KR20160003549A - Communication abnormality detecting apparatus, communication abnormality detecting method and program - Google Patents

Communication abnormality detecting apparatus, communication abnormality detecting method and program Download PDF

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KR20160003549A
KR20160003549A KR1020150054175A KR20150054175A KR20160003549A KR 20160003549 A KR20160003549 A KR 20160003549A KR 1020150054175 A KR1020150054175 A KR 1020150054175A KR 20150054175 A KR20150054175 A KR 20150054175A KR 20160003549 A KR20160003549 A KR 20160003549A
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South Korea
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communication
voltage
master device
slave
detecting
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KR1020150054175A
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Korean (ko)
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KR101613100B1 (en
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다이스케 구키타
마코토 후쿠다
마사카즈 모리
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세이부덴키 가부시키가이샤
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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
    • H04L43/0823—Errors, e.g. transmission errors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0686—Additional information in the notification, e.g. enhancement of specific meta-data
    • 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
    • H04L43/06—Generation of reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40221—Profibus

Abstract

The present invention provides a communication abnormality detecting device and the like that can automatically detect an abnormality of a communication line even if the standard observation of the communication line is not prepared as standard, for example, PROFIBUS communication.
The detecting section 31 of the communication abnormality detecting device 7 constantly observes the communication voltage in the communication line between the master device 3 and the slave device 5 1 . When the communication voltage becomes less than the set value, the notification unit 33 notifies the master device 3 of the ID for identifying the slave device as the communication partner, in addition to the warning. The master device 3 displays an abnormality on the display unit 15 to display a maintenance warning of a specific part and displays the maintenance warning on the display unit 23 of the slave device 5 specified by the ID . This makes it possible to improve the water retention even in, for example, PROFIBUS communication.

Description

Technical Field [0001] The present invention relates to a communication abnormality detecting apparatus,

The present invention relates to a communication abnormality detecting device, a communication abnormality detecting method and a program, and more particularly to a communication abnormality detecting device for detecting abnormality in communication performed between a master device and a plurality of slave devices.

In recent years, for example, a PROFIBUS communication system has been employed to control a plurality of electrically operated valve actuators (hereinafter referred to as "VA"). In PROFIBUS communication, the master device communicates with a plurality of VAs in series. In PROFIBUS communication, the observation of the communication line is not standardized. When operating the VA group using such PROFIBUS communication, the communication line was monitored by connecting a dedicated analyzer and a communication analyzing device on a regular basis.

Patent Document 1 discloses a system for controlling valves and the like, in which parameters are collected and a statistical model is generated to realize quality prediction and fault detection.

Japanese Patent Application Laid-Open No. 2013-084251

However, in the technique of Patent Document 1, the operation of each device is evaluated by using a statistical model with respect to the parameters collected by communication, and quality prediction and fault detection are performed. The communication line is the basis of communication of each device and does not directly detect an abnormality in the communication line.

For example, in PROFIBUS communication, the communication voltage is attenuated by an increase in wiring resistance and an increase in contact resistance of each slave device. If the wiring resistance and the contact resistance increase at a certain position, the slave device on the upstream side (master device side) than the relevant position can exist on the downstream side (the side opposite to the master device) The slave device becomes a communication voltage that is attenuated, and there is a high possibility that communication becomes impossible. When such a failure is detected by the master device, it is generally determined that the master device is out of order, and the person in charge of the field manages and maintains the entire device as a target, which is a considerable burden.

Therefore, it is an object of the present invention to provide a communication abnormality detecting device and the like which can automatically detect an abnormality of a communication line even if the standard observation of the communication line is not prepared, for example, in PROFIBUS communication.

A first aspect of the present invention is a communication system in which communication is performed between a master device and a plurality of slave devices and includes a communication error detection device for detecting an abnormality in communication performed between the master device and a plurality of slave devices, Wherein the communication abnormality detecting device comprises detecting means for detecting a communication voltage between the master device and at least one of the slave devices if the communication voltage is expected to be smaller than the set voltage or smaller than the set voltage, And notifying means for notifying the warning information to the user.

A second aspect of the present invention is the communication system according to the first aspect, wherein the plurality of slave devices include one or a plurality of first slave devices connected to the master device via a communication line, And a second slave device communicating with the master device via the master device, wherein the detecting device detects a rising or falling voltage value of a square wave in a communication line between the master device and the first slave device Thereby detecting the communication voltage.

A third aspect of the present invention resides in a communication system according to the first or second aspect, wherein the detection means monitors identification information for identifying a slave device as a communication target together with the communication voltage, Notifies the master device of identification information for specifying a communication partner in the communication in addition to the warning information, and when the master The apparatus includes communication means for notifying that the slave device specified by the identification information is communicated by the communication, and when the slave device is notified that the slave device has been notified of the warning information, And a display unit for displaying the information.

A fourth aspect of the present invention is the communication system according to any one of the first to third aspects, wherein the notifying means compares the previously detected communication voltage with the communication voltage detected thereafter, 1 is set in the first setting range, and when the attenuation of the communication voltage exceeds the first setting range, warning information is notified to the master device and / or the communication voltage difference with the adjacent slave device is within the second setting range And notifies the master device of the warning information if the communication voltage difference exceeds the second setting range.

A fifth aspect of the present invention is a communication abnormality detection method for detecting an abnormality in communication performed between a master device and a plurality of slave devices, characterized by comprising: a detection step of detecting a communication voltage between the master device and at least one slave device And a notification step of notifying the master device of the warning information if the communication voltage is expected to be smaller than the set voltage or smaller than the set voltage.

According to a sixth aspect of the present invention, there is provided a computer-readable storage medium storing a program for causing a computer to function as: detecting means for detecting a communication voltage in communication between a master device and at least one slave device; A warning means for notifying the master device of warning information.

Further, the present invention may be grasped as a computer-readable recording medium that normally records the program of the sixth aspect.

The set voltage, the first set range, and the second set range may be stored in the storage means provided in the communication abnormality detecting apparatus.

According to the respective aspects of the present invention, a communication abnormality detecting device is added in the PROFIBUS communication system or the like so that the communication abnormality detecting device always detects the communication voltage in the communication line between the master device and the slave device, It is possible to always predict the occurrence of a decrease in the communication voltage in the communication line between the master device and the slave device and the occurrence of the failure even if the normal observation of the communication line is not prepared in the standard specification.

Further, according to the second aspect, for example, some slave devices (first slave devices), such as serial communication, connect and communicate directly with the master device (i.e., without passing through other slave devices) When the device (second slave device) communicates via the first slave device, the communication voltage at the communication line between the master device and the first slave device is always detected, so that the communication voltage It is possible to generate and predict abnormality of the abnormality.

According to the third aspect, by specifying the slave device in which the occurrence / prediction of the lowering of the communication voltage is detected, it is possible to easily identify the portion where the wiring resistance and the contact resistance increase. Further, the identification information for specifying the communication partner is used for communication, that is, in a virtual space. Therefore, by providing a display unit in each slave device and indicating that an abnormality has occurred in the slave device that has performed communication when a decrease in the communication voltage is detected, the field person in charge can easily identify the faulty site can do.

Further, according to the fourth aspect, by comparing the communication voltage detected in the past with the slave device detected in the past by using the communication voltage continuously detected by the normal detection, or by using the communication voltage difference with the adjacent slave device, Can be accurately predicted. As a result, it is possible to perform preliminary repair by the remediation plan, and the occurrence of unexpected failures can be suppressed. Here, the adjacent slave device of a slave device is a device that directly communicates with the slave device, and communicates with the master device via the slave device, or communicates with the master device via the slave device.

1 is a block diagram showing an example of a configuration of a communication system according to an embodiment of the present invention.
2 is a flowchart showing an example of the operation of the communication system of Fig.
Fig. 3 is a graph showing the communication voltage detected by the detection unit of Fig. 1, and is a diagram showing (a) normal case and (b) abnormal state.
4 is a graph showing an example of the square of the communication voltage difference between adjacent slave devices.
5 is a diagram showing an example of a voltage value when a communication voltage abnormality detecting apparatus monitors a rise of a square wave of a communication voltage and reads a voltage value.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, the embodiments of the present invention are not limited to the following embodiments.

[Example]

1 is a block diagram showing an example of a configuration of a communication system according to an embodiment of the present invention. The communication system 1 comprises a master device 3 (an example of a "master device" of the claims) and a plurality of slave devices 5 1 , ..., 5 N (an example of a "slave device" (N is a natural number of 2 or more, the subscripts may be omitted hereafter), and a communication abnormality detecting device 7 (an example of the "communication abnormality detecting device" of the present claims).

In Fig. 1, the master device 3 and the slave device 5 perform PROFIBUS communication, and perform serial communication. The master device 3 communicates directly with the slave device 5 1 (that is, without passing through other slave devices) (the slave device 5 1 is an example of the "primary slave device" of the present application and the other slave devices 5) is an example of the "secondary slave device" of the present application). The slave device 5 1 directly communicates with the master device 3 and the slave device 5 2 . The slave devices 5i (i is a natural number of 2 or more and N-1 or less) communicate with the slave devices 5i-1 and 5i + 1 . And the slave device 5 N communicates with the slave device 5 N-1 . The slave device of the adjacent slave device 51 is a slave device 52. Adjacent slave device of the slave device is a slave device 5 i 5 i-1 and i + 1 5. Adjacent slave device of the slave device is a 5 N 5 N-1 slave device.

[0024]

The master device 3 includes a communication unit 11, a monitoring unit 13, and a display unit 15. The slave device 5 includes a communication unit 21, a display unit 23, and a control unit 25. The communication abnormality detecting device 7 includes a detecting unit 31, a notifying unit 33, and a storing unit 35. [

The communication unit 11 of the master device 3 communicates with the communication unit 21 of the slave device 5 and controls the operation of each slave device 5. [ Each slave device 5 is given a number (ID) for identification. The master device 3 communicates with the slave device 5 specified by the ID. At the time of communication, information including an ID is included in order to specify a communication partner. Therefore, the detection unit 31 can detect the slave device that is the communication partner by detecting the ID.

The slave device 5 is a motorized valve actuator VA, and the control unit 25 performs valve control or the like in accordance with an instruction from the master device 3.

Detecting a communication failure detecting apparatus 7 (31) detects the voltage on the communication line between the communication with the slave device (51) for direct communication with the master unit 3, and a master device (3). The detecting unit 31 detects the communication voltage by reading the rising or falling voltage value of the square wave in the communication (refer to FIG. 5). The detecting section 31 detects the ID of the slave device 5 in the communication, thereby specifying the slave device 5 as the communication partner.

The storage unit 35 stores a set value (an example of the "set voltage" For PROFIBUS communication, communication is performed at DC 5V, and the set value is set to 2.5V, for example. The notifying unit 33 notifies the master device 3 of the occurrence of a drop in the communication voltage when the detected communication voltage is smaller than the set value. At this time, the notifying unit 33 notifies the ID of the slave device 5 together.

Further, the storage section 35 stores the first setting range (an example of the "first setting range" The notifying unit 33 notifies the master device 3 that an important check is necessary if the square of the difference between the measured value and the previous measured value exceeds the first setting range in the same slave device. At this time, the notifying unit 33 notifies the ID of the slave device 5 together.

Further, the storage section 35 stores the second setting range (an example of the "second setting range" The notifying unit 33 notifies the master device 3 that an important check is necessary if the square of the difference between the measured value and the measured value of the adjacent slave device exceeds the second setting range. At this time, the notifying unit 33 notifies the ID of the slave device 5 together.

The monitoring unit 13 displays the warning information on the display unit 15 and notifies a field person in charge of a maintenance warning of a specific part and informs the display unit 23 of the slave device 5 specified by the ID A maintenance notice can be displayed by displaying that an abnormality has occurred. The field person in charge identifies the communication instability portion by referring to the display on the display portion 23 of the slave device 5, and manages and maintains communication circuits around the communication instability portion. As a result, the water retention property can be improved.

Fig. 2 is a flowchart showing an example of the operation of the communication system 1 of Fig. The detecting section 31 of the communication abnormality detecting device 7 monitors the communication voltage (step ST1). At this time, the ID and the voltage level are monitored. Then, it is determined whether an abnormality in the communication voltage is detected or predicted (step ST2). As described above, the abnormality of the communication voltage can be detected by, for example, when the notifying section 33 determines whether or not the measured value exceeds the set value, or if the square of the difference between the present measured value and the previous measured value is the first setting Range or whether or not the square of the difference between the present measurement value and the measured value of the adjacent slave device exceeds the second setting range and determines whether to notify the warning information. In addition, the necessity of exchange can also be determined by considering the history. If there is no abnormality in the voltage level, the process returns to step ST1.

If the voltage level is abnormal, the monitoring unit 13 of the master device 3 outputs an ID detected at the time of voltage drop detection and a warning of a voltage drop (step ST3). The monitoring unit 13 displays an abnormality on the display unit 15 and notifies the communication unit 11 of the occurrence of a voltage abnormality in the communication unit 21 of the slave device 5 specified by the ID ). In the slave device to which the voltage abnormality is notified, it is indicated that an abnormality has occurred in the display unit 23 (step ST5). The field person in charge can easily specify the slave device 5 whose abnormality has been detected by the display of the display section 23 of the slave device 5 and manages the surrounding communication circuit around the slave device 5 So that the voltage drop abnormality can be easily recovered (step ST6). Then, the process returns to step ST1.

3 is a graph showing the communication voltage, and shows (a) a normal case and (b) an abnormal case. In Fig. 3, the horizontal axis represents the slave devices connected in series from the master device in order, and the vertical axis represents the communication voltage detected in the communication between the master device and each slave device. The communication voltage may decrease as the communication voltage drops compared to the adjacent VA on the downstream side if there is a variation in the branch line resistance of each VA. Therefore, except for a few exceptions, in principle, the communication voltage drops as the slave device passing therethrough increases. (a) In the normal case, it is 2.5 V or more over the whole. If an abnormality occurs, the voltage of any slave device is 2.5 V or more, but if it exceeds that, it becomes 2.5 V or less. Therefore, there is a high possibility that communication becomes impossible. However, this 2.5 V has a deviation of measurement and is set as a threshold value in consideration of the deviation, and the possibility of completely becoming incommunicable is low. Therefore, it is notified that a communication voltage abnormality has occurred in the slave device in which an abnormality has occurred by using the communication. For example, when a plurality of slave devices less than the set value are detected, the slave device having the highest communication voltage value detected at least below the set value may display a communication voltage drop. For example, it may be displayed on the slave device having the highest communication voltage value among slaves having a communication voltage value of 2.5 V or less, or may be notified to a predetermined number of slave devices in descending order of voltage value and displayed. Further, it may be displayed on all the slave devices less than the set value.

4 is a graph showing the square of the adjacent communication voltage difference. The abscissa represents the slave device, and the ordinate represents the square of the communication voltage difference with the adjacent slave device. When the second setting range is set to 0.02 or less, the slave device 5 whose vertical axis value is larger than 0.02 is subjected to the next periodic inspection. It is not recognized in Fig. Likewise, if the square of the difference between the square of the adjacent difference of the measured value obtained from the regular measurement and the square of the difference from the previous measurement is greatly exceeded the tolerance specified by the system (for example, 3 * 3 = 9 <10 to 10 times ) Output warning information.

5 shows an example in which the voltage value is read by monitoring the rise of the square wave of the communication voltage. As shown in Fig. 5, it is possible to detect the communication voltage by monitoring the voltage level of the square wave in the communication.

The present invention is not limited to the configuration as shown in Fig. 1. For example, there are a plurality of slave devices which directly connect to the master device 3, such as a tree structure, A communication voltage may be detected between a plurality of slave devices directly connected to the device and the degradation may be detected.

1: communication system 3: master device
5: slave device 7: communication error detection device
11: communication unit 13:
15: display unit 21:
23: display section 25:
31: detecting section 33:
35:

Claims (6)

A communication system in which communication is performed between a master device and a plurality of slave devices,
And a communication abnormality detecting device for detecting an abnormality in communication performed between the master device and the plurality of slave devices,
The communication abnormality detecting device includes:
Detecting means for detecting a communication voltage between the master device and at least one slave device;
And notification means for notifying the master device of warning information if the communication voltage is expected to be smaller than the set voltage or smaller than the set voltage. The method according to claim 1,
Wherein the plurality of slave devices include one or a plurality of first slave devices connected to the master device via a communication line and a second slave device communicating with the master device via the first slave device,
Wherein the detecting means detects the communication voltage by reading a rising or falling voltage value of a square wave in a communication line between the master device and the first slave device. 3. The method according to claim 1 or 2,
Wherein the detecting means monitors identification information for identifying a slave device to be communicated together with the communication voltage,
Wherein said notifying means notifies the master device of the warning information and an identification for specifying a communication partner in the communication when it is detected that the communication voltage is lower than or equal to the set voltage, Information,
Wherein the master device has communication means for notifying that slave devices specified according to the identification information are notified of the warning information by communication,
And the slave device has a display unit for displaying that the warning information is notified when it is notified that the warning information has been notified. 4. The method according to any one of claims 1 to 3,
Wherein:
Determines whether or not the attenuation of the communication voltage is within the first set range by comparing the previously detected communication voltage with the communication voltage detected thereafter and if the attenuation of the communication voltage exceeds the first set range, Or notifies whether or not the communication voltage difference between the adjacent slave devices is within the second setting range, and notifies the master device of the warning information if the communication voltage difference exceeds the second setting range Communication system. A communication abnormality detection method for detecting an abnormality in communication performed between a master device and a plurality of slave devices,
A detecting step of detecting a communication voltage between the master device and at least one slave device;
And notifying the master device of warning information if the communication voltage is expected to be smaller than the set voltage or lower than the set voltage. Computer,
Detecting means for detecting a communication voltage in communication between the master device and at least one slave device;
And notifying the master device of warning information if the communication voltage is expected to be smaller than the set voltage or smaller than the set voltage.
KR1020150054175A 2014-07-01 2015-04-17 Communication abnormality detecting apparatus, communication abnormality detecting method and recording media KR101613100B1 (en)

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