JPH02305145A - Current loop transmission system - Google Patents
Current loop transmission systemInfo
- Publication number
- JPH02305145A JPH02305145A JP12614989A JP12614989A JPH02305145A JP H02305145 A JPH02305145 A JP H02305145A JP 12614989 A JP12614989 A JP 12614989A JP 12614989 A JP12614989 A JP 12614989A JP H02305145 A JPH02305145 A JP H02305145A
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- current
- loop
- current source
- transmission unit
- 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
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 88
- 238000010586 diagram Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Small-Scale Networks (AREA)
- Dc Digital Transmission (AREA)
Abstract
Description
この発明は、伝送路を流れる電流のオン、オフによって
、各伝送ユニット間で信号の伝送を行うカレントループ
伝送システムに関するものである。The present invention relates to a current loop transmission system that transmits signals between transmission units by turning on and off a current flowing through a transmission path.
第２図は従来のカレントループ伝送システムを示す構成
図であり、図において、！−１．１−２゜１−３は伝送
ユニット、２−１．２−２．２−３は各伝送ユニット１
−１．１−２．１−３の受信用フォトカプラ、３−１．
３−２．３−３は同じく各伝送ユニット１−１．１−２
．１−３の送信用フォトカプラ、４は電流源回路であり
、この電流源回路４によって供給される電流が流れるル
ープ状の伝送路に対し、伝送ユニット１−１〜１−３が
直列に複数個接続され、それぞれの伝送ユニット１−１
〜１−３間で伝送を行う構成となっている。
次に動作について説明する。いま、伝送ユニット１−１
から信号を送信し、伝送ユニッ） １−２゜１−３で受
信する場合について説明する。なお、ここでは、伝送ユ
ニット１−１を送信器、伝送ユニット１−２．１−３を
受信器とする。まず、伝送ユニット１−２．１−３の送
信用フォトカブラ３−２．３−３をオン状態にしておき
、送信器ニー１の送信用フォトカブラ３−１をオン、オ
フすることにより、電流ループの電流をオン、オフする
ことができる。このようにすれば、電流が流れる状態を
′０”、電流が流れない状態を“′Ｉ”に対応させた情
報を、各伝送ユニット１−２．１−３は受信用フォトカ
ブラ２−２．２−３により取り込み、送受信することが
できる。
これらの伝送ユニット１−１．１−２．１−３はそれぞ
れ同一のハードウェア構成となっており、受信用フォト
カブラ２−１〜２−３、送信用フォトカブラ３−１〜３
−３をそれぞれ内蔵しているので、各伝送ユニット１−
１．１−２．１−３間で、送信、受信が可能になり、信
号の伝送を行うことができる。FIG. 2 is a block diagram showing a conventional current loop transmission system, and in the figure, ! -1.1-2゜1-3 is the transmission unit, 2-1.2-2.2-3 is each transmission unit 1
-1.1-2.1-3 reception photocoupler, 3-1.
3-2.3-3 is the same for each transmission unit 1-1.1-2
．． 1-3 is a photocoupler for transmission, 4 is a current source circuit, and a plurality of transmission units 1-1 to 1-3 are connected in series to a loop-shaped transmission path through which the current supplied by the current source circuit 4 flows. each transmission unit 1-1
The configuration is such that transmission is performed between 1 and 3. Next, the operation will be explained. Now, transmission unit 1-1
A case will be explained in which a signal is transmitted from the transmission unit 1-2 and 1-3. Note that here, the transmission unit 1-1 is assumed to be a transmitter, and the transmission unit 1-2.1-3 is assumed to be a receiver. First, by turning on the transmitting photocoupler 3-2.3-3 of the transmission unit 1-2.1-3 and turning on and off the transmitting photocoupler 3-1 of the transmitter knee 1, The current in the current loop can be turned on and off. In this way, each transmission unit 1-2.1-3 transmits information that corresponds to the state in which current flows to '0' and the state in which no current flows to 'I' to the receiving photocoupler 2-2. These transmission units 1-1.1-2.1-3 each have the same hardware configuration, and receive photocoupler 2-1 to 2-2. 3. Photocabra for transmission 3-1~3
Since each transmission unit 1-3 is built-in, each transmission unit 1-3 is built-in.
Transmission and reception are possible between 1.1-2.1-3, and signals can be transmitted.
従来のカレントループ伝送システムは以上のように構成
されているので、各伝送ユニット１−１゜１−２．１−
３に電流を流すのに、電流源回路４を外部に設置しなけ
ればならず、また、この方式では各伝送ユニット１−１
．１−２．１−３に一定電流を流してお（必要があるた
め、電流源回路４の出力電圧によって接続台数が制限さ
れ、例えば、接続台数が減少すると大きな電流が流れて
しまうほか、電流源回路４の故障により、直ちにシステ
ム全体が停止することにもなるなどの課題があった。な
お、かかる従来のカレントループシステムと同様の技術
が、ＣＱ出版社「マイクロコンピュータ・データ伝送の
基礎と実Ｃ」Ｐ１６９〜１７３に記載されている。
この発明は、上記のような課題を解消するためになされ
たもので、電流源回路の出力電圧による接続台数の制服
をなくするとともに、１つの電流源回路が故障しても、
全システムに悪影響を与えることなく正常な伝送ユニッ
ト間で信号伝送を継続できるカレントループ伝送システ
ムを得ることを目的とする。Since the conventional current loop transmission system is configured as described above, each transmission unit 1-1゜1-2.1-
3, the current source circuit 4 must be installed externally, and in this method, each transmission unit 1-1
．． 1-2. A constant current is passed through 1-3 (because it is necessary, the number of connected devices is limited by the output voltage of the current source circuit 4. For example, if the number of connected devices decreases, a large current will flow, and the current There were problems such as a failure of the source circuit 4 would cause the entire system to stop immediately.The same technology as the conventional current loop system was published in CQ Publishing's ``Fundamentals of Microcomputer Data Transmission''. This invention was made to solve the above-mentioned problems, and it eliminates the uniformity in the number of connected devices depending on the output voltage of the current source circuit, and also Even if the power supply circuit fails,
The purpose of the present invention is to obtain a current loop transmission system that can continue signal transmission between normal transmission units without adversely affecting the entire system.
この発明における電流源回路は、ループ状の伝送路に流
す電流を、各伝送ユニットごとに分担して供給するので
、伝送ユニットの増設や減少・にも拘らず、最適の電流
値を引き続き維持できるほか、伝送ユニットの１つが故
障しても、これをバイパスしてシステム全体を停止させ
ることな（運転を継続することができるようにする。The current source circuit in this invention divides and supplies the current flowing through the loop-shaped transmission path to each transmission unit, so it is possible to maintain an optimal current value even if the number of transmission units is increased or decreased. In addition, even if one of the transmission units fails, it can be bypassed and the entire system can continue operating without stopping.
【実施例］
以下、この発明の一実施例を図について説明する。第１
図において、１−１．１−２はループ状の伝送路８に接
続した伝送ユニット、２−１． ２−２は各伝送ユニッ
ト１−１．１−２の受信用フォトカブラ、３−１．３−
２は同じく送信用フォトカプラ、５−１．５−２は各伝
送ユニット１−１．１−２ごとに設置された電流源回路
、６−１゜６−２は同様に設置された送受信回路、７−
１゜７−２は電流源回路５−１．５−２の故障を検出す
るリレー、７−ＩＡ、７−２Ａおよび７−１０゜７−２
Ｂは各リレー７−１．７−２の入力側スイッチおよび出
力側スイッチである。なお、リレー７−１．入力側スイ
ッチ７− Ｉ Ａ、出力側スイッチ７−ＩＢと、リレー
７−２．入力側スイッチ７−２Ａ、出力側スイッチ７−
２Ｂは、それぞれ電流のバイパス装置９．１０を形成し
ている。
次に動作について説明する。いま、伝送ユニット１−１
をデータ送信側とし、伝送ユニット１−２をデータ受信
側と定義して説明する。まず、回路の正常状態において
は、バイパス装置９，１０のリレー７−１．７−２の各
入力側、出力側のスイッチ７−ＩＡ、７−ＩＢ、７−２
Ａ、７−２Ｂは各接片Ｃが接点ａに接続されるようにし
ておき、伝送ユニット１−２では送信用フォトカプラ３
−２をオン状態にしておく。ここで、送受信回路６−１
から送信信号が出力されると、送信用フォトカプラ３−
１がその信号を受けてオン、オフする。
そして、このオン状態では、各電流源回路５−１．５−
２を接続した電流ループに電流が流れ、オフ状態では流
れなくなる。
このように電流ループの電流がオン、オフすると、伝送
ユニッｌ−１−２の受信用フォトカプラ２−２がオン、
オフし、信号が送受信回路６−２に伝わる。
このようにして信号の伝送を行うが、伝送ユニットｌ−
１，１−２は共に同一のハードウェアで送信用フォトカ
プラ２−１．２−２および受信用フォトカプラ３−１．
３−２を内蔵しているため、いずれも送信、受信可能で
ある。また、伝送ユニットが３台以上の複数でも、上記
同様の動作となる。
一方、回路に故障が生じた場合、例えば伝送ユニット１
−１の電流源回路５−１が故障した場合には、この故障
をリレー７−１が検出し、このリレー７−１の入力側ス
イッチ７−ＩＡ、７−ＩＢの接片Ｃを接点すに切り換え
る。このため、伝送ユニット！−２の電流源回路５−２
から出力側スイッチ７−２Ｂを通して流される電流は、
その人力側スイッチ７−ＩＡ、７−ＩＢを流れるだけで
、受信用フォトカプラ２−１．送信用フォトカブラ３−
１および電流源回路５−１をバイパスする。
このため、上記故障後も、伝送ユニット１−１を除く伝
送ユニット１−２および図示しない他の伝送ユニット間
で、引き続き正常で安定的な信号の伝送が実施できるこ
とになる。
なお、上記実施例では電流源回路を各伝送ユニットごと
に分担して設置するものについて説明したが、これを列
車における各車両間で信号の伝送を行うものに利用すれ
ば、各車両間において各種信号を交換することができ、
列車の連結車両数が変わる場合にも容易に対応できるこ
とになる。
【発明の効果】
以上のように、この発明によればループ全体として必要
な電流を、このループを構成する各伝送ユニットに設け
た電流源回路から分担して供給するように構成したので
、上記伝送ユニットの接続台数の制限をなくしてシステ
ムが構成でき、さらに、すべて同一ハードウェアの伝送
ユニットとしてカレントループを形成できるほか、１つ
の電流源回路が故障しても、システム全体に悪影響を与
えることが、なくなるものが得られる効果がある。[Example] An example of the present invention will be described below with reference to the drawings. 1st
In the figure, 1-1.1-2 is a transmission unit connected to a loop-shaped transmission line 8, 2-1. 2-2 is a receiving photocoupler for each transmission unit 1-1.1-2, 3-1.3-
2 is a photocoupler for transmission, 5-1.5-2 is a current source circuit installed in each transmission unit 1-1.1-2, and 6-1゜6-2 is a transmitting/receiving circuit installed in the same way. , 7-
1゜7-2 is a relay that detects a failure of the current source circuit 5-1.5-2, 7-IA, 7-2A and 7-10゜7-2
B is an input side switch and an output side switch of each relay 7-1, 7-2. In addition, relay 7-1. Input side switch 7-IA, output side switch 7-IB, and relay 7-2. Input side switch 7-2A, output side switch 7-
2B form a current bypass device 9, 10, respectively. Next, the operation will be explained. Now, transmission unit 1-1
The explanation will be given by defining the transmission unit 1-2 as the data transmitting side and the data receiving side as the transmission unit 1-2. First, in the normal state of the circuit, the switches 7-IA, 7-IB, 7-2 on the input side and output side of the relays 7-1, 7-2 of the bypass devices 9 and 10
A, 7-2B are arranged so that each contact piece C is connected to contact a, and in the transmission unit 1-2, the transmitting photocoupler 3
-2 is turned on. Here, the transmitting/receiving circuit 6-1
When a transmission signal is output from the transmission photocoupler 3-
1 receives the signal and turns on and off. In this on state, each current source circuit 5-1.5-
Current flows through the current loop connecting 2, and stops flowing in the off state. When the current in the current loop turns on and off in this way, the receiving photocoupler 2-2 of the transmission unit l-1-2 turns on and off.
It is turned off and the signal is transmitted to the transmitting/receiving circuit 6-2. Signals are transmitted in this way, and the transmission unit l-
1 and 1-2 are the same hardware, and include a transmitting photocoupler 2-1.2-2 and a receiving photocoupler 3-1.
3-2, both can transmit and receive. Further, even if there are three or more transmission units, the same operation as above is performed. On the other hand, if a failure occurs in the circuit, for example, transmission unit 1
When the current source circuit 5-1 of -1 fails, the relay 7-1 detects this failure and connects the contacts C of the input side switches 7-IA and 7-IB of this relay 7-1. Switch to . For this reason, the transmission unit! -2 current source circuit 5-2
The current flowing through the output side switch 7-2B from
The flow only flows through the manual side switches 7-IA and 7-IB, and the receiving photocoupler 2-1. Transmission photocobra 3-
1 and the current source circuit 5-1. Therefore, even after the above failure, normal and stable signal transmission can continue to be carried out between the transmission unit 1-2 other than the transmission unit 1-1 and other transmission units (not shown). In the above embodiment, the current source circuit is divided and installed in each transmission unit, but if this is used to transmit signals between each car on a train, various types of signals can be transmitted between each car. signals can be exchanged,
This makes it easier to deal with changes in the number of connected cars in a train. [Effects of the Invention] As described above, according to the present invention, the current required for the entire loop is distributed and supplied from the current source circuit provided in each transmission unit making up this loop, so the above-mentioned A system can be configured without any restrictions on the number of transmission units that can be connected, and in addition, a current loop can be formed as all transmission units have the same hardware, and even if one current source circuit fails, it will not adversely affect the entire system. However, it has the effect of gaining what is lost.
第１図はこの発明の一実施例によるカレントループ伝送
システムを示す構成図、第２図は従来のカレントループ
伝送システムを示す構成図である。
１−１．１−２は伝送ユニット、５−１．５−２は電流
源回路、８は伝送路、９．ＩＯはバイパス装置。
なお、図中、同一符号は同一、または相当部分を示す。
特 許 出 願 人 三菱電機株式会社代理人
弁理士 １）澤 博 昭（外２名）
酵
ＧFIG. 1 is a block diagram showing a current loop transmission system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional current loop transmission system. 1-1.1-2 is a transmission unit, 5-1.5-2 is a current source circuit, 8 is a transmission line, 9. IO is a bypass device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation agent
Patent attorney 1) Hiroshi Sawa (2 others) Ko G
Claims (1)
の伝送路に入れた複数の伝送ユニット間で信号の授受を
行うカレントループ伝送システムにおいて、上記伝送ユ
ニットのそれぞれに設けられて、上記電流を分担して出
力する電流源回路と、上記伝送ユニットのそれぞれに設
けられて、上記電流源回路の故障時に、この故障が生じ
た上記電流源回路側の伝送ユニットをバイパスするよう
に上記伝送路を形成するバイパス装置とを設けたことを
特徴とするカレントループ伝送システム。In a current loop transmission system in which signals are exchanged between a plurality of transmission units connected to this transmission path by turning on and off a current flowing through a loop-shaped transmission path, a current loop transmission system is provided in each of the transmission units to transmit the current. The transmission line is provided in each of the current source circuit that shares the output and the transmission unit, so that when the current source circuit fails, the transmission line is configured to bypass the transmission unit on the current source circuit side where the failure occurs. A current loop transmission system comprising: a bypass device for forming a current loop;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126149A JPH077964B2 (en) | 1989-05-19 | 1989-05-19 | Current loop transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1126149A JPH077964B2 (en) | 1989-05-19 | 1989-05-19 | Current loop transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02305145A true JPH02305145A (en) | 1990-12-18 |
| JPH077964B2 JPH077964B2 (en) | 1995-01-30 |
Family
ID=14927890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1126149A Expired - Lifetime JPH077964B2 (en) | 1989-05-19 | 1989-05-19 | Current loop transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH077964B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11509394A (en) * | 1995-07-14 | 1999-08-17 | センサーマティック・エレクトロニクス・コーポレーション | Synchronous electronic network with built-in backup master |
| WO2010032637A1 (en) * | 2008-09-22 | 2010-03-25 | ダイキン工業株式会社 | Communication module, communication system and air conditioner |
| JP2010183341A (en) * | 2009-02-05 | 2010-08-19 | Daikin Ind Ltd | Communication module, queuing method for communication model and abnormality determination method of communication system |
| CN113960941A (en) * | 2021-09-22 | 2022-01-21 | 北京航天巨恒系统集成技术有限公司 | Motion control method and device and electronic equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63200644A (en) * | 1987-02-16 | 1988-08-18 | Nec Corp | Current loop local area network system |
-
1989
- 1989-05-19 JP JP1126149A patent/JPH077964B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63200644A (en) * | 1987-02-16 | 1988-08-18 | Nec Corp | Current loop local area network system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11509394A (en) * | 1995-07-14 | 1999-08-17 | センサーマティック・エレクトロニクス・コーポレーション | Synchronous electronic network with built-in backup master |
| WO2010032637A1 (en) * | 2008-09-22 | 2010-03-25 | ダイキン工業株式会社 | Communication module, communication system and air conditioner |
| JP2010098726A (en) * | 2008-09-22 | 2010-04-30 | Daikin Ind Ltd | Communication module, communication system and air conditioner |
| JP4582250B2 (en) * | 2008-09-22 | 2010-11-17 | ダイキン工業株式会社 | Communication module, communication system, and air conditioner |
| CN102160396A (en) * | 2008-09-22 | 2011-08-17 | 大金工业株式会社 | Communication module, communication system and air conditioner |
| AU2009293895B2 (en) * | 2008-09-22 | 2013-08-22 | Daikin Industries, Ltd. | Communication module, communication system and air conditioner |
| US8856403B2 (en) | 2008-09-22 | 2014-10-07 | Daikin Industries, Ltd. | Communication module, communication system and air conditioner |
| JP2010183341A (en) * | 2009-02-05 | 2010-08-19 | Daikin Ind Ltd | Communication module, queuing method for communication model and abnormality determination method of communication system |
| CN113960941A (en) * | 2021-09-22 | 2022-01-21 | 北京航天巨恒系统集成技术有限公司 | Motion control method and device and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH077964B2 (en) | 1995-01-30 |
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