CN206470580U - safety programmable logic controller communication system - Google Patents
safety programmable logic controller communication system Download PDFInfo
- Publication number
- CN206470580U CN206470580U CN201621035721.7U CN201621035721U CN206470580U CN 206470580 U CN206470580 U CN 206470580U CN 201621035721 U CN201621035721 U CN 201621035721U CN 206470580 U CN206470580 U CN 206470580U
- Authority
- CN
- China
- Prior art keywords
- slave station
- control module
- data
- main website
- logic controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Programmable Controllers (AREA)
Abstract
The utility model discloses a kind of safety programmable logic controller communication system.Wherein, the safety programmable logic controller communication system includes：Main website and slave station；Wherein, main website, for sending request instruction to slave station according to default polling mechanism；Slave station, is connected with main website, the request instruction for receiving main website transmission, according to request instruction gathered data, and data is calculated, to the corresponding result of calculation of main website feedback data.The utility model is solved due to lacking in correlation technique that can not meet the technical problem of the communication requirement between PLC caused by the method communicated multiple PLC systems.
Description
Technical field
The utility model is related to communication technology application field, in particular to a kind of safety programmable logic controller
Communication system.
Background technology
Safety programmable logic controller (Programmable Logic Controller, abbreviation PLC) system is in oil transportation
Gas pipeline monitoring application is central, due to pipeline distance, multiple safety PLC systems can prolong pipeline be distributed in different positions and
It is distant, it is therefore desirable to which that mutually quickly communication is met with being constituted safe control loop between system between safety PLC system
Requirement to the response time.
For above-mentioned due to lacking in correlation technique PLC can not be met caused by the method communicated multiple PLC systems
Between communication requirement the problem of, effective solution is not yet proposed at present.
Utility model content
The utility model embodiment provide a kind of safety programmable logic controller communication system, with least solve due to
Lack in correlation technique the technology of the communication requirement between PLC can not be met caused by the method communicated multiple PLC systems
Problem.
According to the one side of the utility model embodiment, there is provided a kind of safety programmable logic controller communication system
System, applied to monitoring conveyance conduit, including：Main website and slave station；Wherein, main website, for being sent out according to default polling mechanism to slave station
Send request instruction；Slave station, is connected with main website, the request instruction for receiving main website transmission, according to request instruction gathered data, and
Data are calculated, to the corresponding result of calculation of main website feedback data.
Optionally, main website includes：Processing unit and transmission channel, wherein, processing unit is connected with transmission channel, is used for
The data of slave station feedback are received, and data are calculated by logical operation, the result of calculation of corresponding data is exported.
Further, optionally, processing unit includes：First main control module and the second main control module, wherein, the first master control
Module, the address for configuring correspondence control module in slave station, and the track data gathered according to address receive and control module；The
Two main control modules, the function for replicating the first main control module, to cause in the case where the first main control module delays machine, reception pair
The result of calculation for answering the control module of the first main control module to feed back.
Optionally, transmission channel includes：COM1, wherein, the input of COM1 and the transmission channel of slave station
Output end is connected, and the output end of COM1 is connected with the first main control module and/or the second main control module, for it is corresponding from
Control module communication in standing, communication includes：Request instruction is sent, the response feedback of corresponding requests instruction is received, receives address
Configuring request.
Optionally, processing unit includes：Operating system module, for controlling the first main control module and/or the second master control mould
Block.
Optionally, slave station includes：Transmission channel, comparator and processing unit, wherein, transmission channel, for gathering each
Data on circuit；Comparator, is connected with the output end of transmission channel, defeated for being compared to the data on each circuit
Go out comparative result；The input of processing unit and the output end of comparator are connected, for calculating comparative result.
Further, optionally, safety programmable logic controller communication system also includes：Collector and actuator, its
In, the input of collector and each connection, for gathering the data on each circuit；The output end and slave station of collector
Connection, for sending the data on each circuit to slave station；The input of actuator is connected by transmission channel with slave station, is used
Result of calculation after reception slave station voting.
In the utility model embodiment, pass through main website and slave station；Wherein, main website, for according to default polling mechanism to
Slave station sends request instruction；Slave station, is connected with main website, the request instruction for receiving main website transmission, according to request instruction collection
Data, and data are calculated, to the corresponding result of calculation of main website feedback data, the purpose communicated between multiple PLC systems has been reached, from
And the technique effect of lifting plc communication efficiency is realized, and then solve due to lacking in correlation technique multiple PLC systems
The technical problem of the communication requirement between PLC can not be met caused by the method for communication.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes the part of the application,
Schematic description and description of the present utility model is used to explain the utility model, does not constitute to of the present utility model improper
Limit.In the accompanying drawings：
Fig. 1 is the structural representation for the safety programmable logic controller communication system that the embodiment of the present application is provided；
Fig. 2 is a kind of structural representation for safety programmable logic controller communication system that the embodiment of the present application is provided；
Fig. 3 is the structural representation for another safety programmable logic controller communication system that the embodiment of the present application is provided
Figure；
Fig. 4 is the information exchange in another safety programmable logic controller communication system that the embodiment of the present application is provided
Schematic diagram；
Fig. 5 is the structural representation for another safety programmable logic controller communication system that the embodiment of the present application is provided
Figure；
Fig. 6 is the structural representation for another safety programmable logic controller communication system that the embodiment of the present application is provided
Figure；
Fig. 7 is the structural representation for another safety programmable logic controller communication system that the embodiment of the present application is provided
Figure；
Fig. 8 is that a kind of structure for safety programmable logic controller communication system link that the embodiment of the present application is provided is shown
It is intended to；
Fig. 9 is the structure for another safety programmable logic controller communication system link that the embodiment of the present application is provided
Schematic diagram.
Embodiment
In order that those skilled in the art more fully understand the utility model scheme, it is real below in conjunction with the utility model
The accompanying drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model part, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made all should
When the scope for belonging to the utility model protection.
According to the one side of the utility model embodiment, there is provided a kind of safety programmable logic controller communication system
System, Fig. 1 is the structural representation for the safety programmable logic controller communication system that the embodiment of the present application is provided, applied to monitoring
Conveyance conduit, including：
Main website 12 and slave station 14；Wherein, main website 12, for sending request instruction to slave station according to default polling mechanism；From
Stand 14, be connected with main website 12, the request instruction for receiving main website transmission according to request instruction gathered data, and calculates data,
To the corresponding result of calculation of main website feedback data.
Optionally, main website 12 includes：Processing unit and transmission channel, wherein, processing unit is connected with transmission channel, is used
Data are calculated in the data for receiving slave station feedback, and by logical operation, the result of calculation of corresponding data is exported.
Further, optionally, processing unit includes：First main control module and the second main control module, wherein, the first master control
Module, the address for configuring correspondence control module in slave station, and the track data gathered according to address receive and control module；The
Two main control modules, the function for replicating the first main control module, to cause in the case where the first main control module delays machine, reception pair
The result of calculation for answering the control module of the first main control module to feed back.
Optionally, transmission channel includes：COM1, wherein, the input of COM1 and the transmission channel of slave station
Output end is connected, and the output end of COM1 is connected with the first main control module and/or the second main control module, for it is corresponding from
Control module communication in standing, communication includes：Request instruction is sent, the response feedback of corresponding requests instruction is received, receives address
Configuring request.
Optionally, processing unit includes：Operating system module, for controlling the first main control module and/or the second master control mould
Block.
Optionally, slave station includes：Transmission channel, comparator and processing unit, wherein, transmission channel, for gathering each
Data on circuit；Comparator, is connected with the output end of transmission channel, defeated for being compared to the data on each circuit
Go out comparative result；The input of processing unit and the output end of comparator are connected, for calculating comparative result.
Further, optionally, safety programmable logic controller communication system also includes：Collector and actuator, its
In, the input of collector and each connection, for gathering the data on each circuit；The output end and slave station of collector
Connection, for sending the data on each circuit to slave station；The input of actuator is connected by transmission channel with slave station, is used
Result of calculation after reception slave station voting.
Based on above-mentioned, the safety programmable logic controller communication system that the embodiment of the present application is provided is specific as follows：
Communication connection topology between safety PLC system is as shown in Fig. 2 one kind safety that Fig. 2, which is the embodiment of the present application, to be provided can
The structural representation of programmed logic controller communication system：Communication uses Ethernet between safety PLC system, and communication task is by individual system
Main control module in system is responsible for, main control module redundant configuration, each controller provide four Ethernet interfaces (A1, A2, B1,
B2), communication link redundancy is realized while realizing safety return circuit doubleization structure.A1 and B1, A2 and B2 are respectively redundancy relationship, A1
It is doubleization relation between B1 and A2 and B2.The network equipment of standard, such as interchanger or router are used when disposing at the scene.
Communications protocol is based on specifying a system as main website in principal and subordinate's poll, multiple safety PLC systems, and remaining system is slave station,
The periodic of main website active conducts interviews to all slave stations, only when main website conducts interviews to some slave station, this slave station
Could be passive toward sending datagram in bus, in the case where main website does not conduct interviews to it, slave station only carries out oneself
The data acquisition and processing (DAP) of internal system, does not send data in bus.
1. address is distributed
Communication is principal and subordinate's poll based on Ethernet between safety PLC system, therefore the Ethernet interface of each slave station has
There is unique IP address, recognize whether main website conducts interviews to oneself with this.Needed in communication initialization to all
System distribution IP address, the IP address of main website by human configuration, the IP address of slave station by main website according to the station address of slave station from
Dynamic distribution, the toggle switch of the station address of slave station in each slave station determines and consistent with system configuration that the station address of slave station is also
Unique (two main control module correspondences, two different tributary address in slave station system), main website is obtained according to configuration info
Station address information.After the completion of system configuration, do not allow to add new equipment, because main website will not be distributed to new equipment again
IP address.
As shown in figure 3, Fig. 3 is another safety programmable logic controller communication system that the embodiment of the present application is provided
Structural representation, safety PLC system 1 is main website, and safety PLC system 2 is slave station.Main website is according to internal distribution algorithm to slave station point
With IP address and ensure the uniqueness of IP address.The IP address distribution of main website and slave station is as shown in table 1.
Table 1
The IP address of each slave station Ethernet interface distributes the independent progress simultaneously on respective link (A1, B1, A2, B2), point
It is identical with mechanism.By taking the Ethernet interface A1 (being represented with S3_A1) of slave station 3 IP address distribution as an example, including 5 steps, Fig. 4
It is the information exchange schematic diagram in another safety programmable logic controller communication system that the embodiment of the present application is provided, such as schemes
Shown in 4：
(1) S3_A1 sends in broadcast packet, request main website distribution IP address, broadcast packet and uses the station address 3 of oneself to lead
Identification of standing is the request of which slave station；
(2) main website is received after the broadcast packet of IP address requesting, the station address 3 in broadcast packet, secondary IP address allocation table
In take the corresponding IP address of station address (IP3.1) and the IP address (IP1.1) of main website, sent, still wrapped in unicast packet with unicast
The station address 3 of the slave station after containing；
(3) S3-A1 receives the tributary address in unicast packet, parsing broadcast packet, if address is consistent with the station address of oneself,
Then the IP address (IP3.1 and IP1.1) in wrapping is preserved, then sent to master control do not used in response, response message from
The station address stood, but use the IP address (IP3.1) obtained as source address, using main website IP address (IP1.1) as
Destination address；
(4) main website receives S3_A1 confirmation message, marks the IP address to be allocated successfully in IP address allocation table, then
Confirmation message (using IP address) is sent to S3-A1；
(5) S3-A1 is received after main website confirmation message, is no longer asked on the link, in silent status, waits normal fortune
By main website poll during row.
2. doubleization is designed
Reached between many PLC systems safe control loop (collection->Transmission->Computing->Transmission->Output) set using doubleization
Meter.As shown in figure 5, Fig. 5 is the structure for another safety programmable logic controller communication system that the embodiment of the present application is provided
Schematic diagram, safety PLC system 2 as slave station, doubleization acquisition channel simultaneously the data of collection site and in each passage to adopting
Collection result is compared, and comparative result is sent to its internal system dual processing unit by the transmission channel of doubleization；Peace
Full PLC system 1 reads gathered data as main website by the transmission channel of doubleization, to the data of collection at the place of doubleization
Logical operation is carried out in reason unit；Doubleization of channel transfer to safety PLC system 3 that the result of computing passes through doubleization is handled
Unit, then transmitted by processing unit by the transmission channel of doubleization to the output channel of doubleization, the output channel of doubleization
Data according to each obtaining are put to the vote, and voting result is exported to actuator.
In the safe control loop of doubleization, each cell operation state to loop is diagnosed, the result of diagnosis
Also output result that can be final on safety PLC system 3 produces influence, it is to avoid because safe control loop fail to perform peace
Global function.
3. redundancy scheme
Communicated between many safety PLC systems with principal and subordinate's polling mechanism, communication network and main control module support redundant configuration.As schemed
Shown in 4, A and B are redundancy relationship, and 1 and 2 are doubleization relation, are run while doubleization relation.Safety PLC system
The activestandby state of two internal main control modules is determined by two modules according to the diagnostic message of oneself and other side.Main website according to point
The IP address prepared sets up communication link mapping table, is led in communication according to each Link State from mapping table selection respective links
News.Based on redundant configuration and doubleization structure, main website is that each slave station safeguards 16 communication links, as shown in table 2.Master during operation
Main control module selects corresponding link to be communicated according to Link State and module status in standing.
Table 2
| Link | Mapping relations | Link | Mapping relations |
| 1 | 1.1<==>3.1 | 9 | 1.1<==>4.1 |
| 2 | 1.2<==>3.2 | 10 | 1.2<==>4.2 |
| 3 | 1.3<==>3.3 | 11 | 1.3<==>4.3 |
| 4 | 1.4<==>3.4 | 12 | 1.4<==>4.4 |
| 5 | 2.1<==>3.1 | 13 | 2.1<==>4.1 |
| 6 | 2.2<==>3.2 | 14 | 2.2<==>4.2 |
| 7 | 2.3<==>3.3 | 15 | 2.3<==>4.3 |
| 8 | 2.4<==>3.4 | 16 | 2.4<==>4.4 |
1) normal communication：As shown in fig. 6, Fig. 6 is another safe programmable logic control that the embodiment of the present application is provided
The structural representation of device communication system, after system starts, the master control A in main website is primary module, and master control B is standby module (in main website
Primary module be responsible for sending request message, receive response message and computing, standby module is only responsible for receiving response message and computing)；
Master control A in slave station is primary module, and master control B is standby module；Master control A selection links 1 and link 3 in main website are primary link,
Unitcast request message is sent on the two links simultaneously.Master control A in slave station receives message, is sent out simultaneously on link 1 and link 3
Sending the master control A in broadcast response message, main website to receive the master control B in response message, main website can also receive on link 5 and link 7
To this broadcast response message.Main website sends diagnostic message message on the remaining links simultaneously, and the shape of other links is safeguarded with this
State.
2) communication under network failure situation：As shown in fig. 7, Fig. 7 is that another safety that the embodiment of the present application is provided can
The structural representation of programmed logic controller communication system, if the failure of link 1 and link 2 are normal, is switched on link 2,
Master control A selection links 2 and link 3 in main website are primary link, send unitcast request message simultaneously on the two links.Slave station
In master control A receive on request message, link 2 and link 3 and meanwhile the master control A sent in broadcast response message, main website receive should
The master control B answered in message, main website can also receive broadcast response message on link 6 and link 7.Main website is while on the remaining links
Diagnostic message message is sent, the state of other links is safeguarded with this.
Other link switching principles for being mutually redundant relation arrive the switching of link 2 with link 1.
3) the redundancy switching of main control module
A. main control module switches in main website：As shown in figure 8, Fig. 8 is a kind of safe programmable that the embodiment of the present application is provided
The structural representation of logic controller communication system link, if in main website master control A failures (CPU1 failures, CPU2 failures,
A1 and B1 simultaneous faults, A2 and B2 simultaneous faults, one of them generation), then main control module switches in main website, master control A drops
For from master control B is upgraded to master, and master control B selects respective link poll to access slave station according to Link State.Principle of Communication and switching and master
Control A identical.
Master switching in b slave stations：Patrolled as shown in figure 9, Fig. 9 is another safe programmable that the embodiment of the present application is provided
The structural representation of volume controller communication system link, if master control A failures in slave station (CPU1 failures, CPU2 failures, A1 and
B1 simultaneous faults, A2 and B2 simultaneous faults, one of them generation), master control A and master control B are switched, and master control A is dropped from master control B
Master is risen, and when main website is by respective link polling master B, response message is sent to main website.The response report of slave station main control module
Text includes its current master slave mode, and this status information determines corresponding operation in main website analytic message.
Realized in the safety programmable logic controller communication system that the embodiment of the present application is provided between safety PLC system
Doubleization safe control loop, improves security；Communication uses principal and subordinate's polling mechanism based on 100M Ethernets, and reduction system is rung
Between seasonable.Communication uses link and module dual redundant structure, improves the reliability of communication；
Doubleization control loop is to sum up realized between safety PLC system, security is improved；Communication is used based on 100M ether
Principal and subordinate's polling mechanism of net, reduces system response time.Communication uses link and module dual redundant structure, improves the reliable of communication
Property.
Above-mentioned the utility model embodiment sequence number is for illustration only, and the quality of embodiment is not represented.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (6)
1. a kind of safety programmable logic controller communication system, it is characterised in that applied to monitoring conveyance conduit, including：
Main website and slave station；Wherein,
The main website, for sending request instruction to the slave station according to default polling mechanism；
The slave station, is connected with the main website, for receiving the request instruction that the main website is sent, is adopted according to the request instruction
Collect data, and calculate the data, the corresponding result of calculation of the data is fed back to the main website；
Wherein, the slave station includes：Transmission channel, comparator and processing unit, wherein, the transmission channel is each for gathering
Data on individual circuit；The comparator, is connected with the output end of the transmission channel, for the number on each described circuit
According to being compared, comparative result is exported；The input of the processing unit is connected with the output end of the comparator, for calculating
The comparative result.
2. safety programmable logic controller communication system according to claim 1, it is characterised in that the main website bag
Include：Processing unit and transmission channel, wherein, the processing unit is connected with the transmission channel, anti-for receiving the slave station
The data of feedback, and the data, the result of calculation of the output correspondence data are calculated by logical operation.
3. safety programmable logic controller communication system according to claim 2, it is characterised in that the processing unit
Including：First main control module and the second main control module, wherein,
First main control module, the address for configuring correspondence control module in the slave station, and received according to the address
The track data of the control module collection；
Second main control module, the function for replicating first main control module, to cause in first main control module
Delay in the case of machine, receive the result of calculation of the control module feedback of correspondence first main control module.
4. safety programmable logic controller communication system according to claim 3, it is characterised in that the transmission channel
Including：COM1, wherein, the input of the COM1 is connected with the output end of the transmission channel of the slave station, described
The output end of COM1 is connected with first main control module and/or second main control module, for it is corresponding described
Control module communication in slave station, the communication includes：Send the request instruction, receive the response of the correspondence request instruction
Feedback, reception address configuration request.
5. safety programmable logic controller communication system according to claim 3, it is characterised in that the processing unit
Including：Operating system module, for controlling first main control module and/or second main control module.
6. safety programmable logic controller communication system according to claim 1, it is characterised in that the safety can be compiled
Journey logic controller communication system also includes：Collector and actuator, wherein,
The input of the collector and each described connection, for gathering the data on each described circuit；It is described to adopt
The output end of storage is connected with the slave station, for sending the data on each described circuit to the slave station；
The input of the actuator is connected by the transmission channel with the slave station, for receiving after the slave station voting
The result of calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621035721.7U CN206470580U (en) | 2016-08-31 | 2016-08-31 | safety programmable logic controller communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621035721.7U CN206470580U (en) | 2016-08-31 | 2016-08-31 | safety programmable logic controller communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206470580U true CN206470580U (en) | 2017-09-05 |
Family
ID=59709513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621035721.7U Active CN206470580U (en) | 2016-08-31 | 2016-08-31 | safety programmable logic controller communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206470580U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109947042A (en) * | 2019-03-27 | 2019-06-28 | 北京龙鼎源科技股份有限公司 | Polling method and device, storage medium, the electronic device of I/O module |
| CN110601892A (en) * | 2019-09-18 | 2019-12-20 | 南方电网科学研究院有限责任公司 | Main module access method, device and equipment based on object-oriented protocol |
| CN111580454A (en) * | 2020-06-28 | 2020-08-25 | 山东省计算中心（国家超级计算济南中心） | Safety control method of industrial safety PLC (programmable logic controller) |
| CN115933513A (en) * | 2022-12-02 | 2023-04-07 | 中交一航局安装工程有限公司 | Discrete bulk cargo wharf PLC system based on 5G transmission |
-
2016
- 2016-08-31 CN CN201621035721.7U patent/CN206470580U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109947042A (en) * | 2019-03-27 | 2019-06-28 | 北京龙鼎源科技股份有限公司 | Polling method and device, storage medium, the electronic device of I/O module |
| CN110601892A (en) * | 2019-09-18 | 2019-12-20 | 南方电网科学研究院有限责任公司 | Main module access method, device and equipment based on object-oriented protocol |
| CN110601892B (en) * | 2019-09-18 | 2022-04-29 | 南方电网科学研究院有限责任公司 | Main module access method, device and equipment based on object-oriented protocol |
| CN111580454A (en) * | 2020-06-28 | 2020-08-25 | 山东省计算中心（国家超级计算济南中心） | Safety control method of industrial safety PLC (programmable logic controller) |
| CN115933513A (en) * | 2022-12-02 | 2023-04-07 | 中交一航局安装工程有限公司 | Discrete bulk cargo wharf PLC system based on 5G transmission |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206470580U (en) | safety programmable logic controller communication system | |
| CN106444602A (en) | Security programmable logic controller communication system and communication method | |
| CN101378334B (en) | Communication method based on dual-network redundant universal network model | |
| CN105450489B (en) | The preferential efficient field bus systems of HEBus and communication means for realizing most short message of output | |
| CN203747852U (en) | Industrial communication-network communication equipment for redundant operation | |
| CN103067206A (en) | Internet of things across-machine room distributed type full automatic hot standby server switching system | |
| CN103297309A (en) | Communication device for a redundantly operable industrial communication network and method for operating the communication device | |
| CN205666856U (en) | Train level ethernet switching equipment and system | |
| CN102096407A (en) | Chain type STATCOM control system based on EtherCA technology | |
| CN102664719A (en) | Distributed secure transmission method applied to distributed control system (DCS) | |
| CN102170342A (en) | IEC (integrated Ethernet chip) 104 communication host-standby switching method under high redundancy configuration | |
| CN102123110B (en) | Data transmission method for gateway system, and gateway system | |
| CN101394301A (en) | Micro general hardware platform system, apparatus for telecommunication and computer, and communication method thereof | |
| CN101714945A (en) | System and method for realizing internetwork communication | |
| CN105515835B (en) | A kind of aerospace TTE network system grade gateways with communication integrity audit function | |
| CN111865704A (en) | Data transmission method, system and network equipment | |
| CN103200067A (en) | Dynamic virtual LANs to segregate data | |
| CN103036724A (en) | State information transmission method and network equipment and combination equipment | |
| CN203563079U (en) | Communication device used for industrial communication network which can be operated in redundant manner | |
| CN103685610A (en) | Method for achieving Address Resolution Protocol (ARP) proxy | |
| CN103777579B (en) | A kind of nuclear power station TG and DCS communication system and method | |
| CN211454255U (en) | Device for automatically switching main server and standby server | |
| CN101009653A (en) | The method for sending message and the system for switching device and main and standby switching | |
| CN107995315A (en) | Synchronous method, device, storage medium and the computer equipment of business board-to-board information | |
| CN208257855U (en) | Electric power networks data transmission system with duplex channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |