CN202711029U - Wired and wireless hot standby redundancy communication on-site network node module - Google Patents
Wired and wireless hot standby redundancy communication on-site network node module Download PDFInfo
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- CN202711029U CN202711029U CN2012203406371U CN201220340637U CN202711029U CN 202711029 U CN202711029 U CN 202711029U CN 2012203406371 U CN2012203406371 U CN 2012203406371U CN 201220340637 U CN201220340637 U CN 201220340637U CN 202711029 U CN202711029 U CN 202711029U
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Abstract
The utility model discloses a wired and wireless hot standby redundancy communication on-site network node module, comprising a network node module possessing a microcontroller, and an analog quantity input interface, an analog quantity output interface, a switching value input interface and a switching value output interface connected with an on-site sensor and an actuator directly. An analog-digital conversion unit is arranged between the analog quantity input interface and the microcontroller, a digital-analog conversion unit is arranged between the analog quantity output interface and the microcontroller, and an isolation unit is arranged between the switching value input interface, the switching value output interface and the microcontroller. Meanwhile, the wired and wireless hot standby redundancy communication on-site network node module also comprises a memorizer, a power supply unit, and a wireless communication unit and a wired communication unit for sending the result data processed by the microprocessor to an on-site measurement and control network. The redundancy network node module of the utility model can be connected with an instrument or an on-site actuator directly, obtains the state of the instrument or controls an on-site device to thereby construct a measurement and control system of the on-site dual-network redundancy communication.
Description
Technical field
The utility model belongs to network service, especially industry spot measurement and control network technical field.
Background technology
1) fieldbus and multi-master thereof
In industrial application, field bus control system FCS is ripe, replaces gradually original collective and distributive type control system DCS.FCS has and installs simply, and digitized degree is high, has fault diagnosis and by advantages such as default value protection operations.Can for the user saves cost, improve the wisdom level of the gentle system of Automated water.
The mode of operation of fieldbus is divided into master slave mode and many holotypes.Only have a main frame in the fieldbus networks of master slave mode, other are slave, can not intercom mutually between the slave, and slave only and main-machine communication.And under many holotypes, the arbitrary network node in the fieldbus can become that other nodes communicate in main frame and the network.
Because fieldbus adopts bus type structure more, and daisy chain type commonly used connection, so, if one of them node breaks away from from bus links, will produce node communication fault or disconnection fault, cause larger the regretting of communication reliability risk.So some fieldbus adopt ring network structure, a node off-line, ring-network topology becomes bus topology, and main frame can continue the node communication with non-off-line, redundant looped network technology that Here it is.But use this Technology Need looped network administration module, increased equipment cost; And to join end to end, increase installation cost.
2) wireless communication technology
Wireless communication technology and radio network technique since its movability good, need not to connect up, the advantage such as low in energy consumption, self-adaptation networking obtains the extensive concern of industry member, and moves to maturity gradually.Use from original more wireless sensor network, begun to be applied to till now control field.As the improvement pid algorithm of wireless industrial module and radio fest and control network having occurred being applicable to.The wireless module of Ai Mosheng process management robotization department development successfully uses in industries such as chemical industry, cement.The multi-hop technology that adopts cordless communication network improves reliability and the environmental suitability of communication more.Much also adopt the Mesh network schemer to carry out the multirouting reliable communication.The more wireless communication technology of use has GPRS communication at present, WiFi communicates by letter and other are such as wireless LAN communication technology such as ZigBee.
But still there is certain gap in the wireless communication technology that generally speaking, is applied at present industry at the aspect such as traffic rate, security, antijamming capability and wire communication.In large-scale especially infant industry network, mostly or preferentially adopt cable network, when distant, adopt optical fiber as communication media.Wireless network then the Chang Zuowei wire communication a spare communication network and exist.
In wide area network, a kind of double-network redundant scheme of wired and wireless mutual backup is arranged.Main Function is when a kind of network breaks down, and router automatically switches to another kind of network, thereby reaches the effect of the stability that improves communication.Such as the F4X33 series of products of MOXA, its application architecture as shown in Figure 1:
The F4X33 series of products can be supported the cable network of mobile radio network, common PPPOE mode or static IP access way, and support automatic redundant backup function.
The characteristics of this scheme are:
1) belonging to wide area network uses.
2) there is router to manage, namely has special Redundancy Management equipment.
3) operation cost is higher.If adopting this scheme is monitoring platform of industrial station system constructing, then each node in the station needs the SIM card of an IP or a mobile communication, otherwise just need many instrument signals are connected on the equipment, again this equipment is connected into network.Like this, put the equipment room that is connected into network from field instrument and still need wiring and installation.Support that so, then the equipment of redundancy communication is not the communication module of field level just.
In sum, the shortcoming of prior art can be summarized as:
1) mostly range of application is the wide area network application, is not suitable for the measurement and control network of field level
2) be applied in the industry spot measurement and control network, then operation cost is too high
3) Redundancy Management of communication need to have special module, does not have directly to connect with the instrument point of being connected
4) this redundant network still can not be avoided the loaded down with trivial details problems such as wiring installation at observing and controlling scene.
The utility model content
In view of the above shortcoming of prior art, the purpose of this utility model is, a kind of wired and wireless hot backup redundancy field network node module of communicating by letter is provided, and is used for building the low-cost redundant measurement and control network of field level, and makes it to have advantages of easy for installation.
The purpose of this utility model is to realize by following means.
A kind of wired and wireless hot backup redundancy field network node module of communicating by letter comprises: the network node module has microcontroller and is connected analog input interface, analog output interface circuit and switch value input interface, the switching value output interface that connects spot sensor and actuator; Has AD conversion unit between analog input interface and the microcontroller; Has D/A conversion unit between analog output interface circuit and the microcontroller; Has isolated location between switch value input interface and switching value output interface and the microcontroller; The wireless communication unit and the wire communication unit that also have simultaneously storer and power supply unit and the result data of microprocessor processes is sent into the field level measurement and control network.
Adopt means as above, the zero cost communication operation that the utility model can be advantageously used in building the low-cost redundant measurement and control network of field level and realize the observing and controlling scene, do not need special Redundancy Management System, measuring and controlling node self on each on-the-spot instrument point just has the Redundancy Management algorithm, just realize simply arranging net at the scene of the industry measurement and control system bottom, save the Installation and Debugging cost.
Description of drawings:
Fig. 1 is the conceptual scheme of the double-network redundant of wired in the prior art wide area network and wireless mutual backup.
Fig. 2 is the schematic diagram of the field level measurement and control network of multi-host communication pattern.
Fig. 3 a, Fig. 3 b are the gateway module workflow diagram of multi-host communication pattern: Fig. 3 a is the total flowchart of gateway module;
Fig. 3 b is that gateway module carries out the workflow diagram that normal tasks is communicated by letter with node module.
Fig. 4 is the network node module workflow diagram of multi-host communication pattern.
Fig. 5 is the structural representation of the utility model network node module.
Fig. 6 is the network node module realization figure that the utility model CAN bus is made the wire communication mode.
Fig. 7 is the external relations figure of the network node module after the utility model embodiment encapsulation.
Embodiment
Below in conjunction with accompanying drawing and implementation the utility model is further described.
In the field level measurement and control network of as shown in Figure 2 employing multi-host communication pattern, gateway module obtains the state of monitoring target by the node module in the network, perhaps by the corresponding controlled device of network node module controls.Gateway adopts Fig. 3 workflow, and network node adopts Fig. 4 to describe wired and wireless hot standby method workflow of communicating by letter, and realizes the how main redundancy communication of field level zero cost.
1) fault detect location and communication handover method:
Under the wire communication mode, when sending inquiry/steering order, certain node module without answer, when perhaps the reply content form is incorrect, resends inquiry/steering order to another node module; When repeating to send instruction, limited number of time all can not get the answer of correct format or basic when replying, this node module then sends the diagnosis frame to the left neighbor and right neighbor module of destination node respectively, according to the answer situation to the diagnosis frame, fault is judged and located, specific as follows:
A) when the left neighbor and right neighbor module of destination node all when replying, this node module is thought self to go offline or fault is arranged, light the malfunction indicator lamp of self, and switch to wireless mode and communicate with the destination node of wanting to communicate by letter, finish this inquiry/control task; While wireless mode and gateway communication, inform that gateway self has fault, gateway just deposit within it with external storage in the mapping space setting " node failure sign " of this node address, the record trouble time, form the failure logging of this node module, and report and submit to superior system or man-machine interface.
B) the left neighbor and right neighbor module when destination node all has answer, and replys when correct, thinks that the destination node module has fault or destination node module to go offline from bus.The node module of initiating communication switches to communication and destination node module communication, finishes communication task.Send simultaneously " report frame " to gateway module, Objective of Report node module has fault, gateway just deposit within it with external storage in the mapping space setting " node failure sign " of this node address, the record trouble time, form the failure logging of this node module, and report and submit to superior system or man-machine interface.
C) when correct answer of the left neighbors of destination node and right adjacent module without replying or reply when incorrect, think the node of initiating communication on the left side of destination node module, disconnection fault occurs in destination node between its right neighbors.Then the node module of initiating communication switches to communication and destination node module communication, finishes communication task.Send simultaneously " report frame " to gateway module, report disconnection fault point position, gateway just deposit within it with external storage in mapping space setting " disconnection fault sign " corresponding to bus line numbered address, the record trouble time, form the failure logging of this section circuit, and report and submit to superior system or man-machine interface.
D) when correct answer of the right neighbors of destination node and left adjacent module without replying or reply when incorrect, think the node of initiating communication on the right of destination node module, disconnection fault occurs in destination node between its left neighbors.Then the node module of initiating communication switches to communication and destination node module communication, finishes communication task.Send simultaneously " report frame " to gateway module, report disconnection fault point position, gateway just deposit within it with external storage in mapping space setting " disconnection fault sign " corresponding to bus line numbered address, the record trouble time, form the failure logging of this section circuit, and report and submit to superior system or man-machine interface.
After gateway module receives the report of circuit disconnection fault between node module fault and node, can send " broadcast frame " by communication to the whole network, all nodes on the network are informed in fault type and position, so that the communication mode of the knot adjustment on the network and trouble spot correlation module.
After network node receives this " broadcast frame ", analysis of failure type and position, and the later communication of assurance that takes appropriate measures.Specific as follows:
A) node is gone offline or node self wire communication out of order, deposit within it with the corresponding failure node corresponding address space of external storage and add " node failure record ", all carry out with wireless mode with communicating by letter of this malfunctioning node thereafter.
B) disconnection fault is appearred in circuit section between node, deposit within it with the respective lines fault section corresponding address space of external storage and add " disconnection fault record ", if certainly in the left side of trouble spot, then the node on the right of this trouble spot all communicates with wireless mode thereafter; If from the right of trouble spot, then all communicate with wireless mode with the node on this left side, trouble spot thereafter.
2) method of recovery wire communication:
A) recover the method for wire communication after node failure is got rid of
Node module with wire communication fault continues to monitor " the fault eliminating zone bit " of oneself, when monitoring fault and got rid of, then switch to the wire communication mode, and send " the report frame " that can re-start wire communication and give gateway module, after gateway is received this report, slave addresses mapping space in internal memory and storer adds " node failure is got rid of record ", and sends " broadcast frame " to whole network nodes.Thereafter this node module just returns to the wire communication pattern.
B) recover the method for wire communication after disconnection fault is got rid of
After the track section disconnection fault is got rid of, with this section join about corresponding " disconnection fault eliminating button " on two network nodes pressed by manual, two nodes just send accordingly " disconnection fault eliminating signal " to gateway module.After gateway module receives that the disconnection fault of two nodes is got rid of signal, " disconnection fault eliminating zone bit " set with the respective section mapping address place in own internal memory and the storer, gateway sends " broadcast frame " notice overall network node simultaneously, and network recovery is to the wire communication state.
3) the network node module of redundancy communication
One has the wired and network node module redundant wireless communication capacity and can adopt multiple embedded platform, as adopt ARM, DSP, MSP430 or 51 single-chip microcomputers etc. as microcontroller, be equipped with again peripheral I/O and Processing Interface thereof and communication interface, just can set up an above-mentioned network node module.
Certain industrial field bus is taked in wire communication unit wherein, such as CAN bus, PROFIBUS bus etc.Wireless communication unit can adopt ZigBee technology, nRF wireless communication technology etc.The structure of whole network node module can be illustrated with Fig. 5.
The network node module directly connects spot sensor and actuator.The analog signals of sensor and switching value signal analog input interface, the switch value input interface access network nodes module by slave processed through the microcontroller that AD conversion unit and isolated location enter the network node module respectively.Result data after the processing is sent into on-the-spot other network nodes or gateway module through wireless, wired redundancy communication mode.Same, the microcontroller of network node module need to be exported analog quantity and switching value when controlling on-the-spot actuator, then will pass through respectively D/A conversion unit and isolated location, the actuator of then reaching the spot, and the control actuator moves.The power supply of whole network node module is provided by power supply unit, needs the storer by the network node module of data storage to be responsible for.
Wherein do communication with ZigBee, the network node module of doing the wire communication mode with the CAN bus realizes such as Fig. 6.
Whole network node module adopts the 24VDC power supply, and reason is that on-the-spot instrument or actuator generally adopt the 24VDC power supply mode, such as pressure, temperature transmitter and solenoid valve etc.Simultaneously, the pattern that adopts outer power supply and powered battery to back up mutually when outer power supply goes offline or other situations can not power the time, is enabled battery-powered.24VDC is through becoming 3.3VDC to microcontroller STM32ARM chip power supply behind the voltage regulation of voltage regulation, and realize ADC (analog to digital conversion), DAC (digital-to-analog conversion) and with the serial communication (USART) of ZigBee communication module.
The ADC module that on-the-spot analog signals enters the ARM chip after changing through I/V (current/voltage), the voltage signal of the DAC module output of ARM chip outputs to the on-the-spot analog quantity actuators such as flow regulating valve with standard industry analog quantity 4 ~ 20mA after changing through V/I.On-the-spot switching value signal is through the laggard GPIO mouth that enters the master control chip of light-coupled isolation, in like manner, switching value output also through output after the isolation such as relay with switch actuator such as control solenoid valves.
The network node module communicates by CAN interface and transceiver and cable network CAN bus, by ZigBee module and wireless network swap data.The data communication device of ZigBee communication module crosses the USART interface and microcontroller ARM chip carries out serial communication.External relations such as the Fig. 7 of network node module after the encapsulation.
The beneficial effect that technical solutions of the utility model are brought can be summarized as follows:
1) the redundant network node module can directly be connected with instrument or on-the-spot actuator, obtains state or the control field apparatus of instrument.Simultaneously its wired and wireless communication unit can adopt above-mentioned algorithm to realize redundancy communication, and is like this then can make up the TT﹠C system of the dual network redundancy multi-host communication of a field level.Improved the reliability of industry spot monitoring with control system.
What 2) communication between this network node module and the main frame was adopted is industrial bus and wireless local area network technology, after the disposable hardware investment, do not need in the operation process to pay any communication cost, so be the reliable site measuring and control network of a zero cost communication operation.
3) the above-mentioned redundancy communication management algorithm of network node module operation, the characteristics of the redundant multi-host communication of realization dual network.So do not need extra Redundancy Management equipment, saved cost, simplified redundancy communication network structure.
4) it is reliable industrial field bus that the wire communication in the site measuring and control network that makes up is adopted, employing be bus type structure, generally can slave be linked to each other successively according to nearby principle with the daisy chain connected mode, be connected on the gateway module at last.So whole system just only has a physical connection cable just can realize the reliable multi-host communication of dual network redundancy.Therefore the installation of system is simple especially, quick, so installation cost is low, the cycle is short.
Communication mode on the network node module is not necessarily CAN bus and ZigBee also, also may be other buses or wireless network.
The selectable assembly that these and routine techniques consist of all is the utility model basic scheme imbody in force.
Claims (3)
1. wired and wireless hot backup redundancy field network node module of communicating by letter, it is characterized in that, comprising: the network node module has microcontroller and is connected analog input interface, analog output interface circuit and switch value input interface, the switching value output interface that connects spot sensor and actuator; Has AD conversion unit between analog input interface and the microcontroller; Has D/A conversion unit between analog output interface circuit and the microcontroller; Has isolated location between switch value input interface and switching value output interface and the microcontroller; The wireless communication unit and the wire communication unit that also have simultaneously storer and power supply unit and the result data of microprocessor processes is sent into the field level measurement and control network.
2. the described wired and wireless hot backup redundancy of the realization field network node module of communicating by letter according to claim 1 is characterized in that, described wireless communication unit can adopt ZigBee, nRF device.
3. the described wired and wireless hot backup redundancy of the realization field network node module of communicating by letter according to claim 1 is characterized in that, described microcontroller can adopt one of ARM, DSP, MSP430 or 51 single-chip microcomputers.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112968733A (en) * | 2021-02-03 | 2021-06-15 | 深圳市融创飞宇通讯有限公司 | Intelligent integrated redundant network device integrating ONU (optical network unit) and 5G (third generation) modules |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112968733A (en) * | 2021-02-03 | 2021-06-15 | 深圳市融创飞宇通讯有限公司 | Intelligent integrated redundant network device integrating ONU (optical network unit) and 5G (third generation) modules |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20150713 |
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| EXPY | Termination of patent right or utility model |