CN102231073B - Network redundancy communication method, apparatus and system thereof - Google Patents

Network redundancy communication method, apparatus and system thereof Download PDF

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Publication number
CN102231073B
CN102231073B CN201110142501XA CN201110142501A CN102231073B CN 102231073 B CN102231073 B CN 102231073B CN 201110142501X A CN201110142501X A CN 201110142501XA CN 201110142501 A CN201110142501 A CN 201110142501A CN 102231073 B CN102231073 B CN 102231073B
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plc
network
network redundancy
main
redundancy
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CN102231073A (en
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宋小莉
聂占文
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Beijing Hollysys Co Ltd
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Beijing Hollysys Co Ltd
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Abstract

The invention, which relates to the communication field, provides a network redundancy communication method, apparatus and system thereof. A problem of high costs of hardware in redundant dual-network can be solved. The method comprises the following steps that: a monitoring computer determines current main PLC from a network redundancy PLC group; the monitoring computer communicates with the main PLC. The technical scheme provided in the invention is suitable for building automation system (BAS). And communication with low costs can be realized.

Description

Network redundancy communication means, device and system
Technical field
The present invention relates to the communications field, relate in particular to network redundancy communication means, device and system in environment in a kind of urban track traffic and supervisory system (being called for short BAS:Building Automation System).
Background technology
In City Rail Transit System, environment and supervisory system are one of them important subsystems, and its normal operation can reach the purpose of building good a home from home, reducing energy resource consumption, saving manpower, raise the management level.
The main monitored object of environment and supervisory system comprises: ventilating system, air-conditioning, refrigeration system, supply and drain water system, illuminator, Passenger Guiding System, Escalator system, shield door and anti-flood etc.
The basic function that environment and supervisory system have has: electromechanical equipment is monitored, execution is taken precautions against natural calamities and the management of blocking model, environmental monitoring and energy-saving run management, environment and equipment.So the BAS system possesses plant automation and monitoring management two aspect functions simultaneously.And the plant automation function be take single device control as basis, towards be production run, as equipment operation optimum control, equipment interlocking control, equipment group control, operating mode judgement and switching controls, artificial atmosphere control, timetable scheduling controlling etc.The plant automation function, based on PLC system and fieldbus, is mainly realized by PLC and monitoring software.
In the BAS system, in order to complete reliably the monitoring function of BAS, general PLC is configured to two frames of redundancy, and the two nets of each frame configuring redundancy and supervisory control comuter communicate.The configuration of typical station as shown in Figure 1.
Two networks are arranged in Fig. 1: one is the key-course network, and one is the supervisory layers network.Wherein:
The key-course network is to adopt to control net (ControlNet), and dual bus type topological structure (redundant configuration is A net and B net), between each PLC controller of station and remote I/O, for reaching the transmission of real time data between controller and IO between each controller.Redundancy and the switching of controlling net are completed by equipment self, in the engineering application, do not need to do extra work.
The supervisory layers network is based on Ethernet and realizes, dual star topology structure (redundant configuration), between station master PLC controller, station monitor workstation and communication processor, for the transmission of monitor message.
Supervisory control comuter directly accesses the supervisory layers network by two nets.
PLC is comprised of two frames, and a CPU module is arranged on each frame, controls net module CNBR for one, two ethernet module ENBT, and a PLC synchronization module SRM, two SRM modules are carried out synchronous between two PLC by optical fiber.Can realize automatically switching by its internal fault self check between active and standby PLC, also can carry out the non-fault force handoff by the PLC application program simultaneously.
All need to have two ethernet modules on every cover PLC frame in Fig. 1, a station need to configure four ethernet modules, and a subway line may have tens or tens stations, the number of the ethernet module altogether needed so completely will reach tens even up to a hundred, and corresponding hardware cost has just increased.In order to reduce hardware cost, can realize again that computing machine passes through communicating by letter of two nets and redundant PLC, the collocation form of an Ethernet card on a kind of each PLC frame of special proposition simultaneously.
Summary of the invention
The invention provides a kind of network redundancy communication means, device and system, solved the two higher problems of net hardware cost of redundancy.
A kind of network redundancy communication means comprises:
Supervisory control comuter is determined current main PLC from network redundancy PLC group;
Described supervisory control comuter and described main PLC communicate.
Preferably, each PLC in described network redundancy PLC group all is connected with described supervisory control comuter by heterogeneous networks independently, all is equipped with an ethernet module on each PLC.
Preferably, the job information of described supervisory control comuter each PLC from network redundancy PLC group, determine that current main PLC comprises:
In the described network redundancy PLC group of described monitoring calculation machine check, whether network corresponding to each PLC is communicated with, and when the network that each PLC is corresponding in described network redundancy PLC group all is not communicated with, sends fault warning;
Described supervisory control comuter reads the job information of the PLC of map network connection, and described job information comprises current main PLC sign and this PLC sign;
When the value of the current main PLC sign of the PLC be communicated with at described map network is all consistent, determine that the PLC that described current main PLC ident value points to is main PLC, or the value of the current main PLC sign of the PLC be communicated with at described map network is when inconsistent, the PLC that described the PLC ident value of take changes is main PLC.
Preferably, above-mentioned network redundancy communication means also comprises:
Each PLC in described network redundancy group is according to the current main PLC ident value that the negotiation result renewal is stored separately each other, and described current main PLC ident value points to the main PLC in this network redundancy group;
Main PLC in described network redundancy group, according to the preset PLC update cycle, changes this PLC ident value of this main PLC storage.
Preferably, above-mentioned network redundancy communication means also comprises:
When system initialization, monitoring period is set, indicates described supervisory control comuter to determine once main PLC in each monitoring period.
The present invention also provides a kind of network redundancy communicator, comprising:
The PLC driver module, for determining current main PLC from network redundancy PLC group;
Communication module, for communicating with the definite PLC of described PLC driver module.
Preferably, described PLC driver module comprises:
Whether the Network Check unit, be communicated with for checking network corresponding to described each PLC of network redundancy PLC group; When the network that each PLC is corresponding is not communicated with, send fault warning;
Information acquisition unit, for reading the job information of the PLC that map network is communicated with, described job information comprises current main PLC sign and this PLC sign;
Comparing unit, when all consistent for the value of the current main PLC sign of the PLC that is communicated with at described map network, determine that the PLC that described current main PLC ident value points to is main PLC; When the value of the current main PLC sign of the PLC be communicated with at described map network is inconsistent, the PLC that described the PLC ident value of take changes is main PLC.
The present invention also provides a kind of network redundancy communication system, comprise the network redundancy PLC group under above-mentioned network redundancy communicator and the control of this network redundancy communicator, described network redundancy PLC group comprises at least two PLC, and in described at least two PLC, a main PLC is arranged.
Preferably, each PLC in described network redundancy PLC group all is connected with described supervisory control comuter by heterogeneous networks independently, is equipped with an ethernet module on each PLC.
Preferably, current main PLC sign and this PLC sign of described PLC for upgrading this PLC storage is specially:
Each PLC in described network redundancy group, for the current main PLC ident value according to the negotiation result renewal is stored separately each other, described current main PLC ident value points to the main PLC in this network redundancy group;
Main PLC in described network redundancy group, also for the PLC update cycle according to preset, change this PLC ident value of this main PLC storage.
The invention provides a kind of network redundancy communication means, device and system, supervisory control comuter is determined current main PLC from network redundancy PLC group, described supervisory control comuter and described main PLC communicate afterwards, the management and supervision computing machine of redundant network PLC group and communicating by letter of main PLC in the corresponding single network situation of each PLC have been realized, because supervisory control comuter can be determined the main PLC in network redundancy PLC group, therefore do not need for the two nets of PLC configuring redundancy, reduced the quantity of ethernet module ENBT in PLC, solved the higher problem of existing double-network redundant hardware cost.
The accompanying drawing explanation
Fig. 1 is typical station arrangement plan in prior art;
The structural representation of a kind of PLC that Fig. 2 provides for embodiments of the invention;
The schematic network structure of a kind of network redundancy communication system that Fig. 3 provides for embodiments of the invention;
The structural representation of a kind of network redundancy communicator that Fig. 4 provides for embodiments of the invention;
Fig. 5 is the redundancy communication network structural representation will be integrated in network redundancy communicator in supervisory control comuter in embodiments of the invention and be applied to network service the time;
The process flow diagram of a kind of network redundancy communication means that Fig. 6 provides for embodiments of the invention two;
The particular flow sheet that Fig. 7 is step 602 in Fig. 6;
The schematic diagram that Fig. 8 is supervisory control comuter judgement communication link.
Embodiment
In order to solve the problem that the double-network redundant hardware cost is higher, embodiments of the invention provide a kind of network redundancy communication means, device and system.
Hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that do not conflict, the embodiment in the application and the feature in embodiment be combination in any mutually.
At first, embodiments of the invention one are described.
Embodiments of the invention provide a kind of PLC, and than the PLC in the double-network redundant system, the PLC that embodiments of the invention provide only needs an ENBT module, has saved hardware resource, and its structure as shown in Figure 2.
Embodiments of the invention also provide a kind of network redundancy communication system, the structure of this system as shown in Figure 3, comprise the network redundancy PLC group 302 under network redundancy communicator 301 and the control of this network redundancy communicator, described network redundancy PLC group comprises at least two PLC303, and in described at least two PLC, a main PLC is arranged.
Preferably, current main PLC sign and this PLC sign of described PLC303 for upgrading this PLC storage is specially:
Each PLC in described network redundancy group, for the current main PLC ident value according to the negotiation result renewal is stored separately each other, described current main PLC ident value points to the main PLC in this network redundancy group;
Main PLC in described network redundancy group, also for the PLC update cycle according to preset, change this PLC ident value of this main PLC storage.
The related PLC of embodiments of the invention all as shown in Figure 2.
Network redundancy communication apparatus structure in Fig. 3 as shown in Figure 4, comprising:
PLC driver module 401, for determining current main PLC from network redundancy PLC group;
Communication module 402, for communicating with the definite PLC of described PLC driver module.
Preferably, described PLC driver module 401 comprises:
Whether Network Check unit 4011, be communicated with for checking network corresponding to described each PLC of network redundancy PLC group;
Information acquisition unit 4012, for reading the job information of the PLC that map network is communicated with, described job information comprises current main PLC sign and this PLC sign;
Comparing unit 4013, when all consistent for the value of the current main PLC sign of the PLC that is communicated with at described map network, determine that the PLC that described current main PLC ident value points to is main PLC.
Preferably, described comparing unit 4013, when also inconsistent for the value of the current main PLC sign of the PLC that is communicated with at described map network, the PLC that described the PLC ident value of take changes is main PLC;
Described Network Check unit 4011, while also all not being communicated with for the network corresponding at described each PLC of network redundancy PLC group, send fault warning.
In the embodiment of the present invention, this network redundancy communicator is integrated in supervisory control comuter, PLC by supervisory control comuter and its lower management communicates, all by one, with other PLC, independently network and this supervisory control comuter communicate each PLC, as shown in Figure 5, Fig. 5 be take two PLC (PLC1 and PLC2), and to form network redundancy PLC group be example to the network architecture.Compared to Figure 1, only have an ethernet module ENBT in Fig. 5 on each PLC, these two ethernet modules access respectively in the network that two different network segments are corresponding, as, access the different network segments.In the embodiment of the present invention, two network segments are respectively 171 and 172.
The real-time Communication for Power of monitoring calculation owner PLC, obtain the upstream data in PLC, revises the downlink data in PLC; After master-slave swap has occurred because of certain reason in PLC, with communicating by letter without impact between main PLC; When cross faults occurs when, can by with PLC carry out alternately the network switching, or make PLC carry out master-slave swap.
Below in conjunction with accompanying drawing, embodiments of the invention two are described.
The embodiment of the present invention provides a kind of network redundancy communication means, the network redundancy communication system that its applied environment provides for the embodiment of the present invention one or the redundancy communication network shown in Fig. 5.The embodiment of the present invention be take the network of redundancy communication shown in Fig. 5 and is described as example, and the flow process of using the method to complete network redundancy device (monitoring calculation pusher side) and network redundancy PLC group communication as shown in Figure 6, comprising:
Step 601, when system initialization, monitoring period is set, indicates described supervisory control comuter to determine once main PLC in each monitoring period;
Step 602, supervisory control comuter are determined current main PLC from network redundancy PLC group;
This step specifically as shown in Figure 7, comprising:
In step 6021, the described network redundancy PLC group of described monitoring calculation machine check, whether network corresponding to each PLC is communicated with;
In the embodiment of the present invention, when PLC1 is main PLC, supervisory control comuter can only communicate by 171 network segment networks and PLC1; When PLC2 is main PLC, supervisory control comuter can only communicate by 172 network segment networks and PLC2.
In this step, when the network that each PLC is corresponding in described network redundancy PLC group all is not communicated with, send fault warning.
Step 6022, described supervisory control comuter read the job information of the PLC of map network connection, and described job information comprises current main PLC sign and this PLC sign;
In the embodiment of the present invention, obtain main PLC and communicate with it parallel with supervisory control comuter, each PLC in described network redundancy group is according to the current main PLC ident value that the negotiation result renewal is stored separately each other, and described current main PLC ident value points to the main PLC in this network redundancy group; Main PLC in described network redundancy group, according to the preset PLC update cycle, changes this PLC ident value of this main PLC storage.
For example, if original PLC1 is main PLC, supervisory control comuter carries out proper communication by 171 network segment networks and PLC1, rear because certain reason, supervisory control comuter and 171 network segment networks disconnect, and 172 network segment networks are normal, and master-slave swap should occur the PLC in network redundancy PLC group, making PLC2 is main PLC, and corresponding supervisory control comuter also should switch to by 172 network segments and PLC2 and communicate.
Concrete realizes that principle is as follows:
Two document numbers of definition in PLC, F998 and F999.
1) F998 is the INT type file of an element, its value is carried out periodicity by supervisory control comuter according to the first period of change (revising the time interval of F998 in the supervisory control comuter driver module) and is revised, each modification value adds 1, after being added to maximal value, value becomes 0, and maximal value that can this INT type file is set to 65535.The first period of change is configurable.If main PLC is at the multiple of period of change in the time, this value changes, and thinks that supervisory control comuter is normal with communicating by letter of main PLC; If this value does not change, think the disconnection of communicating by letter of supervisory control comuter and main PLC, PLC should initiatively carry out master-slave swap.
2) F999 is the INT type file of two elements, and its value is revised by PLC, by supervisory control comuter, obtains its value explanation.The value implication of first element:
1---the PLC frame on 171 network segments is main;
2---the PLC frame on 172 network segments is main.
The value of second element is periodically revised according to the second period of change (in PLC, trapezoid figure program is revised the time interval of F999) by PLC, and general only main PLC revises second element value in the F999 file, and each modification value adds 1.If in the time, this value does not change, and means that this PLC is not main PLC at the multiple of the second period of change.Because on PLC after master-slave synchronisation, supervisory control comuter can not with set up and to communicate by letter from PLC, but when principal and subordinate PLC is asynchronous, supervisory control comuter can be read the value of F999 by principal and subordinate PLC, but the value of F999 file the second element is constant from PLC, so judge that by the variation of this value which PLC is main PLC.
The value that supervisory control comuter obtains the F999 file is also periodically, claims this cycle for the cycle of obtaining.Generally, the cycle of obtaining is longer than the second period of change.For example, the second period of change of revising F999 in PLC is Millisecond (a few tens of milliseconds or hundreds of millisecond), and supervisory control comuter to read the cycle of obtaining of F999 be a second level.
When the value of the current main PLC sign of step 6023, the PLC that is communicated with at described map network is all consistent, determine that the PLC that described current main PLC ident value points to is main PLC;
When the value of the current main PLC sign of step 6024, the PLC that is communicated with at described map network is inconsistent, the PLC that described the PLC ident value of take changes is main PLC.
Still with in step 6022 to the example that is illustrated as of specific implementation, the concrete determination methods of step 6023 and step 6024 is as follows:
Supervisory control comuter reads the value of a F999 by two networks, obtain F999 return to numerical value after, communicate the judgement of link, as shown in Figure 8.
The communications status numeric representation of supervisory control comuter and PLC, definable one network state parameter, whether this parameter has 0 and 1 two kind of value, for meaning supervisory control comuter, with the network between a certain PLC, be communicated with.If the monitoring calculation function is read the data on PLC, think and this PLC between network-in-dialing, the network state parameter value is 1, if can not read data think that this network disconnects, the network state parameter value is 0.
If two Network Communication state values are all 1, the two nets of explanation all lead to, and compare the value of first element of F999 again, if the two value is identical, active link is exactly the link of this value representation; If the two value is not identical, the value of checking second element of F999, if this value of certain network has changed, this network is activity network, the link between the PLC corresponding with this network is active link; Otherwise there is no active link.
If one of two Network Communication state parameter value be 1 another be 0, explanation only has a network-in-dialing, then checks whether second element value of the PLCF999 of logical link changes, if change, this link is active link, otherwise there is no active link.
If two Network Communication state values are all 0, the two nets of explanation all disconnect, and there is no active link.
If found active link, drive and just on this link, carry out work, otherwise, think with PLC between the disconnection of communicating by letter.
Step 603, described supervisory control comuter and described main PLC communicate.
Embodiments of the invention provide a kind of network redundancy communication means, device and system, supervisory control comuter is determined current main PLC from network redundancy PLC group, described supervisory control comuter and described main PLC communicate afterwards, the management and supervision computing machine of redundant network PLC group and communicating by letter of main PLC in the corresponding single network situation of each PLC have been realized, because supervisory control comuter can be determined the main PLC in network redundancy PLC group, therefore do not need for the two nets of PLC configuring redundancy, reduced the quantity of ethernet module ENBT in PLC, solved the higher problem of existing double-network redundant hardware cost.Can communicate link information between supervisory control comuter and PLC mutual, so that supervisory control comuter is passed on the information of the work at present network segment to PLC, PLC is transmitted as the information of main PLC to monitoring module.
The all or part of step that one of ordinary skill in the art will appreciate that above-described embodiment can realize by the computer program flow process, described computer program can be stored in a computer-readable recording medium, described computer program (as system, unit, device etc.) on corresponding hardware platform is carried out, when carrying out, comprise step of embodiment of the method one or a combination set of.
Alternatively, all or part of step of above-described embodiment also can realize with integrated circuit, and these steps can be made into respectively integrated circuit modules one by one, or a plurality of modules in them or step are made into to the single integrated circuit module realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Each device/functional module/functional unit in above-described embodiment can adopt general calculation element to realize, they can concentrate on single calculation element, also can be distributed on the network that a plurality of calculation elements form.
The form of software function module of usining each device/functional module/functional unit in above-described embodiment realizes and during as production marketing independently or use, can be stored in a computer read/write memory medium.The above-mentioned computer read/write memory medium of mentioning can be ROM (read-only memory), disk or CD etc.
Anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the described protection domain of claim.

Claims (8)

1. a network redundancy communication means, is characterized in that, comprising:
Supervisory control comuter is determined current main PLC from network redundancy PLC group, comprising:
In the described network redundancy PLC group of described monitoring calculation machine check, whether network corresponding to each PLC is communicated with, and when the network that each PLC is corresponding in described network redundancy PLC group all is not communicated with, sends fault warning,
Described supervisory control comuter reads the job information of the PLC of map network connection, and described job information comprises current main PLC sign and this PLC sign,
When the value of the current main PLC sign of the PLC be communicated with at described map network is all consistent, determine that the PLC that described current main PLC ident value points to is main PLC, or the value of the current main PLC sign of the PLC be communicated with at described map network is when inconsistent, the PLC that described the PLC ident value of take changes is main PLC;
Described supervisory control comuter and described main PLC communicate.
2. network redundancy communication means according to claim 1, is characterized in that, each PLC in described network redundancy PLC group all is connected with described supervisory control comuter by heterogeneous networks independently, all is equipped with an ethernet module on each PLC.
3. network redundancy communication means according to claim 1, is characterized in that, the method also comprises:
Each PLC in described network redundancy PLC group is according to the current main PLC ident value that the negotiation result renewal is stored separately each other, and described current main PLC ident value points to the main PLC in this network redundancy PLC group;
Main PLC in described network redundancy PLC group, according to the preset PLC update cycle, changes this PLC ident value of this main PLC storage.
4. network redundancy communication means according to claim 1, is characterized in that, the method also comprises:
When system initialization, monitoring period is set, indicates described supervisory control comuter to determine once main PLC in each monitoring period.
5. a network redundancy communicator, is characterized in that, comprising:
The PLC driver module, for from network redundancy PLC group, determining current main PLC, described PLC driver module comprises:
Whether the Network Check unit, be communicated with for checking network corresponding to described each PLC of network redundancy PLC group; When the network that each PLC is corresponding is not communicated with, send fault warning,
Information acquisition unit, for reading the job information of the PLC that map network is communicated with, described job information comprises current main PLC sign and this PLC sign,
Comparing unit, when all consistent for the value of the current main PLC sign of the PLC that is communicated with at described map network, determine that the PLC that described current main PLC ident value points to is main PLC; When the value of the current main PLC sign of the PLC be communicated with at described map network is inconsistent, the PLC that described the PLC ident value of take changes is main PLC;
Communication module, for communicating with the definite PLC of described PLC driver module.
6. a network redundancy communication system, it is characterized in that, comprise the network redundancy PLC group under network redundancy communicator claimed in claim 5 and the control of this network redundancy communicator, described network redundancy PLC group comprises at least two PLC, and in described at least two PLC, a main PLC is arranged.
7. network redundancy communication system according to claim 6, is characterized in that, each PLC in described network redundancy PLC group all is connected with described network redundancy communicator by heterogeneous networks independently, is equipped with an ethernet module on each PLC.
8. network redundancy communication system according to claim 6, is characterized in that, current main PLC sign and this PLC sign of each PLC in described network redundancy PLC group for upgrading this PLC storage is specially:
Each PLC in described network redundancy PLC group, for the current main PLC ident value according to the negotiation result renewal is stored separately each other, described current main PLC ident value points to the main PLC in this network redundancy PLC group;
Main PLC in described network redundancy PLC group, also for the PLC update cycle according to preset, change this PLC ident value of this main PLC storage.
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CN104793601B (en) * 2015-04-23 2017-06-13 山东创恒科技发展有限公司 A kind of DCS controllers redundant apparatus and method
CN108540362A (en) * 2018-03-14 2018-09-14 兰州交通大学 A kind of digital communication system and its method based on VR

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