JP2002305525A - Communication diagnostic device - Google Patents
Communication diagnostic deviceInfo
- Publication number
- JP2002305525A JP2002305525A JP2001106301A JP2001106301A JP2002305525A JP 2002305525 A JP2002305525 A JP 2002305525A JP 2001106301 A JP2001106301 A JP 2001106301A JP 2001106301 A JP2001106301 A JP 2001106301A JP 2002305525 A JP2002305525 A JP 2002305525A
- Authority
- JP
- Japan
- Prior art keywords
- communication
- circuit
- communication station
- branch
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、伝送路を介して通
信局間で通信を行う通信システムの異常を検出する通信
診断装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication diagnostic apparatus for detecting an abnormality in a communication system for performing communication between communication stations via a transmission line.
【０００２】[0002]
【従来の技術】ネットワーク全体を繋ぐ幹線と、この幹
線と通信局とを繋ぐ枝分岐線とで構成される伝送路を介
して通信を行うネットワークシステムが知られている。
このネットワークシステムにおいて、複数の通信局は、
それぞれに接続された枝分岐線を介して幹線伝送路に接
続される。各通信局は、当該通信局に接続されている枝
分岐線および幹線を介して他の通信局との間で通信を行
う。このようなネットワークシステムで通信異常が発生
した場合の伝送路の故障部位を特定する技術として、た
とえば、特開２０００−３２４１４５号公報に開示され
る技術がある。この技術は、ネットワークシステムに通
信可否検出装置を取り付け、通信可否検出装置が各通信
局との間の通信の成立／不成立を順次検出する。通信可
否検出装置は、ネットワークシステム上の通信局のう
ち、どの通信局との間で通信できないかを調べることに
より、幹線の異常か、当該通信局に接続されている枝分
岐線の異常かを判別する。2. Description of the Related Art There is known a network system in which communication is performed via a transmission line including a trunk connecting the entire network and a branch line connecting the trunk and a communication station.
In this network system, a plurality of communication stations
It is connected to the main transmission line via the branch line connected to each. Each communication station communicates with another communication station via a branch line and a trunk line connected to the communication station. As a technique for specifying a failure portion of a transmission path when a communication error occurs in such a network system, for example, there is a technique disclosed in JP-A-2000-324145. In this technology, a communication availability detection device is attached to a network system, and the communication availability detection device sequentially detects establishment / non-establishment of communication with each communication station. The communication availability detection device checks whether the communication station cannot communicate with any of the communication stations on the network system, and thereby determines whether the trunk line is abnormal or the branch line connected to the communication station is abnormal. Determine.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述し
た通信可否検出装置では、通信できない通信局に接続さ
れている枝分岐線に異常があるのか、当該通信局自体に
異常があるのかを判別することができなかった。However, the above-mentioned communication availability detection apparatus determines whether there is an abnormality in a branch line connected to a communication station that cannot communicate or whether there is an abnormality in the communication station itself. Could not.
【０００４】本発明の目的は、通信局の異常と、この通
信局に接続されている伝送路の異常とを弁別する通信診
断装置を提供することにある。An object of the present invention is to provide a communication diagnostic apparatus for discriminating between an abnormality in a communication station and an abnormality in a transmission line connected to the communication station.
【０００５】[0005]
【課題を解決するための手段】（１）請求項１に記載の
発明は、２本の幹線と、幹線と通信局とを接続する２本
の枝分岐線とで構成される伝送路を介して通信局が通信
を行う通信システムの異常を検出する通信診断装置に適
用される。そして、通信局に備えられ、枝分岐線に接続
されて通信を行う通信手段と、通信局に備えられ、枝分
岐線間に接続される抵抗素子と、通信局に備えられ、通
信回路および抵抗素子のいずれか一方を枝分岐線間に択
一的に接続するように接続切替えを行う切替え手段と、
２本の幹線間の抵抗値を検出する抵抗値検出手段と、切
替え手段により抵抗素子が枝分岐線間に接続されている
とき、抵抗値検出手段で検出される抵抗値に応じて、枝
分岐線の異常か否かを判別する判別手段とを備えること
により、上述した目的を達成する。 （２）請求項２に記載の発明は、請求項１に記載の通信
診断装置において、判別手段は、抵抗値検出手段で検出
される抵抗値が所定値より大きいとき、枝分岐線の異常
と判別することを特徴とする。（３）請求項３に記載の
発明は、請求項１に記載の通信診断装置において、切替 え手段に対する切替え信号を伝送路を介して送信する送
信手段をさらに備え、通信手段は、切替え信号を受信す
ると、抵抗素子を枝分岐線間に接続するように切替え手
段に指示することを特徴とする。 （４）請求項４に記載の発明は、請求項３に記載の通信
診断装置において、通信局に備えられ、通信手段の異常
の有無を検出するとともに、異常を検出すると抵抗素子
を枝分岐線間に接続するように切替え手段に指示する制
御手段をさらに備えることを特徴とする。According to a first aspect of the present invention, there is provided a communication system comprising a transmission line composed of two trunk lines and two branch lines connecting the trunk line and a communication station. The present invention is applied to a communication diagnostic apparatus that detects an abnormality in a communication system in which a communication station performs communication. And a communication means provided in the communication station and connected to the branch line for performing communication, a resistance element provided in the communication station and connected between the branch lines, and a communication circuit and a resistance provided in the communication station. Switching means for performing connection switching so as to selectively connect one of the elements between the branch branch lines,
A resistance detecting means for detecting a resistance value between the two trunk lines; and a branching device according to the resistance value detected by the resistance value detecting means when the resistance element is connected between the branch lines by the switching means. The above-described object is achieved by providing a determination unit that determines whether the line is abnormal. (2) In the communication diagnostic apparatus according to the first aspect of the present invention, in the communication diagnostic apparatus according to the first aspect, when the resistance value detected by the resistance value detecting means is larger than a predetermined value, the determination unit may determine that the branch branch line is abnormal. It is characterized by determining. (3) The communication diagnostic apparatus according to the first aspect of the present invention is the communication diagnostic apparatus according to the first aspect, further comprising transmitting means for transmitting a switching signal to the switching means via a transmission line, wherein the communication means transmits the switching signal to the switching means. Upon receipt, the switching unit is instructed to connect the resistance element between the branch lines. (4) In the communication diagnostic apparatus according to the third aspect, in the communication diagnostic apparatus according to the third aspect, the communication station is provided to detect whether or not there is an abnormality in the communication means, and to connect the resistance element to the branch line when the abnormality is detected. It is characterized by further comprising control means for instructing the switching means to be connected between them.
【０００６】なお、上記課題を解決するための手段の項
では、本発明をわかりやすく説明するために実施の形態
の図と対応づけたが、これにより本発明が実施の形態に
限定されるものではない。In the section of the means for solving the above-mentioned problems, the present invention is associated with the drawings of the embodiments in order to explain the present invention in an easy-to-understand manner, but the present invention is not limited to the embodiments. is not.
【０００７】[0007]
【発明の効果】本発明によれば、次のような効果を奏す
る。すなわち、請求項１〜４に記載の発明では、２本の
幹線にそれぞれ２本の枝分岐線を介して通信局を接続
し、この通信局によって通信を行う通信システムで通信
診断を行うとき、通信局内で通信手段と抵抗器とを切替
えて抵抗器を枝分岐線間に接続し、２本の幹線間で検出
される抵抗値に応じて、枝分岐線の異常か否かを判別す
るようにした。したがって、枝分岐線に異常がない場合
は、抵抗器による抵抗値が検出され、枝分岐線に異常が
ある場合は、抵抗器による抵抗値が検出されない。この
結果、通信局で通信ができない場合に、当該通信局の異
常と、この通信局に接続されている枝分岐線の異常とを
判別することが可能になる。According to the present invention, the following effects can be obtained. That is, according to the first to fourth aspects of the present invention, when a communication station is connected to two trunk lines via two branch lines, and communication diagnosis is performed in a communication system in which communication is performed by the communication station, In the communication station, the communication means and the resistor are switched to connect the resistor between the branch lines, and it is determined whether or not the branch line is abnormal according to the resistance value detected between the two trunk lines. I made it. Therefore, when there is no abnormality in the branch line, the resistance value by the resistor is detected, and when there is abnormality in the branch line, the resistance value by the resistor is not detected. As a result, when communication cannot be performed at the communication station, it is possible to determine the abnormality of the communication station and the abnormality of the branch line connected to the communication station.
【０００８】[0008]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を説明する。 −第一の実施の形態− 図１は、本発明の第一の実施の形態による通信診断装置
を備えたネットワークシステムを示す図である。図１に
おいて、伝送路１０１と伝送路１０２とが幹線伝送路を
構成する。これら２本の伝送路１０１、１０２は、冗長
通信系を構成してもよく、２本の伝送路で電流伝播によ
る通信を行う単一通信系を構成してもよい。Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a diagram illustrating a network system including a communication diagnostic device according to a first embodiment of the present invention. In FIG. 1, a transmission line 101 and a transmission line 102 constitute a main transmission line. These two transmission lines 101 and 102 may constitute a redundant communication system, or may constitute a single communication system for performing communication by current propagation using the two transmission lines.
【０００９】幹線伝送路１０１および１０２には、複数
の通信局が接続されている。通信局１１０は、枝分岐線
１１１および１１２によって幹線伝送路１０１および１
０２に接続される。枝分岐線１１１は伝送路１０１に、
枝分岐線１１２は伝送路１０２にそれぞれ接続される。
通信局１１０は、通信回路１１３と、抵抗器１１４と、
切替え回路１１５とを有する。通信回路１１３は、切替
え回路１１５を介して枝分岐線１１１および１１２に接
続され、幹線伝送路１０１および１０２を介して他の通
信局との間で通信を行う。抵抗器１１４は、伝送路１０
１および１０２、枝分岐線１１１および１１２のインピ
ーダンスより十分大きな抵抗値Ｒを有し、切替え回路１
１５を介して枝分岐線１１１および１１２間に接続され
る。切替え回路１１５は、枝分岐線１１１および１１２
を、通信回路１１３あるいは抵抗器１１４に接続する。
接続切替えは、後述する診断器１６０から送信される切
替え信号によって行う。[0009] A plurality of communication stations are connected to the trunk transmission lines 101 and 102. The communication station 110 is connected to the trunk transmission lines 101 and 1 by branch lines 111 and 112.
02. The branch line 111 is connected to the transmission line 101,
The branch lines 112 are connected to the transmission line 102, respectively.
The communication station 110 includes a communication circuit 113, a resistor 114,
And a switching circuit 115. The communication circuit 113 is connected to the branch lines 111 and 112 via the switching circuit 115, and communicates with other communication stations via the trunk transmission lines 101 and 102. The resistor 114 is connected to the transmission line 10
1 and 102, the resistance value R is sufficiently larger than the impedance of the branch lines 111 and 112, and the switching circuit 1
15 is connected between the branch lines 111 and 112. The switching circuit 115 includes the branch lines 111 and 112.
Is connected to the communication circuit 113 or the resistor 114.
Connection switching is performed by a switching signal transmitted from a diagnostic device 160 described later.
【００１０】通信局１２０は、枝分岐線１２１および１
２２によって幹線伝送路１０１および１０２に接続され
る。枝分岐線１２１は伝送路１０１に、枝分岐線１２２
は伝送路１０２にそれぞれ接続される。通信局１２０
は、通信回路１２３と、抵抗器１２４と、切替え回路１
２５とを有する。通信回路１２３は、切替え回路１２５
を介して枝分岐線１２１および１２２に接続され、幹線
伝送路１０１および１０２を介して他の通信局との間で
通信を行う。抵抗器１２４は、伝送路１０１および１０
２、枝分岐線１２１および１２２のインピーダンスより
十分大きな抵抗値Ｒを有し、切替え回路１２５を介して
枝分岐線１２１および１２２間に接続される。切替え回
路１２５は、枝分岐線１２１および１２２を、通信回路
１２３あるいは抵抗器１２４に接続する。接続切替え
は、後述する診断器１６０から送信される切替え信号に
よって行う。The communication station 120 includes branch lines 121 and 1
22 is connected to the main transmission lines 101 and 102. The branch line 121 is connected to the transmission line 101 and the branch line 122
Are connected to the transmission path 102, respectively. Communication station 120
Is a communication circuit 123, a resistor 124, and a switching circuit 1
25. The communication circuit 123 includes a switching circuit 125
Is connected to the branch lines 121 and 122 via the main line and communicates with other communication stations via the main transmission lines 101 and 102. The resistor 124 is connected to the transmission lines 101 and 10
2. It has a resistance value R sufficiently larger than the impedance of the branch lines 121 and 122, and is connected between the branch lines 121 and 122 via the switching circuit 125. The switching circuit 125 connects the branch lines 121 and 122 to the communication circuit 123 or the resistor 124. Connection switching is performed by a switching signal transmitted from a diagnostic device 160 described later.
【００１１】通信局１３０は、枝分岐線１３１および１
３２によって幹線伝送路１０１および１０２に接続され
る。枝分岐線１３１は伝送路１０１に、枝分岐線１３２
は伝送路１０２にそれぞれ接続される。通信局１３０
は、通信回路１３３と、抵抗器１３４と、切替え回路１
３５とを有する。通信回路１３３は、切替え回路１３５
を介して枝分岐線１３１および１３２に接続され、幹線
伝送路１０１および１０２を介して他の通信局との間で
通信を行う。抵抗器１３４は、伝送路１０１および１０
２、枝分岐線１３１および１３２のインピーダンスより
十分大きな抵抗値Ｒを有し、切替え回路１３５を介して
枝分岐線１３１および１３２間に接続される。切替え回
路１３５は、枝分岐線１３１および１３２を、通信回路
１３３あるいは抵抗器１３４に接続する。接続切替え
は、後述する診断器１６０から送信される切替え信号に
よって行う。The communication station 130 includes branch lines 131 and 1
32 is connected to the main transmission lines 101 and 102. The branch line 131 is connected to the transmission line 101 by a branch line 132.
Are connected to the transmission path 102, respectively. Communication station 130
Is a communication circuit 133, a resistor 134, a switching circuit 1
35. The communication circuit 133 includes a switching circuit 135
, And communicates with other communication stations via the trunk transmission lines 101 and 102. The resistor 134 is connected to the transmission lines 101 and 10
2. It has a resistance value R sufficiently larger than the impedance of the branch lines 131 and 132, and is connected between the branch lines 131 and 132 via the switching circuit 135. The switching circuit 135 connects the branch lines 131 and 132 to the communication circuit 133 or the resistor 134. Connection switching is performed by a switching signal transmitted from a diagnostic device 160 described later.
【００１２】診断器１６０は、各通信局と同様に、枝分
岐線１６１および１６２によって幹線伝送路１０１およ
び１０２に接続される。枝分岐線１６１は伝送路１０１
に、枝分岐線１６２は伝送路１０２にそれぞれ接続され
る。診断器１６０は、制御回路１６７と、抵抗測定回路
１６８と、診断部１６９とを有する。制御回路１６７
は、各通信局の切替え回路のそれぞれに対して切替え信
号を送信する。切替え信号を送信する通信線１５０は、
上述した各伝送路および枝分岐線と別に設けられてい
る。抵抗測定回路１６８は、枝分岐線１６１および１６
２を介して、幹線伝送路１０１および１０２間の抵抗値
を検出する。診断部１６９は、抵抗測定回路１６８によ
って測定された抵抗値に応じて、各通信局自体の異常
か、当該通信局に接続された枝分岐線の異常かを判別す
る。The diagnostic device 160 is connected to the trunk transmission lines 101 and 102 by branch lines 161 and 162, similarly to each communication station. The branch line 161 is connected to the transmission line 101.
The branch line 162 is connected to the transmission line 102. The diagnostic device 160 includes a control circuit 167, a resistance measuring circuit 168, and a diagnostic unit 169. Control circuit 167
Transmits a switching signal to each switching circuit of each communication station. The communication line 150 that transmits the switching signal is
It is provided separately from the above-described transmission paths and branch lines. The resistance measuring circuit 168 includes the branch lines 161 and 16
2, a resistance value between the main transmission lines 101 and 102 is detected. The diagnosis unit 169 determines whether the communication station itself is abnormal or the branch line connected to the communication station is abnormal, according to the resistance value measured by the resistance measurement circuit 168.
【００１３】上述したネットワークシステムにおいて通
常の通信を行う時、診断器１６０の制御回路１６７は、
切替え回路１１５に信号を送り、通信回路１１３と枝分
岐線１１１および１１２とを接続させる。同様に、切替
え回路１２５に信号を送り、通信回路１２３と枝分岐線
１２１および１２２とを接続させる。さらに、切替え回
路１３５に信号を送り、通信回路１３３と枝分岐線１３
１および１３２とを接続させる。これにより、各通信局
と他の通信局との間で通信が行われる。When performing normal communication in the above-described network system, the control circuit 167 of the diagnostic device 160
A signal is sent to the switching circuit 115 to connect the communication circuit 113 to the branch lines 111 and 112. Similarly, a signal is sent to the switching circuit 125 to connect the communication circuit 123 to the branch lines 121 and 122. Further, a signal is sent to the switching circuit 135, and the communication circuit 133 and the branch line 13 are transmitted.
1 and 132 are connected. Thus, communication is performed between each communication station and another communication station.
【００１４】ネットワークシステムの異常時に通信局か
枝分岐線かを切り分け診断する時、診断器１６０の制御
回路１６７は、切替え回路１１５に信号を送り、抵抗器
１１４を枝分岐線１１１および１１２間に接続させる。
同様に、切替え回路１２５に信号を送り、抵抗器１２４
を枝分岐線１２１および１２２間に接続させる。さら
に、切替え回路１３５に信号を送り、抵抗器１３４を枝
分岐線１３１および１３２間に接続させる。診断部１６
９は、抵抗測定回路１６８で検出される抵抗値に応じ
て、通信局の異常か、当該通信局に接続される枝分岐線
の異常かを判別する。When the network system is abnormal, the control circuit 167 of the diagnostic device 160 sends a signal to the switching circuit 115 to connect the resistor 114 between the branch lines 111 and 112 when the communication station or the branch line is diagnosed. Connect.
Similarly, a signal is sent to the switching circuit 125 and the resistor 124
Is connected between the branch lines 121 and 122. Further, a signal is sent to the switching circuit 135 to connect the resistor 134 between the branch lines 131 and 132. Diagnosis unit 16
Numeral 9 determines whether the communication station is abnormal or the branch line connected to the communication station is abnormal according to the resistance value detected by the resistance measuring circuit 168.
【００１５】たとえば、通信局１２０が通信局１１０お
よび１３０のいずれとも通信できない場合、通信局１２
０自体に発生した異常と、枝分岐線１２１および１２２
の少なくとも一方に生じた異常とが考えられる。このと
き、診断部１６９は、抵抗測定回路１６８で検出される
抵抗値がＲ／３の場合に、枝分岐線１２１および１２２
の異常ではなく、通信局１２０の異常と判定する。全て
の枝分岐線に異常がなければ、３つの抵抗器が並列に接
続された場合の抵抗値が検出されるからである。一方、
抵抗測定回路１６８で検出される抵抗値がＲ／２の場合
に、通信局１２０の異常ではなく、枝分岐線１２１およ
び１２２の少なくとも一方の異常と判定する。枝分岐線
の異常は、たとえば断線である。枝分岐線１２１、１２
２が断線すると、２つの抵抗器が並列に接続された場合
の抵抗値が検出されるからである。ここで、通信局１２
０が通信局１１０および１３０のいずれとも通信できな
いことは、従来技術と同様の通信可否検出装置によって
診断されている。すなわち、不図示の通信可否検出装置
が幹線伝送路１０１および１０２に取り付けられ、この
通信可否検出装置が幹線伝送路１０１および１０２を介
して各通信局との間で通信の成立／不成立を順次検出す
ることにより、どの通信局との間で通信ができないかが
診断される。For example, if communication station 120 cannot communicate with either of communication stations 110 and 130, communication station 12
0 and the branch lines 121 and 122
Is considered to have occurred in at least one of the above. At this time, when the resistance value detected by the resistance measurement circuit 168 is R / 3, the diagnosis unit 169 determines that the branch lines 121 and 122
It is determined that the communication station 120 is not an error, but an error. If there is no abnormality in all the branch lines, the resistance value when three resistors are connected in parallel is detected. on the other hand,
When the resistance value detected by the resistance measurement circuit 168 is R / 2, it is determined that the communication station 120 is not abnormal and at least one of the branch lines 121 and 122 is abnormal. An abnormality of the branch line is, for example, a disconnection. Branch lines 121, 12
This is because, when 2 is disconnected, the resistance value when two resistors are connected in parallel is detected. Here, the communication station 12
The fact that 0 cannot communicate with either of the communication stations 110 and 130 has been diagnosed by a communication availability detector similar to the prior art. That is, a communication availability detection device (not shown) is attached to the trunk transmission lines 101 and 102, and the communication availability detection device sequentially detects establishment / non-establishment of communication with each communication station via the trunk transmission lines 101 and 102. By doing so, it is diagnosed with which communication station communication is not possible.
【００１６】図２は、以上説明したネットワークシステ
ムにおける処理手順の流れを説明するフローチャートで
ある。図２の処理は、診断器１６０の制御回路１６７に
よって行われる。ステップＳ１において、制御回路１６
７は、ネットワークシステムに通常の通信を行わせるか
否かを判定する。通信を行う場合はステップＳ１を肯定
判定してステップＳ２へ進み、通信を行わない場合はス
テップＳ１を否定判定してステップＳ５へ進む。ステッ
プＳ２において、制御回路１６７は、各通信局の通信回
路と当該通信局の枝分岐線とを接続し、ステップＳ３へ
進む。FIG. 2 is a flowchart for explaining the flow of the processing procedure in the network system described above. 2 is performed by the control circuit 167 of the diagnostic device 160. In step S1, the control circuit 16
7 determines whether or not to cause the network system to perform normal communication. If communication is to be performed, a positive determination is made in step S1 and the process proceeds to step S2. If communication is not performed, a negative determination is made to step S1 and the process proceeds to step S5. In step S2, the control circuit 167 connects the communication circuit of each communication station to the branch line of the communication station, and proceeds to step S3.
【００１７】ステップＳ３において、各通信局は所定の
通信動作を行う。ステップＳ４において、制御回路１６
７は、通信動作を終了させるか否かを判定する。通信動
作を継続する場合はステップＳ４を否定判定してステッ
プＳ３に戻り、通信動作を終了させる場合はステップＳ
４を肯定判定してステップＳ５へ進む。ステップＳ５に
おいて、制御回路１６７は、切り分け診断を行うか否か
を判定する。切り分け診断を行う場合はステップＳ５を
肯定判定してステップＳ６へ進み、切り分け診断を行わ
ない場合はステップＳ５を否定判定して図２の処理を終
了する。In step S3, each communication station performs a predetermined communication operation. In step S4, the control circuit 16
7 determines whether to end the communication operation. If the communication operation is to be continued, a negative determination is made in step S4, and the process returns to step S3.
4 is affirmatively determined, and the process proceeds to step S5. In step S5, the control circuit 167 determines whether or not to perform the isolation diagnosis. When performing the segmentation diagnosis, a positive determination is made in step S5, and the process proceeds to step S6. When the segmentation diagnosis is not performed, the process in FIG.
【００１８】ステップＳ６において、制御回路１６７
は、各通信局の抵抗器と当該通信局の枝分岐線とを接続
し、ステップＳ７へ進む。ステップＳ７において、制御
回路１６７は、抵抗測定回路１６８に幹線伝送路１０１
および１０２間の抵抗値を検出させる。ステップＳ８に
おいて、制御回路１６７は、診断器１６０の診断部１６
９に切り分け診断させて、図２の処理を終了する。In step S6, the control circuit 167
Connects the resistor of each communication station to the branch line of the communication station, and proceeds to step S7. In step S7, the control circuit 167 sends the resistance measurement circuit 168 the main transmission line 101
And the resistance value between 102 and 102 is detected. In step S8, the control circuit 167 sets the diagnostic unit 16
9, and the processing of FIG. 2 is terminated.
【００１９】以上説明した第一の実施の形態によれば、
次の作用効果が得られる。すなわち、幹線伝送路１０１
および１０２に２本の枝分岐線を介して接続される通信
局１１０、１２０、および１３０のそれぞれにおいて、
枝分岐線間に通信回路および抵抗器のうち一方を接続す
る切替え回路１１５、１２５、および１３５を設ける。
たとえば、通信局１２０の場合は、枝分岐線１２１およ
び１２２間に、通信回路１２３および抵抗器１２４のう
ち一方を接続する切替え回路１２５を設ける。通信でき
ない通信局が存在する場合に、診断器１６０によって当
該通信局自体の異常か、当該通信局の枝分岐線の異常か
を切り分け診断する時、診断器１６０は、通信局１１
０、１２０、および１３０の切替え回路１１５、１２
５、および１３５にそれぞれ切替え信号を送り、各枝分
岐線間に抵抗値Ｒの抵抗器１１４、１２４、および１３
４をそれぞれ接続させる。これにより、診断器１６０
は、幹線伝送路１０１および１０２間で検出される抵抗
値に応じて、通信できない通信局自体の異常か、当該通
信局の枝分岐線の異常かを切り分け診断することができ
る。According to the first embodiment described above,
The following effects can be obtained. That is, the trunk transmission line 101
In each of the communication stations 110, 120, and 130 connected to two
Switching circuits 115, 125, and 135 for connecting one of the communication circuit and the resistor are provided between the branch lines.
For example, in the case of the communication station 120, a switching circuit 125 for connecting one of the communication circuit 123 and the resistor 124 is provided between the branch lines 121 and 122. When there is a communication station that cannot communicate, the diagnostic device 160 determines whether the communication station itself is abnormal or the branch line of the communication station is abnormal by the diagnostic device 160.
Switching circuits 115, 12 for 0, 120, and 130
5 and 135, respectively, and the resistors 114, 124, and 13 having a resistance value R are provided between the branch branches.
4 respectively. Thereby, the diagnostic device 160
In accordance with the resistance value detected between the trunk transmission lines 101 and 102, it is possible to separately diagnose whether the communication station itself cannot communicate or the branch line of the communication station is abnormal.
【００２０】−第二の実施の形態− 図３を参照して第二の実施の形態を説明する。図３は、
本発明の第二の実施の形態による通信診断装置を備えた
ネットワークシステムを示す図である。図３において、
伝送路２０１と伝送路２０２とが幹線伝送路を構成す
る。これら２本の伝送路２０１および２０２は、冗長通
信系を構成してもよく、２本の伝送路で電流伝播による
通信を行う単一通信系を構成してもよい。-Second Embodiment- A second embodiment will be described with reference to FIG. FIG.
It is a figure showing a network system provided with a communication diagnostic device by a 2nd embodiment of the present invention. In FIG.
The transmission line 201 and the transmission line 202 constitute a trunk transmission line. These two transmission lines 201 and 202 may constitute a redundant communication system, or may constitute a single communication system for performing communication by current propagation using the two transmission lines.
【００２１】幹線伝送路２０１および２０２には、複数
の通信局が接続されている。通信局２１０は、枝分岐線
２１１および２１２によって幹線伝送路２０１および２
０２に接続される。枝分岐線２１１は伝送路２０１に、
枝分岐線２１２は伝送路２０２にそれぞれ接続される。
通信局２１０は、通信回路２１３と、抵抗器２１４と、
切替え回路２１５と、異常検出回路２１６とを有する。
通信回路２１３は、切替え回路２１５を介して枝分岐線
２１１および２１２に接続され、幹線伝送路２０１およ
び２０２を介して他の通信局との間で通信を行う。通信
回路２１３はさらに、後述する診断器２６０との間で通
信を行い、診断器２６０から制御信号を受信すると、切
替え回路２１５に切替え信号を送る。A plurality of communication stations are connected to the trunk transmission lines 201 and 202. The communication station 210 is connected to the trunk transmission lines 201 and 2 by the branch lines 211 and 212.
02. The branch line 211 is connected to the transmission line 201,
The branch lines 212 are connected to the transmission path 202, respectively.
The communication station 210 includes a communication circuit 213, a resistor 214,
It has a switching circuit 215 and an abnormality detection circuit 216.
The communication circuit 213 is connected to the branch lines 211 and 212 via the switching circuit 215, and communicates with other communication stations via the trunk transmission lines 201 and 202. The communication circuit 213 further communicates with a diagnostic device 260 described later, and when receiving a control signal from the diagnostic device 260, sends a switching signal to the switching circuit 215.
【００２２】抵抗器２１４は、伝送路２０１および２０
２、枝分岐線２１１および２１２のインピーダンスより
十分大きな抵抗値Ｒを有し、切替え回路２１５を介して
枝分岐線２１１および２１２間に接続される。切替え回
路２１５は、通信局２１０の電源オン時に、枝分岐線２
１１および２１２を通信回路２１３に接続する。また、
切替え回路２１５は、通信回路２１３、および異常検出
回路２１６から送信される切替え信号により、枝分岐線
２１１および２１２を抵抗器２１４に接続する。異常検
出回路２１６は、通信回路２１３内の不図示のメモリを
チェックしたり、通信回路２１３による他の通信局との
間の送信の成立／不成立を監視することにより、通信回
路２１３の異常の有無を検出する。異常検出回路２１６
は、通信回路２１３の異常を検出すると、切替え回路２
１５に切替え信号を送る。The resistor 214 is connected to the transmission lines 201 and 20
2. It has a resistance value R sufficiently larger than the impedance of the branch lines 211 and 212, and is connected between the branch lines 211 and 212 via a switching circuit 215. The switching circuit 215 operates when the power of the communication station 210 is turned on.
11 and 212 are connected to the communication circuit 213. Also,
The switching circuit 215 connects the branch lines 211 and 212 to the resistor 214 based on the switching signal transmitted from the communication circuit 213 and the abnormality detection circuit 216. The abnormality detection circuit 216 checks the memory (not shown) in the communication circuit 213, and monitors whether or not the communication circuit 213 has performed transmission with another communication station to determine whether or not the communication circuit 213 has an abnormality. Is detected. Abnormality detection circuit 216
Detects the abnormality of the communication circuit 213,
A switching signal is sent to 15.
【００２３】通信局２２０は、枝分岐線２２１および２
２２によって幹線伝送路２０１および２０２に接続され
る。枝分岐線２２１は伝送路２０１に、枝分岐線２２２
は伝送路２０２にそれぞれ接続される。通信局２２０
は、通信回路２２３と、抵抗器２２４と、切替え回路２
２５と、異常検出回路２２６とを有する。通信回路２２
３は、切替え回路２２５を介して枝分岐線２２１および
２２２に接続され、幹線伝送路２０１および２０２を介
して他の通信局との間で通信を行う。通信回路２２３は
さらに、後述する診断器２６０との間で通信を行い、診
断器２６０から制御信号を受信すると、切替え回路２２
５に切替え信号を送る。The communication station 220 has branch lines 221 and 2
22 is connected to the trunk transmission lines 201 and 202. The branch line 221 is connected to the transmission line 201 by a branch line 222.
Are connected to the transmission path 202, respectively. Communication station 220
Is a communication circuit 223, a resistor 224, and a switching circuit 2
25 and an abnormality detection circuit 226. Communication circuit 22
3 is connected to the branch lines 221 and 222 via the switching circuit 225 and communicates with other communication stations via the trunk transmission lines 201 and 202. The communication circuit 223 further communicates with a diagnostic device 260 to be described later, and when a control signal is received from the diagnostic device 260, the switching circuit 22
5 is sent a switching signal.
【００２４】抵抗器２２４は、伝送路２０１および２０
２、枝分岐線２２１および２２２のインピーダンスより
十分大きな抵抗値Ｒを有し、切替え回路２２５を介して
枝分岐線２２１および２２２間に接続される。切替え回
路２２５は、通信局２２０の電源オン時に、枝分岐線２
２１および２２２を通信回路２２３に接続する。また、
切替え回路２２５は、通信回路２２３、および異常検出
回路２２６から送信される切替え信号により、枝分岐線
２２１および２２２を抵抗器２２４に接続する。異常検
出回路２２６は、通信回路２２３内の不図示のメモリを
チェックしたり、通信回路２２３による他の通信局との
間の送信の成立／不成立を監視することにより、通信回
路２２３の異常の有無を検出する。異常検出回路２２６
は、通信回路２２３の異常を検出すると、切替え回路２
２５に切替え信号を送る。The resistor 224 is connected to the transmission lines 201 and 20.
2. It has a resistance value R sufficiently larger than the impedance of the branch lines 221 and 222, and is connected between the branch lines 221 and 222 via the switching circuit 225. The switching circuit 225 operates when the communication station 220 is powered on.
21 and 222 are connected to a communication circuit 223. Also,
The switching circuit 225 connects the branch lines 221 and 222 to the resistor 224 according to the switching signal transmitted from the communication circuit 223 and the abnormality detection circuit 226. The abnormality detection circuit 226 checks the memory (not shown) in the communication circuit 223 and monitors whether or not the communication circuit 223 has performed transmission with another communication station to determine whether or not the communication circuit 223 has an abnormality. Is detected. Abnormality detection circuit 226
Detects the abnormality of the communication circuit 223,
25, a switching signal is sent.
【００２５】通信局２３０は、枝分岐線２３１および２
３２によって幹線伝送路２０１および２０２に接続され
る。枝分岐線２３１は伝送路２０１に、枝分岐線２３２
は伝送路２０２にそれぞれ接続される。通信局２３０
は、通信回路２３３と、抵抗器２３４と、切替え回路２
３５と、異常検出回路２３６とを有する。通信回路２３
３は、切替え回路２３５を介して枝分岐線２３１および
２３２に接続され、幹線伝送路２０１および２０２を介
して他の通信局との間で通信を行う。通信回路２３３は
さらに、後述する診断器２６０との間で通信を行い、診
断器２６０から制御信号を受信すると、切替え回路２３
５に切替え信号を送る。The communication station 230 has branch lines 231 and 2
32 is connected to the trunk transmission lines 201 and 202. The branch line 231 is connected to the transmission line 201 by a branch line 232.
Are connected to the transmission path 202, respectively. Communication station 230
Is a communication circuit 233, a resistor 234, a switching circuit 2
35 and an abnormality detection circuit 236. Communication circuit 23
3 is connected to the branch lines 231 and 232 via the switching circuit 235, and communicates with other communication stations via the trunk transmission lines 201 and 202. The communication circuit 233 further communicates with a diagnostic device 260 described later, and when a control signal is received from the diagnostic device 260, the switching circuit 23
5 is sent a switching signal.
【００２６】抵抗器２３４は、伝送路２０１および２０
２、枝分岐線２３１および２３２のインピーダンスより
十分大きな抵抗値Ｒを有し、切替え回路２３５を介して
枝分岐線２３１および２３２間に接続される。切替え回
路２３５は、通信局２３０の電源オン時に、枝分岐線２
３１および２３２を通信回路２３３に接続する。また、
切替え回路２３５は、通信回路２３３、および異常検出
回路２３６から送信される切替え信号により、枝分岐線
２３１および２３２を抵抗器２３４に接続する。異常検
出回路２３６は、通信回路２３３内の不図示のメモリを
チェックしたり、通信回路２３３による他の通信局との
間の送信の成立／不成立を監視することにより、通信回
路２３３の異常の有無を検出する。異常検出回路２３６
は、通信回路２３３の異常を検出すると、切替え回路２
３５に切替え信号を送る。The resistor 234 is connected to the transmission lines 201 and 20.
2. It has a resistance value R sufficiently larger than the impedance of the branch lines 231 and 232, and is connected between the branch lines 231 and 232 via a switching circuit 235. The switching circuit 235 operates when the power of the communication station 230 is turned on.
31 and 232 are connected to a communication circuit 233. Also,
The switching circuit 235 connects the branch lines 231 and 232 to the resistor 234 according to the switching signal transmitted from the communication circuit 233 and the abnormality detection circuit 236. The abnormality detection circuit 236 checks the memory (not shown) in the communication circuit 233 and monitors whether or not the communication circuit 233 has performed transmission with another communication station to determine whether or not the communication circuit 233 has an abnormality. Is detected. Abnormality detection circuit 236
Detects the abnormality of the communication circuit 233,
A switching signal is sent to 35.
【００２７】診断器２６０は、各通信局と同様に、枝分
岐線２６１および２６２によって幹線伝送路２０１およ
び２０２に接続される。枝分岐線２６１は伝送路２０１
に、枝分岐線２６２は伝送路２０２にそれぞれ接続され
る。診断器２６０は、通信回路２６３と、異常検出回路
２６６と、制御回路２６７と、抵抗測定回路２６８と、
診断部２６９とを有する。The diagnostic device 260 is connected to the trunk transmission lines 201 and 202 by branch lines 261 and 262 as in each communication station. The branch line 261 is connected to the transmission line 201.
The branch line 262 is connected to the transmission path 202. The diagnostic device 260 includes a communication circuit 263, an abnormality detection circuit 266, a control circuit 267, a resistance measurement circuit 268,
A diagnosis unit 269.
【００２８】通信回路２６３は枝分岐線２６１および２
６２に接続され、制御回路２６７から出力される制御信
号を、幹線伝送路２０１および２０２を介して各通信局
の通信回路２１３、２２３、および２３３に送る。異常
検出回路２６６は、通信回路２６３内の不図示のメモリ
をチェックしたり、通信回路２６３による他の通信局と
の間の送信の成立／不成立を監視することにより、通信
回路２６３の異常の有無を検出する。制御回路２６７
は、各通信局に対する制御信号、すなわち、各通信局の
切替え回路に対する切替え指令をのせた信号を出力す
る。抵抗測定回路２６８は、枝分岐線２６１および２６
２を介して、幹線伝送路２０１および２０２間の抵抗値
を検出する。診断部２６９は、抵抗測定回路２６８によ
って測定された抵抗値に応じて、各通信局の異常か、当
該通信局に接続された枝分岐線の異常かを判別する。The communication circuit 263 includes branch lines 261 and 2
62, and sends a control signal output from the control circuit 267 to the communication circuits 213, 223, and 233 of each communication station via the main transmission lines 201 and 202. The abnormality detection circuit 266 checks the memory (not shown) in the communication circuit 263 and monitors whether or not the communication circuit 263 has established transmission with another communication station to determine whether or not the communication circuit 263 has an abnormality. Is detected. Control circuit 267
Outputs a control signal to each communication station, that is, a signal in which a switching command is issued to a switching circuit of each communication station. The resistance measurement circuit 268 is connected to the branch lines 261 and 26.
2, a resistance value between the main transmission lines 201 and 202 is detected. The diagnosis unit 269 determines whether the communication station is abnormal or the branch line connected to the communication station is abnormal, according to the resistance value measured by the resistance measurement circuit 268.
【００２９】上述したネットワークシステムにおいて通
常の通信を行う時、各通信局の通信回路と枝分岐線とが
各通信局の切替え回路により接続される。すなわち、通
信局２１０では、通信回路２１３と枝分岐線２１１およ
び２１２とが切替え回路２１５を介して接続される。通
信局２２０では、通信回路２２３と枝分岐線２２１およ
び２２２とが切替え回路２２５を介して接続される。通
信局２３０では、通信回路２３３と枝分岐線２３１およ
び２３２とが切替え回路２３５を介して接続される。こ
れにより、各通信局と他の通信局との間で通信が行われ
る。When ordinary communication is performed in the above-described network system, the communication circuit of each communication station and the branch line are connected by the switching circuit of each communication station. That is, in the communication station 210, the communication circuit 213 is connected to the branch lines 211 and 212 via the switching circuit 215. In the communication station 220, the communication circuit 223 and the branch lines 221 and 222 are connected via the switching circuit 225. In the communication station 230, the communication circuit 233 is connected to the branch lines 231 and 232 via a switching circuit 235. Thus, communication is performed between each communication station and another communication station.
【００３０】ネットワークシステムの異常時に通信局か
枝分岐線かを切り分け診断する時、診断器２６０の制御
回路２６７は制御信号を出力する。制御信号は通信回路
２６３により各通信局の通信回路２１３、２２３、およ
び２３３に送られる。通信回路２１３は制御信号を受信
すると、切替え回路２１５に切替え信号を送り、抵抗器
２１４を枝分岐線２１１および２１２間に接続させる。
同様に、通信回路２２３は制御信号を受信すると、切替
え回路２２５に切替え信号を送り、抵抗器２２４を枝分
岐線２２１および２２２間に接続させる。さらに、通信
回路２３３は制御信号を受信すると、切替え回路２３５
に切替え信号を送り、抵抗器２３４を枝分岐線２３１お
よび２３２間に接続させる。このように、診断器２６０
との間で通信できる通信局に対して、伝送路を介して当
該通信局内の切替え回路を切替える信号が送られるの
で、当該通信局の枝分岐線間に抵抗器が接続される。When the communication system or the branch line is to be diagnosed when the network system is abnormal, the control circuit 267 of the diagnostic device 260 outputs a control signal. The control signal is sent by the communication circuit 263 to the communication circuits 213, 223, and 233 of each communication station. When receiving the control signal, the communication circuit 213 sends a switching signal to the switching circuit 215 to connect the resistor 214 between the branch lines 211 and 212.
Similarly, when receiving the control signal, the communication circuit 223 sends a switching signal to the switching circuit 225 to connect the resistor 224 between the branch lines 221 and 222. Further, when the communication circuit 233 receives the control signal, the switching circuit 235
To switch the resistor 234 between the branch lines 231 and 232. Thus, the diagnostic device 260
A signal for switching a switching circuit in the communication station is transmitted to a communication station capable of communicating with the communication station via a transmission line, so that a resistor is connected between the branch lines of the communication station.
【００３１】一方、各通信局内では、当該通信局内の通
信回路に異常を検出すると、切替え回路に切替え信号を
送る。すなわち、通信局２１０では、異常検出回路２１
６が通信回路２１３の異常を検出すると、切替え回路２
１５に切替え信号を送り、抵抗器２１４を枝分岐線２１
１および２１２間に接続させる。通信局２２０では、異
常検出回路２２６が通信回路２２３の異常を検出する
と、切替え回路２２５に切替え信号を送り、抵抗器２２
４を枝分岐線２２１および２２２間に接続させる。通信
局２３０では、異常検出回路２３６が通信回路２３３の
異常を検出すると、切替え回路２３５に切替え信号を送
り、抵抗器２３４を枝分岐線２３１および２３２間に接
続させる。このように、診断器２６０との間で通信でき
ない通信局は当該通信局内で切替え信号を発生するの
で、当該通信局の枝分岐線間に抵抗器が接続される。な
お、枝分岐線間に抵抗器が接続された際、抵抗器の抵抗
値Ｒは十分に高インピーダンスにされているので、抵抗
器が接続されることによって伝送路の通信に影響を与え
ることはない。On the other hand, in each communication station, when an abnormality is detected in the communication circuit in the communication station, a switching signal is sent to the switching circuit. That is, in the communication station 210, the abnormality detection circuit 21
6 detects an abnormality in the communication circuit 213, the switching circuit 2
15 and a resistor 214 is connected to the branch line 21.
1 and 212 are connected. In the communication station 220, when the abnormality detection circuit 226 detects an abnormality in the communication circuit 223, it sends a switching signal to the switching circuit 225 and
4 is connected between the branch lines 221 and 222. In the communication station 230, when the abnormality detection circuit 236 detects an abnormality in the communication circuit 233, it sends a switching signal to the switching circuit 235 to connect the resistor 234 between the branch lines 231 and 232. As described above, since a communication station that cannot communicate with the diagnostic device 260 generates a switching signal in the communication station, a resistor is connected between the branch lines of the communication station. When a resistor is connected between the branch lines, the resistance value R of the resistor is set to a sufficiently high impedance, so that the connection of the resistor does not affect the communication of the transmission line. Absent.
【００３２】診断器２６０の診断部２６９は、各通信局
の枝分岐線間に抵抗器が接続された後で、抵抗測定回路
２６８で検出される抵抗値に応じて、通信局の異常か、
当該通信局に接続される枝分岐線の異常かを判別する。
たとえば、通信局２１０が通信局２２０および２３０の
いずれとも通信できない場合、通信局２１０自体に発生
した異常と、枝分岐線２１１および２１２の少なくとも
一方に生じた異常とが考えられる。このとき、診断部２
６９は、抵抗測定回路２６８で検出される抵抗値がＲ／
３の場合に、枝分岐線２１１および２１２の異常ではな
く、通信局２１０の異常と判定する。一方、抵抗測定回
路２６８で検出される抵抗値がＲ／２の場合に、通信局
２１０の異常ではなく、枝分岐線２１１および２１２の
少なくとも一方の異常と判定する。枝分岐線の異常は、
たとえば断線である。ここで、通信局２１０が通信局２
２０および２３０のいずれとも通信できないことは、従
来技術と同様の通信可否検出装置によって診断されてい
る。すなわち、不図示の通信可否検出装置が幹線伝送路
２０１および２０２に取り付けられ、この通信可否検出
装置が幹線伝送路２０１および２０２を介して各通信局
との間で通信の成立／不成立を順次検出することによ
り、どの通信局との間で通信ができないかが診断され
る。The diagnostic unit 269 of the diagnostic device 260 determines whether or not the communication station is abnormal based on the resistance value detected by the resistance measuring circuit 268 after the resistor is connected between the branch lines of each communication station.
It is determined whether the branch line connected to the communication station is abnormal.
For example, when the communication station 210 cannot communicate with any of the communication stations 220 and 230, it is considered that an abnormality occurred in the communication station 210 itself and an abnormality occurred in at least one of the branch lines 211 and 212. At this time, the diagnostic unit 2
69 indicates that the resistance value detected by the resistance measurement circuit 268 is R /
In the case of 3, it is determined that the communication station 210 is not an abnormality of the branch lines 211 and 212 but an abnormality of the communication station 210. On the other hand, when the resistance value detected by the resistance measurement circuit 268 is R / 2, it is determined that the communication station 210 is not abnormal and at least one of the branch lines 211 and 212 is abnormal. The abnormality of the branch line is
For example, disconnection. Here, the communication station 210 is the communication station 2
The inability to communicate with either of the devices 20 and 230 has been diagnosed by a communication availability detection device similar to the prior art. That is, a communication availability detection device (not shown) is attached to the trunk transmission lines 201 and 202, and the communication availability detection device sequentially detects establishment / non-establishment of communication with each communication station via the trunk transmission lines 201 and 202. By doing so, it is diagnosed with which communication station communication is not possible.
【００３３】なお、診断器２６０の通信回路２６３に異
常が生じた場合は、異常検出回路２６６がこれを検出し
て診断部２６９に報知する。診断部２６９は、通信回路
２６３の異常が報知されると診断不可能と判定する。た
とえば、通信回路２６３に異常が生じて制御信号を送信
できない場合、各通信局の枝分岐線間に抵抗器が接続さ
れない。この場合に抵抗測定回路２６８が検出する抵抗
値は、抵抗器による抵抗値ではないので、診断部２６９
が誤った診断をするおそれがある。そこで、診断部２６
９は、通信回路２６３の異常が報知されると診断不可能
と判定する。When an abnormality occurs in the communication circuit 263 of the diagnostic device 260, the abnormality detection circuit 266 detects this and notifies the diagnosis unit 269. The diagnosis unit 269 determines that the diagnosis is not possible when the abnormality of the communication circuit 263 is notified. For example, when an abnormality occurs in the communication circuit 263 and the control signal cannot be transmitted, no resistor is connected between the branch lines of the respective communication stations. In this case, since the resistance value detected by the resistance measurement circuit 268 is not the resistance value of the resistor, the diagnosis unit 269
May make an incorrect diagnosis. Therefore, the diagnosis unit 26
No. 9 determines that the diagnosis is impossible when the abnormality of the communication circuit 263 is notified.
【００３４】以上説明したネットワークシステムにおい
て、診断器２６０の制御回路２６７によって行われる処
理手順の流れは、図２と同様のフローチャートで表すこ
とができる。ただし、ステップＳ２が省略される。すな
わち、通信局２１０、２２０、および２３０内の切替え
回路２１５、２２５、および２３５は、各通信局が電源
オンされるとそれぞれ自動的に通信回路と枝分岐線とを
接続するので、診断器２６０から切替え信号を送信する
必要がない。In the network system described above, the flow of the processing procedure performed by the control circuit 267 of the diagnostic device 260 can be represented by a flowchart similar to FIG. However, step S2 is omitted. That is, the switching circuits 215, 225, and 235 in the communication stations 210, 220, and 230 automatically connect the communication circuit and the branch line when the power of each communication station is turned on. There is no need to transmit a switching signal from the.
【００３５】以上説明した第二の実施の形態によれば、
次の作用効果が得られる。 （１）幹線伝送路２０１、２０２に２本の枝分岐線を介
して接続される通信局２１０、２２０、および２３０の
それぞれにおいて、各枝分岐線間に通信回路および抵抗
器のうち一方を接続する切替え回路２１５、２２５、お
よび２３５を設ける。通信できない通信局が存在する場
合に、診断器２６０によって当該通信局自体の異常か、
当該通信局の枝分岐線の異常かを切り分け診断する時、
診断器２６０は、通信回路２６３から伝送路を介して各
通信局２１０、２２０、および２３０の切替え回路２１
５、２２５、および２３５を切替える制御信号を送り、
各通信局２１０、２２０、および２３０の各枝分岐線間
のそれぞれに抵抗値Ｒの抵抗器２１４、２２４、および
２３４を接続させる。一方、各通信局２１０、２２０お
よび２３０では、当該通信局内の通信回路の異常を判定
すると、当該通信局の切替え回路を切替えて枝分岐線間
に抵抗値Ｒの抵抗器を接続させる。これにより、診断器
２６０は、第一の実施の形態と同様に、幹線伝送路２０
１、２０２間で検出される抵抗値に応じて、通信できな
い通信局自体の異常か、当該通信局の枝分岐線の異常か
を切り分け診断することができる。 （２）診断器２６０は、伝送路を介して各通信局の切替
え回路２１５、２２５、および２３５に制御信号を送る
ようにしたので、第一の実施の形態と異なり、専用の通
信線を設ける必要がなく、コストの増加を抑えることが
できる。 （３）各通信局内に通信回路２１３、２２３、および２
３３の異常の有無をそれぞれ検出する異常検出回路２１
６、２２６、および２３６を設け、異常が検出されると
当該通信局の切替え回路を切替えるようにした。したが
って、診断器２６０の通信回路２６３から送られた制御
信号が、通信回路の異常によって受信されない場合で
も、枝分岐線間に抵抗値Ｒの抵抗器を接続させることが
できる。 （４）診断器２６０の通信回路２６３の異常の有無を検
出する異常検出回路２６６を設け、異常が検出されると
診断部２６９に報知する。診断部２６９は、通信回路２
６３の異常を報知されると診断不可能と判定するように
したので、誤診断を防止できる。According to the second embodiment described above,
The following effects can be obtained. (1) In each of the communication stations 210, 220, and 230 connected to the trunk transmission lines 201, 202 via two branch lines, one of a communication circuit and a resistor is connected between the branch lines. Switching circuits 215, 225, and 235 are provided. If there is a communication station that cannot communicate, the diagnostic device 260 determines whether the communication station itself is abnormal,
When diagnosing whether the branch line of the communication station is abnormal,
The diagnostic device 260 switches the switching circuit 21 of each of the communication stations 210, 220, and 230 from the communication circuit 263 via a transmission line.
Send a control signal to switch between 5, 225 and 235,
Resistors 214, 224, and 234 having a resistance value R are connected between the branch lines of the communication stations 210, 220, and 230, respectively. On the other hand, when each of the communication stations 210, 220, and 230 determines that the communication circuit in the communication station is abnormal, the switching circuit of the communication station is switched to connect a resistor having a resistance value R between the branch lines. As a result, the diagnostic device 260 is connected to the main transmission line 20 in the same manner as in the first embodiment.
In accordance with the resistance value detected between the communication terminals 1 and 202, it can be diagnosed whether the communication station itself cannot communicate or the branch line of the communication station is abnormal. (2) Since the diagnostic device 260 sends a control signal to the switching circuits 215, 225, and 235 of each communication station via a transmission line, unlike the first embodiment, a dedicated communication line is provided. There is no need to increase the cost. (3) Communication circuits 213, 223, and 2 in each communication station
An abnormality detection circuit 21 for detecting the presence or absence of each of the 33 abnormalities
6, 226, and 236 are provided, and when an abnormality is detected, the switching circuit of the communication station is switched. Therefore, even if the control signal sent from the communication circuit 263 of the diagnostic device 260 is not received due to an abnormality in the communication circuit, a resistor having a resistance value R can be connected between the branch lines. (4) An abnormality detection circuit 266 for detecting the presence or absence of an abnormality in the communication circuit 263 of the diagnostic device 260 is provided, and when an abnormality is detected, the diagnosis unit 269 is notified. The diagnosis unit 269 is a communication circuit 2
When the abnormality of 63 is notified, it is determined that the diagnosis is impossible, so that erroneous diagnosis can be prevented.
【００３６】特許請求の範囲における各構成要素と、発
明の実施の形態における各構成要素との対応について説
明すると、伝送路１０１、１０２(２０１、２０２)が幹
線に、通信回路１１３,１２３,１３３(２１３,２２３,
２３３)が通信手段に、抵抗器１１４,１２４,１３４(２
１４,２２４,２３４)が抵抗素子に、切替え回路１１５,
１２５,１３５(２１５,２２５,２３５)が切替え手段
に、抵抗測定回路１６８(２６８)が抵抗値検出手段に、
診断部１６９(２６９)が判別手段に、Ｒ／３が所定値
に、通信回路２６３が送信手段に、異常検出回路２１
６,２２６,２３６が制御手段に、それぞれ対応する。The correspondence between each component in the claims and each component in the embodiment of the invention will be described. The transmission lines 101 and 102 (201 and 202) are used as trunk lines, and the communication circuits 113, 123 and 133 are used. (213,223,
233) are used as communication means, and the resistors 114, 124, 134 (2
14, 224, 234) are resistance elements, and the switching circuit 115,
125, 135 (215, 225, 235) as switching means, the resistance measuring circuit 168 (268) as resistance detecting means,
The diagnosis unit 169 (269) serves as a determining unit, R / 3 takes a predetermined value, the communication circuit 263 serves as a transmitting unit, and the abnormality detecting circuit 21 serves as a transmitting unit.
6, 226 and 236 correspond to the control means, respectively.
【図１】第一の実施の形態による通信診断装置を備えた
ネットワークシステムを示す図である。FIG. 1 is a diagram illustrating a network system including a communication diagnostic device according to a first embodiment.
【図２】ネットワークシステムの操作手順の流れを説明
するフローチャートである。FIG. 2 is a flowchart illustrating a flow of an operation procedure of the network system.
【図３】第二の実施の形態による通信診断装置を備えた
ネットワークシステムを示す図である。FIG. 3 is a diagram illustrating a network system including a communication diagnostic device according to a second embodiment.
１０１,１０２,２０１,２０２…幹線伝送路、１１０,１
２０,１３０,２１０,２２０,２３０…通信局、１１１,
１１２,１２１,１２２,１３１,１３２,１６１,１６２,
２１１,２１２,２２１,２２２,２３１,２３２,２６１,
２６２…枝分岐線、１１３,１２３,１３３,２１３,２２
３,２３３,２６３…通信回路、１１４,１２４,１３４,
２１４,２２４,２３４…抵抗器、１１５,１２５,１３
５,２１５,２２５,２３５…切替え回路、１５０…通信
線、 １６０,２６０…診断器、１６
７,２６７…制御回路、 １６８,２６８…抵抗
測定回路、１６９,２６９…診断部、２１６,２２６,２
３６,２６６…異常検出回路101, 102, 201, 202 ... trunk line, 110, 1
20, 130, 210, 220, 230 ... communication station, 111,
112,121,122,131,132,161,162,
211,212,221,222,231,232,261,
262: Branch and branch line, 113, 123, 133, 213, 22
3,233,263 ... communication circuit, 114,124,134,
214, 224, 234 ... resistors, 115, 125, 13
5, 215, 225, 235 switching circuit, 150 communication line, 160, 260 diagnostic device, 16
7,267 control circuit, 168,268 resistance measurement circuit, 169,269 diagnostic section, 216,226,2
36,266 ... Abnormality detection circuit
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5K032 AA06 CD05 DA19 DB02 DB28 EA02 EA03 EA07 5K035 AA03 BB03 CC08 DD03 EE04 GG11 GG15 HH03 JJ02 KK01 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K032 AA06 CD05 DA19 DB02 DB28 EA02 EA03 EA07 5K035 AA03 BB03 CC08 DD03 EE04 GG11 GG15 HH03 JJ02 KK01
Claims (4)
ぞれ接続する２本の枝分岐線とで構成される伝送路を介
して前記通信局が通信を行う通信システムの異常を検出
する通信診断装置において、 前記通信局に備えられ、前記枝分岐線に接続されて通信
を行う通信手段と、 前記通信局に備えられ、前記枝分岐線間に接続される抵
抗素子と、 前記通信局に備えられ、前記通信回路および前記抵抗素
子のいずれか一方を前記枝分岐線間に択一的に接続する
ように接続切替えを行う切替え手段と、 前記２本の幹線間の抵抗値を検出する抵抗値検出手段
と、 前記切替え手段により前記抵抗素子が前記枝分岐線間に
接続されているとき、前記抵抗値検出手段で検出される
抵抗値に応じて、前記枝分岐線の異常か否かを判別する
判別手段とを備えることを特徴とする通信診断装置。An abnormality is detected in a communication system in which the communication station communicates via a transmission line composed of two trunk lines and two branch lines connecting the trunk line and the communication station. A communication diagnostic device provided in the communication station and connected to the branch line to perform communication; a resistance element provided in the communication station and connected between the branch lines; Switching means provided in a station for performing connection switching so as to selectively connect one of the communication circuit and the resistance element between the branch lines; and detecting a resistance value between the two trunk lines. Resistance value detecting means, and when the resistance element is connected between the branch lines by the switching means, whether or not the branch line is abnormal according to the resistance value detected by the resistance value detecting means. Determining means for determining whether Communication diagnostic apparatus according to claim.
値が所定値より大きいとき、前記枝分岐線の異常と判別
することを特徴とする通信診断装置。2. The communication diagnostic apparatus according to claim 1, wherein the determining means determines that the branch branch line is abnormal when the resistance value detected by the resistance value detecting means is larger than a predetermined value. Characteristic communication diagnostic device.
て送信する送信手段をさらに備え、 前記通信手段は、前記切替え信号を受信すると、前記抵
抗素子を前記枝分岐線間に接続するように前記切替え手
段に指示することを特徴とする通信診断装置。3. The communication diagnostic apparatus according to claim 1, further comprising a transmitting unit that transmits a switching signal to the switching unit via the transmission line, wherein the communication unit receives the switching signal, A communication diagnostic apparatus for instructing the switching means to connect a resistance element between the branch lines.
出するとともに、異常を検出すると前記抵抗素子を前記
枝分岐線間に接続するように前記切替え手段に指示する
制御手段をさらに備えることを特徴とする通信診断装
置。4. The communication diagnostic apparatus according to claim 3, wherein said communication station is provided with said communication station and detects the presence / absence of an abnormality of said communication means, and when said abnormality is detected, connects said resistance element between said branch lines. And a control unit for instructing the switching unit to perform the switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001106301A JP2002305525A (en) | 2001-04-04 | 2001-04-04 | Communication diagnostic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001106301A JP2002305525A (en) | 2001-04-04 | 2001-04-04 | Communication diagnostic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002305525A true JP2002305525A (en) | 2002-10-18 |
Family
ID=18958835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001106301A Pending JP2002305525A (en) | 2001-04-04 | 2001-04-04 | Communication diagnostic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002305525A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015132480A (en) * | 2014-01-09 | 2015-07-23 | 株式会社デンソー | abnormality detection device |
-
2001
- 2001-04-04 JP JP2001106301A patent/JP2002305525A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015132480A (en) * | 2014-01-09 | 2015-07-23 | 株式会社デンソー | abnormality detection device |
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