JPH04253212A - Remote time setting system - Google Patents
Remote time setting systemInfo
- Publication number
- JPH04253212A JPH04253212A JP3009490A JP949091A JPH04253212A JP H04253212 A JPH04253212 A JP H04253212A JP 3009490 A JP3009490 A JP 3009490A JP 949091 A JP949091 A JP 949091A JP H04253212 A JPH04253212 A JP H04253212A
- Authority
- JP
- Japan
- Prior art keywords
- time
- station
- data
- slave station
- master station
- 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
Links
- 238000004891 communication Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 7
- 230000001934 delay Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 1
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Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は遠隔時刻設定方式に関し
、特に主局と従局とが遅延のある通信回線で接続され、
主局の時計に従局の時計を合わせる遠隔時刻設定方式に
関する。[Industrial Field of Application] The present invention relates to a remote time setting system, and in particular, in which a master station and a slave station are connected via a communication line with a delay.
This invention relates to a remote time setting method for setting the master station's clock and the slave station's clock.
【０００２】0002
【従来の技術】図３は従来の遠隔時刻設定方式の一例の
システムブロック図である。2. Description of the Related Art FIG. 3 is a system block diagram of an example of a conventional remote time setting method.
【０００３】図３に示すように、内部に時計を持つ、主
局Ｍと、複数の従局Ｓ（１〜ｎ）が、通信回線の遅延△
Ｔｎを持つ通信回線で接続されており、従局Ｓの時計が
示す時刻を、それぞれＴ１〜ＴＮとし、従局に通信回線
で、主局Ｍの時計Ｔ０の時刻を送ることにより従局の時
計Ｔ１〜ＴＮの時刻を設定する。As shown in FIG. 3, a master station M, which has an internal clock, and a plurality of slave stations S (1 to n) are connected to a communication line delay △.
The clocks of the slave stations S are connected by a communication line with Tn, and the time indicated by the clock of the slave station S is T1 to TN, respectively. By sending the time of the clock T0 of the master station M to the slave station via the communication line, the clocks of the slave station S are set as T1 to TN. Set the time.
【０００４】以下に、従来例を図４を用いて説明する。
主局Ｍは時刻Ｔ０において時刻データＴ０を、遅延△Ｔ
ｎの通信回線を通じ従局Ｓに送る。従局Ｓでは、受け取
ったデータ値により、自分の時計の時刻ＴｎをＴ０に設
定し直す（Ｔｎ→Ｔ０）。A conventional example will be explained below using FIG. 4. The master station M transmits the time data T0 at time T0 with a delay △T
It is sent to the slave station S through the communication line of n. The slave station S resets the time Tn of its own clock to T0 based on the received data value (Tn→T0).
【０００５】このようにして、各従局Ｓに対し、主局Ｍ
の時刻Ｔ０の順次設定していく。ただし、従局Ｓが時刻
ＴｎをＴ０に設定し直した時、主局Ｍの時計では時刻は
、Ｔ０＋△Ｔｎになっており、△Ｔｎの誤差の範囲で、
主局と同時刻に設定されたことになる。In this way, for each slave station S, the master station M
The time T0 is sequentially set. However, when the slave station S resets the time Tn to T0, the time on the clock of the master station M is T0 + △Tn, and within the error range of △Tn,
This means that the time is set at the same time as the main station.
【０００６】[0006]
【発明が解決しようとする課題】この従来の遠隔時刻設
定方式では、主局Ｍの時計の時刻Ｔ０と従局Ｓの時計の
時刻Ｔｎが、△Ｔｎの誤差をもって設定されることを考
慮しなければならない。すなわち、各従局Ｓの時刻Ｔ０
は、実際に主局Ｍの時計ではＴ０＋△Ｔｎ時刻となり、
時刻差が△Ｔｎ発生する。例えば、各従局Ｓからデータ
を収集し、データを発生時刻付きで主局に通信回線を用
い送る場合において、従局Ｓにおいて同一時刻Ｔ０にデ
ータが発生したとしても、Ｓ（１）の時計ではＴ０−△
Ｔｎ、Ｓ（２）の時計ではＴ０−△Ｔｎに発生したこと
になり、発生時刻の異なるデータとして、処理されると
いう問題点があり、この通信遅延△Ｔｎは、測定時刻の
違いで変化する可能性があり、予め、△Ｔｎを測定して
おき、設定時に考慮する、などの対策はとれないという
問題点があった。[Problem to be Solved by the Invention] In this conventional remote time setting method, it must be taken into account that the time T0 of the clock of the master station M and the time Tn of the clock of the slave station S are set with an error of ΔTn. It won't happen. That is, the time T0 of each slave station S
is actually T0+△Tn time on the clock of main station M,
A time difference of ΔTn occurs. For example, when data is collected from each slave station S and sent to the master station with the time of occurrence using a communication line, even if the data is generated at the same time T0 at the slave station S, the clock at S(1) is at T0. −△
With the clock Tn, S(2), the occurrence occurs at T0-△Tn, and there is a problem in that it is processed as data with different occurrence times, and this communication delay △Tn changes depending on the difference in measurement time. There is a problem that it is not possible to take countermeasures such as measuring ΔTn in advance and taking it into consideration when making settings.
【０００７】[0007]
【課題を解決するための手段】本発明の遠隔時刻設定方
式は、主局と複数の従局とが遅延のある回線で接続され
前記主局の時計に従局の時計を合わせる遠隔時刻設定方
式において、前記主局から時刻Ｔａのデータを送出する
手段と、前記従局で前記回線からのデータが受信された
時刻Ｔｂを記憶する手段と、前記従局の時刻Ｔｅと記憶
された時刻Ｔｂとのデータを前記回線で前記主局に返送
する手段と、前記主局で返送されたデータが受信された
時刻Ｔｃ及び時刻Ｔｅ，Ｔｈを記憶する手段と、前記時
刻Ｔａ，Ｔｂ，Ｔｃ及びＴｅの関係により通信遅延を除
き前記主局と従局間の時刻のずれを補正時間Ｔｄとして
算出する手段と、前記補正時間Ｔｄをもとに前記従局の
時刻を補正する手段とを有する。[Means for Solving the Problems] The remote time setting method of the present invention is a remote time setting method in which a master station and a plurality of slave stations are connected by a line with a delay, and the clock of the master station is adjusted to the clock of the slave stations. means for transmitting data at time Ta from the master station; means for storing time Tb at which the slave station received data from the line; and means for storing data at time Te at the slave station and the stored time Tb. A means for sending data back to the main station via a line, a means for storing the time Tc and times Te and Th at which the data returned by the main station were received, and a communication delay due to the relationship between the times Ta, Tb, Tc and Te. and means for calculating the time difference between the master station and the slave station as a correction time Td, and means for correcting the time of the slave station based on the correction time Td.
【０００８】[0008]
【作用】本発明では、以下のような方法で主局と従局の
時刻のずれを補正し、主局の時刻を従局に設定する。い
ま図３に示すような、従来と同様な構成において、主局
Ｍの時刻がＴａのとき従局Ｓの時刻Ｔｎは、Ｔｎ＝Ｔａ
−Ｔｄとする。（ただし、Ｔｄは主局Ｍと従局Ｓの時刻
差とする。）このとき、主局Ｍの時計の時刻を、従局Ｓ
の時刻に設定する。図５において、主局Ｍが時刻Ｔａの
とき、この時刻値Ｔａを従局Ｓにデータとして送出すれ
ば、主局Ｍと従局Ｓ間を接続する通信回線には、通信遅
延△Ｔｎが存在するから、時刻Ｔａに主局Ｍを発したデ
ータは、主局Ｍの時計で時刻Ｔａ＋△Ｔｎとして従局Ｓ
ｎに到達する。このデータが到達した時刻Ｔｂは、従局
Ｓの時計では主局Ｍの時刻より△Ｔｎ後、即ち式（１）
となる。[Operation] In the present invention, the time difference between the master station and the slave station is corrected by the following method, and the time of the master station is set in the slave station. In a configuration similar to the conventional one as shown in FIG. 3, when the time of the master station M is Ta, the time Tn of the slave station S is Tn=Ta.
−Td. (However, Td is the time difference between the master station M and the slave station S.) At this time, the time on the clock of the master station M is set to the time difference between the master station M and the slave station S.
Set to the time of the day. In FIG. 5, when master station M is at time Ta, if this time value Ta is sent as data to slave station S, there will be a communication delay ΔTn in the communication line connecting master station M and slave station S. , the data issued by the master station M at time Ta is sent to the slave station S as time Ta+△Tn by the clock of the master station M.
Reach n. The time Tb when this data arrives is △Tn later than the time of the master station M in the clock of the slave station S, that is, according to equation (1)
becomes.
【０００９】
Ｔｂ＝Ｔｎ＋△Ｔｎ＝Ｔａ−Ｔｄ＋△Ｔｎ
……（１）次に、主局Ｍからデータを受信した従局
Ｓは、設定されている時刻の時計での受信時刻Ｔｂと受
信した時刻Ｔｅとを、主局Ｍへの返送データとして送信
する。このときの通信回線の遅延を同じく△Ｔｎとする
と、この返送データが主局Ｍに到達する時刻Ｔｃは、従
局Ｓでの返送までに要した時間を△Ｓｎとすると、
△Ｓｎ＝Ｔｅ−Ｔｂであり
主局Ｍの時計で式（２）となる。Tb=Tn+ΔTn=Ta−Td+ΔTn
...(1) Next, the slave station S that has received the data from the master station M transmits the reception time Tb on the set clock and the received time Te to the master station M as return data. . If the communication line delay at this time is also △Tn, the time Tc at which this returned data reaches the master station M is the time required for the return data at the slave station S to be △Sn, then △Sn=Te-Tb The clock of the main station M is expressed as equation (2).
【００１０】
Ｔｃ＝Ｔａ＋△Ｔｎ＋△Ｓｎ＋△Ｔｎ ……（２）こ
の時、計測できる時刻は、前述のように、最初、主局よ
りデータを送った時刻Ｔａ、従局にて、前記データを受
け取った時刻Ｔｂを送出したときの時刻Ｔｅと返送デー
タを主局Ｍで受信した時刻Ｔｄである。このＴａ，Ｔｂ
，Ｔｃ，Ｔｅの４つの計測値により通信遅延を取り除き
時刻差Ｔｄを求めると式（４），（５），（６）となる
。[0010] Tc=Ta+△Tn+△Sn+△Tn...(2) At this time, the measurable times are, as mentioned above, the time Ta when the data is first sent from the master station, and the time when the data is received at the slave station. These are the time Te at which time Tb was sent out, and the time Td at which the main station M received the returned data. This Ta, Tb
, Tc, and Te to remove the communication delay and calculate the time difference Td, formulas (4), (5), and (6) are obtained.
【００１１】
Ｔｃ−Ｔａ＝△Ｔｎ＋△Ｓｎ＋△Ｔｎ＝Ａ
……（４） Ｔｂ−Ｔａ＝△Ｔｎ−Ｔｄ＝Ｂ
………………（５） Ｔｅ−Ｔｂ＝
△Ｓｎ＝Ｃ ……………………（６）式
（４），（５），（６）により式（７），（８）を得る
。[0011] Tc-Ta=△Tn+△Sn+△Tn=A
...(4) Tb-Ta=△Tn-Td=B
………………(5) Te−Tb=
ΔSn=C ……………………(6) Formulas (7) and (8) are obtained from formulas (4), (5), and (6).
【００１２】
２△Ｔｎ＋Ｃ＝Ａ ………（７
）△Ｔｎ−Ｔｄ＝Ｂ ………（
８）また、式（７），（８）によりＴｄ＝△Ｔｎ−Ｂ＝
（Ａ−Ｃ）／２−Ｂ＝（Ｔａ−Ｔｂ＋Ｔｃ−Ｔｅ）／２
を得る。このＴｄを用いて従局Ｓｎの時刻のずれＴｎ＝
Ｔａ−Ｔｄの−Ｔｄを０に補正すると従局Ｓの補正され
た時刻Ｔｎは、主局Ｍの時刻Ｔａに正しく設定される。2△Tn+C=A (7
)△Tn-Td=B ………(
8) Also, according to equations (7) and (8), Td=△Tn-B=
(A-C)/2-B=(Ta-Tb+Tc-Te)/2
get. Using this Td, the time difference Tn of slave station Sn=
When -Td of Ta-Td is corrected to 0, the corrected time Tn of the slave station S is correctly set to the time Ta of the master station M.
【００１３】[0013]
【実施例】次に、本発明について図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.
【００１４】図１は本発明の一実施例のブロック図であ
り、主局１０と従局２０（１〜ｎ）が、遅延のある回線
で、それぞれ接続されている。FIG. 1 is a block diagram of an embodiment of the present invention, in which a master station 10 and slave stations 20 (1 to n) are connected to each other via a delay line.
【００１５】主局１０は、演算処理や制御を行うＣＰＵ
１１、内部にある時計１２、時刻値を記憶させるための
メモリ１３、時刻設定処理を行うプログラムの記述され
たプログラムメモリ１４及び通信インタフェース１５を
有して構成され、ＣＰＵ１１の制御により、プログラム
メモリ１４の中に記述されているプログラムによって時
刻設定処理が行われる。The main station 10 is a CPU that performs arithmetic processing and control.
11, an internal clock 12, a memory 13 for storing time values, a program memory 14 in which a program for time setting processing is written, and a communication interface 15. Under the control of the CPU 11, the program memory 14 The time setting process is performed by the program written in the .
【００１６】従局２０では、同じくＣＰＵ２１，時計２
２，メモリ２３，プログラムメモリ２４及び通信インタ
フェース２５を有して構成され、ＣＰＵ２１の制御によ
りプログラムメモリ２４の中に記述されているプログラ
ムによって時刻設定処理が行われる。[0016] Similarly, in the slave station 20, the CPU 21 and the clock 2
2, a memory 23, a program memory 24, and a communication interface 25, and time setting processing is performed by a program written in the program memory 24 under the control of the CPU 21.
【００１７】図２（ａ）は本実施例の主局での処理手順
を示すフローチャートおよび図３（ｂ）は本実施例の従
局での処理手順を示すフローチャートである。遠隔時刻
設定の処理手順を説明すると、主局１０では時計１２の
時刻がＴａのとき、時刻Ｔａのデータを従局２０に送出
する。またメモリ１３にこの時刻データＴａを記憶させ
ておく（ステップ１）。従局では、主局Ｍ１０からの時
刻Ｔａのデータを受信したら、ただちに、従局２０の時
計２２での受信時刻Ｔｂをメモリ２３に記憶させる（ス
テップ２）。プログラムメモリ２４では、メモリ２３に
記憶の時刻Ｔｂ及び自局の時刻Ｔｅを主局１０にデータ
として、返送する（ステップ３）。主局１０では、この
間、従局２０からの返送データを持ち、返送データを受
信したら（ステップ４）、その時刻値Ｔｃを時計１２で
読み、次に、Ｔｂ，Ｔｃ，Ｔｅ値を、メモリ１３に記憶
する（ステップ５）。FIG. 2(a) is a flowchart showing the processing procedure in the master station of this embodiment, and FIG. 3(b) is a flowchart showing the processing procedure in the slave station of this embodiment. To explain the processing procedure for remote time setting, when the time on the clock 12 is Ta, the master station 10 sends data at time Ta to the slave station 20. The time data Ta is also stored in the memory 13 (step 1). When the slave station receives the data at time Ta from the master station M10, it immediately stores the reception time Tb at the clock 22 of the slave station 20 in the memory 23 (step 2). The program memory 24 returns the time Tb stored in the memory 23 and the local time Te to the main station 10 as data (step 3). During this time, the master station 10 has the return data from the slave station 20, and upon receiving the return data (step 4), reads the time value Tc using the clock 12, and then stores the Tb, Tc, and Te values in the memory 13. Store (step 5).
【００１８】次に、主局１０のＣＰＵ１１の制御および
、プログラムメモリ１４の中に記述されているプログラ
ムにより、メモリ１３からデータＴａ，Ｔｂ，Ｔｃ，Ｔ
ｅを読みだし、Ｔｄ＝（Ｔａ−Ｔｂ＋Ｔｃ−Ｔｅ）／２
の演算を行い、Ｔｄを求め、これを従局２０に通信回線
を通じ、転送する（ステップ６）。受信の時刻差Ｔｄに
より、従局内のＣＰＵ２１及びプログラムメモリ２４中
のプログラムの処理によって、従局２０の時計の時刻を
Ｔｎ＝Ｔｎ＋Ｔｄとして、時刻を設定し直す（ステップ
７）。Next, under the control of the CPU 11 of the main station 10 and the program written in the program memory 14, the data Ta, Tb, Tc, T
Read out e, Td=(Ta-Tb+Tc-Te)/2
is calculated to obtain Td, which is transferred to the slave station 20 via the communication line (step 6). Based on the reception time difference Td, the time on the clock of the slave station 20 is reset to Tn=Tn+Td by the processing of the CPU 21 in the slave station and the program in the program memory 24 (step 7).
【００１９】[0019]
【発明の効果】以上説明したように本発明は、通信回線
の遅延による主局と従局間の時刻のずれを補正時間とし
て算出し、補正時間をもとに、時計の時刻を補正するこ
とにより、通信回線の遅延及びデータの変換処理時間に
影響されずに主局と従局の時計の時刻を正確に合わせる
ことができる。[Effects of the Invention] As explained above, the present invention calculates the time difference between the master station and the slave station due to communication line delay as a correction time, and corrects the clock time based on the correction time. It is possible to accurately synchronize the clocks of the master and slave stations without being affected by communication line delays and data conversion processing time.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
【図２】本実施例の主局及び従局の処理手順を示すフロ
ーチャートである。FIG. 2 is a flowchart showing a processing procedure of a master station and a slave station in this embodiment.
【図３】従来の遠隔時刻設定方式の一例を説明するため
の構成図である。FIG. 3 is a configuration diagram for explaining an example of a conventional remote time setting method.
【図４】従来例を説明するための交信シーケンス図であ
る。FIG. 4 is a communication sequence diagram for explaining a conventional example.
【図５】本実施例を説明するための交信シーケンス図で
ある。FIG. 5 is a communication sequence diagram for explaining this embodiment.
１０ 主局
１１，２１ ＣＰＵ
１２，２２ 時計
１３，２３ メモリ
１４，２４ プログラムメモリ
１５，２５ 通信インタフェース２０ 従
局10 Master station 11, 21 CPU 12, 22 Clock 13, 23 Memory 14, 24 Program memory 15, 25 Communication interface 20 Slave station
Claims (2)
で接続され前記主局の時計に従局の時計を合わせる遠隔
時刻設定方式において、前記主局から時刻Ｔａのデータ
を送出する手段と、前記従局で前記回線からのデータが
受信された時刻Ｔｂを記憶する手段と、前記従局の時刻
Ｔｅと記憶された時刻Ｔｂとのデータを前記回線で前記
主局に返送する手段と、前記主局で返送されたデータが
受信された時刻Ｔｃ及び時刻Ｔｅ，Ｔｈを記憶する手段
と、前記時刻Ｔａ，Ｔｂ，Ｔｃ及びＴｅの関係により通
信遅延を除き前記主局と従局間の時刻のずれを補正時間
Ｔｄとして算出する手段と、前記補正時間Ｔｄをもとに
前記従局の時刻を補正する手段とを有することを特徴と
する遠隔時刻設定方式。1. In a remote time setting method in which a master station and a plurality of slave stations are connected by a line with a delay and the clock of the master station is adjusted to the clock of the slave stations, means for transmitting data at time Ta from the master station. , means for storing time Tb at which the slave station receives data from the line; means for returning data of the time Te of the slave station and the stored time Tb to the master station over the line; Means for storing the time Tc and times Te and Th at which the returned data was received at the station, and the time difference between the master station and the slave station, excluding communication delays, based on the relationship between the times Ta, Tb, Tc and Te. A remote time setting method comprising: means for calculating a correction time Td; and means for correcting the time of the slave station based on the correction time Td.
ｃ−Ｔｅ）／２により算出することを特徴とする請求項
１記載の遠隔時刻設定方式。2. The correction time Td is (Ta−Tb+T
2. The remote time setting method according to claim 1, wherein the time is calculated by c-Te)/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3009490A JPH04253212A (en) | 1991-01-30 | 1991-01-30 | Remote time setting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3009490A JPH04253212A (en) | 1991-01-30 | 1991-01-30 | Remote time setting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04253212A true JPH04253212A (en) | 1992-09-09 |
Family
ID=11721679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3009490A Pending JPH04253212A (en) | 1991-01-30 | 1991-01-30 | Remote time setting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04253212A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61233822A (en) * | 1985-04-08 | 1986-10-18 | Mitsubishi Electric Corp | Time matching method of on-line connector |
| JPH0259809A (en) * | 1988-08-25 | 1990-02-28 | Toshiba Corp | Time control system for multi-computer system |
-
1991
- 1991-01-30 JP JP3009490A patent/JPH04253212A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61233822A (en) * | 1985-04-08 | 1986-10-18 | Mitsubishi Electric Corp | Time matching method of on-line connector |
| JPH0259809A (en) * | 1988-08-25 | 1990-02-28 | Toshiba Corp | Time control system for multi-computer system |
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| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19970826 |