JP3884335B2

JP3884335B2 - Parent-child transmission method and storage medium used for parent-child transmission method

Info

Publication number: JP3884335B2
Application number: JP2002195707A
Authority: JP
Inventors: 覚今村; 拓也和久津
Original assignee: Nippon Signal Co Ltd
Current assignee: Nippon Signal Co Ltd
Priority date: 2002-07-04
Filing date: 2002-07-04
Publication date: 2007-02-21
Anticipated expiration: 2022-07-04
Also published as: JP2004040537A

Description

【０００１】
【発明の属する技術分野】
本発明は、親局としての一次局に主系と従系とからなる二重系の子局としての二次局を接続した親子式伝送方式、特に、一次局と二次局の通信異常を検知する親子式伝送方式に関する。
【０００２】
【従来の技術】
従来、例えば、鉄道の運行管理システムにおいて、管理システムを構成する親局としての駅制御装置は、列車が当該駅の制御範囲に在線中に列車制御に関する処理の負荷が増大する。
【０００３】
一方、非列車在線時であってもダイヤ転送など非定常処理を行う必要があるので、列車制御に関する定常処理だけに駅制御装置のＣＰＵの能力を割り当てることはできない。
【０００４】
このため、駅制御装置は、ホームトラックの軌道回路が落下し、列車を検知しているとき以外は、非定常処理に備えてＣＰＵを空ける（負荷を軽減する）ことが必要であり、これにより性能の向上が図れる。
【０００５】
そこで、このような駅制御装置に二次局（子局）としての装置を接続し、駅制御装置を一次局（親局）とした親子式伝送方式を用いた場合、二次局との通信処理も、非定常処理に備えて、通信間隔をあける（ポーリング周期を大きくする）必要がある。
【０００６】
また、このような親子式伝送方式において、故障（例えば、通信異常）を検出した場合、二次局は一次局である駅制御装置から故障を出力する別途接点情報を取り込む必要がある。
【０００７】
他方、従来の親子式伝送方式は、一次局と二次局とが１対１の関係にあり、一次局がポーリング周期を変更する伝送方式において、二次局側が故障を検知するには、一次局の最長のポーリング周期を基準としてタイムアウトをカウントすることにより行う方式がある。
【０００８】
つまり、この方式は、最長のポーリング周期の時間を越えても、一次局からポーリングを受けない場合に、二次局ではタイムアウト（故障検知）とする。この方式では、二次局は最長ポーリング周期より短い時間では回線の故障を検知することができない。また、一次局は任意のタイミングでデータの送信ができるので、二次局より早く故障を検知することができる。
【０００９】
そこで、一次局から二次局に回線の故障を知らせる接点回路を設け、二次局が最長ポーリング周期より短い時間で回線の故障を検知する方式がある。この方式は、通信回線とは別に接点回路を設けるため、コストが高騰し、特に、一次局と二次局とが離れて設置されている場合には、大幅にコストが高騰する。
【００１０】
しかも、駅制御装置に二次局として二重系の装置を接続し、駅制御装置を一次局とした親子式伝送方式を行う場合には、この最長のポーリング周期による故障検知ではリアルタイムな系切り替えを行うことができない。
【００１１】
そこで、特開平１０−３２４２４６号公報では、一次局と二次局を接続する通信回線のみの使用によって、二次局がポーリング周期に従ったリアルタイムなタイムアウト検知を行うと共に、二重系からなる二次局の速やかな系切り替えを可能にする親子式伝送方式が提案されている。
【００１２】
図５は、特開平１０−３２４２４６号公報に開示された系切り替えを可能として親子式伝送方式のブロック図である。
【００１３】
図５において、１は駅制御装置等の親局としての一次局、２は主系２ａと従系２ｂとの二重系からなる駅地上装置等の子局としての二次局、３は列車検知装置、４は列車、５はホームトラックを表す。
【００１４】
一次局１に二次局２の主系２ａと従系２ｂとがマルチドロップ接続される。また、列車検知装置３は、列車４の移動に伴い、軌道回路毎に列車４の在線位置を一次局１に向けて出力する。
【００１５】
そして、一次局１がポーリング周期を速いモードに変更したとき、二次局２ではこの速いモードに合わせたタイムアウト検知時間に設定変更し、また、一次局１がポーリング周期を遅いモードに変更したとき、二次局２ではこの遅いモードに合わせたタイムアウト検知時間に設定変更し、いずれの場合も、二次局２が任意の回数だけ連続してタイムアウトを検知したとき、通信異常と判断し、主系２ａと従系２ｂとを切り替える。
【００１６】
図３は、このような親子式伝送方式にあって、任意回数連続してタイムアウトを検知する場合の具体例を示す。
【００１７】
図３（Ａ）において、一次局１から二次局主系２ａ並びに二次局従系２ｂの各々にポーリング送信されると、二次局主系２ａからのみ現示情報等が出力される構成となっている。
【００１８】
このような状態においては、図３（Ｂ）に示すように、一次局１から二次局主系２ａ並びに二次局従系２ｂへとポーリングＰが送信される。
【００１９】
ポーリングＰを受信した二次局主系２ａは、一次局１に対してポーリングＰを受信した旨のアンサーＡを送信すると同時に、二次局従系２ｂに対してもポーリングＰを受信した旨のアンサーＡを送信する。
【００２０】
これに対して、図３（Ｃ）に示すように、一次局１から二次局主系２ａ並びに二次局従系２ｂへとポーリングＰが送信されたにも拘らず、二次局主系２ａからポーリングＰを受信した旨のアンサーＡが送信されない場合、その状態が所定回数（図では３回）連続して継続した時点で、二次局従系２ｂは二次局主系２ａに対して故障である旨を系間伝送により認識させた上で、二次局主系２ａと二次局従系２ｂとの系切り替えを行う。
【００２１】
尚、このような二次局主系２ａからアンサーＡが送信されない場合としては、二次局主系２ａからアンサーＡを送信する二次局主系２ａのアンサー用の送信系の故障、一次局１と二次局主系２ａとの間の通信系の故障（例えば、ケーブルの断線や電波障害等）等が考えられる。
【００２２】
【発明が解決しようとする課題】
ところで、このような系切り替えシステムを有する親子式伝送方式では、実質的には二次局主系２ａに関する故障を診断するのみであった。
【００２３】
即ち、図４に示すように、一次局１から二次局主系２ａ並びに二次局従系２ｂへとポーリングＰが送信され、そのポーリングＰを二次局主系２ａ並びに二次局従系２ｂの双方で受信したにも拘らず、二次局主系２ａからのアンサーＡが二次局従系２ｂで受信できない場合においても、二次局従系２ｂでは上記図３（Ｃ）で示した二次局主系２ａにおけるアンサーＡの送信不可能状態と同一の結果となる。
【００２４】
尚、このような二次局主系２ａでポーリングＰを受信しているにも拘らず、二次局従系２ｂでアンサーＡが受信されない場合としては、二次局主系２ａから二次局従系２ｂへアンサーＡを送信する二次局主系２ａの送信系の故障、二次局主系２ａと二次局従系２ｂとの間のアンサー用の通信系の故障（例えば、ケーブルの断線や電波障害等）、二次局主系２ａから二次局従系２ｂへアンサーＡが送信された際の二次局従系２ｂの受信系の故障、等が考えられる。
【００２５】
また、図４に示した状態では、二次局主系２ａから一次局１へのアンサーＡは適式に送信・受信され、二次局主系２ａからのアンサーＡが二次局従系２ｂでは受信できなかった状態を示しているが、このような状態は、二次局主系２ａから二次局従系２ｂへと送信されるアンサーＡの配線等の物理的な送信経路の一部に二次局主系２ａから一次局１へと送信されるアンサーＡの配線等の物理的な送信経路を共有している場合にも考え得る。
【００２６】
このように、二次局主系２ａが一次局１からのポーリングＰを受信し且つ一次局１が二次局主系２ａからのアンサーＡを受信しているにも拘らず、二次局主系２ａからのアンサーＡが二次局従系２ｂで受信されない状態が所定回数（図では３回）連続して継続してしまうと、二次局従系２ｂは二次局主系２ａに対して故障である旨を系間伝送により認識させた上で、二次局主系２ａと二次局従系２ｂとの系切り替えを行い、以降、一次局１からのポーリングＰが切り替え後の二次局主系２ａに送信されると共に、切り替え後の二次局主系２ａから一次局１にアンサーＡが送信されることとなる。
【００２７】
従って、基本的には二次局従系２ｂ側に関する故障等に起因してアンサーＡが二次局従系２ｂで受信できない状態であるにも拘らず、二次局従系２ｂでは自身の故障とは判断せず、実質的には二次局主系２ａ側に関する故障を監視していることとなる。なお、基本的に系切り替えは必要以上に行わない方がよく、上述したような状態での系切り替えは、例え、切り替え後における送信系並びに受信系に何ら問題が発生せずとも、あまり好ましいものではない。
【００２８】
本発明は、上記問題を解決するため、二次局主系に関する故障判断と二次局従系に関する故障判断とを行うことができ、よって、二次局主系が正常であるにも拘らず、二次局従系に関する故障が原因で系切り替えを行ってしまうということが防止され、信頼性を向上させることができる親子式伝送方式を提供することを目的とする。
【００２９】
【課題を解決するための手段】
その目的を達成するため、本発明の親子式伝送方式は、親局としての一次局に主系と従系とからなる二重系の子局としての二次局が接続され、前記一次局から前記主系並びに前記従系の双方にポーリングが送信され、前記主系から前記一次局並びに前記従系にポーリングを受信した旨のアンサーが送信されることによって前記主系で適式にポーリング処理されたとする親子式伝送方式において、前記一次局における前記主系からの前記アンサーの受信の有無に関する受信有無情報が前記一次局から前記二次局に送信される次回のポーリングに重畳されることを特徴とする。
【００３０】
このような親子式伝送方式にあっては、主系と従系とからなる二重系の子局としての二次局が親局としての一次局に接続され、主系並びに従系の双方に一次局からポーリングが送信され、主系並びに従系にポーリングを受信した旨のアンサーが主系から送信されことによって主系で適式にポーリング処理されたとされると共に、一次局から二次局に送信される次回のポーリングには一次局における主系からのアンサーの受信の有無に関する受信有無情報が重畳される。
【００３１】
また、本発明の親子式伝送方式は、前記主系からの前記アンサーが前記従系で受信されず且つ前記一次局からの受信無情報を重畳した前記次回のポーリングが前記従系で受信された場合には前記主系と前記従系との系切り替えを行うことを特徴とする。
【００３２】
また、本発明の親子式伝送方式は、前記主系からの前記アンサーが前記従系で受信されず且つ前記一次局からの受信有情報を重畳した前記次回のポーリングが前記従系で受信された場合には前記主系と前記従系との系切り替えを行なわないことを特徴とする。
【００３３】
また、本発明の親子式伝送方式は、前記主系からの前記アンサーが前記従系で受信されている間は前記主系と前記従系との系切り替えを行なわないことを特徴とする。
【００３４】
さらに、本発明の親子式伝送方式は、前記一次局からのポーリングが前記従系で受信されない状態が継続した場合には前記主系からの前記アンサーの監視を停止することを特徴とする。
【００３５】
また、本発明の親子式伝送方式に用いられる記憶媒体は、親局としての一次局に主系と従系とからなる二重系の子局としての二次局が接続され、前記一次局から前記主系並びに前記従系の双方にポーリングが送信され、前記主系から前記一次局にポーリングを受信した旨のアンサーが送信され、前記一次局から前記主系からの前記アンサーを受信した旨のポーリングが前記二次局に送信されることによって前記主系で適式にポーリング処理がなされたことを判断する親子式システムに対して、前記一次局から前記二次局に送信されるポーリングに前記主系から前記一次局へのアンサーの受信の有無に関する受信有無情報を重畳させるためのデータを記憶していることを特徴とする。
【００３６】
さらに、本発明の親子式伝送方式に用いられる記憶媒体は、前記一次局に対して前記主系からのアンサーの受信の有無を監視する監視データファイルと、前記二次局に対して受信有無情報をポーリングに重畳するための重畳データファイルとが記憶されていることを特徴とする。
【００３７】
【発明の実施の形態】
次に、本発明の親子式伝送方式の実施の形態を図１及び図２に基づいて説明する。
【００３８】
図１（Ａ）は本発明に係わる親子式伝送方式のブロック図、図１（Ｂ）は正常な状態のときの伝送方式の説明図、図１（Ｃ）は二次局主系に関する故障に起因する系切り替えを行う一例の伝送方式の説明図、図２（Ａ）は二次局従系に関する故障があっても系切り替えを行なわない一例の伝送方式の説明図、図２（Ｂ）は一次局に故障があっても系切り替えを行なわない一例の伝送方式の説明図、図２（Ｃ）は二次局従系に故障があっても系切り替えを行なわない他例の伝送方式の説明図、図２（Ｄ）は応用例の伝送方式の説明図である。
【００３９】
図１（Ａ）において、１１は一次局、１２は二次局主系、１３は二次局従系である。
【００４０】
一次局１１は、図１（Ｂ）に示すように、二次局主系１２及び二次局従系１３に対してポーリングＰを送信する。また、一次局１１は、二次局主系１２からポーリングＰを受信した旨のアンサーＡを受信する。尚、二次局従系１３においても二次局主系１２からポーリングＰを受信したというアンサーＡを受信する。さらに、一次局１１は、二回目以降（次回）のポーリングＰを二次局主系１２及び二次局従系１３に対して送信する際、前回のポーリングＰの送信に基づく二次局主系１２からのアンサーＡの受信有情報を重畳したポーリングＰ’若しくは前回のポーリングＰの送信に基づく二次局主系１２からのアンサーＡの受信無情報を重畳したポーリングＰ”を送信する。
【００４１】
この受信有無情報を重畳したポーリングＰ’及びポーリングＰ”を送信するためには、少なくとも、一次局１１に対してアンサーＡの受信の有無を監視する監視データファイルと、受信有無情報をポーリングＰに重畳するための重畳データファイルとが記憶された記憶媒体（図示せず）を用い、このデータを直接一次局１１の元のデータに追加するか、一次局１１に対してデータ転送可能な制御装置等を経由して追加することにより容易に実現することができる。尚、元のシステム全データに新たなシステム全データを上書きするようにしても良い。
【００４２】
このような状態で、図１（Ｂ）に示すように、一次局１１から二次局主系１２並びに二次局従系１３へとポーリングＰが送信されると、それを受信した二次局主系１２は一次局１１に対してポーリングＰを受信した旨のアンサーＡを送信する。
【００４３】
同様に、二次局主系１２は二次局従系１３に対してポーリングＰを受信した旨のアンサーＡを送信する。この際、二次局主系１２は、アンサーＡを一次局１１並びに二次局従系１３に同時にアンサーＡを送信するが、二次局従系１３へのアンサーＡは、物理的には二次局主系１２から一次局１１へとアンサーＡを送信する送信経路を共有しても良いし、独自の送信経路（直通）としても良い。
【００４４】
二次局従系１３では、アンサーＡを受信することにより、直前のポーリングＰが二次局主系１２において実行されたことを認識する。
【００４５】
さらに、二回目以降のポーリング送信の場合には、前回のポーリングＰを送信した際に一次局１１において二次局主系１２から送信されたアンサーＡを受信した旨の受信有情報を重畳したポーリングＰ’が一次局１１から二次局主系１２並びに二次局従系１３に送信される。
【００４６】
これにより、二次局従系１３は、二次局主系１２に何ら問題（故障）が発生していないことを認識することができ、以降、系切り替えを行うことなくポーリングＰ’の受信が行われる。
【００４７】
これに対して、図１（Ｃ）に示すように、二次局主系１２に関して何らかの故障が発生し、一次局１１から二次局主系１２並びに二次局従系１３へとポーリングＰが送信され、そのポーリングＰを二次局主系１２並びに二次局従系１３の双方で受信しているにも拘らず、一次局１１並びに二次局従系１３では二次局主系１２からのポーリングＰを受信した旨のアンサーＡが受信されない場合が想定される。
【００４８】
尚、上述した二次局主系１２に関して何らかの故障が発生して一次局１１でアンサーＡが受信されない場合としては、二次局主系１２から一次局１１へアンサーＡを送信する二次局主系１２の送信系の故障、一次局１１と二次局主系１２との間のアンサー用の通信系の故障（例えば、ケーブルの断線や電波障害等）、二次局主系１２から一次局１１へアンサーＡが送信された際の一次局１１の受信系の故障、等が考えられる。
【００４９】
このように、二次局主系１２及び二次局従系１３の何れもが一次局１１からのポーリングＰを受信しているにも拘らず、一次局１１並びに二次局従系１３の双方でアンサーＡが受信されていない場合にあっては、次回のポーリングＰを二次局主系１２並びに二次局従系１３に送信する際、前回のポーリングＰの送信に対して一次局１１ではアンサーＡを受信していない旨の受信無情報を重畳したポーリングＰ”が一次局１１から送信される。
【００５０】
これにより、受信無情報を重畳したポーリングＰ”が所定回数（図では３回）連続した時点で、二次局従系１３は二次局主系１２に対して故障である旨を系間伝送により認識させた上で、二次局主系１２と二次局従系１３との系切り替えを行い、以降、一次局１１からのポーリングＰが切り替え後の二次局主系１２に送信されると共に、切り替え後の二次局主系１２から一次局１１にアンサーＡが送信される。
【００５１】
尚、切り替え前の二次局主系１２では、受信系には問題が無く送信系に問題が発生しているとも考え得るため、切り替え後の二次局主系１２と二次局従系１３の双方でポーリングＰを受信した後、切り替え後の二次局主系１２から切り替え後の二次局従系１３にアンサーＡを送信するようにしても良い。
【００５２】
一方、図２（Ａ）に示すように、二次局従系１３に関して何らかの故障が発生し、一次局１１から二次局主系１２並びに二次局従系１３へとポーリングＰが送信され、二次局主系１２からのポーリングＰを受信した旨のアンサーＡが一次局１１で受信されたにも拘らず、二次局主系１２からのポーリングＰを受信した旨のアンサーＡが二次局従系１３では受信されない場合には、次回のポーリングＰを二次局主系１２並びに二次局従系１３に送信する際、前回のポーリングＰの送信に対して一次局１１ではアンサーＡを受信している旨の受信有情報を重畳したポーリングＰ’が送信される。
【００５３】
これにより、受信有情報を重畳したポーリングＰ’が二次局従系１３で受信されている限り、二次局主系１２では何ら問題が発生していないと判断して系切り替えは行われず、そのままの状態が維持される。
【００５４】
尚、上述した二次局従系１３に関して何らかの故障が発生してアンサーＡが受信されない場合としては、二次局主系１２と二次局従系１３との間の送信系の故障（二次局主系１２と一次局１１との間の送信経路を共有しない場合）、一次局１１と二次局従系１３との間の送信系の故障や（二次局主系１２と一次局１１との間の送信経路を共有した場合）、アンサーＡが送信された際の二次局従系１３の受信系の故障、等が考えられる。
【００５５】
また、図２（Ｂ）に示すように、一次局１１に関して何らかの故障が発生し、一次局１１から二次局主系１２並びに二次局従系１３へとポーリングＰが送信され、二次局主系１２からのポーリングＰを受信した旨のアンサーＡが二次局従系１３では受信されたにも拘らず、二次局主系１２からのポーリングＰを受信した旨のアンサーＡが一次局１１では受信されない場合には、次回のポーリングＰを二次局主系１２並びに二次局従系１３に送信する際、前回のポーリングＰの送信に対して一次局１１ではアンサーＡを受信していない旨の受信無情報を重畳したポーリングＰ”が送信されるが、二次局従系１３においてアンサーＡを受信している限りにおいては、二次局主系１２ではポーリングＰの受信もアンサーＡの送信も適式に行われていると判断して系切り替えは行われず、そのままの状態が維持される。
【００５６】
また、図２（Ｃ）に示すように、二次局従系１３に関して何らかの故障が発生し、一次局１１から二次局主系１２並びに二次局従系１３へとポーリングＰが送信されたにも拘らず、二次局従系１３ではポーリングＰもアンサーＡも受信されない状態が継続（図では、３回）した場合には、二次局従系１３に故障が発生しているとして、二次局従系１３はアンサーＡの受信有無の監視を中止する（二次局主系１２からのアンサーＡの送信は継続しても良い）。
【００５７】
さらに、図２（Ｄ）に示すように、一次局１１に関して何らかの故障等が発生し、一次局１１から二次局主系１２並びに二次局従系１３へとポーリングＰが送信されると共に二次局主系１２からのポーリングＰを受信した旨のアンサーＡが一次局１１並びに二次局従系１３で受信されているのも拘らず、二回目以降で前回のポーリングＰの送信に対して一次局１１ではアンサーＡを受信していない旨の受信無情報を重畳したポーリングＰ”が送信されてきた場合には、二次局従系１３でアンサーＡを受信している限りにおいてポーリングＰ”の受信無情報を無視して系切り替えは行われず、そのままの状態が維持される。
【００５８】
ところで、本発明の親子式伝送方式にあっては、従来技術で説明した自動列車停止装置（所謂、ＡＴＳ）の地上装置等のほか、一つの親局としての一次局１１に対して二重系の子局としての二次局主系１２並びに二次局従系１３を備えたマルチドロップ形式の伝送方式において、二次局主系１２と二次局従系１３との間で系間伝送により系切り替えを行うもの全般に適用することができることは勿論である。
【００５９】
【発明の効果】
以上説明したように、本発明の親子式伝送方式にあっては、二次局主系に関する故障判断と二次局従系に関する故障判断とを行うことができ、よって、二次局主系が正常であるにも拘らず、二次局従系に関する故障が原因で系切り替えを行ってしまうことがなく、信頼性を向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係わる親子式伝送方式を示し、（Ａ）は本発明に係わる親子式伝送方式のブロック図、（Ｂ）は正常な状態のときの伝送方式の説明図、（Ｃ）は二次局主系に関する故障に起因する系切り替えを行う他例の伝送方式の説明図である。
【図２】本発明の実施の形態に係わる親子式伝送方式を示し、（Ａ）は二次局従系に関する故障があっても系切り替えを行なわない一例の伝送方式の説明図、（Ｂ）は一次局に故障があっても系切り替えを行なわない他例の伝送方式の説明図、（Ｃ）は二次局従系に故障があっても系切り替えを行なわない他例の伝送方式の説明図、（Ｄ）は応用例の伝送方式の説明図である。
【図３】従来の親子式伝送方式を示し、（Ａ）は親子式伝送方式のブロック図、（Ｂ）は正常な状態のときの伝送方式の説明図、（Ｃ）は二次局主系に関する故障に起因する系切り替えを行う伝送方式の説明図である。
【図４】従来の親子式伝送方式を示し、二次局従系に関する故障に起因して系切り替えを行ってしまう例の伝送方式の説明図である。
【図５】従来の親子式伝送方式を利用した自動列車停止装置のブロック図である。
【符号の説明】
１１一次局、１２二次局主系、１３二次局従系、Ｐポーリング、Ｐ’ポーリング（受信有情報を重畳したポーリング）、Ｐ” ポーリング（受信無情報を重畳したポーリング）、Ａアンサー。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a master-slave transmission system in which a secondary station as a secondary slave station composed of a primary system and a slave system is connected to a primary station as a master station, in particular, communication abnormality between the primary station and the secondary station. The present invention relates to a parent-child transmission method to be detected.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in a railway operation management system, a station control device as a master station constituting a management system increases the processing load related to train control while the train is in the control range of the station.
[0003]
On the other hand, since it is necessary to perform non-stationary processing such as diamond transfer even when the train is not on the line, the CPU capacity of the station controller cannot be assigned only to the steady processing related to train control.
[0004]
For this reason, the station control device needs to free up the CPU (reduce the load) in preparation for unsteady processing, except when the track circuit of the home track falls and the train is detected. The performance can be improved.
[0005]
Therefore, when a device as a secondary station (slave station) is connected to such a station control device and the master-slave transmission method is used with the station control device as the primary station (master station), communication with the secondary station is performed. As for processing, it is necessary to leave a communication interval (increase the polling cycle) in preparation for unsteady processing.
[0006]
Further, in such a parent-child transmission method, when a failure (for example, communication abnormality) is detected, the secondary station needs to take in additional contact information that outputs the failure from the station control device that is the primary station.
[0007]
On the other hand, in the conventional parent-child transmission method, there is a one-to-one relationship between the primary station and the secondary station, and in the transmission method in which the primary station changes the polling cycle, There is a method in which timeout is counted based on the longest polling cycle of the station.
[0008]
That is, in this method, if the polling is not received from the primary station even if the longest polling cycle time is exceeded, the secondary station sets a timeout (failure detection). In this method, the secondary station cannot detect a line failure in a time shorter than the longest polling cycle. Further, since the primary station can transmit data at an arbitrary timing, a failure can be detected earlier than the secondary station.
[0009]
Therefore, there is a system in which a contact circuit for notifying a line failure is provided from the primary station to the secondary station, and the secondary station detects the line failure in a time shorter than the longest polling cycle. In this method, since the contact circuit is provided separately from the communication line, the cost increases. In particular, when the primary station and the secondary station are installed apart from each other, the cost increases significantly.
[0010]
In addition, when a dual-system device is connected as a secondary station to the station control device and the parent-child transmission method is used with the station control device as the primary station, real-time system switching is performed for failure detection with this longest polling cycle. Can not do.
[0011]
Therefore, in Japanese Patent Laid-Open No. 10-324246, by using only the communication line connecting the primary station and the secondary station, the secondary station performs real-time timeout detection according to the polling period, and the dual system is used. A parent-child transmission method has been proposed that enables rapid system switching of the next station.
[0012]
FIG. 5 is a block diagram of a parent-child transmission system that enables system switching disclosed in Japanese Patent Laid-Open No. 10-324246.
[0013]
In FIG. 5, 1 is a primary station as a master station such as a station control device, 2 is a secondary station as a slave station such as a station ground device composed of a dual system of a main system 2a and a slave system 2b, and 3 is a train A detection device, 4 represents a train, and 5 represents a home track.
[0014]
The primary system 1 is connected to the primary system 2a and the secondary system 2b of the secondary station 2 by multidrop connection. In addition, the train detection device 3 outputs the on-line position of the train 4 to the primary station 1 for each track circuit as the train 4 moves.
[0015]
When the primary station 1 changes the polling cycle to the fast mode, the secondary station 2 changes the setting to the timeout detection time according to the fast mode, and when the primary station 1 changes the polling cycle to the slow mode. In the secondary station 2, the setting is changed to the timeout detection time adapted to this slow mode. In any case, when the secondary station 2 continuously detects the timeout for an arbitrary number of times, it is determined that the communication is abnormal, The system 2a and the slave system 2b are switched.
[0016]
FIG. 3 shows a specific example in the case where such a parent-child transmission method detects a timeout continuously any number of times.
[0017]
In FIG. 3A, when polling transmission is performed from the primary station 1 to each of the secondary station master system 2a and the secondary station slave system 2b, the display information and the like are output only from the secondary station master system 2a. It has become.
[0018]
In such a state, as shown in FIG. 3B, polling P is transmitted from the primary station 1 to the secondary station master system 2a and the secondary station slave system 2b.
[0019]
The secondary station master system 2a that has received the polling P transmits an answer A indicating that the polling P has been received to the primary station 1, and at the same time indicates that the secondary station secondary system 2b has also received the polling P. Send answer A.
[0020]
On the other hand, as shown in FIG. 3C, the secondary station master system is transmitted despite the polling P being transmitted from the primary station 1 to the secondary station master system 2a and the secondary station slave system 2b. When the answer A indicating that the polling P has been received from the terminal 2a is not transmitted, the secondary station slave system 2b sends the secondary station master system 2a to the secondary station main system 2a when the state continues for a predetermined number of times (three times in the figure). Then, the system switching between the secondary station master system 2a and the secondary station slave system 2b is performed after recognizing that the fault has occurred.
[0021]
Incidentally, in the case where the answer A is not transmitted from the secondary station main system 2a, a failure in the transmission system for the answer of the secondary station main system 2a that transmits the answer A from the secondary station main system 2a, the primary station A failure in the communication system between the primary station 2a and the secondary station main system 2a (for example, cable disconnection or radio wave interference) may be considered.
[0022]
[Problems to be solved by the invention]
By the way, in the parent-child transmission system having such a system switching system, substantially only a failure relating to the secondary station main system 2a is diagnosed.
[0023]
That is, as shown in FIG. 4, the polling P is transmitted from the primary station 1 to the secondary station master system 2a and the secondary station slave system 2b, and the polling P is transmitted to the secondary station master system 2a and the secondary station slave system. Even if the answer A from the secondary station master system 2a cannot be received by the secondary station slave system 2b even though it is received by both of the stations 2b, the secondary station slave system 2b shows the above-mentioned FIG. In addition, the result is the same as the state in which the answer A cannot be transmitted in the secondary station main system 2a.
[0024]
Incidentally, in the case where the answer A is not received by the secondary station slave system 2b even though the polling P is received by the secondary station master system 2a, the secondary station master system 2a to the secondary station Failure of the transmission system of the secondary station master system 2a that transmits the answer A to the slave system 2b, failure of the communication system for the answer between the secondary station master system 2a and the secondary station slave system 2b (for example, cable Possible causes include failure of the reception system of the secondary station slave system 2b when the answer A is transmitted from the secondary station master system 2a to the secondary station slave system 2b.
[0025]
In the state shown in FIG. 4, the answer A from the secondary station master system 2a to the primary station 1 is properly transmitted and received, and the answer A from the secondary station master system 2a is sent to the secondary station slave system 2b. Shows a state that could not be received, but such a state is a part of a physical transmission path such as wiring of answer A transmitted from the secondary station master system 2a to the secondary station slave system 2b. It is also conceivable that a physical transmission path such as the wiring of the answer A transmitted from the secondary station main system 2a to the primary station 1 is shared.
[0026]
In this way, the secondary station master 2a receives the polling P from the primary station 1 and the primary station 1 receives the answer A from the secondary station master 2a. If the state where the answer A from the system 2a is not received by the secondary station slave system 2b continues continuously for a predetermined number of times (three times in the figure), the secondary station slave system 2b The system is switched between the secondary station master system 2a and the secondary station slave system 2b after the fact that the failure is detected by inter-system transmission, and thereafter, the polling P from the primary station 1 is switched to the second The answer A is transmitted from the secondary station main system 2a after switching to the primary station 1 while being transmitted to the next station main system 2a.
[0027]
Therefore, basically, the secondary station slave system 2b has its own failure even though the answer A cannot be received by the secondary station slave system 2b due to a failure related to the secondary station slave system 2b. In other words, the failure related to the secondary station main system 2a is monitored. Basically, it is better not to perform system switching more than necessary, and system switching in the above-described state is much preferable even if no problems occur in the transmission system and the receiving system after switching. is not.
[0028]
In order to solve the above-mentioned problem, the present invention can make a failure determination on the secondary station master system and a failure determination on the secondary station slave system, and thus the secondary station master system is normal although it is normal. An object of the present invention is to provide a parent-child transmission method that can prevent system switching due to a failure related to a secondary station slave system and improve reliability.
[0029]
[Means for Solving the Problems]
In order to achieve the object, the master-slave transmission system of the present invention is configured such that a secondary station as a secondary slave station composed of a master system and a slave system is connected to a primary station as a master station, and the primary station Polling is transmitted to both the master system and the slave system, and an answer to the effect that polling has been received is transmitted from the master system to the primary station and the slave system. In the parent-child transmission method, the reception presence / absence information related to the presence / absence of reception of the answer from the main system in the primary station is superimposed on the next polling transmitted from the primary station to the secondary station. And
[0030]
In such a master-slave transmission system, a secondary station as a dual slave station composed of a master system and a slave system is connected to the primary station as a master station, and both the master system and the slave system are connected. Polling is transmitted from the primary station, and an answer to the effect that polling has been received by the primary system and the secondary system is transmitted from the primary system, so that the primary system is properly polled, and from the primary station to the secondary station. The next polling to be transmitted is superimposed with the reception presence / absence information regarding the presence / absence of reception of the answer from the primary system in the primary station.
[0031]
Further, in the parent-child transmission system of the present invention, the answer from the master system is not received by the slave system, and the next polling in which no reception information from the primary station is superimposed is received by the slave system. In this case, the system is switched between the main system and the slave system.
[0032]
Further, in the parent-child transmission method of the present invention, the answer from the master is not received by the slave and the next polling in which the received information from the primary station is superimposed is received by the slave. In this case, system switching between the main system and the slave system is not performed.
[0033]
The parent-child transmission system of the present invention is characterized in that system switching between the master system and the slave system is not performed while the answer from the master system is received by the slave system.
[0034]
Furthermore, the parent-child transmission system of the present invention is characterized in that monitoring of the answer from the master system is stopped when a state where polling from the primary station is not received by the slave system continues.
[0035]
In addition, the storage medium used in the parent-child transmission system of the present invention is connected to a primary station as a master station and a secondary station as a secondary slave station composed of a master system and a slave system. Polling is transmitted to both the master system and the slave system, an answer to the effect that polling has been received is transmitted from the master system to the primary station, and the answer from the primary system is received from the primary station For a parent-child system that determines that polling processing has been appropriately performed in the main system by transmitting polling to the secondary station, polling transmitted from the primary station to the secondary station Data for superimposing reception presence / absence information on whether or not an answer is received from the main system to the primary station is stored.
[0036]
Furthermore, the storage medium used in the parent-child transmission system of the present invention includes a monitoring data file for monitoring whether or not the primary station has received an answer from the main system, and reception information on the secondary station. And a superimposition data file for superimposing on the polling.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the parent-child transmission system of the present invention will be described based on FIG. 1 and FIG.
[0038]
FIG. 1A is a block diagram of a parent-child transmission system according to the present invention, FIG. 1B is an explanatory diagram of a transmission system in a normal state, and FIG. 1C is a failure related to a secondary station main system. FIG. 2A is an explanatory diagram of an example of a transmission system that performs system switching, FIG. 2A is an explanatory diagram of an example of a transmission system that does not perform system switching even if there is a failure related to a secondary station slave system, and FIG. FIG. 2C is an explanatory diagram of an example of a transmission method in which system switching is not performed even if a failure occurs in the primary station, and FIG. 2C is a description of another example of a transmission method in which system switching is not performed even if a failure occurs in the secondary station slave system. FIG. 2 and FIG. 2D are explanatory diagrams of the transmission system of the application example.
[0039]
In FIG. 1A, 11 is a primary station, 12 is a secondary station master system, and 13 is a secondary station slave system.
[0040]
As shown in FIG. 1B, the primary station 11 transmits a polling P to the secondary station master system 12 and the secondary station slave system 13. Further, the primary station 11 receives an answer A indicating that the polling P has been received from the secondary station main system 12. The secondary station slave system 13 also receives an answer A indicating that the polling P has been received from the secondary station master system 12. Further, when the primary station 11 transmits the second and subsequent (next) polling P to the secondary station main system 12 and the secondary station subordinate system 13, the secondary station main system based on the previous transmission of the polling P Polling P ′ on which the answer A reception information from 12 is superimposed, or polling P ″ on which no answer A reception information from the secondary station main system 12 is transmitted based on transmission of the previous polling P is transmitted.
[0041]
In order to transmit polling P ′ and polling P ″ on which this reception presence / absence information is superimposed, at least a monitoring data file for monitoring the presence / absence of reception of answer A to the primary station 11 and reception presence / absence information to polling P A control device which uses a storage medium (not shown) in which a superimposition data file for superimposition is stored and adds this data directly to the original data of the primary station 11 or transfers data to the primary station 11 It can be easily realized by adding via, for example, all of the original system data may be overwritten with new system data.
[0042]
In this state, as shown in FIG. 1B, when the polling P is transmitted from the primary station 11 to the secondary station master system 12 and the secondary station slave system 13, the secondary station that has received the polling P The main system 12 transmits an answer A indicating that the polling P has been received to the primary station 11.
[0043]
Similarly, the secondary station master system 12 transmits an answer A indicating that the polling P has been received to the secondary station slave system 13. At this time, the secondary station master system 12 transmits the answer A to the primary station 11 and the secondary station slave system 13 at the same time, but the answer A to the secondary station slave system 13 is physically A transmission path for transmitting the answer A from the secondary station main system 12 to the primary station 11 may be shared, or a unique transmission path (direct communication) may be used.
[0044]
By receiving the answer A, the secondary station slave system 13 recognizes that the immediately preceding polling P has been executed in the secondary station master system 12.
[0045]
Furthermore, in the case of the second and subsequent polling transmissions, the polling on which the received information indicating that the answer A transmitted from the secondary station main system 12 was received at the primary station 11 when the previous polling P was transmitted is superimposed. P ′ is transmitted from the primary station 11 to the secondary station master system 12 and the secondary station slave system 13.
[0046]
Thereby, the secondary station slave system 13 can recognize that no problem (failure) has occurred in the secondary station master system 12, and thereafter, the polling P ′ is received without switching the system. Done.
[0047]
On the other hand, as shown in FIG. 1C, some failure occurs in the secondary station main system 12, and the polling P is sent from the primary station 11 to the secondary station main system 12 and the secondary station slave system 13. Although the polling P is transmitted and received by both the secondary station master system 12 and the secondary station slave system 13, the primary station 11 and the secondary station slave system 13 receive the polling P from the secondary station master system 12. It is assumed that the answer A indicating that the polling P is received is not received.
[0048]
In the case where a failure occurs in the secondary station main system 12 and the primary station 11 does not receive the answer A, the secondary station master that transmits the answer A from the secondary station main system 12 to the primary station 11 is used. Failure of transmission system of system 12, failure of communication system for answering between primary station 11 and secondary station main system 12 (for example, cable disconnection, radio wave interference, etc.), secondary station main system 12 to primary station A failure of the receiving system of the primary station 11 when the answer A is transmitted to 11 is considered.
[0049]
As described above, both the primary station 11 and the secondary station slave system 13 are connected to each other although the secondary station master system 12 and the secondary station slave system 13 both receive the polling P from the primary station 11. In the case where the answer A is not received, when the next polling P is transmitted to the secondary station master system 12 and the secondary station slave system 13, the primary station 11 is compared with the previous polling P transmission. A polling P ″ on which no reception information indicating that the answer A has not been received is superimposed is transmitted from the primary station 11.
[0050]
As a result, the secondary station slave system 13 transmits an inter-system transmission to the secondary station master system 12 at the time when the polling P ″ superimposed with no-reception information continues for a predetermined number of times (three times in the figure). , The system switching between the secondary station master system 12 and the secondary station slave system 13 is performed. Thereafter, the polling P from the primary station 11 is transmitted to the secondary station master system 12 after switching. At the same time, the answer A is transmitted from the secondary station main system 12 after switching to the primary station 11.
[0051]
In the secondary station main system 12 before switching, there is no problem in the receiving system and it can be considered that there is a problem in the transmission system. Therefore, the secondary station main system 12 and the secondary station slave system 13 after switching. After receiving the polling P, the answer A may be transmitted from the secondary station master system 12 after switching to the secondary station slave system 13 after switching.
[0052]
On the other hand, as shown in FIG. 2 (A), some failure occurs in the secondary station slave system 13, and the polling P is transmitted from the primary station 11 to the secondary station master system 12 and the secondary station slave system 13. Although the answer A indicating that the polling P from the secondary station main system 12 has been received is received by the primary station 11, the answer A indicating that the polling P from the secondary station main system 12 has been received is the secondary. If it is not received by the station slave system 13, when the next polling P is transmitted to the secondary station master system 12 and the secondary station slave system 13, the primary station 11 sends an answer A to the previous polling P transmission. A polling P ′ on which reception information indicating reception is superimposed is transmitted.
[0053]
Thus, as long as the polling P ′ on which the received information is superimposed is received by the secondary station slave system 13, it is determined that no problem has occurred in the secondary station master system 12, and system switching is not performed. The state is maintained as it is.
[0054]
In the case where a failure occurs in the secondary station slave system 13 and the answer A is not received, a failure in the transmission system between the secondary station master system 12 and the secondary station slave system 13 (secondary (When the transmission path between the station master system 12 and the primary station 11 is not shared), a transmission system failure between the primary station 11 and the secondary station slave system 13 (the secondary station master system 12 and the primary station 11) And the transmission system of the secondary station slave system 13 when the answer A is transmitted may be considered.
[0055]
Also, as shown in FIG. 2B, some failure occurs in the primary station 11, and the polling P is transmitted from the primary station 11 to the secondary station master system 12 and the secondary station slave system 13, and the secondary station The answer A indicating that the polling P has been received from the secondary station master system 12 is received even though the answer A indicating that the polling P from the master system 12 has been received by the secondary station slave system 13. 11 is not received, when the next polling P is transmitted to the secondary station main system 12 and the secondary station slave system 13, the primary station 11 has received the answer A in response to the previous polling P transmission. Polling P "on which no-reception information is superimposed is transmitted, but as long as the secondary station slave system 13 receives the answer A, the secondary station master system 12 also receives the polling P. Is also well-formed It is determined that the system switching is not performed, the intact is maintained.
[0056]
Further, as shown in FIG. 2 (C), some failure has occurred in the secondary station slave system 13, and the polling P is transmitted from the primary station 11 to the secondary station master system 12 and the secondary station slave system 13. Nevertheless, if the secondary station slave system 13 continues to receive neither polling P nor answer A (three times in the figure), it is assumed that the secondary station slave system 13 has failed. The secondary station slave system 13 stops monitoring whether or not the answer A is received (the transmission of the answer A from the secondary station master system 12 may be continued).
[0057]
Further, as shown in FIG. 2 (D), some failure or the like occurs in the primary station 11, and the polling P is transmitted from the primary station 11 to the secondary station master system 12 and the secondary station slave system 13, and the secondary station 11 Despite the fact that the answer A indicating that the polling P has been received from the secondary station master system 12 has been received by the primary station 11 and the secondary station slave system 13, the transmission of the previous polling P will be performed after the second time. When the primary station 11 transmits a polling P ″ on which no reception information indicating that the answer A has not been received is transmitted, the polling P ″ as long as the secondary station slave 13 receives the answer A ”. The system switching is not performed ignoring the no-reception information, and the state is maintained as it is.
[0058]
By the way, in the parent-child transmission system of the present invention, in addition to the ground device of the automatic train stop device (so-called ATS) described in the prior art, a dual system is used for the primary station 11 as one parent station. In a multi-drop transmission system including a secondary station master system 12 and a secondary station slave system 13 as slave stations, inter-system transmission between the secondary station master system 12 and the secondary station slave system 13 Of course, the present invention can be applied to all systems that perform system switching.
[0059]
【The invention's effect】
As described above, in the parent-child transmission system of the present invention, it is possible to make a failure determination regarding the secondary station master system and a failure determination regarding the secondary station slave system. Although it is normal, system switching is not performed due to a failure related to the secondary station slave system, and reliability can be improved.
[Brief description of the drawings]
FIG. 1 shows a parent-child transmission system according to an embodiment of the present invention, in which (A) is a block diagram of the parent-child transmission system according to the present invention, and (B) is an explanatory diagram of the transmission system in a normal state. (C) is explanatory drawing of the transmission system of the other example which performs the system switch resulting from the failure regarding a secondary station main system.
2A and 2B show a parent-child transmission system according to an embodiment of the present invention, and FIG. 2A is an explanatory diagram of an example transmission system in which system switching is not performed even when there is a failure relating to a secondary station slave system; Is an explanatory diagram of another example transmission system that does not perform system switching even if there is a failure in the primary station, and (C) is an explanation of another example transmission system that does not perform system switching even if there is a failure in the secondary station slave system. FIG. 4D is an explanatory diagram of a transmission system of an application example.
3A and 3B show a conventional parent-child transmission system, where FIG. 3A is a block diagram of the parent-child transmission system, FIG. 3B is an explanatory diagram of the transmission system in a normal state, and FIG. 3C is a secondary station main system; It is explanatory drawing of the transmission system which performs the system switching resulting from the failure regarding.
FIG. 4 is a diagram illustrating a conventional parent-child transmission method and illustrating an example of a transmission method in which system switching is performed due to a failure related to a secondary station slave system.
FIG. 5 is a block diagram of an automatic train stop device using a conventional parent-child transmission system.
[Explanation of symbols]
11 Primary station, 12 Secondary station master system, 13 Secondary station slave system, P polling, P 'polling (polling with superposition of received information), P "polling (polling with superposition of non-reception information), A answer.

Claims

A secondary station as a secondary slave station composed of a master system and a slave system is connected to a primary station as a master station, and polling is transmitted from the primary station to both the master system and the slave system, In the master-slave transmission system that the polling process is properly performed in the master system by transmitting an answer to the effect that polling is received from the primary system to the primary station and the slave system,
A parent-child transmission method characterized in that reception presence / absence information relating to the presence / absence of reception of the answer from the main system in the primary station is superimposed on the next polling transmitted from the primary station to the secondary station.

When the answer from the master system is not received by the slave system and the next polling in which the non-reception information from the primary station is superimposed is received by the slave system, the master system and the slave system 2. The parent-child transmission system according to claim 1, wherein the system switching is performed.

When the answer from the master is not received by the slave and the next polling on which the received information from the primary station is superimposed is received by the slave, the master and the slave 3. The parent-child transmission system according to claim 1, wherein the system switching is not performed.

4. The system switching between the master system and the slave system is not performed while the answer from the master system is received by the slave system. The parent-child transmission method described.

The monitoring of the answer from the main system is stopped when the state where the polling from the primary station is not received by the subordinate system continues. The parent-child transmission method described.

A secondary station as a secondary slave station composed of a master system and a slave system is connected to a primary station as a master station, and polling is transmitted from the primary station to both the master system and the slave system, With respect to a parent-child system that is properly polled in the master system by transmitting an answer to the effect that polling has been received from the primary system to the primary station and the slave system, the primary station to the secondary station A storage medium storing data for superimposing reception presence / absence information on whether or not an answer is received from the main system to the primary station in a next polling transmitted to a station.

A monitoring data file for monitoring presence / absence of reception of an answer from the primary system in the primary station and a superimposition data file for superimposing reception presence / absence information on polling for the slave are stored. The storage medium according to claim 6.