JPS6367842A - Load controlling system - Google Patents

Load controlling system

Info

Publication number
JPS6367842A
JPS6367842A JP61212461A JP21246186A JPS6367842A JP S6367842 A JPS6367842 A JP S6367842A JP 61212461 A JP61212461 A JP 61212461A JP 21246186 A JP21246186 A JP 21246186A JP S6367842 A JPS6367842 A JP S6367842A
Authority
JP
Japan
Prior art keywords
transmission
bus
transmission line
circuit
abnormality
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.)
Granted
Application number
JP61212461A
Other languages
Japanese (ja)
Other versions
JPH0683214B2 (en
Inventor
Ryoji Minagawa
良司 皆川
Hiroshi Shirakawa
浩 白川
Hiroshi Yamazaki
博史 山崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP61212461A priority Critical patent/JPH0683214B2/en
Priority to GB8721001A priority patent/GB2194867B/en
Priority to CA 546294 priority patent/CA1319741C/en
Priority to DE19873730103 priority patent/DE3730103A1/en
Priority to US07/094,649 priority patent/US4963763A/en
Priority to FR8803041A priority patent/FR2628549B1/en
Publication of JPS6367842A publication Critical patent/JPS6367842A/en
Priority to US07/516,581 priority patent/US5012120A/en
Priority to GB9025401A priority patent/GB2237167B/en
Publication of JPH0683214B2 publication Critical patent/JPH0683214B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To disconnect only a transmission bus where abnormelity occurs from a system selectively by opening a switch element provided to a transmission bus with the abnormality signal output of a transmission line monitoring device and disconnecting the transmission bus from a common bus. CONSTITUTION:It the transmission and reception control circuit 63 of a controller 6 runs away to send out random data onto the transmission bus 1A through a transmitting circuit 62, data received by the receiving circuit 41 of the transmission line monitoring device 3 does not coincide with a packet format, so a reception control circuit 42 sends out an abnormality signal to a controller 45. The controller 3 turns off a relay 52 on detecting the abnormality and breaks its contact 60. Then transmission buses 1A and 1B are disconnected from the common bus 2 and operate independently. Those operation are performed by all transmission line monitoring devices 3. The bus 18 becomes normal after the contact 50 is broken, and the contact 50 is made a specific delay time later.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は信号伝送線に時分割多重により制御信号を伝
送し、負荷の1制御やセンサの状態をモニタする負荷制
御システムに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a load control system that transmits control signals to a signal transmission line by time division multiplexing to control one load and monitor the state of a sensor.

[従来の技術] 第4図は例えば特公昭61−22491号公報に示され
た従来の負荷制御システムを示す構成図であり、図にお
いて、(1)は信号伝送線としての伝送バスでおり、こ
の伝送バス(1)には多数の伝送装置としてのコントロ
ーラ(6)が接続されている。このコントローラ(6)
はリレー回路(5)と伝送バス監視装置(3)とからな
る。
[Prior Art] FIG. 4 is a block diagram showing a conventional load control system disclosed in, for example, Japanese Patent Publication No. 61-22491. In the figure, (1) is a transmission bus as a signal transmission line; A large number of controllers (6) serving as transmission devices are connected to this transmission bus (1). This controller (6)
consists of a relay circuit (5) and a transmission bus monitoring device (3).

上記伝送バス監視装置(3)は送信回路(62)、受信
回路(61> 、伝送制御回路(63)、CPIJ(6
4)、ウォッチトゲ・タイマ(65)とからなり、上記
受信回路(61)、送信回路(62)の入出力側はリレ
ー接点(5A)を介して伝送バス(1)に接続され、上
記ウォッチトゲ・タイマ(65〉の出力側はリレーコイ
ル(5b)に接続されている。
The transmission bus monitoring device (3) includes a transmission circuit (62), a reception circuit (61>), a transmission control circuit (63), and a CPIJ (6
4) and a watchtoge timer (65), the input and output sides of the receiving circuit (61) and transmitting circuit (62) are connected to the transmission bus (1) via a relay contact (5A), The output side of the spike timer (65>) is connected to the relay coil (5b).

次に動作について説明する。伝送制御回路(63)は、
CPU (64)の出力を伝送バス(1)に定められた
伝送フA−マットに変換し送信回路(62)に送出する
とともに、受信回路(61)よりの受信データの復元と
誤り制御を行い、CPU (64>に転送する。
Next, the operation will be explained. The transmission control circuit (63) is
It converts the output of the CPU (64) into a transmission format specified for the transmission bus (1) and sends it to the transmitting circuit (62), and also restores the data received from the receiving circuit (61) and controls errors. , CPU (64>).

データ伝送が行われていると、CPLI (64)から
ウォッチトゲ・タイマ(65)に伝送正常信号が定期的
に出力され、ウォッチトゲ・タイマ(65)を初期状態
にリセットする。この時、ウォッチトゲ・タイマ(65
)には異常検出レベルが設定されているが、定期的にリ
セットされるためこの異常検出レベルに達しない。
When data transmission is being performed, a transmission normal signal is periodically output from the CPLI (64) to the watchtoge timer (65), and the watchtoge timer (65) is reset to the initial state. At this time, watchtoge timer (65
) has an anomaly detection level set, but it does not reach this anomaly detection level because it is reset periodically.

従ってウォッチトゲ・タイマ(65)の出力は、リレー
コイル(5b)を励磁し、リレー接点(5A)は常時閉
じている。
Therefore, the output of the watchtooth timer (65) excites the relay coil (5b), and the relay contact (5A) is always closed.

ところが、次の個所、例えば、(a>他のコントローラ
、(b)伝送バス(1)、(C)送信回路(62)、受
信回路(61)、(d>伝送制御回路(63)のいずれ
かに故障が発生すると、データ伝送が中断する。
However, any of the following parts, for example, (a>other controller, (b) transmission bus (1), (C) transmission circuit (62), reception circuit (61), (d>transmission control circuit (63)) If a failure occurs, data transmission will be interrupted.

データ伝送が中断すると、CPU (64)から伝送正
常信号がウォッチトゲ・タイマ(65)に出力されない
。ウォッチトゲ・タイマ(65)は一定時間以上伝送正
常信号が入力されないと、異常検出レベルに達して出力
がなくなり、リレーコイル(5b)を無励磁とし、リレ
ー接点(5A)が開となり、伝送バス監視装置(3)を
伝送バス(1)より切離す。
When data transmission is interrupted, a transmission normal signal is not output from the CPU (64) to the watchtoge timer (65). If the watchtoge timer (65) does not receive a normal transmission signal for a certain period of time, it will reach the abnormality detection level and will no longer output, the relay coil (5b) will be de-energized, the relay contact (5A) will be open, and the transmission bus will be disconnected. Disconnect the monitoring device (3) from the transmission bus (1).

[発明が解決しようとする問題点] 従来の負荷制御システムは以上のように構成されている
ので、コントローラ毎に伝送バス監視装置が必要で高価
となり、小規模で安価な負荷制御システムを得ることが
困難であるという問題点がおった。
[Problems to be Solved by the Invention] Since the conventional load control system is configured as described above, a transmission bus monitoring device is required for each controller and is expensive. Therefore, it is desirable to obtain a small-scale and inexpensive load control system. The problem was that it was difficult to

この発明は上記のような問題点を解消するためになされ
たもので、伝送バス上の異常を各々の伝送バス毎に容易
に検出し、異常の発生バスを切り離すことができる安価
な負荷制御システムを得ることを目的とする。
This invention was made to solve the above-mentioned problems, and provides an inexpensive load control system that can easily detect abnormalities on each transmission bus and disconnect the bus in which the abnormality occurs. The purpose is to obtain.

[問題点を解決するための手段] この発明に係る負荷制御システムは各種のコントローラ
を接続した多数の伝送バスのそれぞれをスイッチ素子を
介して共通伝送線としての共通バスに接続し、その伝送
バスの状態を監視して異常発生時には前記スイッチ素子
を開放する伝送線監視装置を上記各伝送バスに具描した
ものである。
[Means for Solving the Problems] A load control system according to the present invention connects each of a large number of transmission buses connecting various controllers to a common bus as a common transmission line via a switch element, and Each of the transmission buses is provided with a transmission line monitoring device that monitors the state of the transmission line and opens the switch element when an abnormality occurs.

[作用コ この発明における負荷制御システムは、伝送バスの状態
を検出する伝送線監視装置の異常信号出力によって、伝
送バスに設けたスイッチ素子を開放して該伝送バスを共
通バスから切離すようにしたことにより、異常の発生し
ている伝送バスのみを選択的にシステムから切離すこと
を可能とする。
[Function] The load control system according to the present invention opens a switch element provided on the transmission bus to disconnect the transmission bus from the common bus by outputting an abnormal signal from a transmission line monitoring device that detects the state of the transmission bus. This makes it possible to selectively disconnect only the transmission bus in which an abnormality has occurred from the system.

[実施例] 以下、この発明の一実施例を図についてπ1明する。第
1図において、(1A>、(IB>、(1C)は各々ザ
ブシスデムが接続される第1の伝送バス、(2)は複数
の第1の伝送バス(IA>。
[Example] Hereinafter, an example of the present invention will be explained with reference to the drawings. In FIG. 1, (1A>, (IB>, and 1C) are first transmission buses to which Zabsysdems are connected, and (2) is a plurality of first transmission buses (IA>).

(1B>、(1G>を共通的に接続する第2の伝送バス
としての共通バス、(3)は伝送バス毎に設けられた伝
送線監視装置であり、この伝送線監視装置(3)は伝送
バス(1)の信号を受信する受信回路(41)、この受
信回路(41)の出力から伝送バス(1)の状態を判断
する受信制御回路(42>、この受信制御回路(42)
の出力結果によってリレー(51)を制御し、その接点
(5Q)の開閉を行う制御回路(45)からなる検出装
置(4)と、前記検出装置(4)内の検出回路(45)
からの異常検出信号を所定のフォーマットに変換して共
通バス(2〉に送信する送信制御回路(44)と送信回
路(43)とで構成されている。
A common bus as a second transmission bus that commonly connects (1B>, (1G>), (3) is a transmission line monitoring device provided for each transmission bus, and this transmission line monitoring device (3) A reception circuit (41) that receives signals from the transmission bus (1), a reception control circuit (42>) that determines the state of the transmission bus (1) from the output of this reception circuit (41), and this reception control circuit (42).
a detection device (4) consisting of a control circuit (45) that controls a relay (51) and opens/closes its contact (5Q) according to the output result of the detection device (4); and a detection circuit (45) in the detection device (4).
It is composed of a transmission control circuit (44) and a transmission circuit (43) that convert an abnormality detection signal from the terminal into a predetermined format and transmit it to the common bus (2>).

(6)、(7)、(8)、’  (9>は負荷制ill
用のコントローラであり、これらのコンl−ローラは受
信回路(61)、送信回路(62)と送受信制御回路(
63) 、CPU (64>を基本(1へ成体とし、コ
ントローラ(6)は表示器(65〉を怖え、コントロー
ラ(7)はセンサ(71)、(72)の入力インタフェ
ース、コントローラ(8)は負荷の集中制御用スイッチ
、表示等(図示せず)を有し、コントローラ(9)は負
荷(91>、(92)の制御インタフェースを備えてい
る。
(6), (7), (8),'(9> is load control ill
These controllers are a receiver circuit (61), a transmitter circuit (62), and a transmitter/receiver control circuit (
63), CPU (64> is the basic (1), controller (6) is the indicator (65>), controller (7) is the input interface for sensors (71), (72), controller (8) has a switch for centralized control of loads, a display, etc. (not shown), and the controller (9) has a control interface for the loads (91>, (92)).

このとき伝送バス(IA>、(1B>にそれぞれ接続さ
れたコントローラ(6)、(7)及び(8)、(9)で
1つのサブシステムを構成する。
At this time, controllers (6), (7), (8), and (9) connected to the transmission buses (IA> and (1B>), respectively, constitute one subsystem.

伝送バス(IA>、(IB>上に各コントローラ(6)
、(7)、(8)、(9)から送信される信号は電気的
条件、プロトコルは同一のものであり、例えばコントロ
ーラ(6)、(8)が相互に通信し、サブシステム間に
渡る複合的機能を実現する。
Each controller (6) on the transmission bus (IA>, (IB>)
, (7), (8), and (9) have the same electrical conditions and protocols; for example, the controllers (6) and (8) communicate with each other and pass between subsystems. Realize multiple functions.

次に動作について説明する。第2図は伝送バス(1A>
、(1B>上に送信される制御信号のパケットフォーマ
ット及び各フィールドのビット構成を示す図である。第
3図は、伝送線監視装置(3)が伝送バスの異常を検出
した場合の処理手順を示すフローチャート図である。
Next, the operation will be explained. Figure 2 shows the transmission bus (1A>
, (1B>) is a diagram showing the packet format of the control signal and the bit configuration of each field. FIG. 3 shows the processing procedure when the transmission line monitoring device (3) detects an abnormality in the transmission bus. It is a flowchart figure which shows.

伝送バス(IA>、(1B>に短絡等の故障がなく、各
コントローラ(6)、(7)、(8)。
There are no failures such as short circuits on the transmission buses (IA>, (1B>), and each controller (6), (7), (8).

(9)の送受信回路(6’l)、(62)及び送受信制
御回路(63)が正常に動作している状態では、第2図
に示すパケットフォーマットで正常に信号の送受信が行
われ、コントローラ(6)にはコントローラ(7)のセ
ンサ(71)、(72)の状態が表示されたり、コント
ローラ(8)の操作スイッチで負荷(91)、(92)
を制御することができる。
When the transmitting/receiving circuits (6'l), (62) and the transmitting/receiving control circuit (63) in (9) are operating normally, signals are transmitted and received normally in the packet format shown in Figure 2, and the controller (6) displays the status of the sensors (71) and (72) of the controller (7), and displays the load (91) and (92) using the operation switch of the controller (8).
can be controlled.

このとき、伝送線監視装置(3)の受信回路(41)も
データを受信し、受信制御回路(42)は第2図に示す
時間j1.j2等から正常にデータの送受信が行われて
いることを判断し、制御回路(45)はリレー(51)
を励磁したままとし、接点(50)は閉じられている。
At this time, the reception circuit (41) of the transmission line monitoring device (3) also receives the data, and the reception control circuit (42) receives the data at time j1. The control circuit (45) determines that data is being sent and received normally from the j2 etc., and the relay (51)
remains energized, and the contact (50) is closed.

ここで、例えばコントローラ(6)の送受信制御回路(
63)が暴走し、伝送バス(1A)上にランダムなデー
タを送信回路(62)を介して送出したとすると、伝送
バス(1A>、(IB)、共通バス(2)は前記ランダ
ムデータで埋められてしまい、他のコントローラ(7)
、<8>。
Here, for example, the transmission/reception control circuit (
63) goes out of control and sends random data onto the transmission bus (1A) via the transmission circuit (62), the transmission bus (1A>, (IB), and the common bus (2) are filled with the random data. Buried and other controllers (7)
, <8>.

(9)は送信できなくなる。(9) cannot be sent.

このとき、伝送線監視装置(3)の受信回路(41)が
受信したデータは、第2図に示すパケットフォーマット
に合致しない(すなわち時間t1.t2とも合致しない
)ため、受信制御回路(42)は異常信号を制御装置(
45)に送信する。
At this time, the data received by the reception circuit (41) of the transmission line monitoring device (3) does not match the packet format shown in FIG. is the abnormal signal to the control device (
45).

この信号を受けた制御装置(3)は第3図に示す手順で
処理を開始する。すなわち、異常検出によりリレー(5
1〉を無励磁にし、その接点(50)を開放する(ステ
ップ3−1.3−2>。接点(50)の開放により、伝
送バス(1A>。
The control device (3) receiving this signal starts processing according to the procedure shown in FIG. In other words, relay (5
1> is de-energized and its contact (50) is opened (step 3-1.3-2>. By opening the contact (50), the transmission bus (1A>) is de-energized.

(1B)は共通バス(2)から切離れ単独で動作する。(1B) is separated from the common bus (2) and operates independently.

この動作は全ての伝送線監視装置(3)で行われる。This operation is performed in all transmission line monitoring devices (3).

従って、伝送バス(1B)は単独で動作するために、接
点(50)の開放後は正常に戻り、受、信刊御回路(4
2)の出力も正常になる。この出力の変化によって制御
装置(45)は異常か否かを判断し、異常でなければ、
所定時間遅延後、接点(50)を接続する(ステップ3
−3〜3−5)。
Therefore, since the transmission bus (1B) operates independently, it returns to normal after the contact (50) is opened, and the reception and transmission control circuit (4
The output of 2) also becomes normal. Based on this change in output, the control device (45) determines whether or not there is an abnormality, and if it is not abnormal,
After a predetermined time delay, connect the contact (50) (step 3
-3 to 3-5).

一方、伝送バス(1A)に接続されている伝送線監視装
置(3)も同様に動作するので、その接点(50)を開
放するが、受信制御回路(42)からの信号は異常検出
信号であるため、接点(50)を開放のまま保持し、図
示はしていないが伝送線監視装置(3)に伝送バス(1
A)が異常で接点(50)を開放した表示を行う(ステ
ップ3−6)。その後、所定時間遅延後(ステップ3−
7)、制御I装置(45)は送信制御回路(44)に伝
送バス(1A)が異常であることを報知するデータを引
き渡す。
On the other hand, since the transmission line monitoring device (3) connected to the transmission bus (1A) operates in the same way, its contact (50) is opened, but the signal from the reception control circuit (42) is an abnormality detection signal. Therefore, the contact (50) is held open, and although not shown, the transmission line monitoring device (3) is connected to the transmission bus (1).
A) is abnormal and the contact (50) is displayed as being open (step 3-6). Then, after a predetermined time delay (step 3-
7) The control I device (45) delivers data notifying that the transmission bus (1A) is abnormal to the transmission control circuit (44).

送信制御311回路(44)は送信回路(43)を動作
して、共通バス(2)にデータを第2図に示す所定のフ
ォーマットで送信する。このデータは伝送バス(1B>
、(IC>に接続されたコントローラがそれぞれ受信し
、必要に応じて伝送バス(1A)の異常を表示する(ス
テップ3−8)。
The transmission control 311 circuit (44) operates the transmission circuit (43) to transmit data to the common bus (2) in a predetermined format shown in FIG. This data is transferred to the transmission bus (1B>
, (IC>) receives the information, and displays an abnormality in the transmission bus (1A) as necessary (step 3-8).

この時点では、前記の遅延時間を一定にしでおけば、伝
送バス(1B)の接点(50)は閉じられている。この
ようにして、異常が発生した伝送バスのみを選択的に切
り離して、正常に動作している伝送バスのみを接続する
ことによって伝送バスの異常によるシステムダウンを防
止する。
At this point, if the delay time is kept constant, the contact (50) of the transmission bus (1B) is closed. In this way, only the transmission bus in which an abnormality has occurred is selectively disconnected, and only the normally operating transmission bus is connected, thereby preventing a system down due to an abnormality in the transmission bus.

なお、上記実施例では、コントローラ(6)の送受信制
御回路(63)の試走により、伝送バス(1A〉が異常
になった場合について説明したが、それ以外に伝送バス
(IA)、(1B>の短絡、送受信回路(61)、(6
2)の素子故障による等測的な伝送バスの短絡によって
も、同様の動作が可能である。
In the above embodiment, a case has been described in which the transmission bus (1A) becomes abnormal due to a trial run of the transmission/reception control circuit (63) of the controller (6). short circuit, transmitting/receiving circuit (61), (6
A similar operation is also possible due to isometric transmission bus short circuit due to element failure in 2).

[発明の効果] 以上のように、この発明によれば、各種のコントローラ
を接続した多数の伝送バスのそれぞれをスイッチ素子を
介して共通バスに接続し、上記伝送バスの異常を検出し
て上記スイッチ素子を開放する伝送線監視装置を伝送バ
ス毎に設けるように構成したので、伝送バスの異常を伝
送バス毎に検出し異常が発生したバスのみを選択的に切
り離すことができ、一つの伝送バスの異常により他の伝
送バスのデータ送信ができなくなるシステムダウンを防
止することができる。また、伝送線監視装置は伝送バス
毎に設ければよく、従来のように各コントローラ毎に設
ける必要がないので、仝休の構成が簡略化されるととも
に安価にIM成することができる効果がある。
[Effects of the Invention] As described above, according to the present invention, each of a large number of transmission buses connected to various controllers is connected to a common bus via a switch element, and an abnormality in the transmission bus is detected and the above-mentioned Since the configuration is such that a transmission line monitoring device that opens the switch element is provided for each transmission bus, it is possible to detect an abnormality in each transmission bus and selectively disconnect only the bus in which the abnormality has occurred. It is possible to prevent a system failure in which data transmission on other transmission buses becomes impossible due to an abnormality in the bus. In addition, the transmission line monitoring device only needs to be provided for each transmission bus, and there is no need to provide it for each controller as in the past, which simplifies the idle configuration and allows for inexpensive IM construction. be.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例による負荷制御システムを
示すブロック図、第2図はこの負荷制御システムに適用
する伝送データのフォーマットを示す図、第3図はこの
負荷制御システムにおける伝送線監視装置の動作を示す
フローチャート図、第4図は従来の負荷制御システムを
示すブロック図である。 図において、(1A>、(1B>、(IC>は信号伝送
線(伝送バス)、(2)は共通伝送線(共通バス)、(
3)は伝送線監視装置、(4)は検出装置、(6)、(
7)、(8)、(9)は伝送装置(コントローラ)、(
43)は送信回路、(44)は送信制御回路、(50)
はスイッチ素子(接点)である。 なお、図中、同一符号は同一、又は相当部分を示す。□ 代理人 弁理士 大 岩 増 雄 (他 2名)
FIG. 1 is a block diagram showing a load control system according to an embodiment of the present invention, FIG. 2 is a diagram showing the format of transmission data applied to this load control system, and FIG. 3 is a diagram showing transmission line monitoring in this load control system. A flowchart diagram showing the operation of the device, and FIG. 4 is a block diagram showing a conventional load control system. In the figure, (1A>, (1B>, (IC>) are signal transmission lines (transmission buses), (2) are common transmission lines (common bus), (
3) is a transmission line monitoring device, (4) is a detection device, (6), (
7), (8), and (9) are transmission devices (controllers), (
43) is a transmission circuit, (44) is a transmission control circuit, (50)
is a switch element (contact). In addition, in the figures, the same reference numerals indicate the same or equivalent parts. □ Agent: Masuo Oiwa, patent attorney (and 2 others)

Claims (2)

【特許請求の範囲】[Claims] (1)複数の伝送装置を接続した信号伝送線と、共通伝
送線に接続する前記信号伝送線の接続部に設けたスイッ
チ素子と、前記信号伝送線に伝送される信号の異常を検
出した場合前記スイッチ素子を開放して該信号伝送線を
前記共通伝送線から切り離し異常が解除された場合該ス
イッチ素子を閉成するように各信号伝送線に設けた伝送
線監視装置とを備えた負荷制御システム。
(1) When an abnormality is detected between a signal transmission line that connects multiple transmission devices, a switch element provided at the connection part of the signal transmission line that connects to a common transmission line, and a signal transmitted to the signal transmission line. and a transmission line monitoring device provided on each signal transmission line so as to open the switch element, disconnect the signal transmission line from the common transmission line, and close the switch element when the abnormality is resolved. system.
(2)伝送線監視装置は信号伝送線の信号を受信して該
信号伝送線の状態を判断しスイッチ素子を開閉する検出
回路と、前記検出回路からの異常検出信号の発生を共通
伝送線に送信する送信回路と、前記送信回路を制御する
送信制御回路からなることを特徴とする特許請求の範囲
第(1)項記載の負荷制御システム。
(2) The transmission line monitoring device includes a detection circuit that receives a signal on a signal transmission line, determines the state of the signal transmission line, and opens or closes a switch element, and a detection circuit that detects an abnormality signal from the detection circuit on a common transmission line. The load control system according to claim 1, comprising a transmitting circuit that transmits data and a transmitting control circuit that controls the transmitting circuit.
JP61212461A 1986-09-09 1986-09-09 Load control system Expired - Lifetime JPH0683214B2 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP61212461A JPH0683214B2 (en) 1986-09-09 1986-09-09 Load control system
GB8721001A GB2194867B (en) 1986-09-09 1987-09-07 A transmission line control system and method for disconnecting a sub-bus from a main-bus
CA 546294 CA1319741C (en) 1986-09-09 1987-09-08 Load control system and method for disconnecting sub-bus from main-bus
DE19873730103 DE3730103A1 (en) 1986-09-09 1987-09-08 LOAD CONTROL SYSTEM AND METHOD FOR DISCONNECTING A SUB-BUS FROM A MAIN BUS
US07/094,649 US4963763A (en) 1986-09-09 1987-09-09 Load control system and method for disconnecting sub-bus from main-bus
FR8803041A FR2628549B1 (en) 1986-09-09 1988-03-09 LOAD CONTROL SYSTEM AND METHOD FOR DISCONNECTING SECONDARY BUSES FROM A MAIN BUS
US07/516,581 US5012120A (en) 1986-09-09 1990-04-30 Load control system and method for disconnecting sub-bus from main-bus
GB9025401A GB2237167B (en) 1986-09-09 1990-11-22 Load control system and method for disconnecting sub-bus from main-bus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61212461A JPH0683214B2 (en) 1986-09-09 1986-09-09 Load control system

Publications (2)

Publication Number Publication Date
JPS6367842A true JPS6367842A (en) 1988-03-26
JPH0683214B2 JPH0683214B2 (en) 1994-10-19

Family

ID=16623017

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61212461A Expired - Lifetime JPH0683214B2 (en) 1986-09-09 1986-09-09 Load control system

Country Status (1)

Country Link
JP (1) JPH0683214B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02260849A (en) * 1989-03-31 1990-10-23 Hitachi Ltd Faulty terminal equipment disconnecting system
US6385166B1 (en) 1997-07-23 2002-05-07 Denso Corporation Multiplex communication system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5617546A (en) * 1979-07-20 1981-02-19 Matsushita Electric Works Ltd Protecting device for short circuit of transmission line
JPS59193695A (en) * 1983-04-16 1984-11-02 Ono Michio Emergency priority circuit system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5617546A (en) * 1979-07-20 1981-02-19 Matsushita Electric Works Ltd Protecting device for short circuit of transmission line
JPS59193695A (en) * 1983-04-16 1984-11-02 Ono Michio Emergency priority circuit system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02260849A (en) * 1989-03-31 1990-10-23 Hitachi Ltd Faulty terminal equipment disconnecting system
US6385166B1 (en) 1997-07-23 2002-05-07 Denso Corporation Multiplex communication system

Also Published As

Publication number Publication date
JPH0683214B2 (en) 1994-10-19

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