JPH07162345A - Multi-point inputting two-wire transmitter - Google Patents
Multi-point inputting two-wire transmitterInfo
- Publication number
- JPH07162345A JPH07162345A JP34037993A JP34037993A JPH07162345A JP H07162345 A JPH07162345 A JP H07162345A JP 34037993 A JP34037993 A JP 34037993A JP 34037993 A JP34037993 A JP 34037993A JP H07162345 A JPH07162345 A JP H07162345A
- Authority
- JP
- Japan
- Prior art keywords
- nth
- local power
- sub
- transmission data
- power supply
- 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.)
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Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、温度センサ等のセン
サからの検出信号を入力とし、この検出信号をディジタ
ル信号に変換して送信データを生成し、この送信データ
を電源の供給通路を兼ねる２線の伝送路を介して上位装
置へ送る２線式伝送器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention receives a detection signal from a sensor such as a temperature sensor, converts the detection signal into a digital signal to generate transmission data, and the transmission data also serves as a power supply path. The present invention relates to a two-wire type transmitter that sends data to a host device via a two-wire transmission path.
【０００２】[0002]
【従来の技術】従来、この種の２線式伝送器は、図２に
示すように、Ａ／Ｄ変換回路１と、サブＣＰＵ２と、ア
イソレーション回路３と、メインＣＰＵ４と、ドライバ
回路５と、電源生成回路（ＲＥＧ）６とを備えている。2. Description of the Related Art Conventionally, as shown in FIG. 2, a two-wire type transmitter of this type has an A / D conversion circuit 1, a sub CPU 2, an isolation circuit 3, a main CPU 4, and a driver circuit 5. , And a power generation circuit (REG) 6.
【０００３】この２線式伝送器において、電源生成回路
６は、２線の伝送路Ｌ１からの電流（４ｍＡ）の供給を
受けて電源を生成し、その電源をＡ／Ｄ変換回路１，サ
ブＣＰＵ２，アイソレーション回路３，メインＣＰＵ４
へ供給する。電源の供給を受けたＡ／Ｄ変換回路１は、
熱電対や測温抵抗体等の温度センサＴＣからの検出信号
をディジタル信号に変換する。Ａ／Ｄ変換回路１により
変換されたディジタル信号はサブＣＰＵ２へ与えられ
る。サブＣＰＵ２は、入力されるディジタル信号より、
送信データを生成する。この送信データは、メインＣＰ
Ｕ４からの返送要求に応えて、メインＣＰＵ４へ送られ
る。In this two-wire type transmitter, the power supply generation circuit 6 receives a current (4 mA) supplied from the two-wire transmission line L1 to generate a power supply, and uses the power supply as the A / D conversion circuit 1 and the sub-circuit. CPU2, isolation circuit 3, main CPU4
Supply to. The A / D conversion circuit 1 which is supplied with power is
A detection signal from a temperature sensor TC such as a thermocouple or a resistance temperature detector is converted into a digital signal. The digital signal converted by the A / D conversion circuit 1 is given to the sub CPU 2. The sub CPU 2 receives from the input digital signal,
Generate send data. This transmission data is the main CP
It is sent to the main CPU 4 in response to the return request from U4.
【０００４】この際、メインＣＰＵ４からの返送要求お
よびサブＣＰＵ２からの送信データは、アイソレーショ
ン回路３においてアイソレーションされたうえ、サブＣ
ＰＵ２およびメインＣＰＵ４へ送られる。この例では、
アイソレーション回路４として、フォトカプラが用いら
れている。サブＣＰＵ２からの送信データを受信する
と、メインＣＰＵ４は、ドライバ回路５を駆動し、その
受信した送信データを２線の伝送路Ｌ２に流れる電流Ｉ
の変化として上位装置へ送る。この場合、測定レンジの
０〜１００％に対し、電流Ｉは４〜２０ｍＡの変化とし
て現れる。At this time, the return request from the main CPU 4 and the transmission data from the sub CPU 2 are isolated by the isolation circuit 3 and the sub C
It is sent to the PU 2 and the main CPU 4. In this example,
A photo coupler is used as the isolation circuit 4. When the transmission data from the sub CPU 2 is received, the main CPU 4 drives the driver circuit 5 to send the received transmission data to the current I flowing through the transmission line L2 of two lines.
Is sent to the higher-level device. In this case, the current I appears as a change of 4 to 20 mA with respect to 0 to 100% of the measurement range.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の２線式伝送器１００によると、一点の温度し
か測定できない。すなわち、一点の測定データを上位装
置へ伝送することしかできない。このため、多点の温度
を測定し、その測定データを上位装置へ伝送したい場合
には、２線式伝送器１００を多数設け、これら２線式伝
送器１００と上位装置との間に伝送路Ｌ１，Ｌ２を各個
に敷設しなければならず、ケーブルの敷設数の増大およ
び敷設工数の増大によりコストがかかり、不経済である
という問題があった。また、このようにすると、各２線
式伝送器１００においてその動作電力として最低でも４
ｍＡの電力が消費されるため、すなわち４ｍＡ×２線式
伝送器１００の数だけの電力が最低でも必要となるた
め、上位装置において大容量の電源を必要とするという
問題が生ずるものであった。However, according to such a conventional two-wire type transmitter 100, only one temperature can be measured. That is, the measurement data at one point can only be transmitted to the host device. Therefore, when it is desired to measure temperatures at multiple points and transmit the measured data to the host device, a large number of 2-wire type transmitters 100 are provided, and a transmission path is provided between the 2-wire type transmitter 100 and the host device. L1 and L2 must be laid on each piece, and there is a problem that the cost is increased and the economy is uneconomical due to an increase in the number of cables to be laid and an increase in the number of laying steps. Further, in this way, the operating power of each 2-wire transmitter 100 is at least 4 at least.
Since the electric power of mA is consumed, that is, the electric power corresponding to the number of 4 mA × 2-wire type transmitter 100 is required at the minimum, the problem arises that the host device needs a large capacity power source. .
【０００６】本発明はこのような課題を解決するために
なされたもので、その目的とするところは、上位装置に
おいて大容量の電源を必要とせず、また上位装置との間
に２線の伝送路を一つ敷設するのみで多点の測定データ
を上位装置へ伝送することのできる多点入力２線式伝送
器を提供することにある。The present invention has been made in order to solve such a problem, and an object of the present invention is not to require a large-capacity power source in a host device, and to transmit two wires between the host device and the host device. An object of the present invention is to provide a multi-point input two-wire type transmitter that can transmit multi-point measurement data to a host device by laying only one path.
【０００７】[0007]
【課題を解決するための手段】このような目的を達成す
るために、本発明は、第１〜第Ｎのセンサからの検出信
号をディジタル信号に変換する第１〜第ＮのＡ／Ｄ変換
手段と、この第１〜第ＮのＡ／Ｄ変換手段の変換したデ
ィジタル信号を入力とし送信データを生成する第１〜第
Ｎのサブ演算処理手段と、この第１〜第Ｎのサブ演算処
理手段の生成する送信データに対しての返送要求および
この返送要求に応えて返送される送信データをアイソレ
ーションして伝送する第１〜第Ｎのアイソレーション手
段と、２線の伝送路からの電流の供給を受けてメイン電
源を生成するメイン電源生成手段およびローカル電源を
生成する第１〜第Ｎのローカル電源生成手段と、メイン
電源生成手段の生成するメイン電源の供給を受けて、第
１〜第Ｎのローカル電源生成手段を順次に切り替えて作
動させ、この第１〜第Ｎのローカル電源生成手段の生成
するローカル電源を第１〜第ＮのＡ／Ｄ変換手段，サブ
演算処理手段およびアイソレーション手段へ供給すると
共に、ローカル電源の供給されるサブ演算処理手段へそ
のサブ演算処理手段の生成する送信データに対しての返
送要求を送り、この返送要求に応えて返送されてくる送
信データを受信し、この受信した送信データを伝送路に
流れる電流の変化として上位装置へ送るメイン演算処理
手段とを備えたものである。In order to achieve such an object, the present invention provides first to Nth A / D conversions for converting detection signals from the first to Nth sensors into digital signals. Means, first to Nth sub-arithmetic processing means for inputting the digital signal converted by the first to Nth A / D conversion means, and generating transmission data, and the first to Nth sub-arithmetic processing. A return request for the transmission data generated by the means and first to Nth isolation means for isolating and transmitting the transmission data returned in response to the return request, and a current from the two-wire transmission path Of the main power generation means for generating the main power and the first to Nth local power generation means for generating the local power, and the main power generation generated by the main power generation means for supplying the main power. Nth local The power supply generation means is sequentially switched to operate and the local power supply generated by the first to Nth local power supply generation means is supplied to the first to Nth A / D conversion means, the sub arithmetic processing means and the isolation means. At the same time, a return request for the transmission data generated by the sub-arithmetic processing means is sent to the sub-arithmetic processing means to which local power is supplied, and the transmission data returned in response to the return request is received. The main processing unit sends the received transmission data to the host device as a change in the current flowing through the transmission path.
【０００８】[0008]
【作用】したがってこの発明によれば、２線の伝送路か
らの電流の供給を受けて、メイン電源生成手段がメイン
電源を生成する。このメイン電源の供給を受けて、メイ
ン演算処理手段は、第１〜第Ｎのローカル電源生成手段
を順次に切り替えて作動させる。第１〜第Ｎのローカル
電源生成手段の生成するローカル電源（伝送路からの電
流の供給を受けて生成されるローカル電源）は、第１〜
第ＮのＡ／Ｄ変換手段，サブ演算処理手段およびアイソ
レーション手段へ供給される。例えば、第１のローカル
電源生成手段が作動した場合には、この第１のローカル
電源生成手段の生成するローカル電源が、第１のＡ／Ｄ
変換手段，第１のサブ演算処理手段および第１のアイソ
レーション手段へ供給される。また、メイン演算処理手
段は、ローカル電源の供給されるサブ演算処理手段へ、
そのサブ演算処理手段の生成する送信データに対しての
返送要求を送り、この返送要求に応えて返送されてくる
送信データを受信し、この受信した送信データを伝送路
に流れる電流の変化として上位装置へ送る。例えば、ロ
ーカル電源の供給されるサブ演算処理手段が第１のサブ
演算処理手段であれば、第１のサブ演算処理手段へ第１
のアイソレーション手段を介して返送要求を送り、この
返送要求に応えて第１のアイソレーション手段を介して
返送されてくる第１のサブ演算処理手段からの送信デー
タを受信し、この受信した送信データを伝送路に流れる
電流の変化として上位装置へ送る。Therefore, according to the present invention, the main power supply generating means receives the supply of the current from the two-wire transmission line to generate the main power supply. Upon receiving the supply of the main power source, the main arithmetic processing means sequentially switches the first to Nth local power source generating means to operate. The local power sources generated by the first to N-th local power source generating means (local power sources generated by receiving current from the transmission path) are
It is supplied to the N-th A / D conversion means, sub-arithmetic processing means and isolation means. For example, when the first local power generation means operates, the local power generated by the first local power generation means is the first A / D.
It is supplied to the conversion means, the first sub arithmetic processing means, and the first isolation means. Further, the main arithmetic processing means, to the sub arithmetic processing means to which the local power is supplied,
A return request for the transmission data generated by the sub-arithmetic processing unit is sent, the transmission data returned in response to the return request is received, and the received transmission data is sent as a change in the current flowing through the transmission path. Send to the device. For example, if the sub-arithmetic processing means to which the local power is supplied is the first sub-arithmetic processing means, the first sub-arithmetic processing means is connected to the first sub-arithmetic processing means.
A return request is sent via the isolation means, and in response to the return request, the transmission data from the first sub-arithmetic processing means sent back via the first isolation means is received, and the received transmission is received. Data is sent to the host device as a change in the current flowing through the transmission path.
【０００９】[0009]
【実施例】以下、本発明を実施例に基づき詳細に説明す
る。図１はこの発明の一実施例を示す多点入力２線式伝
送器のブロック回路構成図である。同図において、１−
１〜１−４は第１〜第４のＡ／Ｄ変換回路、２−１〜２
−４は第１〜第４のサブＣＰＵ、３−１〜３−４は第１
〜第４のアイソレーション回路、４’はメインＣＰＵ、
５はドライバ回路、７はメイン電源生成回路（ＲＥＧメ
イン）、８−１〜８−４はローカル電源生成回路（ＲＥ
Ｇ１〜ＲＥＧ４）、９はデータセレクタである。EXAMPLES The present invention will now be described in detail based on examples. FIG. 1 is a block circuit diagram of a multi-point input two-wire transmitter showing an embodiment of the present invention. In the figure, 1-
1 to 1-4 are first to fourth A / D conversion circuits, 2-1 to 2
-4 is first to fourth sub CPU, 3-1 to 3-4 are first
~ Fourth isolation circuit, 4'is the main CPU,
Reference numeral 5 is a driver circuit, 7 is a main power supply generation circuit (REG main), and 8-1 to 8-4 are local power supply generation circuits (RE).
G1 to REG4) and 9 are data selectors.
【００１０】この多点入力２線式伝送器１００’におい
て、メイン電源生成回路７は、伝送路Ｌ１からの電流の
供給を受けてメイン電源ＰＷＲM を生成し、メインＣＰ
Ｕ４’へ与える。メインＣＰＵ４’は、このメイン電源
ＰＷＲM の供給を受けて、予め定められているプログラ
ムに従って動作する。先ず、メインＣＰＵ４’は、発振
選択信号Ｓ１をローカル電源生成回路８−１へ送る。こ
れにより、ローカル電源生成回路８−１が作動し、伝送
路Ｌ１からの電流の供給を受けてローカル電源ＰＷＲ１
を生成し、Ａ／Ｄ変換回路１−１，サブＣＰＵ２−１，
アイソレーション回路３−１へ供給する。ローカル電源
ＰＷＲ１の供給を受けて、Ａ／Ｄ変換回路１−１は、温
度センサＴＣ１からの検出信号をディジタル信号に変換
し、サブＣＰＵ２−１へ送る。サブＣＰＵ２−１は、入
力されるディジタル信号より、送信データを生成する。In this multi-point input two-wire type transmitter 100 ', the main power supply generation circuit 7 receives the current from the transmission line L1 to generate the main power supply PWR M , and the main CP
Give to U4 '. The main CPU 4 ′ receives the main power PWR M and operates according to a predetermined program. First, the main CPU 4 ′ sends the oscillation selection signal S1 to the local power supply generation circuit 8-1. As a result, the local power supply generation circuit 8-1 operates, receives the current from the transmission line L1, and receives the local power supply PWR1.
To generate the A / D conversion circuit 1-1, the sub CPU 2-1,
It is supplied to the isolation circuit 3-1. Upon receiving the supply of the local power supply PWR1, the A / D conversion circuit 1-1 converts the detection signal from the temperature sensor TC1 into a digital signal and sends it to the sub CPU 2-1. The sub CPU 2-1 generates transmission data from the input digital signal.
【００１１】一方、メインＣＰＵ４’は、発振選択信号
Ｓ１をデータセレクタ９へも送る。この発振選択信号Ｓ
１を受けて、データセレクタ９は、メインＣＰＵ４’か
らのラインＬ３を介する返送要求（シリアルデータ）を
アイソレーション回路３−１を介してサブＣＰＵ２−１
へ送る。サブＣＰＵ２−１は、メインＣＰＵ４’からの
返送要求に応えて、送信データ（シリアルデータ）をア
イソレーション回路３−１およびデータセレクタ９を介
しラインＬ４を通してメインＣＰＵ４’へ送る。メイン
ＣＰＵ４’は、ドライバ回路５を駆動し、その受信した
サブＣＰＵ２−１からの送信データを伝送路Ｌ２に流れ
る電流Ｉの変化として上位装置へ送る。On the other hand, the main CPU 4'also sends the oscillation selection signal S1 to the data selector 9. This oscillation selection signal S
In response to 1, the data selector 9 sends a return request (serial data) from the main CPU 4 ′ via the line L3 to the sub CPU 2-1 via the isolation circuit 3-1.
Send to. In response to the return request from the main CPU 4 ′, the sub CPU 2-1 sends the transmission data (serial data) to the main CPU 4 ′ via the isolation circuit 3-1 and the data selector 9 through the line L4. The main CPU 4'drives the driver circuit 5 and sends the received transmission data from the sub CPU 2-1 to the host device as a change in the current I flowing through the transmission line L2.
【００１２】次に、メインＣＰＵ４’は、発振選択信号
Ｓ２をローカル電源生成回路８−２へ送る。これによ
り、ローカル電源生成回路８−１に替わってローカル電
源生成回路８−２が作動する。ローカル電源生成回路８
−２は、伝送路Ｌ１からの電流の供給を受けてローカル
電源ＰＷＲ２を生成し、Ａ／Ｄ変換回路１−２，サブＣ
ＰＵ２−２，アイソレーション回路３−２へ供給する。
ローカル電源ＰＷＲ２の供給を受けて、Ａ／Ｄ変換回路
１−２は、温度センサＴＣ２からの検出信号をディジタ
ル信号に変換し、サブＣＰＵ２−２へ送る。サブＣＰＵ
２−２は、入力されるディジタル信号より、送信データ
を生成する。Next, the main CPU 4'sends an oscillation selection signal S2 to the local power supply generation circuit 8-2. As a result, the local power supply generation circuit 8-2 operates in place of the local power supply generation circuit 8-1. Local power generation circuit 8
-2 receives the current supplied from the transmission line L1 to generate the local power supply PWR2, and the A-D conversion circuit 1-2 and the sub-C
It is supplied to the PU 2-2 and the isolation circuit 3-2.
Upon receiving the supply of the local power supply PWR2, the A / D conversion circuit 1-2 converts the detection signal from the temperature sensor TC2 into a digital signal and sends it to the sub CPU 2-2. Sub CPU
2-2 generates transmission data from the input digital signal.
【００１３】一方、メインＣＰＵ４’は、発振選択信号
Ｓ２をデータセレクタ９へも送る。この発振選択信号Ｓ
２を受けて、データセレクタ９は、メインＣＰＵ４’か
らのラインＬ３を介する返送要求をアイソレーション回
路３−２を介してサブＣＰＵ２−２へ送る。サブＣＰＵ
２−２は、メインＣＰＵ４’からの返送要求に応えて、
送信データをアイソレーション回路３−２およびデータ
セレクタ９を介しラインＬ４を通してメインＣＰＵ４’
へ送る。メインＣＰＵ４’は、ドライバ回路５を駆動
し、その受信したサブＣＰＵ２−２からの送信データを
伝送路Ｌ２に流れる電流Ｉの変化として上位装置へ送
る。On the other hand, the main CPU 4'also sends the oscillation selection signal S2 to the data selector 9. This oscillation selection signal S
Upon receiving 2, the data selector 9 sends a return request from the main CPU 4 ′ via the line L3 to the sub CPU 2-2 via the isolation circuit 3-2. Sub CPU
2-2 responds to the return request from the main CPU 4 ',
The main CPU 4'transmits the transmission data through the isolation circuit 3-2 and the data selector 9 and the line L4.
Send to. The main CPU 4 ′ drives the driver circuit 5 and sends the received transmission data from the sub CPU 2-2 to the host device as a change in the current I flowing through the transmission line L2.
【００１４】以下、同様にして、メインＣＰＵ４’は、
発振選択信号Ｓ３，Ｓ４をローカル電源生成回路８−
３，８−４へ順次に送り、ローカル電源生成回路８−
３，８−４を順次に切り替えて作動させ、これにより順
次に生成されるローカル電源ＰＷＲ３，ＰＷＲ４をＡ／
Ｄ変換回路１−３，１−４、サブＣＰＵ２−３，２−
４、アイソレーション回路３−３，３−４へ供給し、サ
ブＣＰＵ２−３，２−４からの送信データを伝送路Ｌ２
に流れる電流Ｉの変化として順次に上位装置へ送る。そ
して、サブＣＰＵ２−４からの送信データを上位装置へ
送った後は、発振選択信号Ｓ１をローカル電源生成回路
８−１へ送り、上述した動作を繰り返す。Thereafter, similarly, the main CPU 4'is
Oscillation selection signals S3 and S4 are supplied to the local power supply generation circuit 8-
3, 8-4 to the local power generation circuit 8-
3, 8-4 are sequentially switched to operate, and local power sources PWR3, PWR4 sequentially generated by this are A /
D conversion circuits 1-3, 1-4, sub CPUs 2-3, 2-
4, the data is supplied to the isolation circuits 3-3 and 3-4, and the transmission data from the sub CPUs 2-3 and 2-4 is transmitted to the transmission line L2.
Is sent to the host device in sequence as a change in the current I flowing through the device. Then, after transmitting the transmission data from the sub CPU 2-4 to the host device, the oscillation selection signal S1 is transmitted to the local power supply generation circuit 8-1 and the above-described operation is repeated.
【００１５】以上の説明から分かるように、本実施例に
よる多点入力２線式伝送器１００’によれば、常時生成
されるメイン電源ＰＷＲM と順次切り替わって生成され
るローカル電源ＰＷＲ１〜ＰＷＲ４とが使用されるの
で、その作動電力としては１点入力の場合と同じ４ｍＡ
の電流で間に合い、上位装置において大容量の電源を必
要としないものとなる。また、本実施例によれば、上位
装置との間に２線の伝送路Ｌ１，Ｌ２を一つ敷設するの
みで４点の測定データを上位装置へ送ることができ、ケ
ーブルの敷設数の増大および敷設工数の増大によりコス
トがかかるという問題が生じず、非常に経済的となる。As can be seen from the above description, according to the multi-point input two-wire transmitter 100 'according to the present embodiment, the main power supply PWR M which is constantly generated and the local power supplies PWR1 to PWR4 which are sequentially switched and generated. Since it is used, its operating power is 4mA, which is the same as in the case of 1-point input.
Therefore, a high-capacity power supply is not required in the host device. Further, according to this embodiment, the measurement data at four points can be sent to the host device only by laying one two-wire transmission path L1, L2 between the host device and the host device, and the number of cables to be installed is increased. Also, there is no problem that the cost is increased due to an increase in the number of laying steps, which is very economical.
【００１６】なお、本実施例においては、ＴＣ１〜ＴＣ
４を温度センサとしたが、湿度センサ等を接続するもの
としてもよい。また、本実施例において、温度センサＴ
Ｃ１〜ＴＣ４を測温抵抗体とした場合には、測温抵抗体
に電流を流さなければならないので測定に際しての立ち
上がり時間をある程度必要とするが、これに対しては発
振選択信号Ｓ１〜Ｓ４の切替周期を長くすることによっ
て対応することができる。温度センサＴＣ１〜ＴＣ４を
熱電対とした場合には、検出信号が起電力として即座に
得られるので、発振選択信号Ｓ１〜Ｓ４の切替周期は短
くてもよい。In the present embodiment, TC1 to TC
Although 4 is a temperature sensor, a humidity sensor or the like may be connected. Further, in this embodiment, the temperature sensor T
When C1 to TC4 are used as the resistance temperature detector, a current needs to be passed through the resistance temperature detector, so a certain rise time is required for the measurement. For this, the oscillation selection signals S1 to S4 This can be dealt with by lengthening the switching cycle. When the temperature sensors TC1 to TC4 are thermocouples, the detection signal is immediately obtained as an electromotive force, so the switching cycle of the oscillation selection signals S1 to S4 may be short.
【００１７】[0017]
【発明の効果】以上説明したことから明らかなように本
発明によれば、常時生成されるメイン電源と順次切り替
わって生成されるローカル電源とが使用されるので、そ
の作動電力としては１点入力の場合と同じ電力で間に合
い、上位装置において大容量の電源を必要としないもの
となる。また、上位装置との間に２線の伝送路を一つ敷
設するのみで多点の測定データを上位装置へ送ることが
でき、ケーブルの敷設数の増大および敷設工数の増大に
よりコストがかかるという問題が生じず、非常に経済的
となる。As is apparent from the above description, according to the present invention, the main power source which is constantly generated and the local power source which is sequentially switched are used. The same electric power as in the above case can be used, and a high-capacity power source is not required in the host device. In addition, it is possible to send multipoint measurement data to the host device only by laying one transmission line of two lines between the host device and the cable, and it is costly due to an increase in the number of cable installations and man-hours. It is very economical without any problems.
【図１】本発明の一実施例を示す多点入力２線式伝送器
のブロック回路構成図である。FIG. 1 is a block circuit configuration diagram of a multipoint input two-wire transmitter showing an embodiment of the present invention.
【図２】従来の２線式伝送器のブロック回路構成図であ
る。FIG. 2 is a block circuit configuration diagram of a conventional 2-wire type transmitter.
１−１〜１−４ Ａ／Ｄ変換回路 ２−１〜２−４ サブＣＰＵ ３−１〜３−４ アイソレーション回路 ４’メインＣＰＵ ５ ドライバ回路 ７ メイン電源生成回路 ８−１〜８−４ ローカル電源生成回路 ９ データセレクタ ＴＣ１〜ＴＣ４ 温度センサ Ｌ１，Ｌ２ 伝送路 １００’多点入力２線式伝送器 1-1 to 1-4 A / D conversion circuit 2-1 to 2-4 Sub CPU 3-1 to 3-4 Isolation circuit 4'Main CPU 5 Driver circuit 7 Main power supply generation circuit 8-1 to 8-4 Local power generation circuit 9 Data selector TC1 to TC4 Temperature sensor L1, L2 Transmission path 100 'Multi-point input 2-wire type transmitter
Claims (1)
ィジタル信号に変換する第１〜第ＮのＡ／Ｄ変換手段
と、 この第１〜第ＮのＡ／Ｄ変換手段の変換したディジタル
信号を入力とし送信データを生成する第１〜第Ｎのサブ
演算処理手段と、 この第１〜第Ｎのサブ演算処理手段の生成する送信デー
タに対しての返送要求およびこの返送要求に応えて返送
される送信データをアイソレーションして伝送する第１
〜第Ｎのアイソレーション手段と、 ２線の伝送路からの電流の供給を受けてメイン電源を生
成するメイン電源生成手段およびローカル電源を生成す
る第１〜第Ｎのローカル電源生成手段と、 前記メイン電源生成手段の生成するメイン電源の供給を
受けて、前記第１〜第Ｎのローカル電源生成手段を順次
に切り替えて作動させ、この第１〜第Ｎのローカル電源
生成手段の生成するローカル電源を前記第１〜第ＮのＡ
／Ｄ変換手段，サブ演算処理手段およびアイソレーショ
ン手段へ供給すると共に、ローカル電源の供給されるサ
ブ演算処理手段へそのサブ演算処理手段の生成する送信
データに対しての返送要求を送り、この返送要求に応え
て返送されてくる送信データを受信し、この受信した送
信データを前記伝送路に流れる電流の変化として上位装
置へ送るメイン演算処理手段とを備えたことを特徴とす
る多点入力２線式伝送器。1. A first to Nth A / D conversion means for converting a detection signal from the first to Nth sensors into a digital signal, and a conversion of the first to Nth A / D conversion means. First to Nth sub arithmetic processing means for inputting a digital signal to generate transmission data, a return request for the transmission data generated by the first to Nth sub arithmetic processing means, and a response to this return request First to isolate and transmit the transmission data returned by
To Nth isolation means, main power generation means for generating main power by receiving current from the two-wire transmission line, and first to Nth local power generation means for generating local power; Receiving supply of main power generated by the main power generation means, the first to Nth local power generation means are sequentially switched to operate, and the local power generation generated by the first to Nth local power generation means The first to Nth A
The A / D conversion means, the sub-arithmetic processing means and the isolation means are supplied to the sub-arithmetic processing means, which is supplied with local power, and a return request for the transmission data generated by the sub-arithmetic processing means is sent. A multi-point input device 2 comprising: a main arithmetic processing means for receiving transmission data returned in response to a request and transmitting the received transmission data to a higher-level device as a change in current flowing in the transmission path. Wire transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05340379A JP3077076B2 (en) | 1993-12-09 | 1993-12-09 | Multi-point input 2-wire transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05340379A JP3077076B2 (en) | 1993-12-09 | 1993-12-09 | Multi-point input 2-wire transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07162345A true JPH07162345A (en) | 1995-06-23 |
| JP3077076B2 JP3077076B2 (en) | 2000-08-14 |
Family
ID=18336390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05340379A Expired - Lifetime JP3077076B2 (en) | 1993-12-09 | 1993-12-09 | Multi-point input 2-wire transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3077076B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1290513A2 (en) | 2000-05-12 | 2003-03-12 | Rosemount Inc. | Two-wire field-mounted process device |
| US7016741B2 (en) | 2003-10-14 | 2006-03-21 | Rosemount Inc. | Process control loop signal converter |
| JP2006170731A (en) * | 2004-12-15 | 2006-06-29 | Yamari Sangyo Kk | Temperature control system for temperature transmitter |
| US7228186B2 (en) | 2000-05-12 | 2007-06-05 | Rosemount Inc. | Field-mounted process device with programmable digital/analog interface |
| JP2007292588A (en) * | 2006-04-25 | 2007-11-08 | Yokogawa Electric Corp | Measuring system |
| JP2008312327A (en) * | 2007-06-13 | 2008-12-25 | Meidensha Corp | Analog input circuit of digital protection relay |
| WO2009096225A1 (en) * | 2008-01-31 | 2009-08-06 | Yamatake Corporation | Measurement instrument |
| US7844365B2 (en) | 2000-05-12 | 2010-11-30 | Rosemount Inc. | Field-mounted process device |
| US8311778B2 (en) | 2009-09-22 | 2012-11-13 | Rosemount Inc. | Industrial process control transmitter with multiple sensors |
| US9634858B2 (en) | 2005-07-20 | 2017-04-25 | Rosemount Inc. | Field device with power over Ethernet |
| US11159203B2 (en) | 2019-09-13 | 2021-10-26 | Micro Motion, Inc. | Process control loop bridge |
-
1993
- 1993-12-09 JP JP05340379A patent/JP3077076B2/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7844365B2 (en) | 2000-05-12 | 2010-11-30 | Rosemount Inc. | Field-mounted process device |
| US6961624B2 (en) | 2000-05-12 | 2005-11-01 | Rosemount Inc. | Two-wire field-mounted process device |
| US7228186B2 (en) | 2000-05-12 | 2007-06-05 | Rosemount Inc. | Field-mounted process device with programmable digital/analog interface |
| EP1290513A2 (en) | 2000-05-12 | 2003-03-12 | Rosemount Inc. | Two-wire field-mounted process device |
| EP1290513B1 (en) * | 2000-05-12 | 2010-10-20 | Rosemount Inc. | Two-wire field-mounted process device |
| EP2251754A1 (en) * | 2000-05-12 | 2010-11-17 | Rosemount, Inc. | Two-wire field-mounted process device |
| US7016741B2 (en) | 2003-10-14 | 2006-03-21 | Rosemount Inc. | Process control loop signal converter |
| JP2006170731A (en) * | 2004-12-15 | 2006-06-29 | Yamari Sangyo Kk | Temperature control system for temperature transmitter |
| US9634858B2 (en) | 2005-07-20 | 2017-04-25 | Rosemount Inc. | Field device with power over Ethernet |
| JP2007292588A (en) * | 2006-04-25 | 2007-11-08 | Yokogawa Electric Corp | Measuring system |
| JP2008312327A (en) * | 2007-06-13 | 2008-12-25 | Meidensha Corp | Analog input circuit of digital protection relay |
| JP2009180644A (en) * | 2008-01-31 | 2009-08-13 | Yamatake Corp | Measurement instrument |
| US8412471B2 (en) | 2008-01-31 | 2013-04-02 | Azbil Corporation | Measurement instrument |
| WO2009096225A1 (en) * | 2008-01-31 | 2009-08-06 | Yamatake Corporation | Measurement instrument |
| US8311778B2 (en) | 2009-09-22 | 2012-11-13 | Rosemount Inc. | Industrial process control transmitter with multiple sensors |
| US11159203B2 (en) | 2019-09-13 | 2021-10-26 | Micro Motion, Inc. | Process control loop bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3077076B2 (en) | 2000-08-14 |
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