JPH0818591A - Monitoring method for state of loop network - Google Patents
Monitoring method for state of loop networkInfo
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- JPH0818591A JPH0818591A JP6153153A JP15315394A JPH0818591A JP H0818591 A JPH0818591 A JP H0818591A JP 6153153 A JP6153153 A JP 6153153A JP 15315394 A JP15315394 A JP 15315394A JP H0818591 A JPH0818591 A JP H0818591A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、伝送装置を有する複数
の局がループ状の伝送路に接続されるＬＡＮ（Local Ar
ea Network) における、ループ状ネットワークの状態監
視方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a LAN (Local Ar) in which a plurality of stations having a transmission device are connected to a loop-shaped transmission path.
ea Network) for monitoring the status of loop networks.
【０００２】[0002]
【従来の技術】ＬＡＮにおいては、伝送路に接続する各
局の伝送路上での物理的な位置を局の監視装置のモニタ
ー画面に表示し、伝送路や各局の状態を監視し、異常発
生時の速やかな対処を可能にすることが要求されるの
で、監視装置には各局の伝送路上での接続順序を表すデ
ータを記憶させておく必要がある。このために従来は、
ＬＡＮの運転開始前に設計仕様に従って監視装置の記憶
部に接続順序を表すデータを入力し、また局の増設や切
り離しなどの変更が生ずる都度、監視装置の記憶部に格
納されている接続順序データの書換えを行っている。2. Description of the Related Art In a LAN, the physical position on the transmission line of each station connected to the transmission line is displayed on the monitor screen of the station monitoring device to monitor the state of the transmission line and each station and Since it is required to enable prompt measures, it is necessary for the monitoring device to store data indicating the connection order of the stations on the transmission path. For this reason, conventionally
Before starting the operation of the LAN, the data indicating the connection order is input to the storage unit of the monitoring device according to the design specifications, and the connection sequence data stored in the storage unit of the monitoring device is changed every time the station is added or disconnected. Is being rewritten.
【０００３】また、伝送路の異常に原因する伝送障害が
発生した場合は、異常箇所を特定するために伝送路を複
数の区間に分割し、分割された各単一の区間を順次伝送
路から分離して異常の有無を確認しつつ異常箇所に到達
する手法が採られている。Further, when a transmission failure occurs due to an abnormality in the transmission path, the transmission path is divided into a plurality of sections in order to identify the abnormal portion, and each of the divided single sections is sequentially extracted from the transmission path. A method is adopted that separates and confirms whether there is an abnormality and reaches the abnormal point.
【０００４】[0004]
【発明が解決しようとする課題】従来は複数の局がルー
プ状の伝送路に接続されたＬＡＮにおいても、ＬＡＮの
監視装置に格納すべき伝送路に接続する各局の接続順序
を表すデータは、前述のとおりに、ＬＡＮの運用開始時
に接続順序データを入力し、伝送路に接続する局の接続
順序に変更が生ずる都度、新たに接続されたり分離され
た局のループ上の位置を現場で確認し、各局の接続順序
データを書き換える必要があった。ところがＬＡＮが進
歩して様々な場所で多数のネットワークが使用されるよ
うになり、また一つのネットワークについてもネットワ
ークを構成する局数が増加し、また運転の都合上、局の
接続や切り離しも比較的頻繁に行われる場合もでてきた
ので、更新に要する手間がネットワークの運営上、無視
できないものとなってきた。さらに従来の方法によると
接続順序データに誤りがあったとしても直ちには判明し
難い欠点があった。Conventionally, even in a LAN in which a plurality of stations are connected to a loop-shaped transmission line, data representing the connection order of each station connected to the transmission line to be stored in the LAN monitoring device is: As described above, input the connection order data when the LAN operation starts, and confirm the position of the newly connected or separated station on the loop every time the connection order of the station connected to the transmission line changes. However, it was necessary to rewrite the connection order data of each station. However, with the advancement of LANs, many networks have been used in various places, and the number of stations that make up one network has increased, and for the convenience of operation, the connection and disconnection of stations has also been compared. Since it often happens frequently, the effort required for updating has become a non-negligible factor in network operation. Furthermore, according to the conventional method, even if there is an error in the connection order data, there is a drawback that it is difficult to find out immediately.
【０００５】伝送路の異常についても、伝送路の不完全
な接続状態に原因するような異常は伝送失敗の頻度が増
加する程度の不具合に止まるので発見が見過ごされる場
合があり、伝送異常が検出された場合においても、異常
箇所を特定するために前述した、分割された単一区間毎
の切り離しによる特定方法によっているので、異常箇所
の特定に手間がかかり過ぎる欠点があった。Regarding the abnormality of the transmission line, the abnormality due to the incomplete connection state of the transmission line may be overlooked because it may be overlooked because the frequency of transmission failure increases. Even in such a case, since the above-described specifying method by separating each of the divided single sections is used to specify the abnormal portion, there is a drawback that it takes too much time to specify the abnormal portion.
【０００６】上述の事情に鑑み、本発明は、ループ状の
伝送路に接続された各局の伝送路上の位置を容易に検知
し、現場での確認を不要とする方法を提供することを目
的とする。また、本発明は、伝送路の伝送状態が伝送不
能になる前の不完全な伝送状態の段階で異常箇所を特定
する方法を提供することを目的とする。In view of the above circumstances, it is an object of the present invention to provide a method for easily detecting the position on the transmission line of each station connected to a loop-shaped transmission line and eliminating the need for on-site confirmation. To do. It is another object of the present invention to provide a method for identifying an abnormal point at the stage of an incomplete transmission state before the transmission state of the transmission line becomes untransmittable.
【０００７】[0007]
【課題を解決するための手段】前述の目的を達成するた
め、請求項１の発明の方法によれば、下手、即ち送信方
向と上手、即ち受信方向とが一定の一つのループ状の伝
送路を介して接続された複数個の、それぞれ送信手段と
受信手段とを有するする局からなるループ状ネットワー
クにおいて、それぞれの局には自局がデータを送信しな
い状態の場合は伝送路の上手からのデータを受信させる
とともに該データを中継して下手に送信させ、自局がデ
ータを送信する状態の場合は伝送路の上手からのデータ
は受信させるのみで中継させないようにループ状ネット
ワークを構成し、任意に選定した基準位置の局を送信の
状態にし、次いで基準位置局以外の全ての局に予め定め
られた形式の応答フレームを順次送信させて、該応答フ
レームの受信の有無を応答フレーム送信中以外の局に記
録させ、該記録結果から伝送路上における各局の接続順
序を特定する。In order to achieve the above-mentioned object, according to the method of the present invention as defined in claim 1, one loop-shaped transmission line in which the lower direction, that is, the transmitting direction and the better direction, that is, the receiving direction are constant is provided. In a loop network consisting of a plurality of stations each having a transmitting means and a receiving means connected via a network, if the station does not transmit data to each station, the In addition to receiving data and relaying the data and sending it poorly, when the local station is in a state of sending data, configure a loop network so as to only receive data from the upper side of the transmission path and not relay it, The station at the arbitrarily selected reference position is set to the transmission state, and then all stations other than the reference position station are made to sequentially transmit the response frames of a predetermined format, and reception of the response frame is enabled. Was recorded in a station other than in the response frame transmission, identifies each station connection order on the transmission path from the printed result.
【０００８】また請求項２の発明においては、下手、即
ち送信方向と上手、即ち受信方向とが一定の一つのルー
プ状の伝送路を介して接続された複数個の、それぞれ送
信手段と受信手段とを有するする局からなるループ状ネ
ットワークにおいて、それぞれの局には自局がデータを
送信しない状態の場合は伝送路の上手からのデータを受
信させるとともに該データを中継して下手に送信させ、
自局がデータを送信する状態の場合は伝送路の上手から
のデータは受信させるのみで中継させないようにループ
状ネットワークを構成し、それぞれの局に受信データの
うち伝送上の異常が発見されたデータの個数を記録さ
せ、該記録回数から伝送路の異常区間を特定する。According to the second aspect of the invention, a plurality of transmitting means and a plurality of receiving means are respectively connected via one loop-shaped transmission line in which the lower side, that is, the transmitting direction and the upper side, that is, the receiving direction are fixed. In a loop network consisting of stations having and, in the case where each station does not transmit data, each station receives data from the upper side of the transmission path and relays the data and transmits it poorly,
When the local station is in the state of transmitting data, a loop network is configured so that the data from the upper hand of the transmission path is only received but not relayed, and an abnormality in the transmission of the received data was found at each station. The number of data is recorded, and the abnormal section of the transmission path is specified from the number of times of recording.
【０００９】[0009]
【作用】請求項１に記載の発明の方法においては、上述
のとおりにループ状ネットワークを構成するので、伝送
路上基準位置局の下手に最も近い位置にある局では、他
局から送信される応答フレームを、基準位置局が送信状
態にあるためにこの局で止められ、受信することができ
ない。基準位置局の下手に２番目に近い位置にある局
は、基準位置局の下手に最も近い位置にある局から送信
される応答フレームのみを受信することができる。以
下、基準位置局の下手に数えて離れた順番にある局程、
受信できる応答フレームの数が１づつ増大するので、基
準位置局を送信状態にしておき基準位置局以外の全ての
局に順次所定形式の応答フレームを送信させて、そのフ
レームの受信の有無を各局に記録させれば、全ての局の
応答フレームの送信が終わった段階での応答フレームの
受信回数を示す数値が、基準位置局を起点とするループ
状伝送路上での各局の接続順序を表す。In the method of the present invention as set forth in claim 1, since the loop network is configured as described above, the station closest to the lower side of the reference position station on the transmission path responds from another station. The frame cannot be received because the reference location station is blocked at this station because it is in a transmitting state. The station that is the second closest to the lower position of the reference position station can receive only the response frame transmitted from the station that is the closest to the lower position of the reference position station. Below, the stations in the order of distance from the reference position station,
Since the number of response frames that can be received increases by 1, the reference position station is set in the transmission state, and all stations other than the reference position station are made to sequentially send response frames of a predetermined format, and whether or not the frame has been received is determined by each station. If recorded, the numerical value indicating the number of response frame receptions at the stage when the transmission of the response frames of all the stations is completed represents the connection order of each station on the loop transmission path starting from the reference position station.
【００１０】請求項２に記載の発明の方法によれば、前
述のとおりにループ状ネットワークを構成するので、ル
ープ状伝送路の一区間の異常箇所が原因で、ある頻度で
伝送異常が発生すると、その区間から見て上手に最も近
い場所にある局では他局から送信されるデータはその異
常区間を経由せずに到達するので異常区間の影響をうけ
ない。一方異常区間の下手に最も近い場所にある局では
必ず異常区間を経て他局から送信されるデータを受信す
るので最も異常区間の影響をうける。異常区間から局一
つ分だけ離れた場所にある局では、この局から上手にあ
る局一つ分のデータが異常区間を経由せず、異常区間の
影響を受けない。この様にして、異常区間から下手に遠
い接続順位にある局程異常区間の影響を受けなくなる。
従って、各局においては、伝送異常を検出したデータの
受信回数を記録しているので、各局において記録されて
た伝送異常データの出現回数を比較することにより、伝
送異常データの出現回数が最大の局と最小の局の間の区
間に異常があることが推定できる。According to the method of the invention described in claim 2, since the loop-shaped network is configured as described above, when the abnormal portion of one section of the loop-shaped transmission line causes a transmission abnormality at a certain frequency. , The station closest to the section as seen from that section is not affected by the abnormal section because the data transmitted from other stations arrives without passing through the abnormal section. On the other hand, the station closest to the lower side of the abnormal section always receives the data transmitted from other stations via the abnormal section, and is therefore most affected by the abnormal section. In a station located one station away from the abnormal section, data for one station that is good at this station does not pass through the abnormal section and is not affected by the abnormal section. In this way, stations with connection ranks far from the abnormal section are less affected by the abnormal section.
Therefore, since each station records the number of times of reception of the data in which the transmission abnormality is detected, by comparing the number of occurrences of the transmission abnormality data recorded in each station, the station with the maximum number of occurrences of the transmission abnormality data is recorded. It can be estimated that there is an anomaly in the section between the minimum station and the station.
【００１１】[0011]
（実施例１）図１に本発明の方法を適用したループ状ネ
ットワークの一実施例を示す。図において、１はループ
状伝送路、2i(iは２桁目の数値、１〜５）は伝送路１に
接続された＃ｉ局（ｉは番号を表す数１〜５）であり、
各局は、データの送受信に関しては同一の構造と機能と
を有する。(Embodiment 1) FIG. 1 shows an embodiment of a loop network to which the method of the present invention is applied. In the figure, 1 is a loop-shaped transmission line, 2i (i is a numerical value in the second digit, 1 to 5) is a #i station (i is a number 1 to 5 representing a number) connected to the transmission line 1,
Each station has the same structure and function with respect to transmission and reception of data.
【００１２】図１の(b) は一つの局、＃ｉ局2iの内部を
表すブロック図である。図において2iは＃１局21〜＃５
局25を代表する一つの局、３は入出力制御部、４は送受
信の管理や演算を行う制御演算部、５は送受信データや
演算結果を格納する記憶部、６は記憶部に格納されてい
るデータを制御演算部からの制御によって入出力制御部
３を介して送信する送信制御部、７は入出力制御部３を
介して入力したデータを制御演算部からの制御によって
記憶部に格納する受信制御部である。FIG. 1B is a block diagram showing the inside of one station, #i station 2i. In the figure, 2i is # 1 station 21 to # 5
One station representing the station 25, 3 is an input / output control section, 4 is a control operation section for managing transmission / reception and operation, 5 is a storage section for storing transmission / reception data and operation results, and 6 is a storage section. A transmission control unit that transmits the stored data via the input / output control unit 3 under the control of the control calculation unit, and 7 stores the data input via the input / output control unit 3 in the storage unit under the control of the control calculation unit. It is a reception control unit.
【００１３】入出力制御部３は送信制御部６および受信
制御部７と伝送路１との間のデータの入出力を切り換え
る回路部分であり、図１においてスイッチの図記号で示
されるａの状態（送信状態ａ）に切り換えられている場
合は、送信制御部からのデータを下手（送信方向）に送
信するとともに、下手（受信方向）からのデータは受信
制御部７を介して記憶部５に記録し、内部での処理に可
能にするのみで下手への中継はしない。スイッチの図記
号で示されるｂの状態（受信状態ｂ）に切り換えられて
いる場合は、上手からのデータを受信し受信制御部７を
介して記憶部５に記録し内部での処理可能にすると同時
に受信したデータを下手に中継する。The input / output control unit 3 is a circuit portion for switching the input / output of data between the transmission control unit 6 and the reception control unit 7 and the transmission line 1. In FIG. 1, the state of a indicated by a symbol of the switch is shown. When the transmission mode is switched to (transmission state a), the data from the transmission control unit is transmitted to the storage unit 5 via the reception control unit 7 while the data from the transmission unit is transmitted to the storage unit 5 via the reception control unit 7. It records it and makes it available for internal processing, but does not relay it to the poor. When the state is changed to the state b (reception state b) indicated by the symbol of the switch, it is assumed that data from a good hand is received and recorded in the storage unit 5 via the reception control unit 7 so that it can be processed internally. At the same time, it relays the received data poorly.
【００１４】図１の(a) により伝送路１に接続する各局
の接続順序を検知する方法を、＃３局23を伝送路上の基
準位置局として選定した場合を例として説明する。基準
位置局として選定された＃３局23は入出力制御部を送信
状態ａにし、図２に示す形式の接続位置確認フレームを
送信する。図２においてFPは伝送フレームの一般的な形
式を表し、接続位置確認フレームと接続位置確認フレー
ムに対する応答フレームもこの形式による。伝送フレー
ムは符号DA,SA,CF,D,FCSで示される複数のビットから構
成され、DAはこのフレームを送信する相手先の局番を表
す送信先局番、SAはフレームを送信した局の局番を表す
送信元局番、CFはこのフレームの種類、例えば接続位置
確認フレーム、応答フレームや一般データを表すコード
等の制御部であり、D はこのフレームの本体に当たるデ
ータ、FCS はフレームの正否を検査するための検査用ビ
ットからなるフレーム検査部である。A method of detecting the connection order of the stations connected to the transmission line 1 will be described with reference to FIG. 1A by taking the case where the # 3 station 23 is selected as a reference position station on the transmission line as an example. The # 3 station 23 selected as the reference position station sets the input / output control unit to the transmission state a and transmits the connection position confirmation frame of the format shown in FIG. In FIG. 2, FP represents a general format of a transmission frame, and a connection position confirmation frame and a response frame to the connection position confirmation frame also have this format. A transmission frame is composed of multiple bits indicated by the codes DA, SA, CF, D, and FCS. DA is the destination station number that represents the station number of the other party that sends this frame, and SA is the station number of the station that sent the frame. Representing source station number, CF is the control part of this frame type, such as connection position confirmation frame, response frame and code representing general data, D is the data corresponding to the main body of this frame, FCS is to check the correctness of the frame The frame inspection unit is composed of inspection bits for
【００１５】再び図１の(a) において、＃３局23が最初
に送信した接続位置確認フレームが＃１局宛のフレーム
であったとする。このフレームは＃３局23より下手にあ
る全局即ち＃３局を除く全ての局によって受信され、そ
れぞれの局の記憶部に記録される。＃１局はこのフレー
ムが自局宛のものであることが、このフレームの送信先
局番DAから分かるので、この接続位置確認フレームに対
する応答フレームの送信をする。＃１局21が送信する応
答フレーむは、＃１局21より下手にある全局、即ち＃１
局21を除く全局において受信され各局の記憶部に＃１局
21からの応答フレームとして記録される。次いで、＃３
局23は、＃１局21からの応答フレームの受信が完了する
と、＃２局22へ接続位置確認フレームを送信する。この
場合は、図から明らかなとおり、接続位置確認フレーム
は全局で受信され、＃２局22からの応答フレームは、＃
３局が送信状態ａにあり中継されないので＃３局23に到
達するのみで他の局には到達しない。以上に説明の様に
して、＃３局は以下＃４局24、＃５局25までの接続位置
確認フレームを順次送信し、これらのフレームに対する
それぞれの局からの応答フレームを受信した各局におい
て記憶部に記録させる。In FIG. 1A again, it is assumed that the connection position confirmation frame first transmitted by the # 3 station 23 is a frame addressed to the # 1 station. This frame is received by all stations below the # 3 station 23, that is, all stations except the # 3 station, and recorded in the storage unit of each station. Station # 1 knows that this frame is addressed to itself, from the destination station number DA of this frame, and therefore transmits a response frame to this connection position confirmation frame. The response frame transmitted from # 1 station 21 is all stations below # 1 station 21, that is, # 1
Received by all stations except station 21, # 1 station in the memory of each station
Recorded as a response frame from 21. Then # 3
Upon completion of receiving the response frame from the # 1 station 21, the station 23 transmits a connection position confirmation frame to the # 2 station 22. In this case, as is clear from the figure, the connection position confirmation frame is received by all stations, and the response frame from the # 2 station 22 is
Since the three stations are in the transmission state a and are not relayed, only the # 3 station 23 is reached and other stations are not reached. As described above, the # 3 station sequentially transmits connection position confirmation frames up to the # 4 station 24 and the # 5 station 25, and stores the response frames from these stations in each station. Have the department record it.
【００１６】図３は各局の記憶部内に設けられた、接続
位置確認フレームに対する応答フレームの受信の有無を
記録する記憶領域の様式を示す。図においてDi（ｉは番
号）は＃ｉ局2i（ｉは局番とその局を表す符号の２桁
目）からの応答信号の有無を記録する為の領域で、各局
において接続位置確認フレームを受信し、そのフレーム
が局番ｉに対するものであることがフレームの送信先局
番DA（図２参照）から認識されるので、このフレームに
続いて受信されるべき応答フレームを待ち、応答フレー
ムが受信される場合は領域Diに１を、応答フレームが受
信されない場合は０を記録する。FIG. 3 shows a format of a storage area, which is provided in the storage unit of each station, for recording the presence / absence of a response frame to the connection position confirmation frame. In the figure, Di (i is a number) is an area for recording the presence or absence of a response signal from the #i station 2i (i is the station number and the second digit of the code representing the station). Each station receives the connection position confirmation frame. However, since it is recognized from the destination station number DA (see FIG. 2) of the frame that the frame is for the station number i, a response frame to be received subsequent to this frame is waited for, and the response frame is received. In the case, 1 is recorded in the area Di, and in the case where the response frame is not received, 0 is recorded.
【００１７】上述のとおりにして＃３局23を基準位置局
とし、＃３局23から各局毎に送信された接続位置確認フ
レームに対する応答フレームの、全局の送信が終了した
段階での、各局の応答フレームの有無を表１にまとめて
示す。As described above, the # 3 station 23 is used as a reference position station, and the response frame to the connection position confirmation frame transmitted from the # 3 station 23 for each station is transmitted by all stations at the stage when the transmission of all the stations is completed. The presence or absence of the response frame is summarized in Table 1.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表では左端の欄に応答フレームを送信した
局番が示され、最上欄に左欄に示されたた送信局からの
応答フレームの受信局が示されている。例えば表の２行
目の＃１局の行と縦の＃２，＃４，＃５局の欄の交点の
欄にはそれぞれ１が記入され、＃１局が送信した応答フ
レームは＃２，＃４，＃５局において受信さることが表
されている。最下欄は、この欄に対応する欄の最上欄に
記入されている局での応答フレームの受信数を表し、こ
の数値は図１の(a) の接続の場合の＃３局23を起点と
し、信号の流れの下流方向に数える各局の伝送路１への
接続順序に一致する。即ち＃３局21を起点とし、下流に
向かって＃１局21, ＃４局24, ＃５局25,＃２局22, の
順に各局が接続されていることを現している。In the table, the station number that transmitted the response frame is shown in the leftmost column, and the receiving station of the response frame from the transmitting station shown in the left column is shown in the uppermost column. For example, in the second row of the table, 1 is entered in each of the intersection fields of the # 1 station row and the vertical # 2, # 4, and # 5 stations, and the response frame transmitted by the # 1 station is # 2. It is shown that the data is received at the stations # 4 and # 5. The bottom column shows the number of received response frames at the station entered in the top column of the column corresponding to this column. This number starts from # 3 station 23 in the case of the connection in (a) of FIG. And the order of connection to the transmission line 1 of each station counted in the downstream direction of the signal flow is the same. That is, starting from the # 3 station 21, each station is connected in the order of # 1 station 21, # 4 station 24, # 5 station 25, # 2 station 22 in the downstream direction.
【００２０】＃３局23では、各局での応答フレームの受
信結果を伝送路１を経由して集め、表１に示すデータが
容易に得られるのでこのデータから各局の伝送路上の位
置を抽出し、監視装置に登録し監視用データとして使用
することができる。他の局においても＃３からのデータ
を受信することによってループ状ネットワーク全体の各
局の接続位置を知ることができる。 （実施例２）本例では、図１に示した実施例１のループ
状ネットワークと同一の構成とし、各局の記憶部１（図
１の(b) を参照）の内部に、受信データに伝送上の異常
が発見された回数を記録する異常回数積算領域を設け、
この領域に伝送上の異常発生回数を記録する。The # 3 station 23 collects the response frame reception results at each station via the transmission line 1 and the data shown in Table 1 can be easily obtained. Therefore, the position of each station on the transmission line is extracted from this data. , Can be registered in a monitoring device and used as monitoring data. Other stations can also know the connection position of each station of the entire loop network by receiving the data from # 3. (Embodiment 2) This embodiment has the same configuration as the loop network of Embodiment 1 shown in FIG. 1, and transmits received data inside the storage unit 1 (see (b) of FIG. 1) of each station. An abnormality count integration area is provided to record the number of times the above abnormality is found,
In this area, record the number of occurrences of abnormal transmission.
【００２１】各局間でのデータの伝送は、図２に示した
フレームFPの形式を用いて行なわれる。送信すべきデー
タはフレームFPの構成要素データD として他の送信先局
番DAなどの構成要素とともにフレームFPに組み込まれ、
構成要素の各ビットを総合したビットやデータD 単独で
の検査用ビットがフレーム検査部FCS に組み込まれて、
フレームFPの形式で送信される。この送信されたフレー
ムは、通常のデータ伝送の場合は送信する局は必ずルー
プ上の一つの局に限られるので必ずループ上の各局で受
信される。受信した各局においては、フレームが自局あ
てのものでない場合にも、フレーム検査部FCS と、他の
部分との照合を行い異常の有無の判定をし、異常があれ
ば異常回数積算領域に１を加算する。Data transmission between the stations is performed using the frame FP format shown in FIG. The data to be transmitted is incorporated into the frame FP as the component data D of the frame FP together with other components such as the destination station number DA.
Bits that combine each bit of the constituent elements and inspection bits for data D alone are incorporated in the frame inspection unit FCS,
Sent in frame FP format. In the case of normal data transmission, the transmitted frame is always limited to one station on the loop, so that the transmitted frame is always received by each station on the loop. Even if the frame is not addressed to itself, each receiving station checks the frame inspection unit FCS with other parts to determine whether there is an abnormality. Is added.
【００２２】図４に、図１の(a) に示す伝送路１の＃４
局24と＃５局25との間の伝送路に異常が発生し、この区
間を経由して伝送されるデータに伝送異常が時々発生す
る場合の各局での伝送異常の積算値の予想される分布を
示す。上述の異常区間は、＃５局25の上手に隣接する＃
４局24より近い位置にあるので、他局から送信され＃５
局に到達するデータは全て異常区間を経由することにな
り、この区間が原因する伝送異常は全て＃５局25におい
て記録される。＃２局22から見ると、異常区間は＃５局
25を間にした上手にあるので、＃５局25から送信される
データは異常区間を経ずに到達するが、＃５局25以外の
局からのデータは異常区間を経由して到達するので、異
常発生の回数は＃５局25から送信されるデータの分だけ
減少する。以下異常区間と受信端との間に入る局の数が
多い程異常データの受信頻度が減少し＃４局24で最小に
なる。FIG. 4 shows # 4 of the transmission line 1 shown in FIG.
If an abnormality occurs in the transmission line between the station 24 and # 5 station 25, and there is occasional transmission abnormality in the data transmitted via this section, it is expected to be the cumulative value of the transmission abnormality at each station. The distribution is shown. The above abnormal section is adjacent to # 5 station 25
Since it is closer to station 4 than station 24, it is sent from another station # 5
All data reaching the station will go through the abnormal section, and any transmission abnormality caused by this section will be recorded in the # 5 station 25. Looking from # 2 station 22, abnormal section is # 5 station
Since I am good at hitting 25, the data transmitted from # 5 station 25 arrives without passing through the abnormal section, but the data from stations other than # 5 station 25 arrives via the abnormal section. The number of occurrences of abnormality is reduced by the amount of data transmitted from the # 5 station 25. Below, as the number of stations entering between the abnormal section and the receiving end increases, the frequency of reception of abnormal data decreases, and the number of # 4 station 24 becomes the minimum.
【００２３】従って、各局において、同一時点を起点に
して周期的に異常データの積算を行い、積算値の更新を
行う都度それまでの各局における異常データの発生回数
の積算値の比較をすれば、伝送路に異常がある場合は、
各局の積算値間に図４に示した様な偏りが有るので、異
常の発生が初期の段階で発見できると同時に、異常箇所
がある区間の推定もできる。Therefore, at each station, abnormal data is periodically accumulated from the same point of time as a starting point, and each time the accumulated value is updated, the accumulated values of the number of times of occurrence of abnormal data at each station are compared. If there is something wrong with the transmission line,
Since there is a bias as shown in FIG. 4 between the integrated values of each station, the occurrence of an abnormality can be detected at an early stage, and at the same time, the section having the abnormality can be estimated.
【００２４】[0024]
【発明の効果】以上に説明したとおり、請求項１の発明
は、それぞれの局には自局がデータを送信しない状態の
場合は伝送路の上手からのデータを受信させるとともに
該データを中継して下手に送信させ、自局がデータを送
信する状態の場合は伝送路の上手からのデータは受信さ
せるのみで中継させないようにループ状ネットワークを
構成し、任意に選定した基準位置の局を送信の状態に
し、次いで基準位置局以外の全ての局に予め定められた
形式の応答フレームを順次送信させて、該応答フレーム
の受信の有無を伝送フレーム送信中以外の局に記録さ
せ、該記録結果から伝送路上における各局の接続順序を
特定することを特徴とするので、伝送フレームの伝送処
理のみで現場での確認作業をしなくても伝送路上の各局
の位置を知りうる効果がもたらされる。さらに理論的に
接続位置を示すデータに誤りが入る余地がないので、接
続位置データの信頼性が向上する効果がもたらされる。As described above, according to the first aspect of the invention, each station receives data from the upper side of the transmission line and relays the data when the station is in a state where it does not transmit data. If the local station is sending data, the loop network is configured so that it will only receive the data from the upper side of the transmission path but not relay it, and send the station at the arbitrarily selected reference position. Then, all the stations other than the reference position station are made to sequentially transmit the response frame of the predetermined format, and the presence or absence of the response frame is recorded in the stations other than the transmitting frame, and the recording result is recorded. Since it is characterized by specifying the connection order of each station on the transmission line from the above, it is possible to know the position of each station on the transmission line without performing on-site confirmation work only by transmission processing of transmission frames. It brought about. Furthermore, since there is theoretically no room for error in the data indicating the connection position, the reliability of the connection position data is improved.
【００２５】請求項２の発明は、それぞれ送信手段と受
信手段とを有するする局からなるループ状ネットワーク
において、それぞれの局には自局がデータを送信しない
状態の場合は伝送路の上手からのデータを受信させると
ともに該データを中継して下手に送信させ、自局がデー
タを送信する状態の場合は伝送路の上手からのデータは
受信させるのみで中継させないようにループ状ネットワ
ークを構成し、それぞれの局に受信データのうち伝送上
の異常が発見されたデータの個数を記録させ、該記録回
数から伝送路の異常区間を特定することを特徴とするの
で、定常的にデータの伝送異常発生回数を調べるのみで
伝送路上の異常の有無を検知し、しかも異常がある場合
は、異常区間が特定できる効果がもたらさもる。According to the invention of claim 2, in a loop network composed of stations each having a transmitting means and a receiving means, when the station does not transmit data to each station, the data is transmitted from the upper side of the transmission line. In addition to receiving data and relaying the data and sending it poorly, when the local station is in a state of sending data, configure a loop network so as to only receive data from the upper side of the transmission path and not relay it, It is characterized in that each station records the number of data in the received data in which an abnormality in transmission is found, and the abnormal section of the transmission path is specified from the number of recordings. The presence or absence of an abnormality on the transmission path can be detected only by checking the number of times, and if there is an abnormality, the effect of being able to specify the abnormal section is brought about.
【図１】請求項１に記載した発明の方法を適用したルー
プ状ネットワークの一実施例を示す図であって、(a) は
ループ状ネットワークの全体を示す図、(b) はループ状
ネットワークを構成する一つの局の内部を示すブロック
図FIG. 1 is a diagram showing an embodiment of a loop network to which the method of the invention described in claim 1 is applied, wherein (a) is a diagram showing the entire loop network, and (b) is a loop network. Block diagram showing the inside of one station that composes
【図２】請求項１に記載した発明の方法において使用さ
れる伝送フレームの一例を示す図FIG. 2 is a diagram showing an example of a transmission frame used in the method of the invention described in claim 1;
【図３】接続位置確認フレームに対する応答フレームの
有無を記録するための記憶部内の記憶領域を現す図FIG. 3 is a diagram showing a storage area in a storage unit for recording the presence or absence of a response frame for a connection position confirmation frame.
【図４】請求項２に記載のループ状ネットワークの状態
監視方法を適用した各局において、伝送路に異常が発生
した場合に各局において予想される異常データ発生回数
の積算値を模型的に表した図FIG. 4 is a model diagram showing an integrated value of the number of times of occurrence of abnormal data expected in each station when an abnormality occurs in a transmission line in each station to which the loop network state monitoring method according to claim 2 is applied. Figure
１ 伝送路 21〜25 ＃１局〜＃５局 ３ 入出力制御部 ４ 制御演算部 ５ 記憶部 ６ 送信制御部 ７ 受信制御部 1 Transmission line 21 to 25 # 1 station to # 5 station 3 Input / output control unit 4 Control calculation unit 5 Storage unit 6 Transmission control unit 7 Reception control unit
Claims (2)
とが一定の一つのループ状の伝送路を介して接続された
複数個の、それぞれ送信手段と受信手段とを有するする
局からなるループ状ネットワークにおいて、 それぞれの局には自局がデータを送信しない状態の場合
は伝送路の上手からのデータを受信させるとともに該デ
ータを中継して下手に送信させ、自局がデータを送信す
る状態の場合は伝送路の上手からのデータは受信させる
のみで中継させないようにループ状ネットワークを構成
し、 任意に選定した基準位置の局を送信の状態にし、次いで
基準位置局以外の全ての局に予め定められた形式の応答
フレームを順次送信させて、該応答フレームの受信の有
無を応答フレーム送信中以外の局に記録させ、該記録結
果から伝送路上における各局の接続順序を特定すること
を特徴とするループ状ネットワークの状態監視方法。1. A station having a plurality of transmitting means and a receiving means, respectively, which are connected via one loop-shaped transmission line in which the lower side, that is, the transmitting direction and the upper side, that is, the receiving direction are fixed. In a loop network, when each station is in a state where it does not transmit data, it receives data from the upper side of the transmission path, relays the data and transmits it poorly, and the local station transmits the data. In the state, the loop network is configured so that the data from the upper side of the transmission path is only received but not relayed, the station at the arbitrarily selected reference position is set to the transmission state, and then all stations other than the reference position station are set. In this case, response frames of a predetermined format are sequentially transmitted to each of the stations, and the presence / absence of reception of the response frame is recorded in a station other than the one in which the response frame is being transmitted. Condition monitoring method for a loop-like network, characterized by identifying each station connection order.
とが一定の一つのループ状の伝送路を介して接続された
複数個の、それぞれ送信手段と受信手段とを有するする
局からなるループ状ネットワークにおいて、 それぞれの局には自局がデータを送信しない状態の場合
は伝送路の上手からのデータを受信させるとともに該デ
ータを中継して下手に送信させ、自局がデータを送信す
る状態の場合は伝送路の上手からのデータは受信させる
のみで中継させないようにループ状ネットワークを構成
し、 それぞれの局に、該局にて受信したデータのうち伝送上
の異常が発見されたデータの個数を記録させ、該記録個
数から伝送路の異常区間を特定することを特徴とするル
ープ状ネットワークの状態監視方法。2. A station comprising a plurality of transmitting means and a receiving means, respectively, which are connected through one loop-shaped transmission line in which the lower side, that is, the transmitting direction and the upper side, that is, the receiving direction are fixed. In a loop network, when each station is in a state where it does not transmit data, it receives data from the upper side of the transmission path, relays the data and transmits it poorly, and the local station transmits the data. In the case of the status, the loop network is configured so that the data from the upper hand of the transmission path is only received but not relayed, and the data in which the transmission abnormality is found in the data received by each station Is recorded, and the abnormal section of the transmission path is specified from the recorded number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15315394A JP3144223B2 (en) | 1994-07-05 | 1994-07-05 | Monitoring method of loop network status |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15315394A JP3144223B2 (en) | 1994-07-05 | 1994-07-05 | Monitoring method of loop network status |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0818591A true JPH0818591A (en) | 1996-01-19 |
| JP3144223B2 JP3144223B2 (en) | 2001-03-12 |
Family
ID=15556190
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15315394A Expired - Fee Related JP3144223B2 (en) | 1994-07-05 | 1994-07-05 | Monitoring method of loop network status |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006245962A (en) * | 2005-03-02 | 2006-09-14 | Fuji Electric Systems Co Ltd | Information transmitter |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6072815B2 (en) * | 2012-10-24 | 2017-02-01 | 片山工業株式会社 | bicycle |
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1994
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006245962A (en) * | 2005-03-02 | 2006-09-14 | Fuji Electric Systems Co Ltd | Information transmitter |
| JP4543966B2 (en) * | 2005-03-02 | 2010-09-15 | 富士電機システムズ株式会社 | Information transmission equipment |
Also Published As
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|---|---|
| JP3144223B2 (en) | 2001-03-12 |
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