-reliability network early warning method and system provided by the invention, the heartbeat packet with the parameter is transmitted between two adjacent controllers, the network communication quality is judged through comparison and verification of the heartbeat packet, and when the network communication fails, the failure early warning is timely carried out, so that the operation reliability of the automatic control system can be effectively improved.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. The utility model provides a high reliability network early warning method, is applied to in large-scale sewage treatment plant automation control system, its characterized in that, automation control system includes centralized management system and a plurality of control website, a plurality of control website carry out data transmission with centralized management system through the industry ethernet looped netowrk of TCP IP protocol, industry ethernet looped netowrk adopts a plurality of looped netowrk optical fiber switches to pass through the optical fiber connection, the method includes following steps:
S10, mutually transmitting preset heartbeat packet data blocks between two adjacent control stations, wherein the preset heartbeat packet data blocks of each control station comprise a number, a comparison bit and a check bit;
S20, detecting whether the current control station receives a preset heartbeat packet data block sent by the adjacent control station within preset time, and if so, executing the step S30; otherwise, determining that the bit communication is interrupted, and sending out a first early warning signal;
s30, comparing the detected preset heartbeat packet data blocks received by the current control station with preset heartbeat packet data blocks sent by the control station adjacent to the current control station, wherein the comparison comprises number comparison, comparison bit comparison and check bit comparison;
S40, when the comparison results are inconsistent, acquiring and identifying an abnormal identification bit returned by the current control site, judging that bit communication is abnormal, and sending a second early warning signal; and when the comparison results are consistent, acquiring and identifying the normal identification bit returned by the current control station, judging that the network communication is good, and repeatedly executing the step S10.
2. The high-reliability network early warning method according to claim 1, wherein the preset heartbeat packet data block of each control station comprises a unique number and a comparison bit, and the check bit of each control station is generated by checking calculation according to a specific rule and the unique number and the comparison bit in the preset heartbeat packet data block.
3. The high reliability network early warning method according to claim 2, characterized in that the step of comparing the detected preset heartbeat packet data block received by the current control station with preset heartbeat packet data blocks sent by its neighboring control stations includes:
Firstly, comparing numbers in a preset heartbeat packet data block; when the number comparison is consistent, comparing the comparison bits in the preset heartbeat packet data; and when the comparison bit comparison is consistent, performing check bit comparison of a preset heartbeat packet data block.
4. A high reliability network early warning method according to any one of claims 1 to 3, characterized in that, after the step of obtaining and identifying the anomaly identification bit returned by the current control station, it further comprises:
Interrupting network communication between the current control station and the adjacent control station section;
And simultaneously controlling the current control station to continuously send a preset heartbeat packet data block to the adjacent control station until the abnormal identification bit returned by the current control station is obtained and identified to be normal, and then restoring the communication of the network.
5. The high-reliability network early warning method according to claim 1, characterized in that the centralized management system comprises two sets of mutually redundant data servers and a plurality of terminals, the data servers perform data transmission with a plurality of control sites through a double-layer industrial Ethernet ring, and the two sets of data servers perform data transmission with a plurality of terminals through an Ethernet switch.
6. The utility model provides a high reliability network early warning system, is applied to large-scale sewage treatment plant automation control system, its characterized in that, automation control system includes centralized management system and a plurality of control website, a plurality of control website carries out data transmission with centralized management system through the industry ethernet looped netowrk of TCP IP protocol, industry ethernet looped netowrk adopts a plurality of looped netowrk fiber switches to pass through the optical fiber connection, high reliability network early warning system is used for carrying out the high reliability network early warning method of any one of claims 1-5.
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