WO2013073004A1 - 入力信号異常検出方式、およびその方式に使用する子局ターミナル - Google Patents
入力信号異常検出方式、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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- WO2013073004A1 WO2013073004A1 PCT/JP2011/076262 JP2011076262W WO2013073004A1 WO 2013073004 A1 WO2013073004 A1 WO 2013073004A1 JP 2011076262 W JP2011076262 W JP 2011076262W WO 2013073004 A1 WO2013073004 A1 WO 2013073004A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/17—Detection of non-compliance or faulty performance, e.g. response deviations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
- H04Q2209/82—Arrangements in the sub-station, i.e. sensing device where the sensing device takes the initiative of sending data
- H04Q2209/823—Arrangements in the sub-station, i.e. sensing device where the sensing device takes the initiative of sending data where the data is sent when the measured values exceed a threshold, e.g. sending an alarm
Definitions
- the present invention reduces the number of signal lines between a master station connected to a control unit and a plurality of slave stations corresponding to a plurality of controlled devices, connects them with a common data signal line, and synchronizes them with a transmission clock.
- BACKGROUND OF THE INVENTION 1 Field of the Invention The present invention relates to an input signal abnormality detection method for detecting an insensitive state of a signal at an input unit in a slave station and a slave station terminal used for the method in a control / monitor signal transmission system that transmits data by a transmission synchronization method.
- a control system including a control unit and a plurality of controlled devices
- so-called wiring saving which reduces the number of wirings
- a general technique for reducing the wiring 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 method is widely adopted in which a station and a plurality of slave stations are connected to a control unit and a controlled device, respectively, and data is transferred between the master station and the plurality of slave stations via a common data signal line using a serial signal. Yes.
- control unit cannot identify the signal sensitivity insufficiency state of the input unit in a state where many slave stations are connected, it is far from the control unit.
- Each of the slave stations needs to be checked, and it takes a lot of man-hours to detect an insensitive state of the signal at the input unit in the slave station.
- the present applicant applies the remote wiring check system disclosed in Japanese Patent Application Laid-Open No. 2011-114449 as a system for identifying the insufficient sensitivity of the signal at the input unit in the slave station on the control unit side. I am considering that.
- this remote wiring check system in a control / monitor signal transmission system having a single control unit and a plurality of controlled devices, between a master station and a slave station connected by a reduced data signal line.
- a management data area including connection data indicating a wiring state is provided, which is different from a control / monitor data area composed of control data (output data) and monitoring data (input data) transmitted in both directions simultaneously.
- connection data short-circuit information, disconnection information, and normal information are identified. Therefore, it is possible to easily check the wiring connection state of the slave station without reducing the input data (monitoring data) capacity of the signal.
- the ON or OFF state of the OUT terminal to which the output device (output unit) is connected is changed by OUT data serially communicated with the master unit (master station).
- a function for acquiring start time information, a function for acquiring stop time information when the ON or OFF state of the IN terminal to which the input device (input unit) is connected, and start time information and stop time information A slave (slave station) having a calculation function for calculating an operation time of an output device based on the above is disclosed. According to this slave (slave station), the operation time of the output device or input device is obtained and compared with the setting information for specifying the normal range of the output device or input device. It is possible to determine whether it is normal or whether the replacement time is approaching.
- the present invention provides a control / monitor signal transmission system in which a master station and a plurality of slave stations are connected by a common data signal line and data is transmitted by a transmission cycle method.
- An object of the present invention is to provide an input signal abnormality detection method capable of detecting a signal insensitivity state and a slave station terminal used for the method.
- the common data signal line A management data area different from the control / monitor data area composed of the data of the control data signal and the data of the monitor data signal is provided in the transmission signal transmitted to the mobile station, and the slave station corresponds to the signal level of the input unit.
- the data When the data is larger than the lower limit threshold and smaller than the upper limit threshold, it is determined as an abnormal state, and based on the result determined as the abnormal state, an insufficient sensitivity state of the signal of the input unit is detected, and the management data area Is superimposed on a signal constituting data indicating the insensitive state.
- the slave station determines that the sensitivity is insufficient when the integrated value of the number of times determined as the abnormal state exceeds a first threshold value.
- the slave station determines that the sensitivity is insufficient when the number of times that the abnormal state is determined per predetermined time is greater than a second threshold value.
- the management data area includes data indicating an error type determined to be a normal state or an insufficient sensitivity state, and a signal level of the input unit.
- the transmission signal on which a signal composed of data corresponding to is superimposed is transmitted to the master station.
- the management data area includes a management control data area on which data from the master station is superimposed and a management monitoring data area on which data from the slave station is superimposed.
- a slave station terminal is connected to a common data signal line to which a master station is connected, and a transmission signal transmitted through the common data signal line includes a control data signal data and a monitoring data signal data.
- Management control data extracting means for extracting management control data superimposed on the master station in a management data area different from the control / monitoring data area composed of: management monitoring data as information from the own station in the management data area
- Management monitoring data transmission means for superimposing a signal, and when the data corresponding to the signal level of the input unit is larger than the lower threshold and smaller than the upper threshold, an abnormal state is determined, and based on the result determined as the abnormal state Input signal abnormality detection that delivers the data indicating the insufficient sensitivity state to the management monitoring data transmitting means when detecting the insufficient sensitivity state of the signal of the input unit Equipped with a stage.
- the insensitivity detection means includes a gate means, and the gate means switches the data corresponding to the signal level of the input unit and the number-of-times data determined as the abnormal state to the management monitoring data transmission means. It may be output.
- the slave station determines that the data corresponding to the signal level of the input unit is larger than the lower threshold and smaller than the upper threshold, and is determined to be abnormal. Based on the result, a control / monitoring signal in which data is transmitted by a transmission synchronization method in order to detect an insensitive state of the signal of the input unit and superimpose a signal constituting data indicating the insensitive state in the management data area. In the transmission system, it is possible to detect an insufficient sensitivity state of the signal at the input unit in the slave station on the master station side.
- the slave station determines that the sensitivity is insufficient. Therefore, if the number of times determined as abnormal is increased, the sensitivity of the input unit signal is insufficient. Signs that the condition has become chronic can be detected. For example, the number of chronic insensitive states caused by a decrease in the detection sensitivity of the optical light receiving element, a decrease in the luminance of the optical element, or a chronic condition caused by incomplete connection due to deterioration of the signal line connecting the element and the detection circuit It can be determined when the integrated value of the number of times of the insufficient sensitivity state exceeds the first threshold.
- the slave station determines that the sensitivity is insufficient.
- a shortage condition can be detected. For example, when the signal level of the input unit temporarily shows an abnormal value due to electrical noise (motor noise), optical noise (turbulence), magnetic noise, or the like in the surrounding environment of the input unit, erroneous detection occurs. These erroneous detections due to external noise can be determined when the number of abnormal states per predetermined time is greater than the second threshold.
- the slave station When the slave station detects an insufficient sensitivity state of the signal of the input unit, the slave station corresponds to the data indicating the type of error determined to be normal state or insufficient sensitivity state in the management data area and the signal level of the input unit. A transmission signal in which a signal composed of data is superimposed is transmitted to the master station. As a result, it is possible for the master station side to grasp the lack of sensitivity at the slave station.
- the data extracted from the management monitoring data area at the parent station is “0”. It can be said that the information output from the slave station is not transmitted to the master station via the common data signal line. Therefore, at that time, it can be determined that the common data signal line is disconnected, and it is possible to detect the disconnection of the common data signal line in addition to the state of insufficient sensitivity in the slave station.
- the slave station terminal includes a management signal different from a control / monitor data area composed of control data signal data and monitor data signal data in a transmission signal transmitted via a common data signal line.
- Management control data extracting means for extracting management control data superimposed on the master station in the area
- management monitoring data transmitting means for superimposing a management monitoring data signal as information from the own station on the management data area, and signals of the input unit
- the data corresponding to the level is larger than the lower limit threshold and smaller than the upper limit threshold, it is determined as an abnormal state, and the sensitivity is detected when an insensitive state of the signal of the input unit is detected based on the result determined as the abnormal state.
- the present invention is suitable for the input signal abnormality detection method according to the present invention, because it includes the input signal abnormality detection means for transferring the data indicating the deficiency state to the management monitoring data transmission means.
- the insensitivity detection means includes a gate means, and the gate means switches and outputs the data corresponding to the signal level of the input unit and the number-of-times data determined to be abnormal to the management monitoring data transmission means.
- the gate means switches and outputs the data corresponding to the signal level of the input unit and the number-of-times data determined to be abnormal to the management monitoring data transmission means.
- the control / monitor signal transmission system includes a single master station 2 connected to the control unit 1 and the common data signal lines DP and DN (hereinafter also referred to as transmission lines), It is composed of a plurality of input / output slave stations 5, output slave stations 6 and input slave stations 7 connected to 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 4, the output slave station 6, and the input slave station 7 are provided with a signal output process for the output unit 8 that operates in response to an output instruction from the control unit 1 and an input unit 9 that incorporates input information to the control unit 1.
- the output unit 8 is, for example, an actuator, a (stepping) motor, a solenoid, a solenoid valve, a relay, a thyristor, or a lamp.
- the input unit 9 is, for example, a reed switch, a micro switch, a push button switch, or a photoelectric switch. And various sensors.
- the input / output slave station 4 is connected to a controlled device 5 including an output unit 8 and an input unit 9, the output slave station 6 is connected only to the output unit 8, and the input slave station 7 is connected only to the input unit 9.
- the output slave station 6 may include an output unit 8 (output unit integrated slave station 80), and the input slave station 7 includes an input unit 9 (input unit integrated slave station). 90).
- the control unit 1 is, for example, a programmable controller, a computer, or the like, and includes an output unit 11 that sends out control data 13 and management control data 14, data 15 of monitoring data signals from the input / output slave station 4 and the input slave station 7, and
- the input unit 12 receives the first management monitoring data 16 and the second management monitoring data 17.
- These output unit 11 and input unit 12 are connected to the master station 2.
- management judging means 18 for calculating data transmitted from the output unit 11 based on 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, and an input data unit 26.
- a control data signal (hereinafter referred to as a transmission clock signal) that is connected to the common data signal lines DP and DN and is a series of pulse signals corresponding to the transmission signal of the present invention is referred to as the common data signal lines DP and DN.
- Monitoring data signals transmitted from the input / output slave station 4, the output slave station 6, or the input slave station 7 (hereinafter referred to as "slave stations 4, 6, 7" when referring to all of these),
- the monitoring data 15, the first management monitoring data 16 and the second management monitoring data 17 extracted from the monitoring data signal are sent to the input unit 12 of the control unit 1.
- 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 a storage unit 29 that stores an IDX address table in which information on each of the slave stations 4, 6, and 7 is aggregated.
- the IDX address table is data for specifying at least one of the input / output slave station 4, the output slave station 6, and the input slave station 7 corresponding to the output unit 8 or the input unit 9 to be checked for failure.
- the head addresses of the slave stations 4, 6, and 7 are used.
- FIG. 7 shows an example of an IDX address table using the head address.
- 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 of 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 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 generation unit 23, the control data generation unit 33 applies a series of data to the common data signal lines DP and DN via the line driver 34. 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 / monitoring data area includes control data signal data OUTn (n is an integer) sent from the master station 2 and monitor data signal data INn (n is an integer) sent from the input / output slave station 4 or the input slave station 7. ).
- the pulse of the transmission clock signal has a high potential level (+ 24V in this embodiment) in the second half of one cycle and a low potential level (+ 12V in this embodiment) in the first half.
- the pulse width interval of the first half of the pulse that becomes the level becomes the output data period, and the first half of the pulse that becomes the 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 of the low potential level is extended 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 the management control data signal transmitted from the master station 2 is superimposed and a management data area in which the management monitoring data signal transmitted from the slave stations 4, 6, and 7 is superimposed. Consists of monitoring data area.
- the management control data transmitted by the management control data signal is composed of the first management control data ISTo and the second management control data IDXo, and is expressed as a pulse width interval of a low potential level, like the data OUTn of the control data signal. .
- the management monitoring data transmitted by the management monitoring data signal is composed of the first management monitoring data STi and the second management monitoring data IDXi. Like the monitoring data signal data INn, the management monitoring data ST Expressed as presence or absence.
- the first management control data ISTo and the second management control data IDXo are instruction data for specifying the type of data requested to the slave stations 4, 6, 7, or the slave stations 4, 6, 7 Address data for specifying any one of these.
- the first management monitoring data STi and the second management monitoring data IDXi are type data indicating that the input signal is in a normal sensitivity state, or type data indicating an abnormality that the input signal is in a low sensitivity state, and at that time Input level monitoring data in normal or abnormal state, or data indicating the monitoring result of the number of insufficient sensitivity states according to the type of error, and data other than “0” is always transmitted as management monitoring data The details will be described later.
- 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 monitoring signal detection means 35 and monitoring data extraction means 36.
- the monitoring signal detection means 35 detects the monitoring data signal and the management monitoring data signal transmitted from the slave stations 4, 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 / absence of a current superimposed on the low potential level.
- the start signal ST is transmitted, first, the input / output slave station 4 Alternatively, the monitoring data signal is sequentially received from each of the input slave stations 7, and subsequently, the management monitoring data signal is received from any one of the slave stations 4, 6, and 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 32. Then, the monitoring data signal data is sent to the input data unit 26 as serial input data 37. Management monitoring data 39 extracted from the management monitoring data signal is also sent to the input data unit 26.
- the input data unit 26 converts the serial input data 37 received from the master station input unit 25 into parallel data, and sends it as monitoring data 15 to the input unit 12 of the control unit 1. Further, the management monitoring data 39 received from the master station input unit 25 is separated into the first management monitoring data 16 and the second management monitoring data 17 and sent to the input unit 12.
- the input slave station 7 corresponds to the first slave station terminal of the present invention.
- the transmission receiver 41, the management control data extraction means 42, the address extraction means 43, the address setting means 44, A slave station input / output unit 70 having a management monitoring data transmission unit 46, a monitoring data transmission unit 47, an A / D converter 48, an input unit 49, and a lack of sensitivity detection unit 50, and an input unit 9 are provided.
- the input slave station 7 of this embodiment includes an MCU that is a microcomputer control unit as an internal circuit, and this MCU functions as the slave station input unit 70.
- MCU 70 Calculations and storages required for the processing are executed using the CPU, RAM, and ROM provided in this MCU (hereinafter referred to as MCU 70), and each processing of each of the above-mentioned means constituting the slave station input unit 70 is performed.
- MCU 70 The relationship between the CPU, the RAM, and the ROM in FIG.
- 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 unit 42 extracts the management control data signal data from the management data area of the transmission clock signal, and delivers them to the lack of sensitivity detection unit 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 the own station address data set by the address setting means 44. A control data signal is delivered to the transmission means 47.
- 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 71 to the monitoring data transmission unit 47 is obtained by A / D converting the input signal from the input unit 9 by the A / D converter 48. Is connected based on a current signal or a voltage signal indicating "on" or "off" of the switch.
- 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. Then, based on the data delivered from the insensitivity detection 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 lack of sensitivity detection means 50 includes an ISTo extraction means 51, an IDXo extraction means 52, a slave station address designation detection means 54, a comparison means 55, a lower limit threshold storage means (TK1) 551, an upper limit threshold storage means (TK2) 552, integrated value calculation means 56, frequency calculation means 57, encoding means 58, and gate means 59.
- the ISTo extraction unit 51 extracts the first management control data ISTo from the data of the management control data signal delivered from the management control data extraction unit 42 and delivers it to the slave station address designation detection unit 54. Further, the IDXo extracting unit 52 extracts the second management control data IDXo from the management control data signal data delivered from the management control data extracting unit 42 and delivers it to the slave station address designation detecting unit 54. Further, the local station address data is delivered from the address setting means 44 to the slave station address designation detection means 54.
- the slave station address designation detection unit 54 encodes the error monitor command data 542 into the encoding unit 58. To hand over.
- the slave station address designation detection means 54 compares the data value of the second management control data IDXo with the data value of the local station address, and when it matches, is data indicating an error monitor command for instructing monitoring of an insensitive state of the input signal. In some cases, the error monitor command data 542 is delivered to the encoding means 58.
- the slave station address designation detecting means 54 is an input monitor when the first management control data ISTo is data indicating an input monitor command for instructing monitoring of an input signal or data indicating a disconnection detection command for a transmission line.
- the command data 543 is delivered to the gate means 59.
- the comparison unit 55 includes a signal level of serial data delivered from the input unit 49, a lower limit threshold value set in advance and recorded in the lower limit threshold value storage unit (TK1) 551, and a preset upper limit threshold value storage unit (TK2).
- An abnormal state of the input signal is detected by comparing with the upper threshold value recorded in 552.
- the lower threshold value is set to a value at which “off” “(or“ on ”) of the input level due to insufficient sensitivity is determined to be abnormal when the serial data signal level is higher than that, and the upper threshold value is set to the serial threshold value.
- a value is set for determining that the input level “on” ⁇ ⁇ ⁇ (or “off”) due to insufficient sensitivity is an abnormal state.
- the comparison unit 55 determines that the abnormal state is based on the comparison result, the comparison unit 55 outputs a signal indicating the fact to the integrated value calculation unit 56 and the frequency calculation unit 57.
- the integrated value calculating means 56 calculates the integrated value of the number of times that the comparing means 55 has determined an abnormal state based on the output signal from the comparing means 55. When the calculated integrated value exceeds a preset first threshold value, the signal level of the serial data delivered from the input unit 49 is determined to be in a state of insufficient sensitivity. When the frequency calculation means 56 determines that the sensitivity is insufficient, the frequency calculation means 56 indicates integration error information indicating that the sensitivity is determined to be insufficient due to the integrated value error, and the integrated value data of the number of times the comparison means 55 determines that the abnormality is detected. Are output to the encoding means 58. On the other hand, if it is not determined that the sensitivity is insufficient, information indicating a normal state is output to the encoding unit 58.
- the frequency calculation means 57 calculates the number of times that the comparison means 55 has determined an abnormal state per predetermined time, that is, the frequency at which the comparison means 55 has determined an abnormal state. When the calculated frequency exceeds a preset second threshold, the signal level of the serial data delivered from the input unit 49 is determined to be in a state of insufficient sensitivity. When the integrated value calculating means 57 determines that the sensitivity is insufficient, the frequency error information indicating that the sensitivity is determined to be insufficient due to the frequency error and the frequency data indicating the frequency determined by the comparing means 55 to be in the abnormal state. Are output to the encoding means 58. On the other hand, if it is not determined that the sensitivity is insufficient, information indicating a normal state is output to the encoding unit 58.
- the encoding means 58 receives the second management control data IDXo delivered from the slave station address designation detection means 54, that is, the address match data 541. Based on the above, the data output from the frequency calculation means 56 and the integrated value calculation means 57 is converted into predetermined code data and delivered to the management monitoring data transmission means 46.
- the gate means 59 transmits the monitor signal data of the input signal level based on the serial data delivered from the input means 49 to the management monitoring data. Deliver to means 46.
- the control unit 1 outputs management control data 14 for instructing detection of a transmission line disconnection detection or a state of insufficient sensitivity to the master station 2 at an appropriately set timing or by an arbitrary input instruction by a user. Receiving this, the master station 2 designates one of the first management control data ISTo requesting transmission line disconnection detection or lack of sensitivity information and one of the data groups stored in the IDX address table. Management control data IDXo is output.
- the designation of data in the IDX address table by the second management control data IDXo is in accordance with the table number. That is, first, the index address data (# ad0) of the table number 1 is selected and output as the second 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 data of the IDX address table is designated by the second management control data IDXo is not limited, and may be in accordance with the priority order by function, for example.
- each of the slave stations 4, 6, and 7 is detected by the integrated value calculation means 56 or the frequency calculation means 57 to be in an insensitive state or normal.
- the accumulated error information, the frequency error information, or the information indicating the normal state, which is the error type of the insufficient sensitivity state is used as the first management monitoring data STi
- the second management control data IDXo matches the own station address
- the monitoring signal data of the input signal level obtained from the input means 49 is set as the second management monitoring data IDXi through the gate means 59 at the timing of the input monitoring command data 543, and the management monitoring data signal is superimposed on the management monitoring data area.
- the master station 2 extracts the first management monitoring data 16 and the second management monitoring data 17 from the management monitoring data signal and delivers them to the control unit 1.
- predetermined processing is executed according to the contents of the first management monitoring data 16 and the second management monitoring data 17. Specifically, if the error type indicated by the first management monitoring data 16 is accumulated error information or frequency error information, the control unit 1 displays an abnormality. Moreover, if the 1st management monitoring data 16 is information which shows a normal state, the control part 1 will not perform abnormality display. Further, the control unit 1 extracts monitor signal data of the input signal level as the second management monitoring data 17 and performs monitor display. If the first management monitoring data 16 indicates integration error information that is an error type, the control unit 1 sends error monitor command data indicating a request for integrated value data that is the number of times of insufficient sensitivity to the master station 2.
- Management control data 14 is transmitted as the first management control data ISTo.
- the control unit 1 indicates to the master station 2 error monitor command data indicating a request for frequency data that is the number of times of insufficient sensitivity. Is sent as the first management control data ISTo.
- the master station 2 that has received the management control data 14 indicating the request for the integrated value data or the frequency data from the control unit 1 subsequently receives error monitor command data for requesting the integrated value data or the frequency data, which is the number of times of insufficient sensitivity.
- the common data signal line DP is used as the first management control data ISTo and as the second management control data IDXo specifying the address for specifying the slave stations 4, 6, and 7 that returned the first management monitoring data STi indicating the abnormality. , Send a transmission signal to DN.
- Each of the slave stations 4, 6, and 7 connected to the common data signal lines DP and DN is data indicating an error monitor command in which the first management control data ISTo is a request for the number of times that the input signal is insensitive.
- the second management control data IDXo is compared with the data value of the own station address.
- the second management control data IDXo and the data value of the own station address match, the integrated value data or frequency data which is the number of times the input signal is insensitive, according to the type of data indicating the error monitor command
- the second management monitoring data IDXi the error type data indicating the integrated value data or the frequency data is superimposed as the first management monitoring data STi in the management monitoring data area, and the common data signal lines DP and DN are superimposed on each other.
- the master station 2 extracts the first management monitoring data 16 and the second management monitoring data 17 from the management monitoring data signal and delivers them to the control unit 1.
- predetermined processing is executed according to the contents of the first management monitoring data 16. Specifically, if the first management monitoring data 16 indicates an abnormality, an abnormality display is performed. If the management monitoring data is “0”, it is determined that the common data signal line is disconnected, and a message to that effect is displayed.
- control unit 1 can grasp whether or not there is a lack of sensitivity for each of the slave stations 4, 6, and 7. Further, when there is a lack of sensitivity state, the integrated value and frequency of the number of times determined as an abnormal state by the comparison means 55 can be grasped, so the cause of the lack of sensitivity state is specified to some extent from the contents of the data. be able to.
- the lower limit threshold, the upper limit threshold, the first threshold, and the second threshold can be appropriately changed from the control unit side.
- the data indicating that the lower limit threshold, the upper limit threshold, the first threshold, and the second threshold are changed, and the changed lower limit threshold, upper limit threshold, first threshold, and second threshold data are stored in the management control data area. Superimpose them and extract them on the slave stations 4, 6, 7 side.
- Control Unit 2 Master Station 4 Input / Output Slave Station 5 Controlled Device 6 Output Slave Station 7 Input Slave Station 8 Output Unit 9 Input Unit 11 Output Unit 12 Input Unit 13 Control Data 14 Management Control Data 15 Monitoring Data Signal Data 16 One management monitoring data 17 Second management monitoring data 18 Management judgment means 21 Output data part 22 Management data part 23 Timing generation part 24 Parent station output part 25 Parent station input part 26 Input data part 29 Storage means 31 OSC (oscillation circuit) 32 Timing generation means 33 Control data generation means 34 Line driver 35 Monitoring signal detection means 36 Monitoring data extraction means 37 Input data 39 Management monitoring data 40 Slave station input / output unit 41 Transmission reception means 42 Management control data extraction means 43 Address extraction means 44 Address setting means 46 Management monitoring data transmission means 47 Monitoring data transmission means 48 A / D converter 49 Input means 50 Insufficient sensitivity detection means 51 ISTo extraction means 52 IDXo extraction means 54 Slave station address designation detection means 541 Address match data 542 Error monitor Command data 543 Input monitor command data 55 Comparison means 551 Lower threshold
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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(以下、伝送ラインということがある)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。
管理データ部22には、すでに図7のIDXアドレスデータテーブルが作成されているものとする。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、第二管理制御データIDXoによって、順次子局4、6、7の全てに対し割り付けられた先頭アドレスを指定していく。
2 親局
4 入出力子局
5 被制御装置
6 出力子局
7 入力子局
8 出力部
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 監視データ信号のデータ
16 第一管理監視データ
17 第二管理監視データ
18 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
29 記憶手段
31 OSC(発振回路)
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
39 管理監視データ
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
46 管理監視データ送信手段
47 監視データ送信手段
48 A/D変換器
49 入力手段
50 感度不足検出手段
51 ISTo抽出手段
52 IDXo抽出手段
54 子局アドレス指定検出手段
541 アドレス一致データ
542 エラーモニタ指令データ
543 入力モニタ指令データ
55 比較手段
551 下限閾値記憶手段(TK1)
552 上限閾値記憶手段(TK2)
56 積算値算出手段
57 頻度算出手段
58 符号化手段
59 ゲート手段
60 子局出力部
61 制御データ抽出手段
62 出力手段
70 子局入力部
71 入力手段
80 出力部一体型子局
90 入力部一体型子局
TR トランジスタ
Claims (7)
- 親局と複数の子局が共通データ信号線で接続され、伝送周期方式によりデータの伝送が行われる制御・監視信号伝送システムにおいて、
前記共通データ信号線に伝送される伝送信号に、制御データ信号のデータと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管理データ領域を設け、
前記子局は、入力部の信号レベルに対応するデータが下限閾値よりも大きく、上限閾値よりも小さい場合に異常状態と判断し、前記異常状態と判断された結果に基づいて、前記入力部の信号の感度不足状態を検出し、前記管理データ領域に前記感度不足状態を示すデータを構成する信号を重畳することを特徴とする入力信号異常検出方式。 - 前記子局は、前記異常状態と判断された回数の積算値が第一閾値を超えたときに、前記感度不足状態と判断することを特徴とする請求項1に記載の入力信号異常検出方式。
- 前記子局は、所定時間当たりの前記異常状態と判断された回数が第二閾値よりも大きいときに、前記感度不足状態と判断することを特徴とする請求項1に記載の入力信号異常検出方式。
- 前記子局は、前記入力部の信号の感度不足状態を検出した場合には、前記管理データ領域に、正常状態または感度不足状態と判定されたエラーの種別を示すデータと前記入力部の信号レベルに対応するデータで構成する信号を重畳した前記伝送信号を前記親局へ送信することを特徴とする請求項2または3に記載の入力信号異常検出方式。
- 前記管理データ領域は、前記親局からのデータが重畳される管理制御データ領域と、前記子局からのデータが重畳される管理監視データ領域とで構成され、感度不足状態の検出時において前記子局から前記管理監視データ領域に重畳されるデータを“0”以外のデータとし、前記親局において前記管理監視データ領域から抽出されたデータが“0”のとき、前記共通データ信号線の断線と判断する請求項1、2、3または4に記載の入力信号異常検出方式。
- 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伝送信号に、制御データ信号のデータと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、
前記管理データ領域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、
入力部の信号レベルに対応するデータが下限閾値よりも大きく、上限閾値よりも小さい場合に異常状態と判断し、前記異常状態と判断された結果に基づいて前記入力部の信号の感度不足状態を検出したときに、前記感度不足状態を示すデータを前記管理監視データ送信手段に引き渡す感度不足検出手段とを備えることを特徴とする子局ターミナル。 - 前記感度不足検出手段は、ゲート手段を備え、
前記ゲート手段は、前記管理監視データ送信手段へ、前記入力部の信号レベルに対応するデータと、前記異常状態と判断された回数データとを切り替えて出力することを特徴とする請求項6に記載の子局ターミナル。
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