CN101741819A - Protocol conversion gateway - Google Patents
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- CN101741819A CN101741819A CN200810203163A CN200810203163A CN101741819A CN 101741819 A CN101741819 A CN 101741819A CN 200810203163 A CN200810203163 A CN 200810203163A CN 200810203163 A CN200810203163 A CN 200810203163A CN 101741819 A CN101741819 A CN 101741819A
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Abstract
The invention provides a protocol conversion gateway which analyzes the problems existing in the development of an industrial control network protocol and a TCP/IP protocol by analyzing an industrial control network and Ethernet, researches the problems involved in the protocol conversion, provides an industrial control network protocol-IPv6 conversion mechanism and successfully realizes data exchange between the industrial control network and the Ethernet.
Description
Technical field
The present invention relates to industrial control field, specifically, relate to the gateway of industrial control network agreement and IPv6 procotol conversion.
Background technology
In large enterprise's automated system, what upper strata enterprise management level and production monitoring layer generally adopted all is Ethernet and PC at present, and all is employing fieldbus and microcomputer monitoring equipment at scene, lower floor workshop.Network architecture and agreement that two-layer up and down employing is different, in order to realize linking up, usual way is to adopt to add the ether network interface card with Industrial Control Computer, the interface card and the parallel printer EPP interface card of adding on the PC slot are realized.But this connected mode cost height, the construction cycle is long.
The all types of industries control protocol all is based on the ISO/OSI open systems interconnection model, it is seven layers that OSI Reference Model is divided into, Industry Control protocol communication agreement is then simplified according to own characteristic, adopted physical layer, data link layer and network, considered that simultaneously the controlled function of field device and concrete utilization have increased application layer again.On each layer of Industry Control agreement, generally all done following definition:
1) physical layer has defined quantity that signal on the network channel and connected mode, transmission medium, transmission rate, every circuit be connected instrument, maximum transmission distance, power supply etc.When being in the data transmit status, this layer accepted the data that data link layer issues, and will encode and send with certain electric signal, when being in the data receive status, corresponding electric signal is encoded to binary number, and delivers to link layer.
2) data link layer defined a series of functions of serving application layer and downwards with the interfaces of physical layer, the service of use physical layer provides the error check of medium accesses controlled function, message transmission.DLL provides source language service to speak with dependent event, with the source and serves relevant parameter format, and the dependency relation between these services and the incident.DLL provides reliable and transparent data delivery service for the user.Data link layer is the core of fieldbus.All application processes that are connected on the same physical channel in fact all are to coordinate by the real-time management of link layer.For outstanding real-time, fieldbus does not adopt in the past defined distributed physical channel management in IEEE 802.4 standards, but has adopted the centralized management mode.In this manner, the physical channel is effectively utilized, and can reduce or avoid the delay of real time communication effectively.
3) network layer has simplification or realizes the communication between the application process in the dcs for the user provides a series of service, and the operation standard of application interface is provided for the distributed field bus control system simultaneously, has realized the opening of system.Network layer with the network management mechanism of other layers to network data flow, the network equipment and network service manage.
4) application layer is that special control at industrial automation field field device designs with concrete the application, it has defined the uniform rules of mutual access between the field equipment data storehouse, user standard functional block can form system, realize application program of user, this is to make standard for Fieldbus surpass a communication standard and the key that becomes system's standard, also is to make the open key with interoperability manipulation of field bus control system.
From the definition of each layer of field bus protocol, except application layer is to be different from the general procotol, the service of all the other each layer definition all is similarly, has just done special definition at the characteristics of industry spot.General heterogeneous network protocol can be changed by protocol converter through facts have proved, as a kind of special Control Network, heterogeneous network also necessarily can be changed by protocol converter.
Gateway should be realized the conversion between the different network protocol, specific implementation technical with it the agreement of interconnected two concrete networks relevant.Support that the gateway of changing between the different network protocol is inequality.Because the definition of foreign peoples's field bus protocol on physical layer, data link layer, network layer and application layer all is different basically, therefore should adopt the mode of protocol gateway at the protocol converter of fieldbus, realize protocol conversion on the upper strata of agreement.
Summary of the invention
Purpose of the present invention just provides a kind of protocol conversion gateway, and the resource that it can be integrated in the various heterogeneous systems makes its co-ordination, realizes the conversion of industrial control network agreement and IPv6.Technical scheme of the present invention is as described below.
A kind of protocol conversion gateway, it comprises following assembly:
Protocol conversion module realizes that agreement A is mapped to the process of agreement B;
The IPv6 protocol stack module receives that packet from Ethernet is sent to described protocol conversion module or packet that described protocol conversion module is sent is sent to Ethernet;
The industrial control network protocol stack module receives that packet from industrial control network is sent to described protocol conversion module or packet that described protocol conversion module is sent is sent to industrial control network.
Wherein, described IPv6 protocol stack module is made up of network layer, data link layer and the physical layer of the transport layer of supporting TCP/IP and udp protocol, support IPv4 and IPv6 dual stack.
Wherein, described industrial control network protocol stack module is made up of network layer, data link layer and the physical layer of supporting industry Control Network agreement.
Wherein, described protocol conversion module carries out the protocol format conversion by the protocol definition table of the protocol conversion middleware of realizing the application layer protocol conversion, the protocol architecture of analyzing data and operational order in the data of emanating out and operating data and to data, and its message management table that meets the definition of objective network application layer protocol is formed; In protocol conversion module, each protocol conversion is sent the protocol conversion application by other modules to the protocol conversion middleware, load different protocol definition tables by the protocol conversion middleware according to different agreements again, with stipulations and the conversion method of obtaining this kind control protocol, and from the related news allocation list of this agreement, obtain processing method to each specific message, at different control messages, adopt different data transfer devices.
The invention provides a kind of protocol conversion gateway, it is by analyzing industrial control network and Ethernet, analyzed the problem that exists in the development of industrial control network agreement and ICP/IP protocol, studied the problem that relates in the protocol conversion key technology of carrying out protocol conversion finally is provided, propose changing the mechanism of industrial control network agreement and IPv6, successfully realized the exchanges data of industrial control network and Ethernet.
Description of drawings
Fig. 1 is the structural representation of protocol conversion gateway in the embodiment of the invention 1;
Fig. 2 is the schematic diagram of protocol conversion gateway intraware in the embodiment of the invention 1;
Fig. 3 is the schematic diagram of IPv6 protocol stack module in the embodiment of the invention 1;
Fig. 4 is the flow chart of protocol conversion in the embodiment of the invention 2;
Fig. 5 is the embodiment of the invention 2 performance data flow graph of delivering letters;
Fig. 6 is the embodiment of the invention 2 concrete data flow figure.
Embodiment
Now according to accompanying drawing, the present invention will be further described.
The present invention has utilized the protocol conversion principle, and protocol conversion is exactly the process that a kind of agreement A is mapped to another kind of agreement B.In the process of protocol conversion, protocol conversion gateway is according to the definition of procotol A, analyze the content of this protocol data bag, comprise transmission control section and data division in the packet, information analysis according to data division goes out the specific meanings that data comprise again, by the data map definition list, data transaction in the agreement A packet is become agreement B data content that network is supported, then data encapsulation is gone into the packet of network enabled agreement B, and be sent to the network equipment of appointment by agreement B network.In the process of protocol conversion, the conversion of agreement is mainly carried out in network layer and application layer.
In the concrete transfer process at industrial control network specialized protocol and IPv6 agreement, the transfer process of whole agreement is carried out on the upper strata of industrial control network agreement and IPv6 agreement.With the Ipv6 protocol translation is that the Industry Control agreement is an example, at the Ethernet data analysis part, elder generation is according to the definition of IPv6 data packet format, packet is analyzed, extract out wherein data division, the data division that comprises true control information is analyzed, this analyzes the data definition based on the application layer of industrial control network agreement again.By protocal analysis to described application layer data, then the control command and the control data that comprise in the data can be analyzed out, on this basis control command and control data are encapsulated in the packet of Industry Control protocol network application layer, the data packet format with the Industry Control agreement is transferred on the equipment of Industry Control protocol network at last.For process from the data transaction of Industry Control agreement to IPv6, be exactly the inverse process of said process, carry out the analysis and the conversion of data by identical analysis mode in network layer and application layer, re-send on the network equipment in the Ethernet.
Below in conjunction with above-mentioned principle, the protocol conversion gateway among the present invention is described, see also Figure 1 and Figure 2.A kind of protocol conversion gateway, it comprises following assembly: protocol conversion module 1, realize that agreement A is mapped to the process of agreement B; IPv6 protocol stack module 3 receives that packet from Ethernet is sent to described protocol conversion module 1 or packet that described protocol conversion module 1 is sent is sent to Ethernet; Industrial control network protocol stack module 2 receives that packet from industrial control network is sent to described protocol conversion module 1 or packet that described protocol conversion module 1 is sent is sent to industrial control network.
Wherein, described IPv6 protocol stack module 3 is made up of network layer 5, data link layer 6 and the physical layer 7 of the transport layer 4 of supporting TCP/IP and udp protocol, support IPv4 and IPv6 dual stack.Described industrial control network protocol stack module 2 is made up of network layer 8, data link layer 9 and the physical layer 10 of supporting industry Control Network agreement.Described protocol conversion module 1 carries out the protocol format conversion by the protocol definition table 12 of the protocol conversion middleware 11 of realizing the application layer protocol conversion, the protocol architecture of analyzing data and operational order in the data of emanating out and operating data and to data, and its message management table 13 that meets the definition of objective network application layer protocol is formed.In protocol conversion module 1, each protocol conversion is sent the protocol conversion application by other modules to protocol conversion middleware 11, load different protocol definition tables 12 by protocol conversion middleware 11 according to different agreements again, with stipulations and the conversion method of obtaining this kind control protocol, and from the related news admin table 13 of this agreement, obtain processing method to each specific message, at different control messages, adopt different data transfer devices.
The physical layer 10 of industrial control network protocol stack module 2 and data link layer 9 provide the visit of industrial control network and satisfy the needs of various communication medias in the described protocol conversion gateway.On-the-spot industrial instrument or equipment will be when computer send data or order, it at first sends to data the network adapter of supporting industry control specialized protocol in the protocol conversion gateway, realizes the data processing of physical layer 10, data link layer 9 on network adapter.If the CPU on the protocol conversion gateway is handling other incident and its priority height at this moment, just data are put on the buffer memory of network adapter; After handling this incident, just from the highest fieldbus adapter of queuing priority, the data of waiting for are taken out CPU, through sending to the control corresponding computer through Ethernet after data parsing and the ICP/IP protocol encapsulation.Conversely, when controlling computer to field instrument, when equipment sends information, it at first issues protocol conversion gateway based on Ethernet and ICP/IP protocol with information, by protocol conversion gateway data are delivered in the corresponding fieldbus transmitting element then, corresponding industrial instrument or equipment are issued in order or data by network adapter.
Protocol conversion gateway adopts ICP/IP protocol and host computer 14 to communicate.Here need explanation, IPv6 agreement and IPv4 agreement are compared, it has thoroughly solved address space and has exhausted and problems such as routing table explosion, and injected new content for the IP agreement, make and support safety, main frame moves and multimedia becomes the organic component of IP agreement, it is easier that the design of IPv6 agreement makes router handle message, and dilatancy is also better.Though it has been historical certainty that 1Pv6 replaces IPv4, IPv4 can not disappear at short notice, how to realize that therefore IPv4 is to need the urgent problem that solves to seamlessly transitting of IPv6.Therefore, in protocol conversion gateway system, adopt the dual stack model to solve IPv4 and IPv6 are supported that the structure of the protocol stack of IPv4/IPv6 dual stack as shown in Figure 3.IPv6 and IPv4 are the close network layer protocols of function, and the both is based on identical physical platform, and load thereon transport layer protocol TCP and UDP again without any difference.If a main frame is supported IPv4 and two kinds of agreements of IPv6 simultaneously, so this main frame can with the main-machine communication of supporting the IPv4 agreement, again can with the main-machine communication of supporting the IPv6 agreement, the advantage of dual stack technology that Here it is.
The TCP/IP packet of coming from host computer 14 is after arriving protocol conversion gateway, protocol conversion gateway is analyzed the header packet information of packet earlier, thereby judge that this packet is IPv4 or IPv6, after the agreement of packet is judged, packet is submitted to the processing module of corresponding agreement and carried out data processing.Processing module emanates out with the control data in the packet, submits to protocol conversion module 1 and handles.
1 elder generation of protocol conversion module classifies to data according to the source of data, and slave computer 15 state informations of coming for the control command message and slave computer 15 biographies of host computer 14 adopt different processing modes.Pass the data of coming for host computer 14, analyze the content of host computer 14 data earlier according to message management table 13, extracting data operational order and operating data from analyzing again, according to the definite data manipulation mode to slave computer 15 of operational order, the operating data that host computer 14 is transmitted is applied on the slave computer 15.If to the setting operation of slave computer 15, then earlier the slave computer 15 that will operate is carried out address location, the data transaction that then host computer 14 will be set becomes to follow the data format of slave computer 15 industrial control network agreements, will be implemented on corresponding slave computer 15 equipment by setting data according to operational order again; If the order that host computer 14 sends is the information that will inquire about slave computer 15, then from operating data, analyze slave computer 15 addresses that to operate, then according to the protocol definition table, convert operating data to the corresponding discernible packet of Control Network agreement, the network adapter by Industry Control specialized protocol net sends to slave computer 15 via Industry Control protocol-specific network.
The data that send for slave computer 15, network layer 8 by Industry Control specialized protocol net analyzes the transmission data, analyze the data of slave computer 15 again by transport layer 4, at protocol conversion module 1 slave computer 15 data that slave computer 15 transmits are carried out format analysis, with analyzing the data encapsulation of coming out is the packet of Transmission Control Protocol, the destination address of judging this packet again is on IPv4 or IPv6 network, is that the packet of corresponding agreement is sent to host computer 14 by Ethernet with data encapsulation.
In the basic automation systems of certain factory, the L1 level network of network form of field control is PE-Link, this network is the control dedicated network, network communication protocol is the PE-Link specialized protocol, connection between each PLC and the DCS control station realizes that by PE-Link this network belongs to fieldbus level Equipment Control net.The L2 level network of management level, that promptly process machine network of network form adopts is Ethernet 10Base-5/T, network communication protocol is TCP/IP.Because latticed form and agreement is different, so the communication between L2 and the L1 must realize by the protocol conversion gateway between PE-Link and the TCP/IP.Fig. 4 is the flow chart of protocol conversion.
On aforementioned industrial control network agreement and IPv6 protocol conversion gateway, according to the analysis to practical application, this protocol conversion gateway major function is:
1) the state variation data function of delivering letters
Be responsible for detecting the state variation of slave computer 15, after detecting the generation state variation, from the state variation admin table, obtain corresponding message content, in slave computer 15 message queues, write message event, and the request message transmission, message is sent to host computer 14.Fig. 5 is the performance data flow graph of delivering letters.
2) data are provided with function
To slave computer 15 data are set by host computer 14, protocol conversion gateway is obtained address information and the corresponding message number of wanting setting data from data management table is set, message number, module No. and work station number by on the message number setting PE-Link network send to slave computer 15 with data by broadcast mode again.Fig. 6 is concrete data flow figure.
3) data query function
Protocol conversion gateway takes out the state that requires number from the message that host computer 14 is received, and take out the address of the data that will read number from the state variation admin table according to this state, according to address reading of data from the PE-Link network, generate message and send to host computer 14 then.
4) anomaly monitoring function
Monitor the situation of communicating by letter between protocol conversion gateway and host computer 14, the slave computer 15, if the communication abnormality of protocol conversion gateway and host computer 14, or communication abnormality between protocol conversion gateway and the slave computer 15 appears, then restart protocol conversion gateway, and with in the daily record of error message write error.This function mainly is the normal operation for the safeguard agreement transfer gateway.
5) log processing function
Operation notes all in the protocol conversion gateway running is all preserved.Three kinds of daily records in protocol conversion gateway system, have been designed: transmission of messages daily record, error log and state variation daily record.All message that transmission of messages log record gateway institute in service receives and sends; The error in operation information that occurs in the error log record gateway running; The change information each time of slave computer 15 states is then write down in the state variation daily record.
Claims (4)
1. protocol conversion gateway, it comprises following assembly:
Protocol conversion module realizes that agreement A is mapped to the process of agreement B;
The IPv6 protocol stack module receives that packet from Ethernet is sent to described protocol conversion module or packet that described protocol conversion module is sent is sent to Ethernet;
The industrial control network protocol stack module receives that packet from industrial control network is sent to described protocol conversion module or packet that described protocol conversion module is sent is sent to industrial control network.
2. protocol conversion gateway as claimed in claim 1 is characterized in that, described IPv6 protocol stack module is made up of network layer, data link layer and the physical layer of the transport layer of supporting TCP/IP and udp protocol, support IPv4 and IPv6 dual stack.
3. protocol conversion gateway as claimed in claim 1 is characterized in that, described industrial control network protocol stack module is made up of network layer, data link layer and the physical layer of supporting industry Control Network agreement.
4. protocol conversion gateway as claimed in claim 1, it is characterized in that, described protocol conversion module carries out the protocol format conversion by the protocol definition table of the protocol conversion middleware of realizing the application layer protocol conversion, the protocol architecture of analyzing data and operational order in the data of emanating out and operating data and to data, and its message management table that meets the definition of objective network application layer protocol is formed; In protocol conversion module, each protocol conversion is sent the protocol conversion application by other modules to the protocol conversion middleware, load different protocol definition tables by the protocol conversion middleware according to different agreements again, with stipulations and the conversion method of obtaining this kind control protocol, and from the related news allocation list of this agreement, obtain processing method to each specific message, at different control messages, adopt different data transfer devices.
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| CN112866429A (en) * | 2021-01-18 | 2021-05-28 | 北方工业大学 | Multi-protocol industrial Internet of things fusion gateway and communication method thereof |
| CN112866429B (en) * | 2021-01-18 | 2023-06-30 | 北方工业大学 | Multi-protocol industrial Internet of things fusion gateway and communication method thereof |
| CN112929367A (en) * | 2021-02-05 | 2021-06-08 | 重庆邮电大学 | Protocol conversion method for Profinet network and industrial IPv6 backbone network |
| CN112929367B (en) * | 2021-02-05 | 2022-06-03 | 重庆邮电大学 | Protocol conversion method for Profinet network and industrial IPv6 backbone network |
| CN112988876A (en) * | 2021-04-14 | 2021-06-18 | 济南工程职业技术学院 | Industrial data acquisition management method and system |
| CN112988876B (en) * | 2021-04-14 | 2023-04-07 | 济南工程职业技术学院 | Industrial data acquisition management method and system |
| CN114301995A (en) * | 2021-12-30 | 2022-04-08 | 上海交通大学 | Conversion switching and intercommunication fusion system and method of real-time industrial Ethernet protocol |
| CN114338274A (en) * | 2021-12-30 | 2022-04-12 | 上海交通大学 | Heterogeneous industrial field bus fusion method and system |
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Application publication date: 20100616 |