WO2013046296A1 - 伝送ライン断線検出方式およびその方式に使用する子局ターミナル - Google Patents
伝送ライン断線検出方式およびその方式に使用する子局ターミナル Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
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- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- the present invention reduces the number of signal lines between a master station connected to a single control unit and a plurality of slave stations corresponding to a plurality of controlled devices, and connects them with a common data signal line.
- a control system having a single control unit and a plurality of controlled devices (consisting of a controlled unit that operates in response to an instruction from the control unit and a sensor unit that transmits information to the control unit), the number of wires Thus, so-called wiring-saving is widely implemented.
- a parent device instead of a parallel connection that directly connects each of the signal lines extending from a plurality of controlled devices to the control unit, a parent device having a conversion function of a parallel signal and a serial signal is provided.
- a system is widely used in which a station and a plurality of slave stations are connected to a control unit and a plurality of controlled devices, respectively, and data is exchanged between the master station and the plurality of slave stations by serial signals.
- a method for confirming disconnection on the slave station side on the control unit side has been proposed.
- a plurality of terminal units each having an address set are connected to one master unit via a common signal line, and designated addresses are sequentially transmitted from the master unit.
- a disconnection detection method for a time division multiplex transmission system in which a transmission signal is sent while being changed to a click and a reply signal is sent from an addressed terminal unit is disclosed.
- the master unit detects that a state in which a reply signal from the terminal unit cannot be received has continuously occurred for a predetermined number of transmission cycles, and it is determined that a disconnection has occurred in the signal line.
- this disconnection detection method as a method for exchanging data between a plurality of devices, a command method for designating data (address data) for identifying the other party (slave station) to which data is exchanged Is adopted.
- This command method can also be adopted in a method in which data transmission / reception is performed using a serial signal when wiring is reduced.
- the command method has a problem that the transmission efficiency decreases when the command data (address data) increases with respect to the data amount to be transmitted. Therefore, in order to increase the transmission efficiency by the serial signal, there is a case where a transmission synchronization method in which data is exchanged by a monitoring signal and a control signal sequentially transmitted in a pulse cycle not including address data may be preferable. In this way, the command method and the transmission synchronization method are properly used in the wiring-saving technology, but a method for confirming the disconnection on the slave station side on the control side is also proposed for the system adopting the transmission synchronization method. Has been.
- Japanese Patent Laid-Open No. 7-99503 discloses a data transmission apparatus that can easily identify an abnormality occurrence location in a transmission line.
- a confirmation signal is output to the final region for one round of the pulse signal transmitted to the signal line on the condition that the count value in the round counter of the local station becomes a predetermined value assigned to itself. Answering means is provided in each terminal unit.
- the abnormality detection means connected to the signal line determines the presence or absence of a confirmation signal from the answer means of the terminal unit corresponding to the count value of its own lap counter, and if there is a confirmation signal, It is determined that there is no connection abnormality of the corresponding terminal unit, and a check signal is output to the final region for one round of the pulse signal transmitted to the signal line. Further, when there is no confirmation signal, it is determined that there is a connection abnormality of the terminal unit corresponding to the count value, and the check signal is not output, so that the master unit can detect disconnection.
- Japanese Laid-Open Patent Publication No. 9-84155 is composed of one master station and one or more slave stations connected to the master station.
- the control signal transmitted from the master station is transmitted to the slave station to control the slave station.
- a control / monitoring system that transmits monitoring signals including the status of the main station to the main station, the location where the error occurred can be detected at the central main station, and the disconnection is detected even if the transmission cable is branched.
- a technique for identifying the state of a device such as a sensor unit at the center is disclosed.
- a frame transmitted from the master station is composed of a start signal, a data signal, a slave station identification code (ID code) signal, and an end signal that have a long power supply voltage level period.
- ID code slave station identification code
- each slave station an ID code assigned to the own station and a count value indicating a data transmission / reception address are set.
- an end response is generated at the timing of the end signal.
- the master station stores the end response from the corresponding slave station and records the configuration of the slave station.
- the present invention provides a transmission in which a master station connected to a single control unit and a plurality of slave stations corresponding to a plurality of controlled devices are synchronized with a transmission clock to transmit data via a common data signal line.
- An object of the present invention is to provide a transmission line disconnection detection method capable of accurately detecting a disconnection of a transmission line in a control / monitoring signal transmission system employing a synchronous method, and a slave station terminal used for the method.
- a single master station and a plurality of slave stations are connected by a common data signal line.
- the master station Under the control of the transmission clock generated by the timing generation means of the master station, the master station outputs a series of pulse signals as the control data signal according to the value of the control data delivered from the control unit.
- the data value of the monitoring data signal superimposed on every one cycle of the clock from each of the plurality of slave stations to the series of pulse signals is extracted and delivered to the control unit.
- Each of the plurality of slave stations starting from a start signal indicating the start of the series of pulse-like signals, counts the pulses of the series of pulse-like signals, and when the value of the count coincides with its own address,
- the control data corresponding to the local station is extracted from the series of pulse-like signals, and the monitoring data signal is converted to the series of pulse-like signals in the same pulse period as the clock from which the control data corresponding to the local station is extracted.
- the series of pulse-like signals includes a plurality of pulses different from a control / monitor data area configured by data of the control data signal and data of the monitor data signal.
- the individual specific data may be an address given to the slave station, and the comparison data may be the management control data. Further, the individual specific data may be a predetermined multi-bit value, and the comparison data may be the multi-bit value.
- a slave station terminal is connected to a common data signal line to which a master station is connected, and includes address extraction means, monitoring data transmission means, management control data extraction means, management monitoring data transmission means, and individual identification Data output means is provided.
- the address extracting means counts the pulses of the series of pulse signals starting from a start signal indicating the start of the series of pulse signals transmitted through the common data signal line, and the count value is automatically determined.
- a control data signal having a timing that matches the station address is obtained.
- the monitoring data transmission means is a monitoring data signal as information from the own station at a timing when the control data signal is delivered from the address extraction means to a series of pulse signals transmitted via the common data signal line. Is superimposed.
- the management control data extraction unit is configured to transmit the management data from the master station to a management data area composed of a plurality of pulse-shaped signals different from an area for superimposing the monitoring data signal in the series of pulse-shaped signals. Management control data superimposed on the data area is extracted.
- the management monitoring data transmitting means superimposes the management monitoring data signal as information from the own station in the input data period of the same period corresponding to the output data period in which the signal constituting the management control data is superimposed.
- the individual specific data output means obtains the address data from the management control data extraction means, and delivers the individual specific data of the own station to the management monitoring data transmission means when the address data matches the own station address.
- the transmission line disconnection detection method in a series of pulse signals in which one cycle of the transmission clock is divided into an input data period and an output data period, the data of the control data signal and the data of the monitoring data signal are A management data area composed of a plurality of pulse-like signals is provided, which is different from the control / monitoring data area.
- the signal which comprises the individual specific data of an own station is superimposed on this management data area as a response from a slave station, it becomes clear that it is a response from the slave station which is a detection target.
- Each slave station counts the pulses of a series of pulse signals starting from a start signal indicating the start of a series of pulse signals, and then transmits to each of the plurality of pulses constituting the control / monitor data area.
- the control data signal is extracted from the corresponding pulse and the monitoring data signal is superimposed, but the multiple pulses that make up the management data area do not correspond to any of the slave stations, and control / monitoring is performed. It does not change the data capacity of the data area.
- the signal constituting the individual specific data from the slave station is superimposed on the input data period of the same period corresponding to the output data period on which the signal constituting the management control data identifying one of the slave stations is superimposed. .
- the transmission line disconnection detection method according to the present invention is different from the control / monitoring data area composed of a plurality of pulses corresponding to each of the slave stations, and the management data area not corresponding to any slave station, It is used for both data output from the master station and data input from the slave station. Therefore, in the transmission synchronization method, a series of management data (management control data and management monitoring data) from both the master station and the slave station is started from the start signal without affecting the existing control / monitor data area. As a data group (one frame transmission cycle), control data and monitoring data can be transmitted simultaneously. In addition, the influence on the transmission rate can be reduced compared to the case where the output area from the master station and the input area from the slave station are provided separately.
- the individual specific data of a slave station is different for each of a plurality of slave stations, for example, address data required for transmission synchronization, the distinction in the case of erroneous transmission from another slave station is possible. This is preferable because it is possible.
- the slave station terminal has a management monitoring data signal as information from the own station in an input data period of the same period corresponding to an output data period in which a signal constituting management control data is superimposed in the management data area.
- FIG. 1 is a system configuration diagram showing a schematic configuration of a control / monitor signal transmission system. It is a system configuration
- control / monitor signal transmission system is connected to the control unit 1 and a single master station 2 connected to the common data signal lines DP and DN, and the common data signal lines DP and DN.
- each slave station is shown one by one, but there is no limitation on the type and number of slave stations connected to the common data signal lines DP and DN.
- the input / output slave station 5, the output slave station 6, and the input slave station 7 include an input unit 9 that takes in signal output processing for the controlled unit 8 that operates according to an output instruction from the control unit 1 and input information to the control unit 1.
- the controlled portion 8 is, for example, an actuator, a (stepping) motor, a solenoid, a solenoid valve, a relay, a thyristor, or a lamp.
- the input portion 9 is, for example, a reed switch, a micro switch, a push button switch, a photoelectric switch, or the like. Such as a switch.
- the input / output slave station 5 is connected to both the controlled unit 8 and the input unit 9, the output slave station 6 is connected only to the controlled unit 8, and the input slave station 7 is connected only to the input unit 9.
- the output slave station 6 may include the controlled unit 8, and the input slave station 7 may include the input unit 9.
- the control unit 1 is, for example, a programmable controller, a computer, and the like, and includes an output unit 11 that sends out control data 13 and management control data 14, sensor data (monitoring data signal data) 16 and disconnection from the controlled device 4 side. It has an input unit 12 that receives the detection data 15. These output unit 11 and input unit 12 are connected to the master station 2. In addition, management judging means 17 for calculating data sent from the output unit 11 based on the data received from the input unit 12 is provided.
- the master station 2 includes an output data unit 21, a management data unit 22, a timing generation unit 23, a master station output unit 24, a master station input unit 25, an input data unit 26, and a comparison determination unit 27. .
- the control data signal (hereinafter referred to as a transmission clock signal) connected to the common data signal lines DP and DN is sent to the common data signal lines DP and DN, and is connected to the input / output elements.
- Comparison data based on the monitoring data signal and the management monitoring data signal sent from the station 5, the output slave station 6, or the input slave station 7 (hereinafter referred to as "slave stations 5, 6, 7" when referring to all of them) Are sent to the input unit 12 of the control unit 1 as monitoring data 16 and disconnection detection data 15.
- the output data unit 21 delivers the parallel data received as the control data 13 from the output unit 11 of the control unit 1 to the master station output unit 24 as serial data.
- the management data unit 22 includes an IDX address table storage unit 29 that collects information on each of the slave stations 5, 6, and 7.
- the IDX address table is data for specifying any one of the slave stations 5, 6, and 7 that are subject to disconnection confirmation, and the head addresses of the slave stations 5, 6, and 7 are used. It is done. It is generated in response to a data table creation instruction from the control unit 1, and the generation procedure will be described later.
- the timing generation unit 23 includes an oscillation circuit (OSC) 31 and timing generation unit 32. Based on the OSC 31, the timing generation unit 32 generates a timing clock of this system and delivers it to the master station output unit 24.
- OSC oscillation circuit
- the master station output unit 24 includes control data generation means 33 and a line driver 34. Based on the data received from the output data unit 21 and the management data unit 22 and the timing clock received from the timing generating unit 23, the control data generating unit 33 applies a series of data to the common data signal lines DP and DN via the line driver 24. A transmission clock signal is transmitted as a pulse signal.
- the transmission clock signal has a control / monitoring data area following the start signal ST and a management data area following this.
- the control / management data area includes control data signal data OUTn (n is an integer) sent from the master station 2 and monitoring data signal data INn (n is an integer) sent from the slave stations 5, 6, and 7.
- the transmission clock signal is a pulse in which the second half of one cycle is at a high potential level (+24 V in this embodiment) and the first half is at a low potential level (+12 V in this embodiment).
- the pulse width interval in the first half becomes the output data period, and the first half of the pulse having the same low potential level also becomes the input data period.
- the pulse width interval of the low potential level represents the data OUTn of the control data signal, and the presence or absence of the current superimposed on the low potential level represents the data INn of the monitoring data signal.
- the pulse width interval width of the low potential level is expanded from (1/4) t0 to (3/4) t0.
- the width is not limited and may be determined appropriately.
- the input data period and the output data period can be appropriately determined. For example, the input data period is set to the first half of the pulse (low potential level) as in this embodiment, and the pulse width interval of the second half of the pulse (high potential level) is set.
- the output data period may be the first half of the pulse (low potential level) and the second half of the pulse (high potential level) may be the input data period as in this embodiment. Further, the latter half of the pulse (high potential level) may serve as both the output data period and the input data period. The same applies to the case where the second half of one cycle of the transmission clock signal is at a low potential level.
- the upper row shows the output data period
- the lower row shows the input data period.
- the management data area of the transmission clock signal includes a management control data area in which data IDXo (hereinafter referred to as management control data IDXo) of the management control data signal transmitted from the master station 2 is superimposed, and slave stations 5, 6, 7. Is composed of a management monitoring data area on which data IDXi (hereinafter referred to as management monitoring data IDXi) transmitted from the server is superimposed.
- the management control data IDXo is expressed as a pulse width interval width of a low potential level, like the data OUTn of the control data signal.
- the management monitoring data IDXi is expressed as the presence / absence of a current superimposed on the low potential level, similarly to the monitoring data signal data INn.
- the start signal ST is a signal having the same potential level as the high potential level of the transmission clock signal and longer than one cycle of the transmission clock signal.
- the master station input unit 25 includes a monitoring signal detection unit 35 and a monitoring data extraction unit 36, and sends serial input data 37 to the input data unit 26, and sends extracted IDXi data 38 to the comparison judgment unit 27. .
- the monitoring signal detection means 35 detects the monitoring data signal and the management monitoring data signal transmitted from the slave stations 5, 6, and 7 via the common data signal lines DP and DN. As described above, the data values of the monitoring data signal and the management monitoring data signal are represented by the presence or absence of a current superimposed on the low potential level.
- the input / output slave station 5 or the input slave station 7 sequentially receives a monitoring data signal, and subsequently receives a management monitoring data signal from any one of the slave stations 5, 6, 7.
- the data of the monitoring data signal and the management monitoring data signal are extracted by the monitoring data extraction unit 36 in synchronization with the signal of the timing generation unit 33. Then, the data of the monitoring data signal is sent to the input data unit 26 as serial input data 37. Further, serial IDXi data 38 which is a management monitoring data signal is sent to the comparison determination means 27.
- the comparison judgment unit 27 collates and compares the IDXi data 38 and the address data 39 (the same value as the management control data IDXo) delivered from the management data unit 22 and sends the matching result to the input data unit 26 and the management data unit 22. To do.
- the input data unit 26 converts the serial input data 37 received from the master station input unit 25 into parallel data, and sends the parallel data to the input unit 12 of the control unit 1. Further, the data received from the comparison judgment means 27 is sent to the input unit 12 of the control unit 1 as the disconnection detection data 15.
- the input / output slave station 5 includes a transmission receiving means 41, management control data extracting means 42, address extracting means 43, address setting means 44, control data extracting means 45, management monitoring data sending means 46, monitoring.
- a slave station input / output unit 40 having data sending means 47, output means 48, input means 49, and ID address response means 50 is provided.
- the input / output slave station 5 of this embodiment includes an MCU which is a microcomputer control unit as an internal circuit, and this MCU functions as the slave station input / output unit 40. Calculations and storages required for the processing are executed using the CPU, RAM and ROM provided in this MCU (hereinafter referred to as MCU 40). The relationship between the CPU, RAM, and ROM in the processing is not shown for convenience of explanation.
- the transmission reception means 41 receives the transmission clock signal transmitted to the common data signal lines DP and DN, and delivers it to the management control data extraction means 42, the address extraction means 43, and the management monitoring data transmission means 46.
- the management control data extraction means 42 extracts the data of the management control data signal from the management data area of the transmission clock signal and delivers these to the ID address response means 50.
- the address extraction means 43 counts pulses starting from the start signal ST indicating the start of the transmission clock signal, and at the timing when the count value coincides with its own address data set by the address setting means 44.
- the control data signal is delivered to the extraction unit 45 and the monitoring data transmission unit 47.
- the control data extraction means 45 extracts a data value from the control data signal delivered from the address extraction means 43 and delivers it to the output means 48 as serial data.
- the output unit 48 converts the serial data delivered from the control data extraction unit 45 into parallel data, outputs the parallel data to the controlled unit 8, and causes the controlled unit 8 to perform a predetermined operation.
- the monitoring data transmitting unit 47 sets the base current of the transistor TR to “on” or “off” based on the serial data delivered from the input unit 49 at the timing when the control data signal is delivered from the address extracting unit 43.
- the base current is “on”
- the transistor TR is turned “on”, and a current signal that is a monitoring data signal is output to the data signal lines DP and DN.
- a current for example, 30 mA
- the data delivered from the input unit 49 to the monitoring data transmission unit 47 is based on the input from the input unit 9. For example, when an on / off switch is connected as the input unit 9, the switch “on” is used. Alternatively, it is based on a current signal or a voltage signal indicating “off”.
- the management monitoring data transmission means 46 counts pulses starting from the start signal ST of the transmission clock signal, and obtains the timing of the management data area. Based on the data delivered from the ID address response means 50, the base current of the transistor TR is output, and a current signal which is a management monitoring data signal is output to the data signal lines DP and DN.
- the ID address response means 50 corresponds to the individual specific data output means of the present invention, and when the data IDXo of the management control data signal delivered from the management control data extraction means 42 matches the data value of the own station address.
- the local station address (corresponding to the individual specific data of the present invention) is output. However, the timing at which the local station address is output is one frame transmission cycle delayed from the frame in which the data IDXo of the management control data signal matches the data value of the local station address.
- the slave station output unit 60 of the output slave station 6 has the same configuration as the slave station input / output unit 40 except that the input unit 49 is not provided, the description thereof is omitted. Further, since the slave station input unit 70 of the input slave station 7 has the same configuration as the slave station input / output unit 40 except that the output unit 48 is not provided, the description thereof is omitted.
- an IDX address table is created.
- an instruction to create an IDX address table is sent from the control unit 1 to the master station 2.
- the master station 2 sequentially transmits all of the slave stations 5, 6, and 7 in accordance with the management control data IDXo for each transmission cycle composed of the start signal ST, the control / monitor data area, and the management data area.
- the address assigned to is specified.
- Each of the slave stations 5, 6, and 7 returns the own station address as the management monitoring data IDXi when the management control data IDXo is the own station address.
- the master station 2 extracts the management monitoring data IDXi, compares it with the management control data IDXo, and if it matches, stores it as data constituting the IDX address table.
- IDX address table only the top address is stored as data in the IDX address table.
- a station to which an address of # ad0 is assigned has a data value of the monitoring data signal of 1 bit, and the data in the IDX address table is a value in which # ad0 and # ad1 are continuous.
- the data value of the monitoring data signal is 2 bits for the station to which the address of # ad1 is assigned, the pulse of # ad2 is also assigned to the same station as # ad1. Therefore, in the data of the IDX address table, # ad3 is stored as the next value of # ad1. In this embodiment, even if the data value of the monitoring data signal is 1 bit, that is, # ad0 is set to the head address as in # ad1.
- the control unit 1 that has recognized the end of IDX address table creation outputs control management data 14 for instructing disconnection confirmation. Receiving this, the master station 2 outputs management control data IDXo that designates one of the data groups stored in the IDX address table.
- Each of the slave stations 5, 6, and 7 returns the own station address as the management monitoring data IDXi when the management control data IDXo matches the own station address.
- the master station 2 extracts the management monitoring data IDXi, compares it with the management control data IDXo, and delivers the comparison comparison result to the control unit 1 as the disconnection detection data 15.
- the control unit 1 determines that the transmission line is not broken if the result of the comparison between the extracted management monitoring data IDXi and the management control data IDXo indicates a match. If they do not match, it is determined that a disconnection has occurred in the transmission lines of the slave stations 5, 6, and 7.
- the designation of data in the IDX address table by the management control data IDXo is in accordance with the table number. That is, first, the index address data (# ad0) of table number 1 is selected and output as management control data IDXo. Then, each transmission cycle is sequentially changed to head address data corresponding to each table number.
- the order in which the IDX address table data is designated by the management control data IDXo is not limited. For example, the order of priority according to the function may be used.
- the individual specific data may be data of a plurality of bits that can be clearly distinguished from noise that the response is from the slave stations 5, 6, and 7.
- An embodiment in which a predetermined plurality of bit values are employed as the individual specific data will be described with reference to FIG. In FIG. 7, parts that are substantially the same as those of the embodiment shown in FIGS. 1 to 6 are given the same reference numerals, and descriptions thereof are omitted.
- the ID address response means 50 of the slave stations 5, 6, and 7 in this embodiment stores a predetermined plurality of bit values (such as “1010”) as individual specific data, and is delivered from the management control data extraction means 42.
- the master station 2 is provided with data storage means 28 for storing a predetermined plurality of bit values as individual specific data as comparison data, and the comparison determination means 27 is delivered from the data storage means 28.
- the comparison data and the IDXi data 38 are collated and compared, and the matching result is sent to the input data unit 26 and the management data unit 22.
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Abstract
Description
図2に示すように、この制御・監視信号伝送システムは、制御部1および共通データ信号線DP、DNに接続された単一の親局2と、前記共通データ信号線DP、DNに接続された入出力子局5、出力子局6および入力子局7の複数で構成される。なお、図2においては、図示の便宜上、各々の子局が一つずつ示されているが、共通データ信号線DP、DNに接続される子局の種類や数に制限は無い。
この制御・監視信号伝送システムでは、まず、IDXアドレステーブルが作成される。IDXアドレステーブルの作成においては、制御部1から親局2に対し、IDXアドレステーブル作成の指示が送出される。これを受けた親局2は、スタート信号STとこれに続く制御・監視データ領域と管理データ領域で構成される伝送サイクル毎に、管理制御データIDXoによって、順次子局5、6、7の全てに対し割り付けられたアドレスを指定していく。
2 親局
5 入出力子局
6 出力子局
7 入力子局
8 被制御部
9 入力部
11 出力ユニット
12 入力ユニット
13 制御データ
14 管理制御データ
15 断線検出データ
16 監視データ
17 管理判断手段
21 出力データ部
22 管理データ部
23 タイミング発生部
24 親局出力部
25 親局入力部
26 入力データ部
27 比較判断手段
28 データ記憶手段
29 記憶手段
31 OSC(発振器)
32 タイミング発生手段
33 制御データ発生手段
34 ラインドライバ
35 監視信号検出手段
36 監視データ抽出手段
37 入力データ
38 IDXiデータ
39 アドレスデータ
40 子局入出力部
41 伝送受信手段
42 管理制御データ抽出手段
43 アドレス抽出手段
44 アドレス設定手段
45 制御データ抽出手段
46 監視データ送信手段
47 管理監視データ送信手段
48 出力手段
49 入力手段
50 IDアドレス応答手段
60 子局出力部
70 子局入力部
TR トランジスタ
Claims (4)
- 単一の親局と複数の子局を共通データ信号線で接続し、
前記親局が有するタイミング発生手段で生成される伝送クロックの制御下で、
前記親局は、制御部から引き渡された制御データの値に応じた制御データ信号として一連のパルス状信号を前記共通データ信号線に出力すると共に、前記一連のパルス状信号に前記複数の子局の各々から前記クロックの1周期毎に重畳された監視データ信号のデータ値を抽出し、これを前記制御部に引き渡し、
前記複数の子局の各々は、前記一連のパルス状信号の始まりを示すスタート信号を起点として、前記一連のパルス状信号のパルスをカウントし、前記カウントの値が自局アドレスと一致したとき、前記一連のパルス状信号から自局に対応する前記制御データを抽出するとともに、前記自局に対応する前記制御データを抽出したクロックと同じパルス周期に、前記監視データ信号を前記一連のパルス状信号に重畳する制御・監視信号伝送システムにおいて、
前記一連のパルス状信号に、前記制御データ信号のデータと前記監視データ信号のデータとで構成される制御・監視データ領域と異なる、複数のパルス状信号で構成される管理データ領域を設け、
前記管理データ領域において、前記子局の一つを特定する管理制御データを構成する信号が重畳される出力データ期間とそれに対応する同一周期の入力データ期間に、前記子局からの個別特定データを構成する信号が重畳され、
前記個別特定データと比較用データの比較照合結果に基づいて断線の有無が判断されることを特徴とする伝送ライン断線検出方式。 - 前記個別特定データが、前記子局に付与されたアドレスであり、前記比較用データが前記管理制御データである請求項1に記載の伝送ライン断線検出方式。
- 前記個別特定データが、予め決められた複数ビット値であり、前記比較用データが前記複数ビット値である請求項1に記載の伝送ライン断線検出方式。
- 親局が接続された共通データ信号線に接続され、
前記共通データ信号線を介して伝送される一連のパルス状信号の始まりを示すスタート信号を起点として、前記一連のパルス状信号のパルスをカウントし、前記カウントの値が自局アドレスと一致するタイミングの制御データ信号を得るアドレス抽出手段と、
前記一連のパルス状信号に、前記アドレス抽出手段から前記制御データ信号が引き渡されたタイミングで、自局からの情報として監視データ信号を重畳する監視データ送信手段と、
前記一連のパルス状信号において、前記監視データ信号を重畳するための領域とは異なる、複数のパルス状信号で構成される管理データ領域に、前記親局で重畳された管理制御データを抽出する管理制御データ抽出手段と、
前記管理制御データを構成する信号が重畳される出力データ期間に対応する同一周期の入力データ期間に自局からの情報として管理監視データ信号を重畳する管理監視データ送信手段と、
前記管理制御データ抽出手段からアドレスデータを得て、前記アドレスデータが自局アドレスと一致するときに前記管理監視データ送出手段に自局の個別特定データを引き渡す個別特定データ出力手段を備えることを特徴とする子局ターミナル。
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