JP2005318230A - Master slave type serial communication system - Google Patents

Master slave type serial communication system Download PDF

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JP2005318230A
JP2005318230A JP2004133125A JP2004133125A JP2005318230A JP 2005318230 A JP2005318230 A JP 2005318230A JP 2004133125 A JP2004133125 A JP 2004133125A JP 2004133125 A JP2004133125 A JP 2004133125A JP 2005318230 A JP2005318230 A JP 2005318230A
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output signal
slave
processing device
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JP4206959B2 (en
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Yoshinori Isomura
宜典 礒村
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a master-slave type serial communication system capable of initializing a slave processor through hardware. <P>SOLUTION: A serial transmitting/receiving means 3 transmits and receives serial data to/from a master processor and outputs an initialization signal to a control processor 4 when receiving serial data initializing the slave processor 2. The control processing means 4 performs output terminal control over the slave processor 2 on the basis of the signal of the serial transmitting/receiving means 3 to initialize the inside according to the input state of a reset input terminal and controls an output signal to the outside via an output signal processing means 5 on the basis of the signal of the serial transmitting/receiving means 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ＯＡ分野やＦＡ分野に搭載されるマスタ・スレーブ方式のシリアル通信システムに関する。   The present invention relates to a master / slave type serial communication system mounted in the OA field and the FA field.

ＯＡ分野やＦＡ分野に搭載されるマスタ・スレーブ方式のシリアル通信システムを図３に示す。マスタ処理装置１は、リング状ネットワークを介してスレーブ処理装置１０への指令やスレーブ処理装置１０からの応答をシリアル通信で送受信している。   FIG. 3 shows a master-slave type serial communication system installed in the OA field and the FA field. The master processing device 1 transmits and receives commands to the slave processing device 10 and responses from the slave processing device 10 via serial communication via a ring network.

図４はスレーブ処理装置１０の内部構成を示しており、１１はシリアル送受信手段で、マスタ処理装置１からのシリアルデータを送受信する。１２は制御処理手段で、シリアル送受信手段１１の信号に基づきスレーブ処理装置１０の制御をつかさどる。１３はリセット信号出力手段で、制御処理手段１２から出力される初期化信号に基づきリセット信号を出力する。   FIG. 4 shows the internal configuration of the slave processing apparatus 10, and 11 is a serial transmission / reception means for transmitting / receiving serial data from the master processing apparatus 1. A control processing unit 12 controls the slave processing apparatus 10 based on a signal from the serial transmission / reception unit 11. A reset signal output means 13 outputs a reset signal based on the initialization signal output from the control processing means 12.

従来のマスタ・スレーブ方式のシリアル通信システムは、マスタ処理装置１がスレーブ処理装置１０の初期化を行う場合、まず、マスタ処理装置１からの初期化の指令をスレーブ処理装置１０のシリアル送受信手段１１が受信しその受信データを制御処理手段１２が読みとり初期化信号を制御処理手段１２が出力する。さらに、制御処理手段１２から出力された初期化信号をリセット信号出力手段１３が入力しリセット信号をシリアル送受信手段１１と制御処理手段１２へ出力し初期化を行う（例えば、特許文献１参照）。
実開平５−８６３０号公報（第２頁、第１図） In the conventional master-slave type serial communication system, when the master processing device 1 initializes the slave processing device 10, first, an initialization command from the master processing device 1 is sent to the serial transmission / reception means 11 of the slave processing device 10. Is received by the control processing means 12 and the control processing means 12 outputs an initialization signal. Further, the initialization signal output from the control processing unit 12 is input to the reset signal output unit 13 and the reset signal is output to the serial transmission / reception unit 11 and the control processing unit 12 to perform initialization (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 5-8630 (Page 2, Fig. 1)

このように構成された従来のマスタ・スレーブ方式のシリアル通信システムには、制御処理手段が故障あるいは制御処理手段のプログラムが暴走した場合に、初期化を行うことができないという問題点があった。また、初期化が行われたとしてもスレーブが出力端子制御の構成時には、出力状態も初期化される問題点があった。これは、例えばエアーバルブなどが接続された場合に、その状態も初期化されてしまうことになり、意図しない動作を行うことが問題となる。   The conventional master-slave type serial communication system configured as described above has a problem that initialization cannot be performed when the control processing unit fails or the program of the control processing unit runs out of control. Even if the initialization is performed, the output state is also initialized when the slave is configured for output terminal control. For example, when an air valve or the like is connected, the state is also initialized, which causes a problem of performing an unintended operation.

本発明は、上記に鑑みてなされたもので、ハード的にスレーブ処理装置を初期化することができ操作性のよいマスタ・スレーブ方式のシリアル通信システムを提供することを目的とする。   The present invention has been made in view of the above, and an object of the present invention is to provide a master-slave type serial communication system that can initialize a slave processing device in hardware and has good operability.

上記の課題を解決するために本発明は、マスタ処理装置と複数のスレーブ処理装置とをシリアル通信線でリング状ネットワークにて接続しシリアルデータの送受信を行うマスタ・スレーブ方式のシリアル通信システムにおいて、出力端子制御の構成をしたスレーブ処理装置は、前記マスタ処理装置からのシリアルデータを送受信し外部への出力信号を制御し、初期化を指令するシリアルデータを受信した場合に初期化信号を出力するシリアル送受信手段と、前記シリアル送受信手段の信号に基づきスレーブ処理装置の外部への出力信号を制御し、前記初期化信号により初期化を実行する制御処理手段と、初期化を実行する直前の出力状態を保持する出力信号処理手段とを備え、前記制御処理手段は初期化を実行する際に、出力信号処理手段を介して外部への出力信号を制御するものである。   In order to solve the above problems, the present invention provides a master-slave type serial communication system in which a master processing device and a plurality of slave processing devices are connected via a serial communication line in a ring network to transmit / receive serial data. The slave processing device configured for output terminal control transmits / receives serial data from the master processing device, controls an output signal to the outside, and outputs an initialization signal when receiving serial data instructing initialization. A serial transmission / reception means; a control processing means for controlling an output signal to the outside of the slave processing device based on a signal of the serial transmission / reception means; and an initialization state according to the initialization signal; and an output state immediately before the initialization is executed. Output signal processing means for holding the output signal processing means, when the control processing means executes initialization, the output signal processing means And controls the output signal to the outside by.

シリアル送受信手段がマスタ処理装置からの初期化の指令に基づき初期化信号を出力する構成とすることで、ハード的にスレーブ処理装置を初期化でき、かつスレーブ処理装置の外部への出力信号は、初期化を行う直前の出力状態に保持できる。   By configuring the serial transmission / reception means to output an initialization signal based on an initialization command from the master processing device, the slave processing device can be initialized in hardware, and the output signal to the outside of the slave processing device is The output state immediately before initialization can be maintained.

本発明のマスタ・スレーブ方式のシリアル通信システムによれば、シリアル送受信手段がマスタ処理装置からの初期化のシリアルデータに基づき初期化信号を出力する構成とすることにより、スレーブ処理装置の初期化をハード的に行うことができる。これにより、制御処理手段が故障あるいは制御処理手段のプログラムが暴走した場合でも確実にスレーブ処理装置を初期化するシルアル通信システムを実現できる。   According to the serial communication system of the master / slave system of the present invention, the serial transmission / reception means outputs the initialization signal based on the initialization serial data from the master processing device, thereby initializing the slave processing device. Can be done hard. As a result, it is possible to realize a serial communication system that reliably initializes the slave processing device even when the control processing unit fails or the program of the control processing unit runs out of control.

また、ハード的にスレーブ処理装置を初期化できるとともに初期化を行う直前の出力状態を保持できるため、本発明のシリアル通信システムを搭載した機械は、少なくとも初期化される直前の状態にあるため暴走や誤動作など、想定外の動作の心配がなく安全なシステムを構築できる。   In addition, since the slave processing device can be initialized in hardware and the output state immediately before the initialization can be maintained, the machine equipped with the serial communication system of the present invention is at least in a state immediately before being initialized, and thus runs away. You can build a safe system without worrying about unexpected operations such as malfunctions and malfunctions.

スレーブ処理装置は、出力端子制御の構成をしたスレーブ処理装置は、マスタ処理装置からのシリアルデータを送受信し外部への出力信号を制御し、初期化を指令するシリアルデータを受信した場合に初期化信号を出力するシリアル送受信手段と、前記シリアル送受信手段の信号に基づきスレーブ処理装置の外部への出力信号を制御し、前記初期化信号により初期化を実行する制御処理手段と、初期化を実行する直前の出力状態を保持する出力信号処理手段とを備え、前記制御処理手段は初期化を実行する際に、出力信号処理手段を介して外部への出力信号を制御し、シリアル通信システムに異常があった場合に異常があった直前の出力状態を出力し、シリアル通信システムの通信が正常かつマスタからのシリアルデータが複数回の通信で連続して同値の時に、出力信号処理手段が保持した出力信号を解除する。   Slave processing device is configured when output terminal control is configured. Slave processing device transmits and receives serial data from the master processing device, controls the output signal to the outside, and initializes when receiving serial data commanding initialization. A serial transmission / reception means for outputting a signal, a control processing means for controlling an output signal to the outside of the slave processing device based on the signal of the serial transmission / reception means, and executing initialization by the initialization signal; Output signal processing means for holding the immediately preceding output state, and the control processing means controls the output signal to the outside via the output signal processing means when executing initialization, and the serial communication system has an abnormality. If there is an error, the output status immediately before the error is output, the communication of the serial communication system is normal, and the serial data from the master is connected multiple times. When equivalence and to release the output signal the output signal processing unit has retained.

以下、本発明の実施例１について、図面を参照して説明する。   Embodiment 1 of the present invention will be described below with reference to the drawings.

図２は、本発明のマスタ・スレーブ方式のシリアル通信システム構成図で、マスタ処理装置１は、リング状ネットワークを介してスレーブ処理装置２への指令やスレーブ処理装置２からの応答をシリアル通信で送受信している。   FIG. 2 is a configuration diagram of a master / slave type serial communication system according to the present invention. The master processing device 1 transmits commands to the slave processing device 2 and responses from the slave processing device 2 via serial communication via a ring network. Sending and receiving.

図１は、スレーブ処理装置２の内部構成を示したもので、シリアル送受信手段３は、マスタ処理装置１からのシリアルデータを送受信し、かつマスタ処理装置１からスレーブ処理装置２を初期化するシリアルデータを受信した場合に制御処理装置４に初期化信号を出力する。   FIG. 1 shows the internal configuration of the slave processing device 2. The serial transmission / reception means 3 transmits / receives serial data from the master processing device 1 and initializes the slave processing device 2 from the master processing device 1. When data is received, an initialization signal is output to the control processing device 4.

制御処理手段４は、シリアル送受信手段３の信号に基づきスレーブ処理装置２の出力端子制御をつかさどり、リセット入力端子の入力状態により内部を初期化し、シリアル送受信手段３の信号に基づき出力信号処理手段５を介して外部への出力信号を制御する。   The control processing means 4 controls the output terminal of the slave processing device 2 based on the signal of the serial transmission / reception means 3, initializes the inside according to the input state of the reset input terminal, and outputs the signal processing means 5 based on the signal of the serial transmission / reception means 3. The output signal to the outside is controlled via

出力信号処理手段５は、シリアル送受信手段３の信号がスレーブ処理装置２に正常に入力されるたびに制御処理手段４からの外部への出力信号をラッチし、電源入力時のみラッチ出力を初期化し、かつエラー時もしくは初期化時にラッチした直前の出力信号を保持する。また、スレーブ処理装置２に正常に入力される信号が複数回の通信で連続してシリアル送受信手段３に入力されたときに、出力信号処理手段５の出力信号の保持を解除するように制御する。   The output signal processing means 5 latches the output signal from the control processing means 4 to the outside every time the signal of the serial transmission / reception means 3 is normally input to the slave processing device 2, and initializes the latch output only when the power is input. And the output signal immediately before latching at the time of error or initialization is held. Further, when a signal normally input to the slave processing device 2 is continuously input to the serial transmission / reception unit 3 by a plurality of communications, control is performed so as to release the holding of the output signal of the output signal processing unit 5. .

次に、マスタ処理装置１からｎ番目のスレーブ処理装置２を初期化する指令が通信された場合について説明する。まず、マスタ処理装置１からｎ番目のスレーブ処理装置２を初期化するシリアルデータが、リング状ネットワークを介しｎ番目のスレーブ処理装置２へ出力される。ｎ番目のスレーブ処理装置２では、初期化のシリアルデータをシリアル送受信手段３が受信し、ハード的に初期化信号を出力する。シリアル送受信手段３から出力された初期化信号は制御処理手段４のリセット入力端子に入力され制御処理手段４を初期化する。   Next, a case where a command for initializing the nth slave processing device 2 is communicated from the master processing device 1 will be described. First, serial data for initializing the nth slave processing device 2 is output from the master processing device 1 to the nth slave processing device 2 via the ring network. In the n-th slave processing device 2, the serial transmission / reception means 3 receives the serial data for initialization, and outputs an initialization signal in hardware. The initialization signal output from the serial transmission / reception unit 3 is input to the reset input terminal of the control processing unit 4 to initialize the control processing unit 4.

このように、マスタ処理装置１からｎ番目のスレーブ処理装置２を初期化するシリアルデータを送信すると、ｎ番目のスレーブ処理装置２の初期化をハード的に行うことができ、初期化のシリアルデータをシリアル送受信手段３が受信する直前の出力信号を出力することにより、制御処理手段４が故障あるいは制御処理手段４のプログラムが暴走した場合でも確実で安全にスレーブ処理装置２の初期化ができる。   As described above, when the serial data for initializing the nth slave processing device 2 is transmitted from the master processing device 1, the nth slave processing device 2 can be initialized by hardware, and the serial data for initialization can be obtained. By outputting the output signal immediately before the serial transmission / reception means 3 receives the signal, the slave processing device 2 can be initialized reliably and safely even when the control processing means 4 fails or the program of the control processing means 4 runs out of control.

また、エラー発生時においても、シリアル送受信手段３の信号がスレーブ処理装置２に正常に入力されたときのみラッチし、エラー発生時にはエラー発生直前の出力状態を保持する。   Even when an error occurs, it is latched only when the signal of the serial transmission / reception means 3 is normally input to the slave processing device 2, and when an error occurs, the output state immediately before the error occurs is held.

このようにエラー発生時においても通信でおかしなデータが入力されエラーを認識すると出力信号処理手段５はエラー直前の出力状態を保持できるため、エラー発生時に間違った出力状態を出力することはない。   As described above, even when an error occurs, if strange data is input through communication and an error is recognized, the output signal processing means 5 can hold the output state immediately before the error, so that an incorrect output state is not output when the error occurs.

また、出力状態が保持されている状態を解除するには、シリアル送受信手段３の信号がスレーブ処理装置２に正常に入力される出力信号が複数回の通信で連続して入力されたときに制御処理手段４が出力信号処理手段５に出力状態を更新できるように保持状態を解除する。   Further, in order to cancel the state in which the output state is held, control is performed when an output signal in which the signal of the serial transmission / reception means 3 is normally input to the slave processing device 2 is continuously input by a plurality of communications. The holding state is released so that the processing means 4 can update the output state to the output signal processing means 5.

なお、出力信号処理手段５はラッチ等のデジタル回路で簡単に構成でき、ラッチを実行するか否かは初期化とエラーの有無をシリアル送受信手段３および制御処理手段４にて判断する構成で可能である。   The output signal processing means 5 can be easily configured by a digital circuit such as a latch, and whether or not to execute the latch can be determined by initialization and the presence / absence of an error determined by the serial transmission / reception means 3 and the control processing means 4. It is.

また、保持状態の解除を判断するにはシリアル送受信手段３においてシリアルデータをメモリに格納し、その格納したデータを複数回一致か否かにより簡単に判断できる。   In order to determine the release of the hold state, the serial transmission / reception means 3 can store the serial data in the memory, and can easily determine whether the stored data matches a plurality of times.

本発明の構成により、スレーブ処理装置２で機器の制御を行っている場合には、少なくとも初期化直前の状態に保持できるため不安全動作を防止できる。また、出力信号の保持状態も出力信号が複数回の通信で連続して入力されたときに解除されるため電源の再投入の必要がなく、操作性に優れている。また、シリアル送受信手段３がマスタ処理装置１からの初期化のシリアルデータに基づき初期化信号を出力する構成とすることにより、スレーブ処理装置２の初期化をハード的に行うことができる。これにより、制御処理手段４が故障あるいは制御処理手段４のプログラムが暴走した場合でも確実にスレーブ処理装置を初期化できる。   With the configuration of the present invention, when the device is controlled by the slave processing device 2, at least the state immediately before the initialization can be maintained, so that unsafe operation can be prevented. Further, since the output signal holding state is released when the output signal is continuously input by a plurality of communications, it is not necessary to turn on the power again, and the operability is excellent. In addition, since the serial transmission / reception unit 3 outputs an initialization signal based on the initialization serial data from the master processing device 1, the slave processing device 2 can be initialized in hardware. Thereby, even if the control processing unit 4 is out of order or the program of the control processing unit 4 runs out of control, the slave processing device can be surely initialized.

本発明に係るマスタ・スレーブ方式のシリアル通信システムは、ハード的にスレーブ処理装置を初期化でき、かつ初期化を行う直前の出力状態を保持できるため、暴走や誤動作等の想定外の動作を行うことがなく、ＦＡ分野に限らず他の用途にも有用である。   The master-slave type serial communication system according to the present invention is capable of initializing the slave processing device in hardware and maintaining the output state immediately before the initialization, and thus performs an unexpected operation such as a runaway or malfunction. It is useful not only for the FA field but also for other applications.

本発明の実施例１におけるスレーブの構成図Configuration diagram of slave in embodiment 1 of the present invention 本発明の実施例１におけるシリアル通信システム構成図1 is a configuration diagram of a serial communication system according to a first embodiment of the present invention. 従来のシリアル通信システム構成図Configuration diagram of a conventional serial communication system 従来のスレーブの構成図Configuration diagram of a conventional slave

符号の説明Explanation of symbols

１ マスタ処理装置
２ スレーブ処理装置
３ シリアル送受信手段
４ 制御処理手段
５ 出力信号処理手段 DESCRIPTION OF SYMBOLS 1 Master processing apparatus 2 Slave processing apparatus 3 Serial transmission / reception means 4 Control processing means 5 Output signal processing means

Claims (3)

マスタ処理装置と複数のスレーブ処理装置とをシリアル通信線でリング状ネットワークにて接続しシリアルデータの送受信を行うマスタ・スレーブ方式のシリアル通信システムにおいて、出力端子制御の構成をしたスレーブ処理装置は、前記マスタ処理装置からのシリアルデータを送受信し外部への出力信号を制御し、初期化を指令するシリアルデータを受信した場合に初期化信号を出力するシリアル送受信手段と、前記シリアル送受信手段の信号に基づきスレーブ処理装置の外部への出力信号を制御し、前記初期化信号により初期化を実行する制御処理手段と、初期化を実行する直前の出力状態を保持する出力信号処理手段とを備え、前記制御処理手段は初期化を実行する際に、出力信号処理手段を介して外部への出力信号を制御することを特徴としたマスタ・シリアル方式のシリアル通信システム。 In a master-slave type serial communication system in which a master processing device and a plurality of slave processing devices are connected via a serial communication line in a ring network to transmit / receive serial data, the slave processing device configured for output terminal control is: Serial transmission / reception means for transmitting / receiving serial data from the master processing device and controlling an output signal to the outside, and receiving serial data instructing initialization, and a serial transmission / reception means for outputting signals to the serial transmission / reception means A control processing means for controlling an output signal to the outside of the slave processing device based on the initialization signal, and an output signal processing means for holding an output state immediately before the initialization is performed, The control processing means controls the output signal to the outside through the output signal processing means when performing initialization. Serial communication system of the master serial scheme characterized. 制御処理手段は、シリアル通信システムに異常があった場合に出力信号処理手段を介して異常があった直前の出力状態を保持する請求項１に記載のマスタ・シリアル方式のシリアル通信システム。 2. The master-serial serial communication system according to claim 1, wherein the control processing means holds the output state immediately before the abnormality has occurred via the output signal processing means when there is an abnormality in the serial communication system. 制御処理手段は、シリアル通信システムの通信が正常かつマスタからのシリアルデータが複数回の通信で連続して同値の時、出力信号処理手段が保持した出力信号を解除する請求項１または請求項２に記載のマスタ・シリアル方式のシリアル通信システム。 3. The control processing means cancels the output signal held by the output signal processing means when the communication of the serial communication system is normal and the serial data from the master has the same value continuously in a plurality of times of communication. The serial communication system of the master serial system described in 1.
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