WO2012124159A1 - Procédé de paramétrage d'adresse dans un système en réseau - Google Patents

Procédé de paramétrage d'adresse dans un système en réseau Download PDF

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Publication number
WO2012124159A1
WO2012124159A1 PCT/JP2011/056968 JP2011056968W WO2012124159A1 WO 2012124159 A1 WO2012124159 A1 WO 2012124159A1 JP 2011056968 W JP2011056968 W JP 2011056968W WO 2012124159 A1 WO2012124159 A1 WO 2012124159A1
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Prior art keywords
address
slave device
slave
assigned
abnormal
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PCT/JP2011/056968
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English (en)
Japanese (ja)
Inventor
豊 田原
寛仁 水本
成憲 澤田
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オムロン株式会社
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Publication of WO2012124159A1 publication Critical patent/WO2012124159A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5046—Resolving address allocation conflicts; Testing of addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5038—Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection

Definitions

  • the present invention relates to an address setting method in a network system having a master device and a slave device.
  • FA Vector's Automation
  • slave devices that collect and control data of production facilities installed in the factory, and a master device (PLC: Programmable Logic Controller) that centrally manages a plurality of slave devices.
  • PLC Programmable Logic Controller
  • the production system is controlled by the network system.
  • Ethernet As an example of an industrial network system for the FA field, development of a technology called industrial Ethernet applying Ethernet (registered trademark) technology is progressing.
  • Industrial Ethernet is also called industrial Ethernet or real-time Ethernet, and is a network in which Ethernet technology and equipment are introduced into the FA field at various layers.
  • EtherCAT Ethernet for Control Automation
  • ETG EtherCAT Technology
  • the address assigned to each slave device is determined centrally at the stage of designing the network configuration, and the address value is assigned to the slave device itself.
  • a design method of setting is adopted. In such a configuration, for example, “address unknown” in which no address value is set in the slave device, or “address unknown” in which there is a slave device in which an address value different from the address determined in the design stage exists Such an address abnormality may also occur.
  • Patent Document 1 proposes a method for supporting address setting of a printer connected to a PC network.
  • Patent Document 2 discloses a method for detecting the presence of a terminal to which an unauthorized IP address is set.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 11-282644 (published Oct. 15, 1999)”
  • Japanese Patent Publication Japanese Patent Laid-Open No. 2008-252924 (Released on October 16, 2008)”
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to easily and online when an address abnormality occurs in a network system composed of a master device and a plurality of slave devices. It is to provide a technique for recovering an address error.
  • a first aspect of the present invention is an address setting method in a network system composed of a master device and a plurality of slave devices, wherein the network system uses a node address uniquely assigned to each slave device.
  • the node address is set in advance in each slave device itself by a processing device built in the master device or connected to the master device.
  • Automatically assigning according to an address value, and the address setting method includes: an acquisition step in which the processing device acquires an address value set in each slave device from all slave devices on the network; The processing device overlaps with the address value set for other slave devices.
  • An abnormal extraction step for extracting a slave device having an address value to be set as an abnormal slave device, and for the slave device that is not an abnormal slave device, the processing device uses the address value set for each slave device as it is.
  • This network system is based on “static address assignment” in which node addresses are automatically assigned according to address values set in advance in the slave device itself.
  • static address assignment for example, when a slave device having an address value overlapping with another slave device is joined to the network, an address is assigned to assign the same node address to a plurality of slave devices. A system error occurs due to duplication.
  • the address values of all slave devices are collected to check whether there is any duplication. If duplication is detected, the address value is not assigned as a node address as it is, but a temporary node address is assigned so that duplication with other address values does not occur. Thereby, address duplication (node address collision) is automatically avoided, and communication using the node address (communication specifying the communication destination node) can be performed.
  • the second aspect of the present invention is a network system composed of a master device and a plurality of slave devices, and obtains an address value preset for each slave device from all slave devices on the network.
  • Acquisition means for extracting the slave device having an address value that overlaps with an address value set for another slave device as an abnormal slave device, and a slave device that is not an abnormal slave device Assigns the address value set for each slave device as it is as a node address, and assigns an address value that is not assigned to another slave device to the abnormal slave device as a temporary node address, and the address Node address assigned by setting means or temporary With over de address
  • a network system characterized in that it comprises communication means for performing communication identifying the communication destination node, the.
  • the third aspect of the present invention is a master device used in a network system composed of a master device and a plurality of slave devices, and is preset in each slave device from all slave devices on the network.
  • Address setting that assigns the address value set for each slave device as it is to the slave device as a node address for slave devices, and assigns the address value that is not assigned to other slave devices as a temporary node address for abnormal slave devices
  • Using the node address of the over-de address or temporary is a master apparatus, characterized in that it comprises communication means for performing communication to identify the destination node, the.
  • the address abnormality when an address abnormality occurs in a network system composed of a master device and a plurality of slave devices, the address abnormality can be recovered easily and online.
  • FIG. 1 It is a figure which shows an example of an address setting process. It is a block diagram explaining the structural example of an industrial network system. It is a figure explaining the communication system of position address mode. It is a flowchart which shows the flow of the slave information collection process performed by the master apparatus.
  • (A) is a diagram showing an example of an address management table
  • (B) is a diagram showing an example of actual configuration information
  • (C) is a diagram showing an example of network configuration information.
  • inspection / allocation process It is a flowchart which shows the flow of an alias change process. It is a figure which shows the modification of an address setting process.
  • an address setting method in a network system conforming to the EtherCAT standard is taken up, but the subject of the present invention is not limited to this. It is composed of a master device and a plurality of slave devices, and has a mode for performing communication specifying a communication destination node using a node address uniquely assigned to each slave device, and the node address is a slave device. Any network system that is automatically (statically) assigned according to the set value can be a target to which the present invention is applied.
  • an industrial network system 100 includes a master device 200 (PLC: Programmable Logic Controller) and a plurality of slave devices 300 directly via a cable 400, an I / O unit 500 provided in the device, and a hub device 700. Alternatively, it is formed by being indirectly connected.
  • the slave device 300 includes a power supply unit, a motor unit, a counter unit, an image unit, a communication unit, an I / O unit, and the like.
  • the master device 200 may be connected to a management device 600 for the user to perform operation settings of the master device 200, display of the operation status of the industrial network system 100, network design, and the like.
  • the management device 600 includes a personal computer installed with a design support tool and a management tool.
  • the address setting process described later is executed by the master device 200 or the management device 600 or by the cooperation of the master device 200 and the management device 600. That is, in the present embodiment, the master device 200 and / or the management device 600 corresponds to a processing device that is an execution subject of the address setting method of the present invention.
  • the hub device 700 has one port (IN port) 701 connected to the upstream side when the master device side is upstream, and a plurality of ports (OUT ports) 702a to 702c connected to the downstream side. .
  • a user can create a desired topology by connecting each device using a cable or a hub device while setting the order or branching.
  • the branch structure can be created not only by the hub device but also by connecting a plurality of slave devices downstream from the slave device.
  • EtherCAT it is possible to divert the cable 400 that is used in a general Ethernet standard, or to manufacture it in an Ethernet equipment manufacturing facility. This realizes cost reduction.
  • Such an industrial network system 100 is installed in, for example, a factory and used as an FA system.
  • the master device 200 transmits an information signal including control data through a network according to programs and operations.
  • the slave device 300 performs device operation based on the received information signal, and rewrite and return processing of the received information signal.
  • Production in a factory including the industrial network system 100 is achieved by the master device controlling the contents and timing of the operation so that the slave device as a whole works together to share the work.
  • the design support tool is provided as a function of the management apparatus 600.
  • the design support tool using the GUI displayed on the display of the management device 600, it is easy to select the slave device model, select the connection order and connection port (topology design), specify the node address assigned to each slave device, etc. Provide users with a design environment that can be done quickly.
  • Position address mode In this mode, the master-slave communication is performed using the position address.
  • the position address is a network address that is addressed in the order of connection when viewed from the master device.
  • FIG. 3 is a diagram for explaining a communication method in the position address mode.
  • a simple topology in which four slave devices 300a to 300d are connected in series to the master device 200 is shown.
  • position addresses of 0x0000, 0xFFFF, 0xFFFE, and 0xFFFD are assigned in the order closer to the master device 200.
  • the master device 200 adds the position address of the destination slave device to the message and transmits the message.
  • each slave device receives the message, it confirms the added address, and if it is “0x0000”, it determines that the message is addressed to itself. On the other hand, if the message is not addressed to itself, the slave device increments the address added to the message (adds 1).
  • the slave device 300c receives the message as addressed to itself.
  • the position address is determined by the physical connection order of the slave devices, there is an advantage that no address abnormality such as address duplication occurs.
  • the position address fluctuates depending on the network state (connection order and number of slave devices, topology, etc.), and is not suitable for performing critical communication. Therefore, communication by position address is used only for low-level communication processing such as collecting slave information at the time of network startup, for example, communication processing related to monitoring and management of slave devices and communication processing related to task execution, etc. Communication using node addresses and logical addresses described below is used.
  • Node Address Mode master-slave communication is performed using a node address that the master device 200 assigns to each slave device 300.
  • Each slave device 300 has an address value set in advance by the user, and this address value is held in a nonvolatile memory in the slave device.
  • the master device 200 reads an address value from each slave device 300 when the network is activated, and in principle assigns a node address having the same value as the address value to each slave device 300.
  • the address value as the setting value is hereinafter referred to as “alias”. Called.
  • this mode is used when event-type message communication specifying the slave device (node) of the communication partner is required, such as communication processing related to monitoring and management of the slave device.
  • the above-mentioned address abnormality may occur.
  • the address duplication node A system error occurs due to an address conflict.
  • an alias is not set for the slave device (address is undecided)
  • an error that a node address cannot be assigned to the slave device occurs.
  • Logical address mode This mode is used for cyclic communication using data called a frame.
  • a frame consists of data of a predetermined length, and a data area assigned to each slave device 300 is provided in the frame.
  • the logical address in this mode corresponds to an address indicating its own data area in the frame.
  • Frames periodically transmitted from the master device 200 pass through all the slave devices 300 in order, and then are returned by the slave device at the rear end (the most downstream side) and returned to the master device 200.
  • Each slave device 300 reads and writes data to and from its own data area when the frame passes through the device. As a result, high-speed data transmission and real-time performance are realized. Communication processing related to task execution is performed exclusively in the logical address mode.
  • FIG. 4 is a flowchart showing a flow of slave information collection processing (network scan processing) executed by the master device 200.
  • FIGS. 1A to 1D are diagrams illustrating an example of address setting processing.
  • the master device 200 executes the processing shown in FIG. 4 when the network is started or when the network configuration is changed (slave device joining or leaving).
  • the master device 200 confirms the number of slave devices present on the network (step S100).
  • This process is executed in the position address mode.
  • the number of slaves is “3”.
  • the master device 200 reads profile information and slave connection information from each of the slave devices 300a to 300c (step S101).
  • the profile information is information for identifying the slave device, and includes, for example, a product code, a vendor ID, a revision number, and the like of the slave device.
  • the slave connection information is information for understanding the connection configuration (topology) of the slave device, and includes, for example, information for specifying the connection destination device and port of the slave device. Based on this information, it is possible to grasp the components of the entire network and their topology.
  • the master device 200 reads the alias set in the slave device from each of the slave devices 300a to 300c, and updates the address management table (step S102).
  • the address management table is information in which aliases of all slave devices 300a to 300c are listed, and is used for address abnormality determination and node address assignment to be described later.
  • FIG. 5A is an example of an address management table obtained from the network of FIG. 1A, and aliases are described as “0x1, 0x2, 0x1” in the order of position addresses.
  • the address management table includes information on the value of the node address assigned to the slave device in addition to the information on the alias of the slave device (however, since the node address assignment is performed in the subsequent processing, the step (At the time of S102, the value of the node address is blank). The processing of steps S101 and S102 is also executed in the position address mode.
  • the master device 200 After executing the processing of steps S101 and S102 for all the slave devices 300a to 300c, the master device 200, based on the profile information, slave connection information, and address management table, actual configuration information representing the configuration of the network. Is created (step S103).
  • FIG. 5B is an example of actual configuration information obtained from the network of FIG.
  • the first slave device 300a is a device identified by “product code: a1, vendor ID: A, revision number: 002 (a1-A-002)”, and device “MASTER” (master device) ) And the alias setting is “0x1”.
  • the second slave device 300b is identified by “a3-A-000” and is connected to the “Out1” port of the device “a1-A-002” (slave device 300a), and the alias setting is “0x2”. It is.
  • the third slave device 300c is identified by “b0-B-005” and connected to the “Out2” port of the device “a3-A-000” (slave device 300b), and the alias setting is “0x1”. It is.
  • FIG. 6 is a flowchart showing the flow of address inspection / assignment processing. This process is executed by the master device 200 following the slave information collection process of FIG.
  • the master device 200 refers to the address management table for the first slave device 300a, thereby confirming whether the alias of the slave device 300a overlaps with the aliases of the other slave devices 300b and 300c (step). S200). If there is no duplication, the process proceeds to step S201. If duplication is detected, the process proceeds to step S204.
  • the master device 200 refers to the address management table, selects an address value that is not assigned to another slave device, and sets the address value as the “temporary node address” in the slave device 300a. .
  • the temporary value is assigned to the temporary node. Select as address. Therefore, the temporary node address “0x3” is assigned to the slave device 300a. This node address assignment is also executed in the position address mode. The value of the assigned node address is written in the address management table as shown on the right side of FIG.
  • the method of selecting a temporary node address is not limited to the above algorithm, and any algorithm may be used as long as address duplication with other slave devices can be avoided.
  • the largest value among the available addresses may be selected, or a certain number of address values may be reserved for the temporary node address in advance and selected from them.
  • the master device 200 confirms whether there is an alias overlap for the second slave device 300b as well (step S200). As shown in FIG. 5A, the alias of the slave device 300b is “0x2”, and there is no address duplication. Therefore, the master device 200 proceeds to step S201, and confirms whether or not the node address described in the network configuration information (setting information) includes one that matches the alias of the slave device 300b.
  • the network configuration information is data acquired from the design support tool or management tool of the management apparatus 600, and is data in which profile information, slave connection information, address information, etc. of each slave apparatus constituting the network system are described. It is.
  • the type of information included in the network configuration information is substantially the same as that included in the actual configuration information shown in FIG. 5B, but the actual configuration information is information collected from the actual network system.
  • the network configuration information is different in that it is design information (information indicating the network configuration intended by the user). If the network system is assembled as designed, the contents of both will be the same, but if the slave device model or connection destination is incorrect or the alias setting is incorrect, the network configuration information and the actual configuration information will not match. Become.
  • step S201 if the network configuration information does not match the slave device alias (address unknown), the process proceeds to step S204, and a temporary node address is assigned. If no alias is set for the slave device (address is undecided), the same network configuration information does not exist, so the process proceeds to step S204 and a temporary node address is assigned.
  • the master device 200 checks the profile information and the slave connection information (step S202). Although not shown, if the profile information and slave connection information do not match, an error message indicating that confirmation is required may be output to the display of the management apparatus 600 or the address setting process may be interrupted. Good.
  • the master device 200 assigns the same value “0x2” as the alias set in the slave device 300b to the slave device 300b as a node address (step S203).
  • the assigned node address value is written in the address management table.
  • the master device 200 confirms whether there is an alias overlap for the third slave device 300c as well (step S200). As shown in FIG. 5A, the alias of the slave device 300c is “0x1”, and there is an address overlap. Therefore, in step S204, the temporary node address “0x4” is assigned to the slave device 300c.
  • FIG. 1B shows a state in which node addresses have been set for all slave devices 300a to 300c. As described above, it is understood that temporary node addresses different from aliases are set in the first and third slave devices 300a and 300c that have caused address duplication.
  • FIG. 7 is a flowchart showing the flow of alias change processing. This process is a process applied to each abnormal slave device when there is a slave device (referred to as an abnormal slave device) to which a temporary node address is assigned in the address check / assignment process of FIG. . In the present embodiment, it is assumed that the following processing is executed by the management device 600 connected to the master device 200.
  • the management device 600 rewrites the alias setting of the abnormal slave device with a new address value (step S300).
  • a new address value is designated by the user who operates the management apparatus 600. Any new address value may be selected as long as it does not overlap with another slave device alias.
  • the management apparatus 600 can automatically determine instead of designating the user (for example, the temporary node address selected in step S204 in FIG. 6 may be selected as a new address value as it is).
  • the process of rewriting the alias setting is performed by node address mode communication using a temporary node address.
  • the management device 600 performs mailbox communication setting for the abnormal slave device to enter the mailbox communication state (step S301). Then, the management device 600 transmits a slave restart request to the abnormal slave device by mailbox communication, and restarts the abnormal slave device (step S302). Thereby, the alias rewritten in step S300 is validated in the slave device. Note that the processing in steps S302 and S303 is also performed by node address mode communication using a temporary node address.
  • the alias setting of the abnormal slave device can be changed to a value that does not overlap with the alias of the other slave device by online work from the management device 600.
  • FIG. 1C shows the alias setting of each slave device after the alias change process. It can be seen that the aliases of the slave devices 300a and 300c that have caused address duplication have been changed to different values.
  • the address information of the network configuration information stored in the management device 600 is updated automatically or by a user operation accordingly.
  • an alias is not assigned as a node address as it is, but another address value is assigned as a temporary node address. Thereby, address duplication (node address collision) is automatically avoided, and communication in the node address mode can be performed. Then, by rewriting the alias setting of the slave device and restarting the slave device using communication in the node address mode, it is possible to change the alias (eliminate the cause of the address abnormality) online. Therefore, offline work such as network system stop and slave device disconnection / setting change can be eliminated, so that the recovery work of address abnormality is much more efficient than before.
  • step S200 in FIG. 6 may be skipped, and the address duplication determination in step S200 may be performed only for a newly joined slave device.
  • the node addresses as aliases are assigned to the slave devices 300a and 300b, and the temporary node address “0x3” is assigned only to the slave device 300c. .
  • a first aspect of the present invention is an address setting method in a network system composed of a master device and a plurality of slave devices, wherein the network system uses a node address uniquely assigned to each slave device.
  • the node address is set in advance in each slave device itself by a processing device built in the master device or connected to the master device.
  • Automatically assigning according to an address value, and the address setting method includes: an acquisition step in which the processing device acquires an address value set in each slave device from all slave devices on the network; The processing device overlaps with the address value set for other slave devices.
  • An abnormal extraction step for extracting a slave device having an address value to be set as an abnormal slave device, and for the slave device that is not an abnormal slave device, the processing device uses the address value set for each slave device as it is.
  • This network system is based on “static address assignment” in which node addresses are automatically assigned according to address values set in advance in the slave device itself.
  • static address assignment for example, when a slave device having an address value overlapping with another slave device is joined to the network, an address is assigned to assign the same node address to a plurality of slave devices. A system error occurs due to duplication.
  • the address values of all slave devices are collected to check whether there is any duplication. If duplication is detected, the address value is not assigned as a node address as it is, but a temporary node address is assigned so that duplication with other address values does not occur. Thereby, address duplication (node address collision) is automatically avoided, and communication using the node address (communication specifying the communication destination node) can be performed.
  • the processing device further includes a changing step of changing an address value set in the abnormal slave device to an address value that does not overlap with an address value set in another slave device. It is preferable. Thereby, an appropriate address value that does not overlap with other slave devices is set for the slave device in which the address abnormality has occurred. Therefore, at least at the next network activation, the appropriate address value after the change is reflected, and a formal node address (not “temporary”) is assigned to the slave device.
  • the processing device may execute the obtaining step, the abnormal extracting step, and the address setting step again.
  • a formal node address according to the changed address value is automatically and promptly assigned to each slave device.
  • the address value set in the abnormal slave device can be automatically determined by the processing device, or can be selected (input) by the user operating the processing device. Further, the re-execution of the address setting after changing the address value may be performed not by the processing apparatus automatically but by a user instruction. Of course, it is possible to reduce the labor and time required for the recovery work more automatically by automating everything, but even in the case of a user operation, according to the present invention, it is possible to give an instruction online from the processing apparatus. Off-line work such as stoppage, slave device detachment, and setting changes can be eliminated, and recovery work can be made much more efficient.
  • the process of changing the address value of the abnormal slave device is performed by communication using the temporary node address assigned to the abnormal slave device.
  • the network system has a mode for performing communication using a position address determined by the connection order when viewed from the master device, and is set to each slave device from all slave devices on the network.
  • the process of acquiring the address value is preferably performed by communication using the position address.
  • a slave device for which an address value is not set is also extracted as an abnormal slave device.
  • an abnormal slave device it is possible to recover from a so-called “address undecided” abnormality.
  • the processing device stores in advance setting information in which a node address to be assigned to each slave device on the network is stored.
  • the processing device matches the node address described in the setting information. It is preferable that a slave device having an address value for which there is nothing to be extracted is also extracted as an abnormal slave device. Thereby, it is possible to recover from the so-called “address unknown” abnormality.
  • the present invention can be specified as an address setting method including at least a part of the above processing, or can be specified as a network system or a master device including at least a part of means for realizing the above processing.
  • Each of the above processes and means can be freely combined as long as no technical contradiction occurs.
  • the second aspect of the present invention is a network system composed of a master device and a plurality of slave devices, and obtains an address value preset for each slave device from all slave devices on the network.
  • Acquisition means for extracting the slave device having an address value that overlaps with an address value set for another slave device as an abnormal slave device, and a slave device that is not an abnormal slave device Assigns the address value set for each slave device as it is as a node address, and assigns an address value that is not assigned to another slave device to the abnormal slave device as a temporary node address, and the address Node address assigned by setting means or temporary With over de address
  • a network system characterized in that it comprises communication means for performing communication identifying the communication destination node, the.
  • the third aspect of the present invention is a master device used in a network system composed of a master device and a plurality of slave devices, and is preset in each slave device from all slave devices on the network.
  • Address setting that assigns the address value set for each slave device as it is to the slave device as a node address for slave devices, and assigns the address value that is not assigned to other slave devices as a temporary node address for abnormal slave devices
  • Using the node address of the over-de address or temporary is a master apparatus, characterized in that it comprises communication means for performing communication to identify the destination node, the.

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Abstract

La présente invention concerne une technique qui, dans un système en réseau, est destinée à une reprise sur erreur d'adressage qui s'exécute facilement et en ligne en cas d'erreur d'adressage. Un dispositif maître obtient de l'ensemble des dispositifs esclaves sur un réseau une valeur d'adresse paramétrée dans chaque dispositif esclave, puis extrait à titre de dispositif esclave erroné un dispositif esclave dans lequel il est paramétré une valeur d'adresse qui coïncide avec une valeur d'adresse paramétrée dans un autre dispositif esclave. Le dispositif maître attribue ensuite aux dispositifs esclaves autres que le dispositif esclave erroné la valeur d'adresse paramétrée dans chaque dispositif esclave en l'état à titre d'adresse de nœud, et il attribue au dispositif esclave erroné, à titre d'adresse de nœud provisoire, une valeur d'adresse non attribuée aux autres dispositifs esclaves.
PCT/JP2011/056968 2011-03-15 2011-03-23 Procédé de paramétrage d'adresse dans un système en réseau WO2012124159A1 (fr)

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JP2020150451A (ja) * 2019-03-14 2020-09-17 オムロン株式会社 制御システムおよび制御装置
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