JPH03157096A - Industrial process transmitter - Google Patents
Industrial process transmitterInfo
- Publication number
- JPH03157096A JPH03157096A JP29661989A JP29661989A JPH03157096A JP H03157096 A JPH03157096 A JP H03157096A JP 29661989 A JP29661989 A JP 29661989A JP 29661989 A JP29661989 A JP 29661989A JP H03157096 A JPH03157096 A JP H03157096A
- Authority
- JP
- Japan
- Prior art keywords
- output
- signal
- current
- fault
- signal line
- 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
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- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000005856 abnormality Effects 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000002159 abnormal effect Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
この発明は、工業プラント等で使用される工業プロセス
伝送器に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an industrial process transmitter used in industrial plants and the like.
（ロ）従来の技術
一般に知られた工業プロセス伝送器は、流量や圧力等の
プロセス量を入力信号として受け、デジタル信号に変換
してＣＰＵに取り込み、ＣＰＵから出力される信号を増
幅器で電圧／電流変換し、出力信号線に４〜２０ｍＡの
電流信号として出力するものがある。この種のプロセス
伝送器において、入力信号異常やＣＰＵ （マイクロプ
ロセッサ）等の異常を自己診断する機能、さらに電流出
力について、通信用端末器を出力信号線に接続し、這信
用端末器からの指令によって指定された電流出力を行う
ループチエツク機能を備えたものがある。(B) Conventional technology Generally known industrial process transmitters receive process quantities such as flow rate and pressure as input signals, convert them into digital signals and input them into a CPU, and convert the signals output from the CPU into voltage/voltage signals using an amplifier. There is one that converts the current and outputs it as a 4 to 20 mA current signal to the output signal line. This type of process transmitter has a function for self-diagnosing input signal abnormalities and abnormalities in the CPU (microprocessor), etc., and also for current output, by connecting a communication terminal to the output signal line and receiving commands from the communication terminal. Some devices are equipped with a loop check function that outputs a current specified by .
（ハ）発明が解決しようとする課題
従来のプロセス伝送器では、上記したように入力信号異
常、ＣＰＵ異常等のチエツク機能、さらには指定された
電流出力を通信用端末器を用いて行うループチエツク機
能を備えたものはあるが、電流出力の異常を検出する機
能を備えたものはない。したがって、例えば落雷などに
よって電流出力に異常が起きても、これを自己診断する
ことができなかった。しかし、これでは、異常な信号が
受信計器やコントローラに送られても直ちに伝送器の異
常が発見できず、制御系に大きな悪影響を与えることに
なる。もちろん電流出力の異常を検出するために、電流
を検出すればよいが、通常の方法で電流を検出するとな
ると、電流／電圧変換回路、アイソレータ、Ａ／Ｄ変換
器が必要となり、回路が複雑化し、伝送器全体の価格を
上昇させるという問題がある。(c) Problems to be Solved by the Invention Conventional process transmitters, as described above, have a check function for input signal abnormalities, CPU abnormalities, etc., and a loop check function that uses a communication terminal to output a specified current. Although there are some that have this function, there is no one that has the ability to detect abnormalities in current output. Therefore, even if an abnormality occurs in the current output due to a lightning strike, for example, it has not been possible to self-diagnose this. However, in this case, even if an abnormal signal is sent to a receiving instrument or a controller, an abnormality in the transmitter cannot be detected immediately, which has a large adverse effect on the control system. Of course, detecting current is sufficient to detect an abnormality in current output, but detecting current using the normal method requires a current/voltage conversion circuit, an isolator, and an A/D converter, making the circuit complicated. , there is a problem of increasing the price of the entire transmitter.
この発明は、上記問題点に着目してなされたものであっ
て比較的簡単な構成で電流出力の異常を検出し報知し得
る工業プロセス伝送器を堤供することを目的としている
。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an industrial process transmitter that can detect and notify an abnormality in current output with a relatively simple configuration.
（ニ）課題を解決するための手段及び作用この発明の工
業プロセス伝送器は、電流出力信号線に通信用端末器を
、接続することにより、この通信用端末器からの指令を
デジタル信号として前記電流出力信号線に重畳し、その
デジタル信号を検出し、運転条件を確率する一方、入力
されるプロセス量の測定値を前記通信用端末器にデジタ
ル信号で送出する手段を備えたものにおいて、前記電流
出力信号線の状態を監視する手段と、この監視手段で異
常を検出した場合に、外部に電流出力異常を報知する手
段とを備えている。(d) Means and Effects for Solving the Problems The industrial process transmitter of the present invention connects a communication terminal to the current output signal line, thereby converting commands from the communication terminal into digital signals. The device includes means for superimposing the digital signal on the current output signal line, detecting the digital signal, and determining the operating conditions, while transmitting the input process quantity measurement value to the communication terminal in the form of a digital signal. The apparatus includes means for monitoring the state of the current output signal line, and means for notifying the outside of the current output abnormality when the monitoring means detects an abnormality.
この工業プロセス伝送器では、監視手段で電流出力信号
線の状態が監視され、この監視手段で異常が検出される
と、その旨、つまり電流出力異常が直ちに外部に報知手
段によって報知される。In this industrial process transmitter, the state of the current output signal line is monitored by the monitoring means, and when an abnormality is detected by the monitoring means, this fact, that is, the current output abnormality is immediately notified to the outside by the notification means.
（ホ）実施例
以下、実施例により、この発明をさらに詳細に説明する
。(E) Examples The present invention will be explained in more detail with reference to Examples below.
第１図は、この発明の一実施例を示すプロセス伝送器の
ブロック図である。同図において伝送器１は、アナログ
の入力信号を受けてデジタル信号に変換するＡ／Ｄ変換
器１１、このＡ／Ｄ変換器１１からのデジタル信号を取
り込むＣＰＵ１２、このＣＰＵＩ ２から人力信号の大
きさに応じた指令を受け、入力信号の大きさに応じたパ
ルス幅信号を出力するＰＷＭ波発生回路１３、このＰＷ
Ｍ波発生回路１３からのパルス幅信号を入出力で電気的
に絶縁して出力するホトカブラ１４、ホトカプラ１４の
ＰＷＭ波信叶を整流する整流回路１５、この整流回路１
５からの直流信号が人力され、電圧／電流変換して出力
する電流出力アンプ１６、この出力アンプ１６よりの４
〜２０ｍＡの出力電流を受信計器２に導く出力信号綿１
７．１７に接続される電流出力端子１８．１８、メモリ
１９、ＣＰＵ１２からの送信データをシリアル信号に変
換し、あるいは受信信号をシリアルからパラレルに変換
してＣＰＵＩ ２に取り込む入出力インタフェース２０
、この入出力インタフェース２０からの信号を変８１Ｈ
シ、あるいは受信信号を復調するモデム２１、フォトカ
プラ２２、このフォトカプラ２２からの送信データを出
力する送信回路２３、出力信号綿１８．１８からのデジ
タル信号を受信する受信回路２／Ｉ、送信回路２３の出
力と、出力信号綿１７を通して受信計器２よりフィード
バンクされた信号とをトヒ較する信号比較回路２５、こ
の信号比較回路２５の出力をＣＰＵ１２に取り込むため
の入力ゲート２６、この入力ゲート２６からの不一致信
号を取り込むと、これに応じた信号をＣＰＵＩ２より受
ける出力ゲート２７、この出力ゲート２７の信号出力に
応答して動作するリレー２８及びリレー２８の動作出力
により異常信号を出力する端子２９．２９を備えている
。FIG. 1 is a block diagram of a process transmitter showing one embodiment of the present invention. In the figure, the transmitter 1 includes an A/D converter 11 that receives an analog input signal and converts it into a digital signal, a CPU 12 that takes in the digital signal from the A/D converter 11, and a human input signal from the CPU 2. The PWM wave generation circuit 13 receives a command according to the magnitude of the input signal and outputs a pulse width signal according to the magnitude of the input signal.
A photocoupler 14 that electrically insulates and outputs the pulse width signal from the M-wave generation circuit 13 at input and output, a rectifier circuit 15 that rectifies the PWM wave signal of the photocoupler 14, and this rectifier circuit 1.
A current output amplifier 16 receives the DC signal from 5 manually, converts it into voltage/current, and outputs it, and 4 from this output amplifier 16.
Output signal wire 1 that leads an output current of ~20mA to receiving instrument 2
Current output terminal 18.18 connected to 7.17, memory 19, input/output interface 20 that converts the transmission data from the CPU 12 into a serial signal or converts the received signal from serial to parallel and imports it into the CPUI 2.
, change the signal from this input/output interface 20 81H
or a modem 21 that demodulates the received signal, a photocoupler 22, a transmission circuit 23 that outputs the transmission data from the photocoupler 22, a reception circuit 2/I that receives the digital signal from the output signal 18.18, and a transmission A signal comparison circuit 25 that compares the output of the circuit 23 with the signal fed from the receiving instrument 2 through the output signal line 17, an input gate 26 for taking the output of this signal comparison circuit 25 into the CPU 12, and this input gate. 26, an output gate 27 receives a corresponding signal from the CPU 2, a relay 28 operates in response to the signal output of the output gate 27, and a terminal outputs an abnormal signal by the operation output of the relay 28. 29.29.
この実施例プロセス伝送器において、運転条件を確立す
る場合には、出力信号綿１７．１７に通信用端末器（ハ
ンドベルトコミュニケータ）を接続し、この通信端末器
からの指令をデジタル信号で入力する。このデジタル信
号は受信回路２４、フォトカプラ２２、モデム２Ｉ、シ
リアル入出力インタフェース２０を介してＣＰＵ１２に
取り込まれる。In this embodiment of the process transmitter, when establishing operating conditions, connect a communication terminal (hand belt communicator) to the output signal line 17 and 17, and input commands from this communication terminal as a digital signal. do. This digital signal is taken into the CPU 12 via the receiving circuit 24, photocoupler 22, modem 2I, and serial input/output interface 20.
入力信号は、Ａ／Ｄ変換器１１でデジタル信号に変換さ
れてＣＰＵ１２に取り込まれる。ＣＰＵ１２では、取り
込んだ入力信号の大きさに応じてＰＷＭ波発生回路１３
に指令を与える。ＰＷＭ波発生回路１３は、入力信号の
大きさに応じたパルス幅信号を出力し、フォトカプラ１
４を介して、整流回路１５に加える。整流回路１５では
パルス幅信号を直流電圧に整流平滑し、電流出力アンプ
１６に入力する。不；滓出力アンプ１６は人力された電
圧を電流に変換し、電流出力端子１８．１８を介して出
力信号線１７．１７に４〜２０ｍＡの出力電流を流す。The input signal is converted into a digital signal by the A/D converter 11 and taken into the CPU 12. The CPU 12 operates the PWM wave generation circuit 13 according to the magnitude of the input signal taken in.
give commands to. The PWM wave generation circuit 13 outputs a pulse width signal according to the magnitude of the input signal, and the photocoupler 1
4 to the rectifier circuit 15. The rectifier circuit 15 rectifies and smoothes the pulse width signal into a DC voltage, which is input to the current output amplifier 16 . The output amplifier 16 converts the manually applied voltage into a current, and supplies an output current of 4 to 20 mA to the output signal line 17.17 via the current output terminal 18.18.
この出力信号線１７．１７に流れる主情波形を第２図の
ａに示している。The main signal waveform flowing through this output signal line 17.17 is shown in FIG. 2a.
一方、ＣＰＵ１２から所定の周期毎に出力されるデジタ
ルの送信信号（第２図のｂ参照）は、シリアル入出力イ
ンタフェース２０でシリアル信号に変換され、モデムで
変調され、フォトカプラ２２を経て、送信回路２３より
電流出力アンプ１６に入力される。電流出力アンプ１６
では上記した入力信号に対応した出力電流ａにデジタル
信号すが重畳された電流、が出力され、出力信号線１７
．１７には、第２図のＣに示す波形の電流が出力される
。On the other hand, a digital transmission signal (see b in FIG. 2) output from the CPU 12 at predetermined intervals is converted into a serial signal by the serial input/output interface 20, modulated by the modem, and sent via the photocoupler 22. The current is input from the circuit 23 to the current output amplifier 16. Current output amplifier 16
Then, a current obtained by superimposing a digital signal on the output current a corresponding to the input signal described above is output, and the output signal line 17
．． 17, a current having a waveform shown in C in FIG. 2 is output.
通信端末器が接続された時の、あるいは受信計器２から
の受信信号は受信回路２４、フォトカプラ２２を経て、
モデム２１に人力され、モデム２１で復調され、シリア
ル入出力インタフェース２０では、パラレル信号に変換
されて、ＣＰＵ１２に送られる。When the communication terminal device is connected, or the received signal from the receiving instrument 2 passes through the receiving circuit 24 and the photocoupler 22,
The signal is input to the modem 21, demodulated by the modem 21, converted into a parallel signal by the serial input/output interface 20, and sent to the CPU 12.
上記のように、ＣＰＵ１２は、出力電流の監視のため、
一定の周期毎にシリアル入出力インタフェース２０から
送信回路２３を遡して一定の信号を出力し、送信回路２
４の出力信号と、電流出力アンプ１６より、 出力信号
線１７を経て、受信計器２に出力し、さらにフィードバ
ックされてきた信号とを信号比較回路２５に入力し、両
者を比較し、送信された信号がフィードバックされて受
信されたかどうかを検出し、両信号が一致すれば異常な
しとするか、例えば出力信号線の断線等で、両信号が−
敗しなければ電流出力異常であるとして、入力ゲート２
６、ＣＰＵ１２、出力ゲート２７を通して異常信号を出
力し、リレー２日を動作させて、異常出力端子２９．２
９より外部に出力電流異常を報知する。As mentioned above, in order to monitor the output current, the CPU 12
A fixed signal is output from the serial input/output interface 20 to the transmitting circuit 23 at regular intervals, and the transmitting circuit 2
The output signal of 4 and the signal outputted from the current output amplifier 16 to the receiving instrument 2 via the output signal line 17 and further fed back are input to the signal comparison circuit 25, and the two are compared and the transmitted signal is It detects whether the signal is fed back and received, and if both signals match, it is considered that there is no abnormality, or if the output signal line is disconnected, for example, both signals are negative.
If it does not fail, it is assumed that the current output is abnormal, and the input gate 2
6. The CPU 12 outputs an abnormal signal through the output gate 27, operates the relay 2, and connects the abnormal output terminal 29.2.
9 notifies the outside of the output current abnormality.
（へ）発明の効果
この発明によれば、電流出力信号線の状態を監視する手
段と、この監視手段で異常を検出した場合に、外部に電
流出力異常を報知する手段とを備えるものであるから、
電流出力の異常が生した場合、その旨が直ちに外部出力
されるので、受信計器、コントローラ側で、この異常信
号を受けて、制御系を安全サイドに切り替えれば、制御
系に与えるダメージが少なくてすむ。複雑な回路を追加
することなく、異常検出を行うことができる。受信計器
に影響を与えろことなく、異常診断が行える 等の利点
がある。(f) Effects of the Invention According to the present invention, the device includes means for monitoring the state of the current output signal line, and means for notifying the outside of the current output abnormality when the monitoring means detects an abnormality. from,
If an abnormality occurs in the current output, that fact is immediately output externally, so if the receiving instrument or controller receives this abnormal signal and switches the control system to the safe side, damage to the control system can be minimized. I'm done. Abnormality detection can be performed without adding complicated circuits. It has the advantage of being able to diagnose abnormalities without affecting the receiving instrument.
第１図は、この発明の−Ｔ施例を示すプロセス伝送器の
ブロック図、第２図は、同プロセス伝送器の出力電流波
形を示す図である。
１２：ＣＰＵ、 １６：電流出力アンプ、１７：
出力信号線、 ２３：送信回路、２４：受信回路、
２５：信号比較回路、２９：異常出力端子。
第２図FIG. 1 is a block diagram of a process transmitter showing a -T embodiment of the present invention, and FIG. 2 is a diagram showing an output current waveform of the same process transmitter. 12: CPU, 16: Current output amplifier, 17:
Output signal line, 23: transmitting circuit, 24: receiving circuit,
25: Signal comparison circuit, 29: Abnormal output terminal. Figure 2
Claims (1)
より、この通信用端末器からの指令をデジタル信号とし
て前記電流出力信号線に重畳し、そのデジタル信号を検
出し、運転条件を確立する一方、入力されるプロセス量
の測定値を前記通信用端末器にデジタル信号で送出する
手段を備えた工業プロセス伝送器において、 前記電流出力信号線の状態を監視する手段と、この監視
手段で異常を検出した場合に、外部に電流出力異常を報
知する手段とを備えたことを特徴とする工業プロセス伝
送器。(1) By connecting a communication terminal to the current output signal line, the command from this communication terminal is superimposed on the current output signal line as a digital signal, the digital signal is detected, and the operating conditions are established. On the other hand, in an industrial process transmitter equipped with a means for transmitting an input process quantity measurement value to the communication terminal device in the form of a digital signal, means for monitoring the state of the current output signal line, and a means for monitoring the state of the current output signal line; An industrial process transmitter characterized by comprising means for notifying an external device of a current output abnormality when an abnormality is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29661989A JPH03157096A (en) | 1989-11-15 | 1989-11-15 | Industrial process transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29661989A JPH03157096A (en) | 1989-11-15 | 1989-11-15 | Industrial process transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03157096A true JPH03157096A (en) | 1991-07-05 |
Family
ID=17835892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29661989A Pending JPH03157096A (en) | 1989-11-15 | 1989-11-15 | Industrial process transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03157096A (en) |
-
1989
- 1989-11-15 JP JP29661989A patent/JPH03157096A/en active Pending
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