CN102347879A - D-BUS high-speed bus technology based on ring type Ethernet and auxiliary network - Google Patents
D-BUS high-speed bus technology based on ring type Ethernet and auxiliary network Download PDFInfo
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Abstract
The invention provides a D-BUS high-speed bus technology based on a ring type Ethernet and an auxiliary network, which belongs to the technical field of industrial control. The D-BUS high-speed bus technology is characterized in that a D-BUS (Dual-BUS) high-speed bus network consists of a high-speed ring type Ethernet ReBUS and an auxiliary network MB+, wherein the ReBUS bus utilizes the physical layer specification of Ethernet IEEE802.3, a main station is connected with slave stations in series to form a ring type topological structure, the wiring mode for the main station and the slave stations is same with that of the slave stations with the slave stations, a receiving terminal of each equipment is connected with a transmitting terminal of the former equipment, the transmitting terminal of the equipment is connected with a receiving end of a latter terminal, the receiving terminals are sequentially connected with the transmitting terminals in the mode to form a ring type network structure, I/O equipment are connected with the slave stations through RS485 serial ports and serve as the expansion I/O of the slave stations, and failure detection comprising failure diagnosis, failure location and communication redundancy is realized by the MB+ bus. The invention has the beneficial effects that the ring type wiring cost is low, the data exchange of all network nodes is realized by one message, the communication efficiency is high, a failure detection and failure recovery mechanism is provided, and the reliability is high.
Description
Technical field
The invention belongs to the industrial control technology field, relate to of the requirement of this field, specially refer to a kind of D-BUS high-speed bus technology based on ring-like Ethernet and auxiliary network to the real-time and the reliability of transfer of data.
Background technology
Current industrial field ethernet communication standard commonly used has: the EPA of EtherNet/IP, Modbus/TCP, FF_HSE, ProfiNet and China's independent development etc.Each standard has different features at aspects such as procotol, traffic rate, transmission range, website quantity, functional safeties.The use switch that above-mentioned bus network has carries out network and connects, and the employing ring network that also has connects.Ring network connects problems such as the exchange time-delay of having avoided exchanging form and the complicacy that connects up.
The medium redundancy protocol) and DRP agreement (Distributed Redundancy Protocol: distributed redundancy protocol) MRP agreement (the Media Redundancy Protocol: of ring type structure is adopted in the Industrial Ethernet fault detect usually.MRP is comparatively common in the ProfiNet system, and it adopts master-slave mode to carry out fault-finding and fault recovery; DRP is comparatively common in the EPA system, and it adopts, and each station owner of distribution mode is moving to carry out fault-finding and fault recovery.They differ from one another at aspects such as detection mode, reset mode, switch configuration, but its detected object all is a switch, and the two network interface cards of configuration carry out the terminal equipment link.There are problems such as equipment cost is high, wiring complicacy.
Ethernet fault detection method commonly used has: consult automatically to detect, OAM (Operation Administration Maintenance: operation management maintain) detect with BFD (Bidirectional Forwarding Detection: two-way forwarding detects) detection etc.Automatically consult to detect to utilize the Ethernet Automatic Negotiation Mechanism, be used to check circuit question, but require the working method of master-slave equipment necessary consistent; It is the detection line problem that OAM detects the monitoring that is mainly used in node, link; BFD detects the quick fault testing mechanism that general, standardized a, media independent, protocol-independent are provided, and mainly network linking ability and system communication forwarding capability is detected.They differ from one another at aspects such as testing mechanism, measuring ability, application scenarios, but exist diagnosis mechanism complicated, or function singleness, maybe can't realize problems such as fault location and communication redundancy.
Summary of the invention
The object of the invention provides a kind of D-BUS (Dual-BUS) high-speed bus network, and this network is made up of ring-like Ethernet ReBUS of high speed and auxiliary network MB+.Wherein, the ReBUS bus is applied to real-time data communication; The MB+ bus then is applied to failure diagnosis, fault location and subsidiary communications etc., solves industrial control technology field devices cost height, wiring complicacy, function singleness, maybe can't realize problems such as fault location and communication redundancy.
The ReBUS bus is used IEEE802.3 ethernet physical layer standard and ring topology, and realizes the data communication between main website and the slave station through network communication protocol.Owing to need not switch, wiring is simple, avoids the message collision.Each node communication response time can reach 10us/100Bytes, and industry ethernet at a high speed can be realized the quick response between master-salve station and the expansion IO equipment, satisfies the real-time requirement of industrial control field.
Under the prerequisite that guarantees high speed data transfer, the D-BUS high-speed bus adopts the MB+ bus to realize fault detect in addition, comprises failure diagnosis, fault location and three functions of communication redundancy, and therefore, the present invention is applicable to the industry spot application of high reliability.
D-BUS high-speed bus technology of the present invention comprises three partial contents: network configuration from station administration and fault detect, specifies as follows:
(1) network configuration
The network configuration of D-BUS bus comprises ReBUS bus, MB+ bus, main website, slave station and I/O equipment five parts.Wherein, the ReBUS bus is utilized IEEE802.3 ethernet physical layer standard, and main website is formed ring topology with slave station with the mode of connecting.Main website and slave station; Adopt identical mode of connection between slave station and the slave station; The receiving terminal that is each equipment links to each other with the transmitting terminal of previous equipment, and the transmitting terminal of this equipment links to each other with the receiving terminal of a back equipment, connects to form ring-like ReBUS bus network successively.The MB+ bus is connected to main website and slave station on the same bus through serial ports, and adopts polling mode that each slave station is carried out fault detect.I/O equipment is connected with slave station through the RS485 serial ports, as the expansion I/O of slave station, carries out data communication with main website.
(2) from station administration
Accomplishing through the ReBUS bus from station administration of D-BUS bus comprises communication protocol and system management two aspect contents:
The ReBUS network communication protocol comprises seven aspect contents: frame structure, address sort, addressing system, communication service, message definition format, command definition and Memory Management Unit, realize the data communication between main website and the slave station.
The system management of ReBUS bus comprises three aspects: telecommunication management, message management, data interaction.
(3) fault detect
The ReBUS bus adopts ring topology, and equipment in the bus makes the real time communication message send and interrupts if fault will cause the loop fracture.To the industry spot of high reliability request, adopt the MB+ bus to realize failure diagnosis, fault location and communication redundancy.
fault diagnosis, the main bus station through the MB + send diagnostic messages for troubleshooting, the slave node receives the transmission of diagnostic messages to determine the diagnostic object, if it is processed and made itself directly answer; if its I / O devices are forwarded to the expansion I / O device handling.Main website analyzes response message, if there is fault then to confirm fault type.
fault location, diagnostics to the master fault in determining the type of failure at the same time according to the device address determines the location of faulty equipment and report to the user.
Effect of the present invention and benefit are:
D-BUS network using ring-type wiring, simple, easy wiring, cabling and low cost;
Description of drawings
Fig. 1 is D-BUS bus network figure.
Fig. 2 is a ReBUS bus interface line chart.
Fig. 3 is ReBUS message format figure.
Fig. 4 is a Memory Management Unit configuration block diagram.
Fig. 5 is the logical address sketch map.
Fig. 6 is ReBUS data interactive mode figure.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
(1) network configuration
The execution mode of D-BUS bus network is from the mode of connection and networking mode two aspect explanations.
(1) networking mode
Fig. 1 has described the network configuration of D-BUS bus.Form by ReBUS bus, MB+ bus, main website, slave station and I/O equipment five parts.
(2) mode of connection
Fig. 2 has described the mode of connection of ReBUS bus.The ReBUS bus adopts ring-like connection; Be after wiring finishes master-slave equipment to be connected in the ring type structure of a closure; Wherein if a plurality of equipment are arranged; Comprise main website; The mode of connection between per 3 device A, B, the C is: the transmitting terminal of device A links to each other with the receiving terminal of equipment B, and the transmitting terminal of equipment B links to each other with the receiving terminal of equipment C.Connect to form a ring type structure in this way successively.
The MB+ bus is connected to main website and slave station on the same bus through serial ports, promptly links together with the serial ports receiving terminal of bus mode with all devices, and transmitting terminal links together.Make the MB+ bus can adopt the mode of poll scanning, accomplish fault detect all devices.
Each slave station all will dispose two serial ports, and one connects the MB+ bus, and another connects the I/O equipment of expansion.Also adopt bus mode to be connected between slave station and the expansion I/O equipment, be about to slave station and expansion I/O equipment and be connected on the same bus.
(2) from station administration
Can narrate from following two aspects from the execution mode of station administration:
communication protocols;
system management;
(1) communication protocol
The ReBUS network communication protocol mainly is used for realizing the data communication between main website and the slave station.The execution mode of this communication protocol can be narrated from following seven aspects:
The ethernet frame type that the ReBUS frame structure is corresponding is 0x88A4.Its data do not rely on the physical sequential of each slave station in the network in proper order, addressing arbitrarily.ReBUS adopts direct ethernet frame transmission.Concrete structure is as shown in table 1,
Table 1 ReBUS message format
In ReBUS communication, need carry out addressing through different address between main website and the slave station and communicate by letter, comprise three kinds of addresses altogether, i.e. device address, register address, logical address.Specify as follows:
The device address is divided into location address and node address, and it has identified the some equipment in the group equipment.Wherein, location address is according to the set positions of equipment in looped network; Node address is set according to actual needs.
Register address has a lot of registers comprising IO resource, slave unit information etc. in slave station, register address and ModBus address are similar, have identified certain register.
Logical address is used for locating certain register of certain equipment of group equipment, can have access to any IO resource in the network through it.
Addressing Modes
The ReBUS slave station is supported the different address addressing mode, comprises four kinds of addressing altogether, i.e. logic addressing, equipment addressing specify as follows:
The logic addressing in a section, needs 32 bit address (internal register addresses that comprises 16 slave station device addresses and 16 s' slave station) under the logic addressing system.Under this addressing system, slave station is not each self-routing but district's addressing in the logical address area of a 4GB.Any slave station can use this logical address area.The logic addressing mode is suitable for the transmission of cyclic process data.In the logic addressing, Memory Management Unit is handled the mapping between local register address and the logical address.
The equipment addressing system has location addressing and two kinds of addressing mechanisms of node addressing.
Location addressing, 32 bit address are divided into 16 slave station device address and 16 s' the internal register addresses of slave station in the ReBUS message.Main website removes each slave station of addressing through physical location in the section of slave station.When each slave station of message process, 16 device address domain in the frame are added 1 from standing-meeting.
The node addressing, at start-up period, through location addressing, main website gives each slave station configuration a node address, is called the node addressing with the mode of this addressing of address slave station.When network topology changed perhaps equipment increase or deletion, this mechanism guaranteed that main website can be addressed to a certain slave station through identical configuration address.
communication service
The communication service that the ReBUS bus provides comprises: read to serve, write service, read-write service and be used for the expansion service with the expansion I/O devices communicating, embodiment of each service is following:
Through the service of reading, main website can read the register data of one or more slave stations.The ReBUS bus mainly provides four kinds of services of reading, and is as follows.
The service of autoincrement address physical read is served main website through this and can be addressed to slave station according to the physical location from the section of standing in, and reads a certain register data in this station again.
The service of node addressing physical read is served main website through this and can be addressed to slave station according to the node address of slave station, reads a certain register data in this station again.
The logic service of reading is served the register data that main website can read one or more slave station logical address signs through this.
The broadcasting service of reading is served main website through this and can read the register data that all comprise this physical address slave station.
Through writing service, main website can write data in the corresponding registers of one or more slave stations.The ReBUS bus mainly provides four kinds to write service, and is as follows.
Autoincrement address physical write service is served main website through this and can be addressed to slave station according to the physical location from the section of standing in, and data is write in this station in a certain register again.
Node addressing physical write service is served main website through this and can be addressed to slave station according to the node address of slave station, data is write in this station in a certain register again.
Logic is write service, serves main website through this and data can be write in the register of one or more slave station logical address signs.
Service is write in broadcasting, serves main website through this and data can be write in all registers that comprise this physical address slave station.
Through read-write service, the register data of the read-write one or more slave stations of main website.The ReBUS bus mainly provides a kind of read-write service, and is as follows.
Logic read-write service allows the register data of the one or more slave station logical address signs of main website write or read.Slave station can extract data (write operation) from the ReBUS frame, data can be inserted into (read operation) in the same frame simultaneously.
Through expansion service, main website can obtain each slave station with the facility information of I/O equipment.The ReBUS bus mainly provides four kinds of expansion service, and is as follows.
The service of expansion I/O device scan is served main website through this and can be notified slave station to send scanning slave unit message, and its I/O equipment of being with is reached the standard grade.
The expansion I/O device scan inquiry service that finishes is served main website through this and can be addressed to slave station according to the device address of slave station, reads a certain register data in this station again, judges whether slave station accomplishes scanning work.
The service of reading of expansion I/O equipment number is served main website through this and can be addressed to slave station according to the device address of slave station, reads a certain register data in this station, obtains the number of expansion I/O equipment.
The service of reading of expansion I/O device type is served main website through this and can be addressed to slave station according to the device address of slave station, reads a certain register data in this station, obtains the facility informations such as type of expansion I/O equipment.
Fig. 3 has described ReBUS message format and the parameter in the ethernet frame structure.The ReBUS bus apparatus uses the IEEE802.3 ethernet frame structural transmission ReBUS message of standard; And keep 22 byte Ethernet headings; The leading character that comprises 8 bytes, the destination address of 6 bytes, the source address address of 6 bytes and the ethernet frame type of 2 bytes.Length field is represented the ReBUS data field length.CRC is that check field is as shown in table 2.
ReBUS message coding table in the table 2 ethernet frame structure
Many strips message is arranged in the ReBUS data field, and " type of message " field is command function number in this message.The logic initial address of " register address " field for reading and writing data, this value is made up of device address and device interior register address jointly, and is every through a slave station in increasing addressing and broadcast addressing certainly, and " device address " adds 1.Every through a slave station, the unit count value adds 1, and is as shown in table 3.
The sub-message coding table of table 3 ReBUS
In the sub-message of ReBUS, id field has been stipulated sub-message function, wherein a kind of COS of each function correspondence.Logical address in the message and length field have been stipulated the exercisable ranges of logical addresses of sub-message.
13 kinds of orders are provided in the ReBUS agreement, and the definition of each order is following:
From increasing read command, this order is used for the service of autoincrement address physical read, adopts the location addressing mode, reads a certain register data in the slave station.
From increasing write order, this order is used for the service of autoincrement address physical write, adopts the location addressing mode, and data are write in the slave station in a certain register.
Node read command, this order are used for the service of node addressing physical read, adopt the node addressing system, read a certain register data in the slave station.
Node write order, this order are used for node addressing physical write service, adopt the node addressing system, and data are write in the slave station in a certain register.
Broadcasting read command, this order are used for the broadcasting service of reading, and adopt broadcast mode, read the register data that all comprise this register address slave station, and adopt that " register address " field is 0 in the message of this order.
Broadcasting write order, this order are used for broadcasting and write service, adopt broadcast mode, data are write in all registers that comprise this register address slave station, and adopted that " register address " field is 0 in the message of this order.
Logic read command, this order are used for the logic service of reading, and adopt the logic addressing system, read the register data of logical address sign in one or more slave stations.
Logic write order, this order are used for logic and write service, adopt the logic addressing system, data are write in the register of logical address sign in one or more slave stations.
Logic read write command, this order are used for logic read-write service, adopt the logic addressing system, the register data of logical address sign in the one or more slave stations of write or read.Realize accomplishing the exchanges data of all-network node through a message.
Secondary equipment scan command, this order are used for the service of expansion I/O device scan, adopt the equipment addressing system, and the notice slave station sends scanning slave unit message, makes its I/O equipment of being with reach the standard grade.
Secondary equipment been scanned querying command, this order are used for the expansion I/O device scan inquiry service that finishes, and adopt the equipment addressing system, read a certain register data in this station, judge whether slave station accomplishes scanning work.
The read command of secondary equipment number, this order are used for the service of reading of expansion I/O equipment number, adopt the equipment addressing system, read a certain register data in this station, obtain the number of expansion I/O equipment.
The read command of secondary equipment type, this order are used for the service of reading of expansion I/O device type, adopt the equipment addressing system, read a certain register data in this station, obtain the device type, sequence number of expansion I/O equipment etc.
Memory Management Unit provides the mapping function of slave station register address to logical address, and the logical address mapping space of 4GB is provided.
Fig. 4 has described the configuration of Memory Management Unit.Through disposing each Memory Management Unit from station control, just can be any position of the segment register map addresses in the slave station to logical address.When main website writes data to slave station through logical course; Data are put on the Frame respective logical addresses position; When Frame during through the slave station of addressing, from station control obtain corresponding data and through Memory Management Unit data map to corresponding registers; When slave station transmits data to main website, register data is inserted in the corresponding data frame logical address through Memory Management Unit sends to main website.
Fig. 5 has described the logical address mapping relations.In communication process, slave station judges at first whether the ranges of logical addresses (logical address and length field) of appointment in the message comprises the mapping value of self register address, if comprise then carry out read or write according to mapping relations.Simultaneously, it is different register addresss with same logical address according to the action type different mappings that map addresses allows equipment, makes things convenient for read-write operation.
In logical address mapping,, then the register address of storage expansion I/O device resource need be mapped on the corresponding logical address during mapping register address if slave station has connected expansion I/O equipment.Like this, main website can carry out read-write operation to slave station and I/O equipment thereof simultaneously through the real time communication message.
(2) system management
The execution mode of the system management of ReBUS bus can be narrated from following three aspects:
The ReBUS telecommunication management mainly is divided into three phases: device initialize, scanning configuration and real time communication.This three phases needs main website to cooperate realization with slave station.
The device initialize stage mainly operates and comprises: read the slave station number, remove the internal register (device address, Memory Management Unit etc.) of equipment.The scanning configuration phase is mainly operated and is comprised: facility informations such as the device type of scanning slave station and sequence number, configuration slave node address and Memory Management Unit.The logical address mapping realizes that through the configuration store management unit main website confirms each slave station internal register addresses and logical address mapping relations according to communicating requirement, through node address addressing slave station, and the Memory Management Unit of configuration from station control.Through above-mentioned two stages, main website has grasped slave station number and facility information, and each slave station has been assigned with node address and has confirmed the logical address mapping relations.Main website only need periodically send logic read-write message and can realize the read-write operation to slave station in the real time communication stage.
In communication process; If main website need be with the I/O devices communicating with slave station, then need scan expansion I/O equipment, confirm each slave station with the number and the type information of I/O equipment; And config memory administrative unit again, can realize read-write operation to expansion I/O equipment.
The communication message that in ReBUS communication, needs has ten kinds, and is specific as follows:
The slave station number reads message, and this message adopts the broadcasting read command, and command number is 0x07, and message format is with reference to table 3.This message is every, and the device location address adds 1 through a slave station, thereby the device location address value through responding obtains the slave station number.
The slave station internal register is removed message, and this message adopts the broadcasting write order, and command number is 0x08, and message format is with reference to table 3.Main website writes primary data in all registers that comprise this physical address slave station.The slave station internal register is carried out clear operation.
The slave station device type reads message, and this message adopts from increasing read command, and command number is 0x01, and message format is with reference to table 3.Main website is addressed to slave station according to physical location from the section of standing in, reads this station corresponding registers data, obtains the device type, sequence number of slave station etc.
Slave node address configuration message, this message adopts from increasing write order, and command number is 0x02, and message format is with reference to table 3.Main website is addressed to slave station according to the physical location from the section of standing in, and the node address that disposes is written in the corresponding registers at this station, accomplishes the configuration of node address.
Expansion I/O device scan message, this message adopts the secondary equipment scan command, and command number is 0x0E, and message format is with reference to table 3.Slave station receives this command number, sends scanning slave unit message, makes expansion I/O equipment reach the standard grade.
The expansion I/O device scan query message that finishes, this message adopt secondary equipment been scanned querying command, and command number is 0x0F, and message format is with reference to table 3.Main website can periodically send this message, is addressed to slave station according to the device address from the section of standing in, and reads this station corresponding registers data, confirms whether this station accomplishes the scanning work to expansion I/O.If all slave stations are all accomplished this work, main website will stop to send this message.
Expansion I/O equipment number reads message, and this message adopts secondary equipment number reading order, and command number is 0x10, and message format is with reference to table 3.Main website is addressed to slave station according to the device address from the section of standing in, and reads this station corresponding registers data, obtains the number of expansion I/O equipment.
The expansion I/O device type reads message, and this message adopts secondary equipment type reading order, and command number is 0x11, and message format is with reference to table 3.Main website is addressed to slave station according to device address from the section of standing in, reads this station corresponding registers data, obtains the device type, sequence number of expansion I/O equipment etc.
The Memory Management Unit configuration message, this message adopts the node write order, and command number is 0x05, and message format is with reference to table 3.Main website is addressed to slave station according to the node address of slave station, and the logical mappings relation is written in the corresponding registers at this station, accomplishes the configuration of Memory Management Unit.
The real time communication message, this message adopts the logic read write command, and command number is 0x0C, and message format is with reference to table 3.Main website is addressed to slave station according to logical address.Main website carries out the data write operation through the register to logical address sign in one or more slave stations, constantly reads and writes the resource of slave station and I/O equipment thereof.
Attention: have four kinds to be optional message in the above-mentioned message, promptly expansion I/O device scan message, expansion I/O device scan finish, and query message, expansion I/O equipment number read message, the expansion I/O device type reads message.Whether these four messages can be selected to send according to user's needs, if main website need with the expansion I/O devices communicating, then send this four kinds of messages, otherwise do not send.
Fig. 6 has described the mode of ReBUS data interaction.The ReBUS bus adopts the master-slave communication mode.The main website cycle is sent the real time communication message, and slave station copies dateout according to configuration from the message assigned address, and the backfill image data, then message is sent to next node.So circulation when message is got back to the main website receiving terminal, is accomplished the read-write operation of whole slave stations.
Attention: if slave station has I/O equipment, the then data interaction between main website and the slave station comprises the data interaction between main website and the expansion I/O equipment.
(3) fault detect
Equipment in the ReBUS bus makes the real time communication message send and interrupts if fault will cause the loop fracture.To the industry spot of high reliability request, adopt the MB+ bus to realize fault detect.
The MB+ bus provides cyclic polling and fault triggering, and whether the dual mode detection loop breaks down.The cyclic polling mode is meant: main website sends the diagnosis message through the MB+ bus timing to slave station; Can confirm through this message whether slave station breaks down, if break down, and the position of definite fault type and faulty equipment; Under this mode, the MB+ bus will be in running order always.If the fault triggering mode is meant: if the real time communication message response that main website sends is overtime, can still overtime, then start the MB+ bus and carry out fault detect according to configuration retry predetermined number of times; Otherwise, then do not start.The user can select the fault detect mode of MB+ bus as required.No matter under the sort of mode, start the MB+ bus and carry out fault detect, main website all can periodically send the diagnosis message to each slave station, and adopts scan mode to accomplish the fault detect of all-network node.Main website analyzes the message that each slave station is responded, and confirms fault type and faulty equipment, and closes the ReBUS bus automatically and use the MB+ bus to communicate.
The execution mode that the MB+ bus failure detects can be narrated from following three aspects:
fault location;
(1) failure diagnosis
Start the MB+ bus and carry out fault detect, at first carry out failure diagnosis, the execution mode of this failure diagnosis can be narrated from following three aspects:
When main website utilizes the MB+ bus that slave station and I/O equipment thereof are carried out failure diagnosis, need to send two kinds of diagnosis messages, be called slave station failure diagnosis message and expansion I/O equipment fault diagnosis message respectively.
Slave station failure diagnosis message adopts general No. 3 Modbus instruction, and the memory block of the fault message through reading slave station obtains the fault message of equipment, and its message format is following:
Slave station failure diagnosis message:
The slave station failure diagnosis message coding table of table 4 MB+ bus
Positive response message:
The positive response message coding schedule of the slave station failure diagnosis of table 5 MB+ bus
The Negative Acknowledgment message:
Overtime.
Expansion I/O equipment fault diagnosis message adopts self-defining No. 31 Modbus instruction, as transmitting instruction.This message can not directly send to expansion I/O equipment, needs slave station as middle repeater station.Main website sends to slave station with this message, and slave station is judged it for E-Packeting according to function number, just removes the check information of slave station information He latter two byte of preceding two bytes of this message, repacks, and is transmitted to expansion I/O equipment.For the response message of expansion I/O equipment, slave station still need be repacked processing, just can postback to main website.Its message format is following:
Expansion I/O equipment fault diagnosis message:
The expansion I/O equipment fault diagnosis message coding table of table 6 MB+ bus
Positive response message:
The positive response message coding schedule of the expansion I/O equipment fault diagnosis of table 7 MB+ bus
The Negative Acknowledgment message:
Overtime.
When carrying out failure diagnosis, the MB+ bus adopts the bus working method.Main website adopts the message of will diagnosing in polling mode cycle to send on the bus; Slave station is according to the device address of self; Judge whether to accept the diagnosis message; If the dateout of diagnosis message assigned address is consistent with the device address of certain slave station; Then this slave station is accepted this message; And, judge the diagnosis object of this message according to function number, function number then sends to main website with the fault message of self with the mode of positive response message for 0x03; Function number is then removed the check information of slave station information He latter two byte of preceding two bytes of this message for 0x1F, repacks, and is transmitted to the I/O equipment of being with, and with the response message of I/O equipment, processing is packed again, postbacks to main website again.So one week of poll, main website just accomplishes the failure diagnosis to whole slave stations and I/O equipment thereof.
fault type
The discernible fault of the fault detection system that the present invention designed is divided into three ranks.The fault of highest level is the hardware classes fault, and this type of fault can influence the performance of system or directly cause equipment to crash.Next is the loop communication failure, and this type of fault can cause system communication interruption or entanglement.Be the software level fault once more, this type of fault can the mode through software be repaired under situation not out of service.
After back message using is received by main website, analyze the fault message that slave station and I/O equipment thereof are responded, judge that whether they have fault to take place, if fault is arranged, confirm fault type.The fault message of equipment leaves in 6 bytes of appointment in back message using, and each fault rank accounts for 2 bytes and amounts to 16.High 4 bit representation fault ranks are divided into three ranks.Remain the fault type of 12 bit representations under this fault rank.
(2) fault location
Through failure diagnosis, confirm fault type after, main website should carry out fault location, confirms the position of breaking down, and notifies malfunctioning node at once, the prompting user safeguards.The concrete implementation process of fault location once is described below.
Each slave station or expansion I/O equipment all have the device address, and this address can be used as witness marker.When main website sent the diagnosis message, slave station and I/O equipment thereof was according to the device address of self, the diagnosis message that selection will be accepted, and the device address of backfill oneself in response message.Therefore, main website just confirms the position of faulty equipment when confirming fault type, in time accomplish fault location, and can notify the user to carry out troubleshooting the very first time.
(3) communication redundancy
After detecting the ReBUS bus and breaking down, system will use the MB+ bus to continue communication automatically, and normal read-write IO data are accomplished each item traffic operation.Because the MB+ bus adopts serial communication, to compare communication speed lower with the ReBUS bus.
communication message
When main website utilizes the MB+ bus that slave station and I/O equipment thereof are communicated redundancy, need to send two kinds of messages, be called slave station real time communication message and expansion I/O equipment real time communication message respectively.
Slave station real time communication message adopts self-defining No. 65 Modbus instruction, constitutes the message that is exclusively used in the MB+ bus communication.Through this message the IO resource of slave station is carried out read-write operation, main website can be through the data interaction of this message completion with certain slave station, and its message format is following:
Slave station real time communication message:
The slave station real time communication message coding table of table 8 MB+ bus
Positive response message:
The positive response message coding schedule of the slave station real time communication of table 9 MB+ bus
The Negative Acknowledgment message:
Overtime.
Expansion I/O equipment real time communication message adopts self-defining No. 31 Modbus instruction, equally as transmitting instruction.Its communication mode is similar with expansion I/O equipment fault diagnosis message, needs slave station as middle repeater station equally.Main website sends to slave station with this message, and slave station is judged it for E-Packeting according to function number, removes the check information of slave station information He latter two byte of preceding two bytes of this message, repacks, and is transmitted to expansion I/O equipment.For the response message of expansion I/O equipment, slave station still need be repacked processing, just can postback to main website.Its message format is following:
Expansion I/O equipment real time communication message:
The expansion I/O equipment real time communication message of table 10 MB+ bus
Positive response message:
The positive response message of expansion I/O equipment real time communication of table 11 MB+ bus
The Negative Acknowledgment message:
Overtime.
When communicating redundancy, the MB+ bus adopts one one mode of receiving.Main website carries out data communication according to different slave station corresponding equipment address with each slave station and I/O equipment thereof.Slave station is according to the device address of self; Judge whether to accept this message; If the dateout of communication message assigned address is consistent with the device address of certain slave station; Then this slave station is accepted this message; And according to function number, judge the communication object of this message, function number be 0x41 then according to configuration from message assigned address copy dateout; And the backfill image data, send to main website with the mode of positive response message; Function number is then removed the check information of slave station information He latter two byte of preceding two bytes of this communication message for 0x1F, repacks, and is transmitted to the I/O equipment of being with, and with the response message of I/O equipment, processing is packed again, postbacks to main website again.Main website can so one week of poll, just realize the IO resource mapping to all slave stations and I/O equipment thereof through the data interaction of this message completion with certain slave station or expansion I/O equipment.
Through above-mentioned narration, adopt the MB+ bus to realize that the process of fault detect may be summarized to be following 3 points:
After detecting malfunctioning node, if the user replaces malfunctioning node, hand-reset then repeats aforesaid operations, recovers ReBUS bus communication function.
The above; Only be the preferable embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (2)
1. D-BUS high-speed bus technology based on ring-like Ethernet and auxiliary network is characterized in that:
D-BUS (Dual-BUS) high-speed bus network is made up of ring-like Ethernet ReBUS of high speed and auxiliary network MB+;
The physical layer of ReBUS bussing technique adopts the IEEE802.3 ethernet specification; Main website is formed ring topology with slave station with the mode of connecting; Main website and slave station; Adopt identical mode of connection between slave station and the slave station; The receiving terminal of each equipment links to each other with the transmitting terminal of previous equipment; And the transmitting terminal of this equipment links to each other with the receiving terminal of a back equipment, connects to form ring-like ReBUS bus network successively;
I/O equipment is connected with slave station through the RS485 serial ports, as the expansion I/O of slave station, carries out data communication with main website;
The D-BUS high-speed bus adopts the MB+ bussing technique in addition, through serial ports main website and slave station is connected on the same bus, and adopts polling mode that each slave station is carried out fault detect, comprises failure diagnosis, fault location and three functions of communication redundancy.
2. a kind of D-BUS high-speed bus technology based on ring-like Ethernet and auxiliary network according to claim 1 is characterized in that:
The ReBUS bussing technique uses the IEEE802.3 ethernet frame structural transmission ReBUS message of standard, and the data field of every message comprises many strips message, and main website can accomplish reading and writing or read-write operation to a plurality of slave stations and I/O equipment thereof through sub-message;
The ReBUS bussing technique provides four kinds of communication services, comprising: read to serve, write service, read-write service and expansion service, through the service of reading, main website can read the register data of one or more slave stations; Through writing service; Main website can write data in the corresponding registers of one or more slave stations; Through this service; Also can realize the Memory Management Unit configuration between the master-salve station; Through the read-write service; The readable register data of writing one or more slave stations of main website, through expansion service, main website can obtain each slave station with the facility information of I/O equipment;
The ReBUS bussing technique provides 13 kinds of orders: increase read command certainly, increase write order, node read command, node write order, broadcasting read command, broadcasting write order, logic read command, logic write order, logic read write command, secondary equipment scan command, secondary equipment been scanned querying command, the read command of secondary equipment number and the read command of secondary equipment type certainly, main website is through the communication service of mentioned order completion and slave station and I/O equipment thereof;
The ReBUS communication process is divided into three phases: initialization, and promptly main website carries out initialization through broadcasting command to all slave stations and I/O equipment thereof; The scanning configuration, promptly main website scans the information of each slave station and I/O equipment thereof, and is configured respectively; Real time communication, slave station and I/O equipment thereof are through after being configured to, and main website periodically sends the resource of real time communication order read-write slave station and IO equipment thereof;
The ReBUS bus adopts the master-slave communication mode, through the exchanges data of a message completion with the all-network node, or passes through many messages respectively at each network node swap data;
The ReBUS bus adopts ring topology, and equipment in the bus makes the real time communication message send and interrupts if fault causes the loop fracture, then realizes failure diagnosis, fault location and communication redundancy through the MB+ bussing technique;
Main website sends the diagnosis message through the MB+ bus and carries out failure diagnosis; The transmission node of slave station receives the diagnosis message; Judge diagnosis object; If self then directly handles and makes and replying; If I/O equipment then is transmitted to the expansion I/O device processes; Main website analyzes response message, and type with fault determines whether to break down;
After main website diagnoses fault, when confirming fault type, confirm the position of faulty equipment according to the device address;
After detecting the ReBUS bus failure, use the MB+ bus to substitute the ReBUS bus and carry out data communication.
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Application publication date: 20120208 |