JP2017219926A - Sensor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor system capable of promptly dealing with a failure of an apparatus and the like.SOLUTION: A communication system comprises a master apparatus 20, and a plurality of sensor slave apparatuses 10 (11 to 15) each having a determination unit. The plurality of sensor slave apparatuses are attached to a plurality of measurement objects F1 to F5 respectively. Each of the plurality of sensor slave apparatuses includes: a sensor unit 101 for detecting a state quantity of the measurement object; a communication unit 102 for transmitting a sensor signal which is an output of the sensor unit; and an alarm unit 103 which operates when the sensor signal is determined as a failure. The master apparatus receives sensor signals respectively transmitted from the plurality of sensor slave apparatuses and transmits the sensor signals to a management device 40. The determination unit is installed on at least one of the plurality of sensor slave apparatuses and master apparatus and determines whether a failure of the measurement object exists on the basis of the sensor signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sensor system including sensor slave units individually attached to a plurality of measurement objects.

  Conventionally, a sensor data collection system using a wireless network between a parent device and a child device is known (see, for example, Patent Document 1). When this type of sensor data collection system is applied to a manufacturing site such as a factory, for example, communication is performed between a plurality of sensor slave units that detect the state of each of a plurality of line facilities and the plurality of sensor slave units. Each line facility is centrally managed through a management device (server) wirelessly connected to the parent device.

JP 2014-107762 A

  In the sensor data collection system described above, when an abnormality is recognized in a part of the line equipment, the abnormality is notified to the operator or the maintenance company via the sensor slave unit, the master unit, and the management device. In this way, the state of individual line facilities based on the outputs of multiple sensor slave units is managed centrally via a management device, and the manager is usually waiting at a location different from the site. Therefore, when an abnormality occurs in some line facilities, there is a risk that the response to the abnormality will be delayed. In particular, when an abnormal situation with a high degree of urgency occurs, it is impossible to take a quick response.

  In view of the circumstances as described above, an object of the present invention is to provide a sensor system capable of quickly responding to an abnormality of a device.

In order to achieve the above object, a communication system according to an aspect of the present invention includes a plurality of sensor slave units, a master unit, and a determination unit.
The plurality of sensor slave units are individually attached to a plurality of measurement objects. The plurality of sensor slave units include a sensor unit that detects a state quantity to be measured, a communication unit that transmits a sensor signal that is an output of the sensor unit, and an alarm that is activated when the sensor signal is determined to be abnormal. Each with a container.
The master unit receives the sensor signals transmitted from the plurality of sensor slave units, and transmits the sensor signals to the management device.
The determination unit is provided in at least one of the plurality of sensor slave units and the master unit, and determines whether there is an abnormality in the measurement target based on the sensor signal.

  In the above sensor system, it is possible to determine an abnormality of a measurement target in a plurality of slave units or a master unit, and to notify the abnormality by operating an alarm device of the sensor slave unit related to the abnormality. Rapid response is possible.

The determination unit is provided in each of the plurality of sensor slave units, and activates the alarm unit of the sensor slave unit attached to the measurement target when the abnormality of the measurement target is determined based on the sensor signal. Also good.
As a result, each sensor slave unit can self-diagnose whether there is an abnormality, and can quickly issue an alarm when an abnormality occurs.

The plurality of sensor slave units may include a first sensor slave unit, a second sensor slave unit, and a third sensor slave unit.
The first sensor slave unit includes a first sensor unit that detects a state quantity of a first measurement target, and a first communication unit that transmits a first sensor signal that is an output of the first sensor unit. And have.
The second sensor slave unit includes a second sensor unit that detects a state quantity of the second measurement target, and a second communication unit that transmits a second sensor signal that is an output of the second sensor unit. And have.
The third sensor slave unit is configured to be communicable with a third sensor unit that detects a state quantity of a third measurement target, and the first and second communication units, and the first and second sensor units are configured to communicate with each other. A third communication unit which receives a sensor signal and transmits the first and second sensor signals and a third sensor signal which is an output of the third sensor unit to the base unit; And a control unit that determines whether the first to third measurement objects are abnormal by comparing the three sensor signals with each other.
Thereby, it is possible to quickly detect a sensor slave unit in which the sensor signal deviates greatly from other sensor slave units.

The first sensor slave unit and the second sensor slave unit are configured to be able to communicate with each other, and the third sensor slave unit includes the first and second sensors via the second sensor slave unit. May be configured to receive the sensor signal.
Thereby, even when the communication state between the first sensor slave unit and the third sensor slave unit is poor, the sensor signal can be exchanged.

The control unit may be configured to determine an abnormal level of a sensor signal indicating abnormality among the first to third sensor signals.
Thereby, it is possible to issue an alarm according to the abnormal level.

  In this case, the third sensor slave unit is configured to request the sensor slave unit related to the abnormality to transmit the sensor signal at a higher transmission frequency as the abnormality level of the sensor signal indicating the abnormality is higher. May be.

  The state quantity of the measurement target to be detected is not particularly limited. For example, the plurality of sensor slave units are configured to detect a state quantity related to the temperature or vibration of the measurement target.

  According to the present invention, it is possible to quickly cope with an abnormality of a device.

1 is a schematic configuration diagram of a sensor system according to an embodiment of the present invention. It is a block diagram which shows the hardware constitutions of some sensor subunit | mobile_units in the said sensor system. It is a block diagram which shows the hardware constitutions of the other one part sensor subunit | mobile_unit in the said sensor system. It is a flowchart explaining typical operation | movement of the said sensor subunit | mobile_unit. It is a flowchart explaining typical operation | movement of the management apparatus which manages the said sensor system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a sensor system according to an embodiment of the present invention. In the present embodiment, an application example of the sensor system to a production line such as a factory will be described.

[overall structure]
The sensor system 100 of this embodiment includes a sensor network 10N including a plurality of sensor slave units 10 and a master unit 20. The sensor system 100 may further include a plurality of relay devices 30 that relay between the sensor network 10N and the parent device 20. The relay device 30 may be omitted as necessary. In this case, communication between the sensor network 10N and the parent device 20 is performed directly.

  The plurality of slave slave units 10 are individually attached to the plurality of line facilities F1 to F5 that are measurement targets, and individually detect the operation state of the facilities. Here, the case where the number of the sensor slave units 10 and the facilities F1 to F5 is five will be described as an example, but the number of the sensor slave units 10 and the facilities is not limited to this. In the following description, the sensor slave units 10 attached to the facilities F1 to F5 are also referred to as sensor slave units 11 to 15, respectively. However, the sensor slave units 11 to 15 are referred to as the sensor slave units 10 except when individually described. Collectively.

  Examples of the facilities F1 to F5 include a product testing device and an inspection device, but are not limited thereto, and may be an assembly device, a processing device, or the like. In addition, the facilities F1 to F5 are all the same type of facility, but are not limited to this, and different types of facilities may be included. The state of the equipment F1 to F5 detected by the sensor slave unit 10 includes events that appear externally when the operation of the equipment F1 to F5 is abnormal, such as vibration, temperature, noise, light emission, and the like.

  The plurality of sensor slave units 10 are configured by communication devices each having a sensor unit 101, a communication unit 102, an alarm device 103, an internal battery (not shown), and the like.

  The sensor unit 101 is configured by a sensor that detects a state quantity related to the temperature, vibration, etc. of the facilities F1 to F5, for example. Specifically, a temperature sensor, an acceleration sensor, or the like is used. In the present embodiment, the sensor unit 101 includes a temperature sensor and an acceleration sensor, but is not limited thereto, and may include at least one sensor according to the type of measurement object, measurement content, and the like.

  The communication unit 102 includes an antenna, a communication circuit, and the like that can wirelessly transmit and receive information to and from the plurality of adjacent sensor slave units 10 or the master unit 20 (relay unit 30). The communication unit 102 transmits a sensor signal that is an output of the sensor unit 101 at a predetermined frequency (for example, once every several seconds to several tens of minutes). The predetermined frequency may be variably controllable. The sensor signal includes device information (ID) individually given to the sensor slave units 11 to 15, detection time, transmission time, and the like. The communication method is not particularly limited, such as near field communication such as “Wi-Fi (registered trademark)”, “Bluetooth (registered trademark)” using several hundred MHz to several GHz band, NFC (Near Field Communication), etc. Proximity wireless communication may be employed.

  The alarm device 103 is for informing the workers in the factory of abnormalities in the facilities F1 to F5. The alarm device 103 is provided with a display lamp such as an LED (Light Emitting Diode), a buzzer for sounding an alarm sound, and an alarm. It consists of a display or the like that displays the mark. The alarm device 103 may be configured to be able to output different alarms depending on the alarm level (abnormal level). The alarm device 103 is configured to operate in response to an abnormality signal transmitted when an abnormality of the facility is determined based on the output of the sensor unit 11. Further, each sensor slave unit 10 may have a function of forcibly stopping the measurement target that is being operated without being performed by the operator when the abnormal level is equal to or higher than a predetermined level.

  In the example of FIG. 1, the base unit 20 receives the sensor signal of the sensor unit 11 of each sensor slave unit 10 from the sensor network 10N via the relay unit 30. Base unit 20 includes an antenna, a communication circuit, and the like that can wirelessly transmit and receive information to and from relay unit 30. The communication method is not particularly limited, and typically a communication method similar to that of the communication unit 102 described above is employed.

  The parent device 20 is further configured to be able to communicate with the management device 40. The base unit 20 transmits a detection signal including the sensor signal of each sensor slave unit 10 received via the relay unit 30 to the management device 40. The communication method between the parent device 20 and the management device 40 is not particularly limited, and may be the same communication method as that of the communication unit 102 described above, or may be connected via the Internet.

  The management device 40 is configured to be communicable with the parent device 20, and receives, processes, and accumulates the detection signal transmitted from the parent device 20. The management device 40 is configured as a management server that manages a production line, and is installed in a management room or a maintenance company in a factory. The management device 40 individually determines whether or not each of the facilities F1 to F5 detected through the plurality of sensor slave units 10 is abnormal, and if any of the facilities is found to be abnormal, the facility is notified to the administrator. Predetermined warning processing such as displaying information prompting stoppage or inspection on the monitor is executed.

[Sensor network]
Next, details of the sensor network 10N will be described.

  As described above, the sensor network 10N includes a plurality of sensor slave units 10, and is configured to be able to communicate between the plurality of sensor slave units 10. In the sensor network 10N, a sensor signal (first sensor signal) transmitted from one sensor slave unit (first sensor slave unit) is received by another adjacent sensor slave unit (second sensor slave unit). The sensor signal (second sensor signal) of the second sensor slave unit is the first sensor signal, and another sensor slave unit (third sensor slave unit) adjacent to the second sensor slave unit. Configured to be sent to. The third sensor slave unit transmits a detection signal including its own sensor signal (third sensor signal) and the first and second sensor signals to the master unit 20 (relay unit 30). The third sensor signals are compared with each other to determine whether there is an abnormality in each facility.

  In this embodiment, the sensor network 10N includes five sensor slave units 11 to 15 as shown in FIG. Each of the sensor slave units 11 to 15 is configured to transmit the output (sensor signal 11s to 15s) of each sensor unit 101 at the predetermined frequency.

  For example, the sensor slave unit 11 transmits its sensor signal 11 s to one of the other adjacent sensor slave units 12, 13, and 14. The transmission destination of the sensor slave unit 11 may be fixed or may not be fixed. Typically, the sensor slave unit having the best communication environment as viewed from the sensor slave unit 11 is selected for each transmission. Among these, when transmitting the sensor signal 11s to the sensor slave unit 14, when the sensor slave unit 11 receives at least one of the sensor signals 12s and 13s of the other sensor slave units 12 and 13, Not only the sensor signal 11 s but also the other sensor signals 12 s and 13 s are transmitted to the sensor slave unit 14.

  Similarly, the sensor slave unit 12 transmits its sensor signal 12s to one of the other adjacent sensor slave units 11, 13, and 15. Among these, when transmitting the sensor signal 12s to the sensor slave unit 15, when the sensor slave unit 12 receives at least one of the sensor signals 11s and 13s of the other sensor slave units 11 and 13, Not only the sensor signal 12s but also the other sensor signals 11s and 13s are configured to be transmitted to the sensor slave unit 15. Thereby, for example, even when the communication status between the sensor slave units 11 and 13 and the sensor slave unit 15 is poor, the sensor signals 11s and 13s can be exchanged with these sensor slave units.

  Similarly, the sensor slave unit 13 transmits its own sensor signal 13 s to one of the other adjacent sensor slave units 11, 12, 14, 15. Among these, when transmitting the sensor signal 13s to either of the sensor slave units 14 and 15, the sensor slave unit 13 receives at least one of the sensor signals 11s and 12s of the other sensor slave units 11 and 12. In some cases, not only its own sensor signal 13 s but also the other sensor signals 11 s and 12 s are transmitted to the sensor slave units 14 and 15.

  As described above, the sensor slave units 11 to 13 function as “first sensor slave units” or “second sensor slave units”.

  FIG. 2 is a block diagram illustrating a hardware configuration of the sensor slave units 11 to 13. The sensor slave units 11 to 13 typically have the same configuration, and as shown in the figure, a CPU (Central Processing Unit) 210, a ROM (Read Only Memory) 220, a RAM (Random Access Memory) 230, etc. Have.

  The CPU 210 comprehensively controls each block of the sensor slave units 11 to 13 while performing various arithmetic processes. The CPU 210 has a determination unit 211.

  The determination part 211 of each sensor subunit | mobile_unit 11-13 is comprised so that the presence or absence of abnormality of a measuring object (facility F1-F3) may each be determined based on own sensor signal 11s-13s.

  The sensor slave unit in which the sensor signal is determined to be abnormal in the determination unit 211 operates its own alarm device 103. By the operation of the alarm device 103, it becomes possible to notify the operator working around the equipment related to the abnormality of the abnormality of the equipment.

  In the present embodiment, acceleration information (vibration information) and temperature information to be measured are included as sensor signals, and the presence or absence of abnormality is determined based on these acceleration information and temperature information. Specifically, the determination unit 211 determines that there is some abnormality when at least one of the acceleration and the temperature of the facility exceeds a predetermined value set for each. The predetermined value may be a value indicating a state when the measurement object falls into an abnormality, or may be a value representing a state immediately before falling into an abnormality.

  Note that the sensor signal serving as a determination criterion may include not only information on acceleration and temperature but also information on the remaining amount of the internal battery, for example.

  The ROM 220 includes a non-volatile memory in which an OS (Operating System) to be executed by the CPU 210 and firmware such as programs and various parameters are fixedly stored. The RAM 230 is used as a work area of the CPU 210 and temporarily holds the OS, various applications being executed, and various data being processed.

  The ROM 220 stores programs necessary for sensor signal abnormality determination processing executed by the determination unit 211, drive signal generation processing for operating the alarm device 103, and the like. The RAM 230 may temporarily store its own detected sensor signal and the received sensor signal of another sensor device for abnormality determination or transmission.

  Next, the sensor slave units 14 and 15 will be described.

  The sensor slave units 14 and 15 transmit their sensor signals 14s and 15s to the master unit 20 (relay unit 30). As described above, the sensor signals 11s to 13s of the sensor slave units 11 to 13 are transmitted to one of the sensor slave units 14 and 15. Therefore, the sensor slave units 14 and 15 are configured to transmit not only their own sensor signals 14s and 15s but also the sensor signals 11s to 13s of the other sensor slave units 11 to 13 to the master unit 20 (relay unit 30). Is done. That is, the sensor slave units 14 and 15 function as a “third sensor slave unit” that transmits a detection signal including the sensor signals 11 s to 15 s to the master unit 20.

  Since the sensor slave units 14 and 15 are configured to be able to communicate with each other, only one of the sensor slave units 14 and 15 is configured to transmit a sensor signal to the master unit 20 (relay unit 30). May be. For example, when the communication environment with the master unit 20 (relay unit 30) is not good at the time of transmission of the sensor slave unit 14, the sensor signal 14s of the sensor slave unit 14 is transmitted to the master unit 20 (via the sensor slave unit 15). You may make it transmit to the relay machine 30).

  FIG. 3 is a block diagram showing a hardware configuration of the sensor slave units 14 and 15. The sensor slave units 14 and 15 have the same configuration as the sensor slave units 11 to 13 and include a CPU (Central Processing Unit) 310, a ROM (Read Only Memory) 320, a RAM (Random Access Memory) 330, and the like.

  The CPU 310 functions as a control unit that comprehensively controls each block of the sensor slave units 14 and 15 while performing various arithmetic processes. The CPU 310 includes a determination unit 311 and a signal generation unit 312.

  Similar to the determination unit 211 in the sensor slave units 11 to 13, the determination unit 311 is configured to determine whether there is an abnormality in the measurement target (facility F4, F5) based on its own sensor signals 14s and 15s. .

The determination unit 311 is further configured to determine whether there is an abnormality in the facilities F1 to F5 by comparing the received other sensor signals 11s to 13s and the own sensor signals 14s and 15s with each other.
Since each of the sensor slave units 11 to 15 can detect only its own sensor signal, it cannot be compared with the sensor signals of other sensor slave units. Therefore, in the present embodiment, relative to the sensor slave units 14 and 15 that receive a plurality of sensor signals, how much their own sensor signals differ from other sensor signals or how much they deviate. A determination unit 311 is provided for making a determination. Thereby, all the sensor signals 11s to 15s can be more objectively evaluated, and the sensor slave unit (equipment) indicating an abnormality can be easily identified.

  For example, when the sensor slave unit 14 receives the sensor signals 11s to 13s of the sensor slave units 11 to 13, the sensor slave unit 14 (CPU 310) receives all the sensor signals 11s to 14s including its own sensor signal 14s. 20 (relay machine 30), and the sensor signals 11s to 14s are compared with each other to determine the presence or absence of a sensor signal including data indicating a predetermined abnormal value. Even when the sensor slave unit 15 receives the sensor signals 11s to 13s, the sensor slave unit 15 performs the same processing as described above.

  Even if the sensor slave units 14 and 15 do not receive all of the sensors 11s to 13s, the sensor slave units 14 and 15 determine whether there is an abnormality by comparing any of the received sensor signals with their own sensor signals 14s and 15s. Configured as follows. Further, when one of the sensor slave units 14 and 15 does not receive any of the sensor signals 11s to 13s (when the other receives all of the sensor signals 11s to 13s), the one sensor slave unit is It transmits its own sensor signal to the other sensor slave unit. Thereby, in the other sensor slave unit, it is possible to determine whether there is an abnormality in the sensor signal of the one sensor slave unit.

  As described above, in the present embodiment, the acceleration information (vibration information) of the equipment and the temperature information are included as sensor signals, and whether or not there is an abnormality based on a relative comparison between the acceleration information and the temperature information between the sensor slave units 11-15. Is determined. The sensor signal serving as a determination reference may include not only information related to acceleration and temperature, but also information related to the remaining amount of the internal battery, for example. Thereby, for example, it is possible to distinguish whether a sensor signal indicating an abnormal value is due to an abnormal operation of the equipment or an abnormality of the sensor slave unit itself.

  The determination unit 311 may be configured to determine an abnormal level of a sensor signal indicating abnormality among the sensor signals 11s to 15s. In this case, at least two or more threshold values are set for the determination of the abnormal level, and the level of the sensor signal determined to be abnormal (for example, a minor abnormality that does not require an urgent response or an urgent response) It is determined whether or not the abnormality is severe. Such processing may be executed in the unique self-diagnosis processing in each of the sensor slave units 11 to 15 described above.

  When the determination unit 311 determines that at least one of the sensor signals 11s to 15s is abnormal, the signal generation unit 312 is configured to generate an abnormal signal that identifies a sensor slave unit related to the abnormality.

  The sensor slave units 14 and 15 are configured to transmit the abnormal signal generated by the signal generation unit 312 to the sensor slave unit having the sensor unit 101 that has transmitted the sensor signal determined to be abnormal. The abnormality signal may be directly transmitted to the sensor slave unit related to the abnormality, or may be transmitted via another sensor slave unit. When the determination unit 311 determines an abnormal level, an abnormal signal including information related to the abnormal level is transmitted. The sensor slave unit related to the abnormality is not limited to any one of the sensor slave units 11 to 13, and includes the case where the sensor slave unit 14 or 15 performs the abnormality determination.

  The sensor slave unit that has received the abnormal signal activates its own alarm device 103. When abnormal level information is included in the abnormal signal, the alarm device 103 outputs an alarm corresponding to the abnormal level. By the operation of the alarm device 103, it becomes possible to notify the operator working around the equipment related to the abnormality of the abnormality of the equipment.

  Furthermore, the signal generation unit 312 may include a signal including a request to increase the frequency of transmission of the sensor signal to the sensor slave unit related to the abnormality according to the abnormality level. For example, the signal generation unit 312 generates an abnormal signal including an instruction to transmit the sensor signal at a higher transmission frequency as the abnormal level of the sensor signal indicating abnormality is higher. The sensor slave units 14 and 15 transmit the detection signal to the master unit 20 with a higher transmission frequency as the abnormal level of the sensor signal is higher with respect to the sensor slave unit related to the abnormality. Thereby, more data regarding the sensor slave unit related to the abnormality can be acquired.

  The communication unit 102 receives sensor signals from the sensor slave units 11 to 13, transmits and receives sensor signals between the sensor slave units 14 and 15, transmits sensor signals to the master unit 20 (relay unit 30), and sensor elements related to abnormality Transmit abnormal signals to the machine.

  The ROM 320 includes a non-volatile memory in which an OS (Operating System) to be executed by the CPU 310, firmware such as programs and various parameters are fixedly stored. The RAM 330 is used as a work amount area of the CPU 310 and temporarily holds the OS, various applications being executed, and various data being processed.

  The ROM 320 stores programs necessary for sensor signal abnormality determination processing executed by the determination unit 311, abnormal signal generation processing executed by the signal generation unit 212, drive signal generation processing for operating the alarm device 103, and the like. Is done. The RAM 330 may temporarily store its own detected sensor signal and the received sensor signal of another sensor device for abnormality determination or transmission.

[Operation of communication system]
Details of the sensor system 100 of the present embodiment will be described together with typical operations of the sensor system 100.

(Basic flow)
FIG. 4 is a flowchart for explaining typical operations of the sensor slave units 11 to 15.

  The sensor slave units 11 to 15 obtain the sensor signals 11s to 15s of the respective sensor units 101 (step 101). The CPUs 210 and 310 of each of the slave units 11 to 15 compare the acquired sensor signals (acceleration information and temperature information) with predetermined values (G, T), and determine that they are abnormal if they are equal to or higher than the predetermined values. The device 103 is operated (steps 102 to 104).

  For example, an increase in vibration due to deterioration with time of bearings and other various sliding parts, and an increase in temperature due to overload and insufficient lubrication are individually diagnosed in each sensor slave unit 11-15. And when the output which shows an abnormal value is recognized, the alarm device 103 act | operates.

  Next, the sensor slave units 11 to 15 transmit the acquired sensor signal (data) regardless of the result of the abnormality determination (step 105). Among these, the sensor signals 11s to 13s are transmitted to the master unit 20 together with the sensor signals 14s and 15s via any one of the sensor slave units 14 and 15.

  On the other hand, the sensor slave units 14 and 15 compare the sensor signals 11s to 15s with each other to determine the presence or absence of these abnormalities. This determination is typically executed at the time of waiting for transmission to the parent device 20, when the equipment is stopped, or the like. When the CPU 310 determines that there is a sensor signal indicating an abnormal value in the sensor signals 11s to 15s or a sensor signal including data deviating from other sensor signals, the CPU 310 generates an abnormal signal and relates to the abnormality. Send to the sensor slave unit. Upon receiving the abnormal signal, the sensor slave unit outputs an alarm corresponding to the abnormal level to prompt the worker on site to take a response. When the abnormal level is severe, the operation of the facility to which the sensor slave unit is attached is stopped.

  When the sensor slave unit 14 or 15 finds a sensor slave unit exhibiting an abnormal value, the sensor slave unit 14 or 15 includes, in the abnormal signal, a request for changing the alarm mode, the transmission interval, or the like for the sensor slave unit related to the abnormality. Can do.

Specifically, when the operation states of the facilities F1 to F5 are normal, each sensor slave unit 11 to 15 acquires a sensor signal at a frequency of once every 5 minutes, for example, and executes the abnormality determination.
As a result of judgment, if the emergency level is relatively low, abnormal level 1 (detection acceleration: 2.5 gal (0.0025G, seismic intensity 2 equivalent) or higher, detection temperature: 40 ° C or higher), the LED is turned on as an alarm, and the transmission frequency is set Raise to once every 3 minutes.
In case of abnormal level 2 (detection acceleration: 8.0 gal (0.008G, seismic intensity 3 equivalent) or higher, detection temperature: 50 ° C or higher), in addition to lighting with LED, buzzer sounds and transmission frequency is increased to once per minute .
In the case of abnormal level 3 (detection acceleration: 25 gal (0.025G, seismic intensity 4 equivalent) or more, detection temperature: 60 ° C or more), the equipment is forcibly stopped by the sensor slave unit, the LED and buzzer are activated, and the transmission frequency To once every 30 seconds.
In case of abnormal level 4 (detection acceleration: 80 gal (0.08G, seismic intensity 5 equivalent) or more, detection temperature: 65 ° C or more), the equipment is forcibly stopped by the sensor slave unit, the LED and buzzer are operated, and the transmission frequency Increase to once every 10 seconds.

  FIG. 5 is a flowchart for explaining a typical operation of the management apparatus 40.

  The management apparatus 40 receives the sensor signals 11s to 15s of the sensor slave units 11 to 15 from the master unit 20 (step 201). The management device 40 accumulates the received sensor signals 11s to 15s in time series, and determines whether there is an abnormality (step 202). If an abnormality is recognized in the data, the management device 40 displays the abnormality on a predetermined monitor or the like and alerts the administrator (step 204).

  As described above, according to the present embodiment, since the abnormality in the operation state of each of the facilities F1 to F5 is temporarily determined in the sensor slave units 11 to 15, an output indicating an abnormal value is recognized. If it is, the operator at the site can be immediately inspected via the alarm device 103 and prompt action can be taken.

  Further, in addition to the above self-diagnosis function by each sensor slave unit 11-15, since the sensor signals 11s-15s between the sensor slave units are compared with each other, abnormality determination of the sensor slave units 11-15 itself is performed. It is also possible to check the remaining battery level, etc., and to realize autonomous abnormality monitoring in the sensor network 10N.

[Other Embodiments]
In above-mentioned embodiment, although it comprised so that the sensor subunit | mobile_unit 11-15 performed abnormality determination of the state quantity of each installation F1-F5, the sensor signal 11s-15s of each sensor subunit | mobile_unit 11-15 is received. The base unit 20 may be configured to determine whether there is an abnormality based on the sensor signals 11s to 15s.
In this case, the configuration of each of the sensor slave units 11 to 15 can be simplified, and the power consumption required for the abnormality determination can be reduced, so that the life of the built-in battery can be extended. Even in such a configuration, autonomous abnormality monitoring can be realized in the sensor system 100 without using the management device 40.

Moreover, in the above embodiment, it is comprised so that all the sensor signals 11s-15s of each sensor subunit | mobile_unit 11-15 may be transmitted to the main | base station 20 (management apparatus 40) irrespective of the presence or absence of abnormality of the installation F1-F5. However, when the facilities F1 to F5 are normal, only the minimum information is transmitted to the parent device 20, and when the abnormality determination is made, detailed information regarding the facilities related to the abnormality is the parent device 20 (management device 40). It may be configured to be transmitted to.
Thereby, the communication load between the sensor network 10N and the parent device 20 can be reduced.
For example, when normal, the sensor signals 11s to 15s are transmitted to the base unit 20 at a frequency of once every hour, and the self-diagnosis and mutual comparison of the sensor signals 11s to 15s are performed during the transmission waiting time. The signals 11 s to 15 s are configured to be transmitted to the parent device 20.

  As mentioned above, although embodiment of this invention was described, this invention is not limited only to the above-mentioned embodiment, Of course, a various change can be added.

  For example, in each of the above-described embodiments, the example in which the sensor system of the present invention is applied to the state monitoring of a plurality of line facilities installed in a factory has been described. It may be a device or the like.

In the above embodiment, each of the sensor slave units 11 to 15 uses an internal battery as a power source, but in addition to this, an energy harvesting device (energy harvest) capable of self-power generation such as solar power generation or vibration power generation. May be provided. In this case, it becomes possible to request switching of the power source from the internal battery to the energy harvesting device to the sensor slave unit in which the battery residual pressure is remarkably reduced by the mutual comparison of the sensor signals in the sensor slave units 14 and 15. . Thereby, consumption of an internal battery can be prevented and the replacement time of an internal battery can be made the same in all the sensor slave units.
Or an internal battery may be abbreviate | omitted and an energy harvesting device may be used for the electric power source of each sensor subunit | mobile_unit.

  Furthermore, although the above embodiment demonstrated the example in which the sensor subunit | mobile_units 11-13 all have the determination part 211, abnormality of sensor signal 11s-13s is compared by the mutual comparison of the sensor signals 11s-15s in the sensor subunit | mobile_units 14 and 15. Since the presence / absence can be determined, any one, two, or all of the sensor slave units 11 to 13 may not include the determination unit 211.

DESCRIPTION OF SYMBOLS 10 (11-15) ... Sensor subunit | mobile_unit 10N ... Sensor network 20 ... Main | base station 30 ... Relay machine 40 ... Management apparatus 100 ... Sensor system 101 ... Sensor part 102 ... Communication part 103 ... Alarm 211,311 ... Determination part 310 ... Control part F1-F5 ... Measurement object (line equipment)

Claims (7)

A sensor unit that detects a state quantity of a measurement target, a communication unit that transmits a sensor signal that is an output of the sensor unit, and an alarm that is activated when the sensor signal is determined to be abnormal, Multiple sensor slave units individually attached to the measurement target,
A master unit that receives each of the sensor signals transmitted from the plurality of sensor slave units and transmits the sensor signal to a management device;
A sensor system comprising: a determination unit that is provided in at least one of the plurality of sensor slave units and the master unit and determines whether there is an abnormality in the measurement target based on the sensor signal. The sensor system according to claim 1,
The determination unit is provided in each of the plurality of sensor slave units, and activates the alarm device of the sensor slave unit attached to the measurement target when the abnormality of the measurement target is determined based on the sensor signal. system. The sensor system according to claim 1 or 2,
The plurality of sensor slave units are:
A first sensor slave unit having a first sensor unit that detects a state quantity of a first measurement target and a first communication unit that transmits a first sensor signal that is an output of the first sensor unit When,
A second sensor slave unit having a second sensor unit that detects a state quantity of a second measurement target and a second communication unit that transmits a second sensor signal that is an output of the second sensor unit When,
A third sensor unit that detects a state quantity of a third measurement object, and the first and second communication units are configured to be communicable, receive the first and second sensor signals, and A third communication unit that transmits a second sensor signal and a third sensor signal that is an output of the third sensor unit to the parent device and the first to third sensor signals are compared with each other. And a third sensor slave unit having a control unit that determines whether there is an abnormality in the first to third measurement objects. The sensor system according to claim 3,
The first sensor slave unit and the second sensor slave unit are configured to be able to communicate with each other,
The third sensor slave unit receives the first and second sensor signals via the second sensor slave unit. The sensor system according to claim 3 or 4,
The said control part determines the abnormal level of the sensor signal which shows abnormality among the said 1st-3rd sensor signals. The sensor system according to claim 5,
The third sensor slave unit requests the sensor slave unit related to abnormality to transmit sensor signals at a higher transmission frequency as the abnormality level of the sensor signal indicating the abnormality is higher. The sensor system according to any one of claims 1 to 6,
The plurality of sensor slave units detect a state quantity related to temperature or vibration of a measurement target.

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