JP4342441B2 - Opcサーバリダイレクションマネージャ - Google Patents
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- JP4342441B2 JP4342441B2 JP2004518199A JP2004518199A JP4342441B2 JP 4342441 B2 JP4342441 B2 JP 4342441B2 JP 2004518199 A JP2004518199 A JP 2004518199A JP 2004518199 A JP2004518199 A JP 2004518199A JP 4342441 B2 JP4342441 B2 JP 4342441B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1029—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers using data related to the state of servers by a load balancer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1034—Reaction to server failures by a load balancer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/55—Push-based network services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/563—Data redirection of data network streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/34—Director, elements to supervisory
- G05B2219/34263—OLE object linking and embedding, OPC ole for process control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/10015—Access to distributed or replicated servers, e.g. using brokers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/59—Providing operational support to end devices by off-loading in the network or by emulation, e.g. when they are unavailable
-
- 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
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
-
- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Hardware Redundancy (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
- Computer And Data Communications (AREA)
Description
および条件データベース122を有するOPCサーバ118と、ノードステータス変更プロバイダ124と、OPCサーバステータス変更プロバイダ126とを有する。現データ値がアイテムキャッシュ120に格納され、アラーム状態が条件データベース122に格納される。
本発明によるリダイレクションマネージャ102は、OPC Data Acceess2.05および1.0A、OPC Alarms and Events1.0、およびOPC Security1.0インターフェース、ならびに他のOPCデータアクセス、OPCアラーム/イベント、および現在知られている、または将来の他のOPCインターフェースをサポートすることができるOPCサーバである。リダイレクションマネージャ102は、実データソースと通信しないという意味では真のOPCサーバではなく、その代わりにクライアントコールを実際のOPCサーバに転送し、実際のOPCサーバからクライアントコールを転送するのに使用され、状態情報を維持するのに使用され、1次サーバに障害が発生したときにバックアップサーバに切り換えることが可能となる。リダイレクションマネージャ102は、プロセス外.exeサーバとして実現される(図2参照)。リダイレクションマネージャ102へのクライアント接続当たり1つの.exeサーバが存在する。クライアント接続の状態を変更するがIOを要求しないOPC要求は、1次サーバとバックアップサーバ、例えば1次OPCサーバノード104とバックアップOPCサーバノード106の両方に行われる。IO要求は1次OPCサーバ118だけに行われる。これにより、2次サーバがホットスタンバイモードにされる。1次OPCサーバ118に障害が発生した場合、リダイレクションマネージャ102は、バックアップOPCサーバ128を活動化し、IO要求を発行する。OPCクライアント101が切換えを認識しないので、OPCクライアント101は、OPCクライアント101自体でのエラー処理のシナリオを著しく削減することができる。リダイレクションマネージャ102は、コールドスタンバイ冗長方式もサポートする。この場合、状態はバックアップOPCサーバ128に複製されない。すべての状態が切換え時にセットアップされる。
図3に、リダイレクションマネージャによってクライアント接続が本発明に従ってどのように行われるかを示す。図3の上部のボックスで識別される各構成要素は、別々のプロセスで動作する。これらの構成要素は、クライアント101、リダイレクションマネージャ102、ノードステータス変更プロバイダ112、1次OPCサーバ118、1次サーバステータス変更プロバイダ126、2次OPCサーバ128、および2次サーバステータス変更プロバイダ136である。
Claims (4)
- OPCシステムのためのリダイレクション管理方法であって、前記OPCシステムにおいて、第1のOPCクライアント(101、206)及び第2のOPCクライアント(216)は、装置(108)に対してデータの読み出し及び書き込みをする第1のターゲットOPCサーバ(118、210)及び第2のターゲットOPCサーバ(128)と通信し、前記方法は、
前記第1及び第2のOPCクライアントと前記第1及び第2のターゲットOPCサーバとの間の通信のためのOPCリダイレクションマネージャ(102、202)を、
前記OPCリダイレクションマネージャの第1のインスタンス(208)に対する第1の専用接続を前記第1のOPCクライアントに付与することにより、前記第1のOPCクライアントからの第1のクライアント接続要求に応答し、
前記OPCリダイレクションマネージャの第2のインスタンス(218)に対する第2の専用接続を前記第2のOPCクライアントに付与することにより、前記第2のOPCクライアントからの第2のクライアント接続要求に応答する
ように動作させるステップであって、前記第2のインスタンスに障害が発生した場合に前記第2のOPCクライアントに対する前記第2の専用接続のみが切断されて前記第1のOPCクライアントに対する前記第1の専用接続が維持されるように、前記第1及び第2のインスタンスは第1及び第2の固有のアドレス空間で実行され、前記第1及び第2のターゲットOPCサーバの少なくとも1つは前記装置に接続される、ステップと、
前記OPCリダイレクションマネージャにより、前記第1のターゲットOPCサーバに接続するステップと、
前記OPCリダイレクションマネージャにより、前記第1のターゲットOPCサーバ用のOPCサーバステータス変更プロバイダ(126)に接続するステップと、
前記OPCリダイレクションマネージャにより、前記第1のターゲットOPCサーバをバックアップするように構成された前記第2のターゲットOPCサーバを含む少なくとも1つの追加のターゲットOPCサーバに接続するステップと、
前記OPCリダイレクションマネージャにより、前記第1のOPCクライアントからOPC add−group要求を受信するステップと、
前記OPCリダイレクションマネージャにより、前記OPC add−group要求を、add−groupパラメータとともに、前記OPC add−group要求に応答する前記第1のターゲットOPCサーバに転送するステップと、
前記第1のターゲットOPCサーバからrequest−completeイベントを受信したとき、前記OPCリダイレクションマネージャにより、少なくとも1つのグループを作成することにより、前記OPC add−group要求に関連する複数のadd−groupインターフェースを提供するステップと、
前記OPCリダイレクションマネージャにより、前記OPC add−group要求及び前記add−groupパラメータを、前記少なくとも1つの追加のターゲットOPCサーバのそれぞれに転送し、前記少なくとも1つのグループを非アクティブとして格納するステップと、
前記OPCリダイレクションマネージャにより、前記少なくとも1つのグループを含む、前記OPC add−group要求に関係する情報を格納するステップと
を含むリダイレクション管理方法。 - 前記OPCリダイレクションマネージャにより、前記第1のOPCクライアント(101)からOPC on−data−change要求を受信するステップと、
前記OPCリダイレクションマネージャにより、前記第1のターゲットOPCサーバ(118)と第1のシンクオブジェクトとの間で接続を確立するステップと、
前記OPCリダイレクションマネージャにより、前記第2のターゲットOPCサーバ(128)と第2のシンクオブジェクトとの間で接続を確立するステップと、
前記OPCリダイレクションマネージャにより、前記第1のターゲットOPCサーバからの第1のon−data−change要求を前記第1のOPCクライアントに与えるステップと、
前記OPCリダイレクションマネージャにより、前記少なくとも1つのグループを含む、前記OPC on−data−change要求に関係する情報を格納するステップとをさらに含む、請求項1に記載の方法。 - 前記第1のターゲットOPCサーバ(118)用の前記OPCサーバステータス変更プロバイダからアクティブサーバ障害イベントを受信したとき、前記OPCリダイレクションマネージャにより、前記第2のターゲットOPCサーバ(128)への切換えを実行するステップと、
前記OPCリダイレクションマネージャにより、前記第2のターゲットOPCサーバ上で前記少なくとも1つのグループをアクティブ化するステップと、
前記OPCリダイレクションマネージャにより、前記第2のターゲットOPCサーバからの第2のon−data−change要求を前記第1のOPCクライアント(101)に与えるステップとをさらに含む、請求項2に記載の方法。 - 前記OPCリダイレクションマネージャにより、前記第1のターゲットOPCサーバ(118)が現在利用可能であるという通知を前記OPCサーバステータス変更プロバイダ(126)から受信するステップと、
前記OPCリダイレクションマネージャにより、前記第1のターゲットOPCサーバに接続するステップと、
前記OPCリダイレクションマネージャにより、以前に格納した情報を使用して、前記少なくとも1つのグループを前記第1のターゲットOPCサーバに追加するステップとをさらに含む、請求項3に記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US39249302P | 2002-06-28 | 2002-06-28 | |
US10/403,704 US7496668B2 (en) | 2002-06-28 | 2003-03-31 | OPC server redirection manager |
PCT/US2003/020798 WO2004004283A1 (en) | 2002-06-28 | 2003-06-30 | Opc server redirection manager |
Publications (2)
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JP2005531855A JP2005531855A (ja) | 2005-10-20 |
JP4342441B2 true JP4342441B2 (ja) | 2009-10-14 |
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Application Number | Title | Priority Date | Filing Date |
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JP2004518199A Expired - Fee Related JP4342441B2 (ja) | 2002-06-28 | 2003-06-30 | Opcサーバリダイレクションマネージャ |
Country Status (7)
Country | Link |
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US (3) | US7496668B2 (ja) |
EP (1) | EP1518385B1 (ja) |
JP (1) | JP4342441B2 (ja) |
CN (1) | CN1679294A (ja) |
AU (1) | AU2003248788B2 (ja) |
CA (1) | CA2490980A1 (ja) |
WO (1) | WO2004004283A1 (ja) |
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US6898617B2 (en) * | 1999-11-18 | 2005-05-24 | International Business Machines Corporation | Method, system and program products for managing thread pools of a computing environment to avoid deadlock situations by dynamically altering eligible thread pools |
US6725104B2 (en) * | 2001-09-21 | 2004-04-20 | Siemens Aktiengesellschaft | Method and apparatus for E-mail based communication with automated facilities and devices |
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2003
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AU2003248788B2 (en) | 2007-08-09 |
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AU2003248788A1 (en) | 2004-01-19 |
EP1518385A1 (en) | 2005-03-30 |
WO2004004283A1 (en) | 2004-01-08 |
US20070198724A1 (en) | 2007-08-23 |
CN1679294A (zh) | 2005-10-05 |
EP1518385B1 (en) | 2011-08-17 |
US20040006624A1 (en) | 2004-01-08 |
CA2490980A1 (en) | 2004-01-08 |
US7496668B2 (en) | 2009-02-24 |
US7451215B2 (en) | 2008-11-11 |
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