JPH0513412B2 - - Google Patents
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- Publication number
- JPH0513412B2 JPH0513412B2 JP60025140A JP2514085A JPH0513412B2 JP H0513412 B2 JPH0513412 B2 JP H0513412B2 JP 60025140 A JP60025140 A JP 60025140A JP 2514085 A JP2514085 A JP 2514085A JP H0513412 B2 JPH0513412 B2 JP H0513412B2
- Authority
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- Japan
- Prior art keywords
- processing means
- slave station
- display
- circuit
- power
- 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.)
- Expired - Lifetime
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- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 11
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、遠方監視制御装置、特に遠方の無人
設備の停電監視を行つてなる遠方監視制御装置に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a remote monitoring and control device, and particularly to a remote monitoring and control device that monitors power outages of remote unmanned equipment.
従来の遠方監視制御装置には、特開昭58−
204649号に記載されたものがある。この従来例で
は、無人設備である子局に停電発生した場合、停
電時に充電していた停電用電源によつてトーン信
号発生回路を作動させ、その出力を切換回路を経
て親局に送出する構成をなす。
Conventional remote monitoring and control devices include
There is one described in No. 204649. In this conventional example, when a power outage occurs in a slave station, which is unmanned equipment, the tone signal generation circuit is activated by the power supply for power outage that was being charged at the time of the power outage, and its output is sent to the master station via a switching circuit. to do.
この従来例では、トーン信号発生回路を子局に
設ける必要があつた。 In this conventional example, it was necessary to provide a tone signal generation circuit in the slave station.
この従来例以外に、特定パターンの停電信号を
子局内部で作成回路によつて作成させる例もあ
る。この従来例でも、作成回路が必要であつた。 In addition to this conventional example, there is also an example in which a power outage signal of a specific pattern is created by a creation circuit inside the slave station. This conventional example also required a creation circuit.
子局の設備自体の小型化の要求から、子局の設
備の減少を必要としてきている。 Due to the demand for downsizing of the slave station equipment itself, it has become necessary to reduce the number of slave station equipment.
本発明は、少ない子局設備で子局停電の監視を
はかつてなる遠方監視制御装置を提供することを
目的とする。
SUMMARY OF THE INVENTION An object of the present invention is to provide a remote monitoring and control device that can monitor power outages in slave stations with a small number of slave station equipment.
本発明は、子局停電時の連絡信号を停電用電源
装置によつて直接に得、これを親局に送り停電検
出せしめることとしたことを要旨とする。
The gist of the present invention is that a communication signal in the event of a power outage in a slave station is directly obtained by a power supply device for power outage, and is sent to the master station to detect a power outage.
第１図は本発明の遠方監視制御装置の実施例図
を示す。子局は数多く存在し、親局との間で伝送
線２１によつて連続する。図では、１つの子局と
親局との関係を示す。
FIG. 1 shows an embodiment of the remote monitoring and control device of the present invention. There are many slave stations, which are connected to the master station via transmission lines 21. The figure shows the relationship between one slave station and a master station.
子局は、表示接点１、表示入力回路２、並列−
直列変換回路３、複流変換回路４、停電信号発生
回路１４、停電接点１３より成る。 The slave station has display contact 1, display input circuit 2, and parallel
It consists of a serial conversion circuit 3, a double current conversion circuit 4, a power failure signal generation circuit 14, and a power failure contact 13.
表示接点１は、制御対象（又は監視対象）の状
態を表示する接点であり、数10〜数100個の数に
達する。表示入力回路２は、この複数の接点情報
の取込みを行う。並列−直列変換回路３は、複数
の表示接点情報を直列化して１個宛出力する。こ
の１個宛の表示接点情報は、“１”又は“０”の
２値レベルより成る。例えば、接点開であれば
“０”、接点閉であれば“１”（この逆の約束毎も
当然あり）とする。 The display contacts 1 are contacts that display the status of a controlled object (or a monitored object), and number from several tens to several hundreds. The display input circuit 2 takes in this plurality of contact information. The parallel-to-serial conversion circuit 3 serializes a plurality of pieces of display contact information and outputs the serialized information to one piece. This display contact information addressed to one piece consists of a binary level of "1" or "0". For example, if the contact is open, it is set to "0", and if the contact is closed, it is set to "1" (of course, the opposite is also possible).
複流変換回路４は、“１”を＋48V、“０”を−
48Vの直流電圧に変換する。この±48Vによつて
“１”と“０”とを表現した。この±48Vは伝送
路２１での搬送振幅レベルとなる。 The double current conversion circuit 4 has “1” at +48V and “0” at –
Convert to 48V DC voltage. “1” and “0” were expressed by this ±48V. This ±48V becomes the carrier amplitude level in the transmission line 21.
停電信号発生回路１４は、停電のない正常電源
時には、複流変換回路４の出力を選択してそのま
ま伝送路２１に流す。停電発生時には、この旨を
接点１３の働きによつて知り、停電発生を指示す
る停電信号を伝送路２１に送出する。 The power failure signal generation circuit 14 selects the output of the double current conversion circuit 4 and sends it to the transmission line 21 as it is when the power supply is normal without a power failure. When a power outage occurs, this fact is known through the action of the contact 13, and a power outage signal instructing the occurrence of a power outage is sent to the transmission line 21.
電源正常時の伝送フオーマツトを第２図に示
す。サイクル単位で伝送が繰返す。１サイクル
は、同期ワードと、44ビツトを１ブロツクとする
ブロツクW1より成るｎ個のブロツクとをもつて
形成する。ブロツクの中味はデータであり、これ
は前述の入力接点情報等に対応する。同期ワード
は、“１”となる先頭ビツト、“１”となる終端ビ
ツト、及び先頭ビツトと終端ビツトとの間に介在
する複数個の“０”となるビツトとを持つて形成
する。“１”の振幅は、＋48V、“０”の振幅は−
48Vとなる。 Figure 2 shows the transmission format when the power supply is normal. Transmission repeats in cycles. One cycle is formed by a synchronization word and n blocks consisting of a block W1 of 44 bits. The contents of the block are data, which correspond to the input contact information and the like described above. A synchronization word is formed by having a first bit that becomes "1", a last bit that becomes "1", and a plurality of bits that become "0" interposed between the first bit and the last bit. The amplitude of "1" is +48V, the amplitude of "0" is -
It becomes 48V.
１ブロツクを形成する44ビツトは、前半22ビツ
トと後半22ビツトより成り、後半22ビツトは前半
22ビツトの反転データとなる。前半22ビツトは、
６ビツトのブロツク番号指示部と、データ部と、
パリテイビツト等より成る。 The 44 bits that form one block consist of the first 22 bits and the second 22 bits, and the latter 22 bits are the first half.
This is 22-bit inverted data. The first 22 bits are
A 6-bit block number instruction section, a data section,
Consists of parity bits, etc.
親局は、絶縁回路５、単流変換回路６、回線断
検出回路７、スペースホールド回路８、直列−並
列変換回路９、表示警報回路１０、表示器１１、
警報器１２、停電信号検出回路１５より成る。 The master station includes an isolation circuit 5, a single-current conversion circuit 6, a disconnection detection circuit 7, a space hold circuit 8, a series-parallel conversion circuit 9, a display alarm circuit 10, a display 11,
It consists of an alarm device 12 and a power failure signal detection circuit 15.
絶縁回路５は、トランスやフオトカプラ等より
成り、伝送路２１と親局側との電気的絶縁をはか
る。単流変換回路６は、±48Vの“１”，“０”信
号を、レベルの低い振幅のパルスレベルに変換す
る。直列−並列変換回路９は、スペースホールド
回路８を経てそのまま送られてくる単流変換回路
６の“１”，“０”のパルス出力を取込み並列化す
る。表示警報回路１０はその並列化出力を取込み
表示器１１へ表示させる。 The insulation circuit 5 is made up of a transformer, a photocoupler, etc., and provides electrical insulation between the transmission line 21 and the master station side. The single-current conversion circuit 6 converts the "1" and "0" signals of ±48V to a pulse level with a low level and amplitude. The serial-to-parallel conversion circuit 9 takes in the pulse outputs of "1" and "0" from the single current conversion circuit 6, which are sent as they are through the space hold circuit 8, and parallelizes them. The display alarm circuit 10 takes in the parallelized output and displays it on the display 11.
以上は正常時であるが、異常時には、２つの動
作を行う。第１は回線断の発生であり、回線断検
出回路７がこれを検出し、スペースホールド回路
８を制御し、スペース側にホールドを行い、その
旨の表示を表示警報回路１０を介して表示器１１
に表示させ、警報器１２に警報を発せさせる。 The above is a normal situation, but in an abnormal situation, two operations are performed. The first is the occurrence of line disconnection, and the line disconnection detection circuit 7 detects this, controls the space hold circuit 8, holds the space side, and displays an indication to that effect on the display via the alarm circuit 10. 11
display and cause the alarm device 12 to issue an alarm.
異常時の第２は、子局電源断の発生である。こ
の子局断の発生の検出は、停電信号検出回路１５
によつて行い、その結果は、表示警報回路１０を
介して警報器１２に警報させる。停電信号検出回
路１５は、子局から子局停電時に送られてくる停
電断表示信号を検出する。 The second abnormality is the occurrence of a slave station power cutoff. The occurrence of this slave station disconnection is detected by the power failure signal detection circuit 15.
The result is sent to the alarm device 12 via the display alarm circuit 10. The power failure signal detection circuit 15 detects a power failure indication signal sent from a slave station at the time of a slave station power failure.
第３図は、停電信号発生回路１４の実施例であ
る。停電信号発生回路１４は、ストラツプスイツ
チ１６、停電接点増幅リレー１７、増幅接点(A)１
８、増幅接点(B)１９、正常時充電コンデンサ１９
より成る。このコンデンサ１９は補助電源の役割
を持つ。 FIG. 3 shows an embodiment of the power outage signal generation circuit 14. The power failure signal generation circuit 14 includes a strap switch 16, a power failure contact amplification relay 17, and an amplification contact (A) 1.
8, Amplification contact (B) 19, Normal charging capacitor 19
Consists of. This capacitor 19 has the role of an auxiliary power source.
リレー１７が制御を司どる。正常時には、接点
１８，１９が図の如き方向に接触している。従つ
て、コンデンサ２０には、直流電圧（＋48V、又
は−48V）が充電されている。一方、接点１９を
介して複数変換回路４の接点情報対応のデータを
含む情報が伝送路２１に送出される。このデータ
とは、第２図に示す如きフオーマツトより成る。 Relay 17 takes charge of control. Under normal conditions, the contacts 18 and 19 are in contact in the direction shown in the figure. Therefore, the capacitor 20 is charged with a DC voltage (+48V or -48V). On the other hand, information including data corresponding to the contact information of the plurality of conversion circuits 4 is sent to the transmission path 21 via the contact 19 . This data consists of a format as shown in FIG.
尚、ストラツプスイツチ１６は、(1)側又は(2)側
のいずれかが選択によりONとなる。そのいずれ
かのONにより、コンデンサ２０には、＋48Vか−
48Vかのいずれかの電圧が充電される。 Note that the strap switch 16 is turned on by selecting either the (1) side or the (2) side. When either of them is turned on, the capacitor 20 receives +48V or -
Either voltage of 48V is charged.
停電発生時には、接点１３が閉じ、リレー１７
は、接点１８及び接点１９を図とは反対方向に切
替える。この接点状態のもとでは、コンデンサ２
０が停電表示信号源そのものとなる。即ち、伝送
路２１に、−48V（又は＋48V）の電圧を出力す
る。この−48V（又は＋48V）の電圧の継続が子
局電源断の表示信号となる。 When a power outage occurs, contact 13 closes and relay 17
switches the contacts 18 and 19 in the opposite direction to that shown. Under this contact condition, capacitor 2
0 is the power failure display signal source itself. That is, a voltage of -48V (or +48V) is output to the transmission line 21. Continuation of this voltage of -48V (or +48V) becomes an indication signal that the slave station power is turned off.
−48V（又は＋48V）の直流電圧を継続して送
つた場合、第２図に述べた同期ワードパターンの
中の先頭ビツトと終端ビツトとの間にある“０”
となる期間T0との異同をどうするかが問題とな
る。同期ワードは、正常時には必ず一定サイクル
毎にくるため、この同期ワード中の期間T0より
短い時間の直流電圧−48Vの継続をもつて子局電
源断と判定することはできない。従つて、電源断
とするときは、T0以上の−48Vの直流電圧の維
持期間T1を必要とする。このような容量となる
べくコンデンサ２０を選んでおく。 When a DC voltage of -48V (or +48V) is sent continuously, the "0" between the first bit and the last bit in the synchronization word pattern shown in Figure 2
The problem is what to do about the difference from the period T 0 . Since the synchronization word always comes at regular intervals during normal operation, it cannot be determined that the slave station power has been cut off if the DC voltage -48V continues for a period shorter than the period T0 during the synchronization word. Therefore, when the power is turned off, a period T1 for maintaining the DC voltage of -48V, which is greater than T0 , is required. The capacitor 20 is selected to have such a capacity.
但し、コンデンサ２０は、時間の流れに対して
第４図に示す如く放電による電圧降下がある。図
では、−48Vと＋48Vの両者の放電による電圧降
下を様子を示す。従つて、厳密に−48V（又は＋
48V）に維持させておく必要は必ずしもなく、親
局側での時間T1の判断のための基準電圧を、そ
の時間T1に併せて小さく設定させてもよい。 However, the capacitor 20 has a voltage drop due to discharge as shown in FIG. 4 over time. The figure shows the voltage drop due to discharge of both -48V and +48V. Therefore, strictly -48V (or +
It is not necessarily necessary to maintain the voltage at 48 V), and the reference voltage for determining the time T1 on the master station side may be set to a smaller value in accordance with the time T1 .
第５図は、停電検出回路１５の実施例を示す。
比較器２２，２３，２４、オアゲート２５、タイ
マー２６より成る。比較器２２は絶縁回路５の出
力が＋48Vと一致するか否かの検出を行い、比較
器２３は0Vと一致するか否かの検出を行い、比
較器２４は−48Vに一致するか否かの検出を行
う。 FIG. 5 shows an embodiment of the power failure detection circuit 15.
It consists of comparators 22, 23, 24, an OR gate 25, and a timer 26. Comparator 22 detects whether the output of isolation circuit 5 matches +48V, comparator 23 detects whether it matches 0V, and comparator 24 detects whether it matches -48V. Detection is performed.
第２図の説明から明らかなように、送出されて
くる各サイクル内の信号には、＋48Vと−48Vと
の信号がその送出内容に従つて現われてくる。従
つて、比較器２２，２４は、その送出内容に従つ
て一致出力を発生する。子局電源断の時にあつて
も、電源断の表示信号のレベル（−48Vか＋48V
か）に応じて比較器２４（又は２２）は一致出力
を発生する。 As is clear from the explanation of FIG. 2, +48V and -48V signals appear in the transmitted signals in each cycle according to the contents of the transmission. Therefore, comparators 22 and 24 generate matching outputs according to their sent contents. Even when the slave station power is cut off, the level of the power cut display signal (-48V or +48V
comparator 24 (or 22) generates a match output.
比較器２３は、0Vを検出する。0Vとは、回線
無電圧を意味する。この0Vは、回線断の時にも
発生するが、本回路にあつては、＋48V→−48V、
又は−48V→＋48Vへの移行過程での0Vクロス点
の検出に使用する。この＋48V，−48Vとは論理
上の“１”，“０”を意味するもの故、“１”から
“０”、“０”から“１”へのデータの変化過程に
0Vクロスが現われることになる。 Comparator 23 detects 0V. 0V means no line voltage. This 0V also occurs when the line is disconnected, but in this circuit, +48V → -48V,
Or use it to detect the 0V cross point during the transition process from -48V to +48V. These +48V and -48V mean logical "1" and "0", so the process of changing data from "1" to "0" and from "0" to "1"
A 0V cross will appear.
タイマー回路２６は、子局電源断の判定用の基
準継続時間T2でタイムアツプし、タイムアツプ
出力“１”を発生する。このタイマー回路２６
は、比較器２３の出力“１”、即ち比較器２３で
の0V検出値“１”によつてリセツトされる構成
をなす。 The timer circuit 26 times up at the reference duration T2 for determining whether the slave station is powered off, and generates a time-up output of "1". This timer circuit 26
is configured to be reset by the output "1" of the comparator 23, that is, the 0V detection value "1" from the comparator 23.
タイマー回路２６での基準継続時間T2とは、
第２図の同期ワードの“０”レベル期間T0に比
して、T2＞T0に設定してある。 The reference duration time T 2 in the timer circuit 26 is
Compared to the "0" level period T 0 of the synchronization word in FIG. 2, T 2 >T 0 is set.
動作を説明する。正常時には、絶縁回路５を介
して送出データを受取り、そのレベル＋48V，−
48Vに応じてタイマー回路２６はセツトアツプさ
れる。しかし、近い時間幅の中で0Vとクロス点
があるため、タイマー回路２６は、0Vクロス点
毎にリセツトされる。また同期ワード区間にあつ
ても、タイムアツプ時間T2がT2＞T0に設定され
る故に、タイマー回路２６がタイムアツプするこ
とはない。 Explain the operation. During normal operation, the transmitted data is received through the isolation circuit 5, and its level is +48V, -
The timer circuit 26 is set up in response to 48V. However, since there are cross points with 0 V within a close time range, the timer circuit 26 is reset at each 0 V cross point. Furthermore, even in the synchronization word section, the timer circuit 26 does not time up because the time-up time T 2 is set to T 2 >T 0 .
子局電源断発生時には、その断表示レベル−
48V（又は＋48V）によつて比較器２４（又は２
２）が一致信号を得、タイマー回路２６をセツト
アツプする。この一致信号がT0以上継続すれば、
タイマー回路２６はタイムアツプ信号“１”を出
力する。このタイムアツプ信号“１”は、警報表
示回路１０に送られ、警報器１２で子局電源断の
旨の警報を行わせ、且つ表示器１１にその表示を
行わせる。 When a slave station power failure occurs, the power failure indication level -
Comparator 24 (or 2
2) obtains a match signal and sets up the timer circuit 26. If this matching signal continues for T 0 or more,
The timer circuit 26 outputs a time-up signal "1". This time-up signal "1" is sent to the alarm display circuit 10, causing the alarm 12 to issue an alarm to the effect that the slave station power has been cut off, and causing the display 11 to display the same.
第６図には、停電信号検出回路１５でのタイム
チヤートを示す。タイムアツプ基準時間T2内に
子局の電源コンデンサ２０の電圧が若干低下する
ものとしている。この低下は、比較器２２（又は
２４）での許容範囲としてもよく、又は比較のた
めの基準値を＋48Vより若干低下させておくと
か、−48Vより若干プラス方向にさせておくとか
によつて対応可能である。かかる電源断に対し
て、比較器２２は、基準値より低下するまでの区
間T3でハイレベルとなる一致出力“１”を発生
する。タイマー回路２６は、時間巾T2でタイム
アツプし、子局断検出信号“１”を発生する。 FIG. 6 shows a time chart in the power outage signal detection circuit 15. It is assumed that the voltage of the power supply capacitor 20 of the slave station drops slightly within the time-up reference time T2 . This drop may be set within the allowable range of the comparator 22 (or 24), or the reference value for comparison may be slightly lower than +48V or slightly more positive than -48V. It is possible. In response to such a power outage, the comparator 22 generates a coincidence output "1" which becomes high level in the interval T3 until the power decreases below the reference value. The timer circuit 26 times out with a time width T2 and generates a slave station disconnection detection signal "1".
第７図は、１ワード内データ例を示す。信号は
＋48V〜0V〜−48Vを繰返している。第８図は回
線断状態を示す。0Vが維持される。この0Vによ
る回線断は、検出回路７によつて検出される。第
９図は停電時の指示信号の様子を示す。 FIG. 7 shows an example of data within one word. The signal is repeating +48V ~ 0V ~ -48V. FIG. 8 shows a line disconnection state. 0V is maintained. This line disconnection due to 0V is detected by the detection circuit 7. FIG. 9 shows the state of the instruction signal during a power outage.
以上の実施例では、補助電源としてコンデンサ
を使用したが、充電形の電源であればよい。尚、
補助電源とは、停電時のバツクアツプ用の意味を
持つことが一般的であるが、本発明にとつては、
この他に、停電表示信号としての役割のみを持た
せるとの意味をも有する。 In the above embodiments, a capacitor was used as the auxiliary power source, but any rechargeable power source may be used. still,
An auxiliary power source is generally used for backup during power outages, but for the present invention,
In addition to this, it also has the meaning of having only the role of a power outage indicating signal.
本発明によれば、停電時の停電電源の電圧をそ
のまま直接に子局電源断の指示信号として利用で
きた。回路構成も簡単化できた。
According to the present invention, the voltage of the power supply during a power outage can be directly used as an instruction signal to turn off the slave station power. The circuit configuration was also simplified.
第１図は本発明の実施例図、第２図は伝送フオ
ーマツト、第３図は停電信号発生回路の実施例
図、第４図は電源コンデンサの放電による電圧降
下の説明図、第５図は停電検出回路の実施例図、
第６図はその動作波形例図、第７図は１ワード内
データフオーマツト例図、第８図は回転断の波形
図、第９図は停電信号波形図である。
１４……停電信号発生回路、１５……停電検出
回路。
Fig. 1 is an embodiment of the present invention, Fig. 2 is a transmission format, Fig. 3 is an embodiment of a power failure signal generation circuit, Fig. 4 is an explanatory diagram of voltage drop due to discharge of a power supply capacitor, and Fig. 5 is an illustration of an embodiment of the power supply capacitor. An example diagram of a power outage detection circuit,
FIG. 6 is an example of the operation waveform, FIG. 7 is an example of the data format within one word, FIG. 8 is a waveform diagram of a rotation break, and FIG. 9 is a power failure signal waveform diagram. 14... Power outage signal generation circuit, 15... Power outage detection circuit.
Claims (1)
号伝送をサイクル単位に行うと共に、各サイクル
にあつては先頭に同期ワードを付加し、その後に
データ類を付加した構成のフレームとしてなる遠
方監視制御装置において、 子局は、電源断時の補助電源と、監視制御対象
からの入力接点情報を並列化し、複流化する処理
手段と、正常時には処理手段の出力を伝送路に送
出し、電源断時には上記補助電源の電圧を上記処
理手段の出力に代つて送出せしめる送出手段とよ
り成り、 親局は、伝送路を介して取込む信号を単流化
し、並列化する処理手段と、該処理手段の出力を
表示、警報する表示・警報器と、伝送路からの信
号中の同期ワード内同一振幅レベルの継続時間以
上、上記補助電源の電圧相当値が継続したことを
検出する検出器と、該検出信号を上記表示・警報
器に入力せしめて子局電源断表示・警報を行わせ
る手段とより成る、 遠方監視制御装置。 ２ 上記補助電源は充電形電源とし、充電は電源
正常時に行わせてなる特許請求の範囲第１項記載
の遠方監視制御装置。[Claims] 1. It has a master station and a slave station, and signals are transmitted on a transmission path between the two stations in units of cycles, and a synchronization word is added to the beginning of each cycle, and then In a remote monitoring and control device configured as a frame with added data, the slave station has an auxiliary power source when the power is cut off, a processing means that parallelizes the input contact information from the monitoring control target and converts it into double current, and a processing means that processes it during normal operation. The main station transmits the output of the processing means to the transmission line, and sends out the voltage of the auxiliary power supply in place of the output of the processing means when the power is cut off. A processing means for parallelizing and parallelizing processing means, a display/alarm device for displaying and alarming the output of the processing means, and a voltage equivalent value of the above auxiliary power supply for a duration longer than the duration of the same amplitude level in the synchronization word in the signal from the transmission line. A remote monitoring and control device comprising: a detector for detecting the continuation of the above-described condition; and means for inputting the detection signal to the display/alarm device to issue a power-off display/alarm for the slave station. 2. The remote monitoring and control device according to claim 1, wherein the auxiliary power source is a rechargeable power source, and charging is performed when the power source is normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60025140A JPS61186042A (en) | 1985-02-14 | 1985-02-14 | Remote supervisory and controlling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60025140A JPS61186042A (en) | 1985-02-14 | 1985-02-14 | Remote supervisory and controlling equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61186042A JPS61186042A (en) | 1986-08-19 |
| JPH0513412B2 true JPH0513412B2 (en) | 1993-02-22 |
Family
ID=12157671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60025140A Granted JPS61186042A (en) | 1985-02-14 | 1985-02-14 | Remote supervisory and controlling equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61186042A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07420A (en) * | 1993-01-28 | 1995-01-06 | Atd Sarl | Method and apparatus for removing a crown from a tooth carrying the crown without damaging the crown |
-
1985
- 1985-02-14 JP JP60025140A patent/JPS61186042A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07420A (en) * | 1993-01-28 | 1995-01-06 | Atd Sarl | Method and apparatus for removing a crown from a tooth carrying the crown without damaging the crown |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61186042A (en) | 1986-08-19 |
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