JP6263232B2 - Measuring system - Google Patents

Description

  The present invention relates to a measurement system including a plurality of control units connected to a plurality of sensors.

  As a measurement system including a plurality of control units connected to a plurality of sensors, for example, there is a “liquid level measurement system” disclosed in Patent Document 1 below. In this system, a plurality of detection control circuits connected to electrode pairs as sensors are provided, and the plurality of detection control circuits are connected to a calculation circuit configured using, for example, a personal computer ( Patent Document 1; Paragraph 0021).

JP2013-205311A

  In a measurement system including a plurality of control units, such as the “liquid level measurement system” disclosed in Patent Document 1, a host control unit that processes a plurality of control units and sensor data output from the control units (Patent Document) 1 is required to be electrically connected by a cable or the like for the number of control units. For example, when there are 100 control units, it is necessary to wire 100 cables between the upper control unit.

  In particular, when a plurality of control units connected to a plurality of sensors and the host control unit are accommodated in the same casing, it is necessary to secure an accommodation space for a cable connecting the two in the casing. For this reason, depending on the number of cables, the housing may be large, and thus a large number of cables may hinder downsizing of the apparatus and space saving of the space in which the apparatus is installed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a measurement system that can reduce the size of the apparatus and save the installation space.

In order to achieve the above object, a measurement system according to claim 1 of the present invention includes a plurality of first control units connected to a plurality of sensors so as to be able to perform data communication, and the plurality of control units. A plurality of second control units connected to the first control unit so as to be capable of data communication and receiving individual sensor data transmitted by the plurality of sensors or sensor information based on these sensor data from the plurality of first control units; , and a housing accommodating the plurality of first control unit and the plurality of second control units, data communication between the plurality of first control unit the second control unit, the housing wireless data communication takes place in (communication procedure polling method) Ri der one of the second control unit of the plurality of second control unit is the Poli When the polling process of the switching method is not performed, the first control unit that has transmitted the sensor data or the sensor information to the one second control unit among the plurality of first control units A technical feature is that the sensor data or the sensor information is transmitted to another second control unit of the second control units . The “polling process” is a poll frame transmission process from the second control unit to the first control unit when the communication procedure is a polling method.

Data communication between the plurality of first control units and the plurality of second control units is wireless data communication (communication procedure is a polling method) performed in the housing. That is, the plurality of first control units and the plurality of second control units are connected not to be wired but to be wirelessly capable of data communication. Thereby, since it is not necessary to provide a cable for data communication between them, it is not necessary to secure an accommodation space for the cable in the housing. Further, when one second control unit of the plurality of second control units does not perform polling polling processing (when there is no polling processing that should be originally performed, for example), sensor data is stored in this one second control unit. Alternatively, the first control unit that has transmitted the sensor information sends the sensor data or the sensor information to the other second control unit (second control unit that can normally perform polling processing) among the plurality of second control units. Send. Accordingly, the transmission failure of the sensor data or sensor information due to the first control unit continuously transmitting sensor data or sensor information to one second control unit that cannot respond due to a failure or the like, for example. Can be suppressed. In addition, the polling method does not require an accurate time slot unlike the TDMA (Time Division Multiple Access) method, and therefore, it is not necessary to adopt a synchronization procedure that tends to be complicated.

In addition, the measurement system according to the second aspect of the present invention includes a plurality of first control units connected to a plurality of sensors so as to be able to perform data communication, and a plurality of the first control units. A plurality of second control units that receive individual sensor data transmitted from the plurality of sensors and connected to the data communicable or sensor information based on these sensor data from the plurality of first control units, and the plurality of second control units. 1 control unit and a housing for accommodating the plurality of second control units, and data communication between the plurality of first control units and the second control unit is wireless data performed in the housing communication (communication procedure polling method), and part of the second control unit of the plurality of second control unit, said plurality of first control unit The sensor data or the sensor information is received from a part of the first control units, and the remaining second control unit of the plurality of second control units is selected from the plurality of first control units. A technical feature is that the sensor data or the sensor information is received from the remaining first control unit.

In the case where a plurality of (for example, three) second control units are accommodated in the housing, for example, one second control unit among the three second control units is the number of 100 first control units. Sensor data or sensor information is received from 30 first control units, and the other second control unit receives sensors from 30 first control units of the remaining 70 first control units. Data or sensor information is received, and the remaining one second control unit receives sensor data or sensor information from the remaining 40 first control units. Accordingly, it is possible to reduce the load of information processing per unit as compared with a case where one second control unit receives sensor data or sensor information from 100 first control units. That is, load distribution can be performed as compared with the case where the second control unit is single. In addition, the polling method does not require an accurate time slot unlike the TDMA (Time Division Multiple Access) method, and therefore, it is not necessary to adopt a synchronization procedure that tends to be complicated.

Further, the measurement system of the present invention described in claim 3 of the appended claims, a plurality of first control units are respectively connected to a plurality of sensors capable of data communication, in the plurality of first control unit Two second control units that receive individual sensor data transmitted from the plurality of sensors and sensor information based on these sensor data connected to be capable of data communication from the plurality of first control units, and the plurality of the plurality of sensor data A housing for accommodating the first control unit and the two second control units, and data communication between the plurality of first control units and the second control unit is performed within the housing. wireless data communication (communication procedure polling method), and one of the second control unit of said two second control unit, said plurality of first control unit Receive from a portion of the first control unit and the sensor data or the sensor information among the other second control units of said two second control unit, out of the plurality of first control unit When the sensor data or the sensor information is received from the remaining first control unit and the one second control unit does not perform the polling process of the polling method , the some first control units When the sensor data or the sensor information is transmitted to the second control unit, and the other second control unit does not perform the polling process of the polling method , the remaining first control unit A technical feature is that the sensor data or the sensor information is transmitted to a control unit. The “polling process” is a poll frame transmission process from the second control unit to the first control unit when the communication procedure is a polling method.

When two second control units are accommodated in the housing, one second control unit of the two second control units is, for example, 100 first control units (some of the first control units). Sensor data or sensor information is received from 50 first control units of one control unit, and the other second control unit receives the remaining 50 first control units (the remaining first control units). ) Receive sensor data or sensor information. Accordingly, it is possible to reduce the load of information processing per unit as compared with a case where one second control unit receives sensor data or sensor information from 100 first control units. That is, load distribution can be performed as compared with the case where the second control unit is single. In addition, the polling method does not require an accurate time slot unlike the TDMA (Time Division Multiple Access) method, and therefore, it is not necessary to adopt a synchronization procedure that tends to be complicated.

Further, when one of the second control unit does not perform the polling process polled (such as if there is no polling processing to be performed this come), it was sending the sensor data or sensor information to the second control unit of this one the first control unit 50 sets the on the other second control unit (second control unit capable of performing successfully poling treatment, etc.) to the sensor data or sensor information. Further, when the other of the second control unit does not perform the polling process polled (no polling processing to be performed this come etc.), it has been transmitted sensor data or sensor information to the second control unit of the other the first control unit 50 sets transmits the sensor data or sensor information to the one of the second control unit (successfully second control unit capable of performing a polling process, etc.). Thereby, the sensor data by 50 first control units continuously transmitting sensor data or sensor information to one (or the other) second control unit that cannot respond due to a failure or the like, for example. Or the transmission failure of sensor information can be suppressed.

Moreover, the measurement system of this invention described in Claim 4 of Claim is a measurement system as described in any one of Claims 1-3 . WHEREIN: These sensors are stored by the tank of a ship. It is a technical feature that it is a liquid level sensor that detects the position of the liquid level. As a result, in a ship having a limited installation space for on-board equipment (particularly a commercial ship), the effect of downsizing of the casing and the device that eliminates the need for a cable storage space is effective. That is, the effect of reducing the size of the apparatus and saving the installation space is high.

  Since it is not necessary to provide a cable for data communication between the plurality of first control units and the second control unit, it is not necessary to secure an accommodation space for the cables in the housing. Therefore, it is possible to reduce the size of the housing as much as the space for accommodating such cables is unnecessary. Therefore, the apparatus can be reduced in size and the installation space can be saved.

  For example, the transmission failure of sensor data or sensor information due to the first control unit continuously transmitting sensor data or sensor information to one second control unit that cannot respond due to a failure or the like can be suppressed. Therefore, it is possible to avoid the occurrence of a failure caused by one second control unit that has stopped performing such predetermined information processing.

  Compared with the case where the second control unit is single, load distribution is enabled. Therefore, collection and information processing of sensor data or sensor information by the second control unit can be performed at high speed.

It is explanatory drawing which shows the structural example of the measurement system which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the example of the communication procedure between a master and each slave. It is explanatory drawing which shows the example which mounted the measuring system of this 1st Embodiment on the ship. It is explanatory drawing which shows the structural example of the measurement system which concerns on the modification of this 1st Embodiment. It is explanatory drawing which shows the structural example of the measurement system which concerns on 2nd Embodiment of this invention. It is explanatory drawing which shows the example of the communication procedure (at the time of normal) between a master and each slave. It is explanatory drawing which shows the example of the communication procedure (at the time of abnormality) between a master and each slave. It is explanatory drawing which shows the structural example of the measurement system which concerns on the modification of this 2nd Embodiment.

Hereinafter, each embodiment of the measurement system of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a first embodiment of the measurement system of the present invention will be described with reference to FIGS. As shown in FIG. 1, the measurement system 10a according to the first embodiment is mainly configured by a system support panel 11, a CPU 20, a master 30, a node 40, a slave 50, a sensor unit 60, and the like.

  The system support panel 11 is a device rack on which a plurality of units and boards can be mounted, and is sometimes called a system rack. Generally, a metal plate that covers a ceiling surface, a bottom surface, and a side surface is attached to a metal frame, and the front and rear access surfaces are configured to be openable to an external space. In the first embodiment, the CPU 20, master 30, node 40, slave 50, and other units and boards can be accommodated. The system support panel 11 may correspond to a “housing” described in the claims. As long as the CPU 20, the master 30, the node 40, the slave 50, and the like can be accommodated, a sealed type (for example, box-shaped) housing may be used.

  The CPU 20 is, for example, a board-like microcomputer (microcomputer board), and includes an MPU, a memory (DRAM, EEPROM, etc.), an input / output interface, and the like. In some cases, a single-chip microcomputer including an MPU, a memory, and the like, a DSP (Digital Signal Processor), and the like are included.

  In the first embodiment, as will be described later, the CPU 20 outputs operation information of each sensor unit 60 based on sensor data (digital data) sent from each sensor unit 60 via a plurality of nodes 40. Or the sensor data is aggregated or statistically processed and the result is output to the outside. For this reason, a display device (not shown) is connected to the CPU 20, or a higher-level computer system is connected via the cable 80. In addition, program data that allows the MPU to execute such information processing is stored in advance in a memory (such as an EEPROM).

  The master 30 is a wireless communication unit that enables data communication wirelessly. For example, the master 30 includes a wireless unit configured to be able to perform wireless communication at a predetermined frequency, a wireless controller that controls frequency selection and transmission / reception of the wireless unit, an antenna, and the like. Note that the wireless unit, wireless controller, antenna, etc. are not shown. In the first embodiment, the CPU 20 and the master 30 are configured separately. Therefore, the CPU 20 and the master 30 are electrically connected by the cable 13 to enable data communication between them.

  In the first embodiment, the combination of the CPU 20 and the master 30 (in the configuration shown in FIG. 1, the CPU 20 and the master 30 and the cable 13 connecting them) is “second” described in the claims. It can correspond to a “control unit”.

  The node 40 transmits sensor data sent from the sensor unit 60 to the CPU 20 and performs a predetermined initialization process on the sensor unit 60. For this reason, the node 40 is configured, for example, in the form of a board (substrate), for example, in the same manner as the CPU 20 by a sensor controller composed of a one-chip microcomputer or the like. In the first embodiment, one node 40 is provided for one sensor unit 60. That is, the plurality of nodes 40a, 40b, 40c,..., 40n exist as many as the number of sensor units 60, and these can be connected to the sensor units 60a, 60b, 60c,. It is connected. The node 40 does not directly transmit the sensor data sent from the sensor unit 60 to the CPU 20 via the slave 50 or the like, but generates sensor information based on these sensor data and transmits it to the CPU 20. It may be configured. For example, the sensor data may be compared with a predetermined reference value (predetermined threshold value), and pass / fail information (OK or NG) as a comparison result may be output as the sensor information.

  The slave 50 is a wireless communication unit that enables data communication (broken line with double arrows shown in FIG. 1) to the master 30 wirelessly. For this reason, almost the same as the master 30, for example, a radio unit configured to be able to perform radio communication at a predetermined frequency, a radio controller that controls frequency selection, transmission / reception, and the like of the radio unit, an antenna, and the like. The wireless controller of the slave 50 is different from the wireless controller of the master 30 in that identification information (master ID) of the master 30 that should manage itself is registered. It should be noted that the wireless unit, the wireless controller, the antenna, and the like constituting the slave 50 are not shown. In the first embodiment, the node 40 and the slave 50 are integrally configured. Therefore, there are as many slaves 50a, 50b, 50c,..., 50n as there are nodes 40a, 40b, 40c,. In the first embodiment, the combination of the node 40 and the slave 50 can correspond to a “first control unit” recited in the claims.

  In the measurement system 10a configured as described above, as shown in FIG. 2, the master 30 and the slave 50 perform wireless communication in the system support panel 11. Before the description, the connection with the master 30 is established. The procedure will be described. Note that the wireless controller of each of the master 30 and the slave 50 executes connection establishment, polling, and responses (ACK, NACK) to the connection, which will be described below.

  When the power is turned on or the initialization process is executed, the slave 50 first transmits a request command frame requesting establishment of a connection to the master 30 that should manage itself. In addition to the identification information (slave ID) of the slave 50, the identification information (master ID) of the master 30 is added to the request command. Therefore, when the master 30 that has received the connection establishment request command determines that it is a connection establishment request for itself, the master 30 registers the added slave ID and sends a response frame of the connection establishment response to which the slave ID is added. Send. Thereby, since the establishment of the connection between the master 30 and the slave 50 is completed, the master 30 thereafter transmits a poll frame to the slave 50 at a predetermined time interval.

  That is, as shown in FIG. 2, the master 30 (“M” shown in FIG. 2) has a plurality of slaves 50a, 50b, 50c,..., 50n managed by itself (“Sa”, “Sb” shown in FIG. 2). , “Sc”... “Sn”), a poll frame (POL) is transmitted in order. A slave ID that can identify the slave 50 is added to the poll frame. Therefore, each slave 50a, 50b, 50c,..., 50n transmits an ACK (ACKnowledgement) to the master 30 when receiving a poll frame (POL) for itself.

  In the communication procedure shown in FIG. 2, transmission of data (downlink data) from the master 30 to the slave 50 is not assumed. However, for example, command data such as forcibly initializing the sensor unit 60 is transmitted to the master. When transmitting from 30 to the slave 50, NACK (Negative ACKnowledgement; negative response) may be transmitted from the slave 50 to the master 30 in response to an error in data or the like. In addition, even if the master 30 transmits a poll frame to the slave 50, if the corresponding slave 50 does not respond to it (when ACK is not returned), the master 30 transmits alert information of the corresponding slave 50 to the CPU 20. Then, information indicating that the slave 50 is abnormal is transmitted to the CPU 20. Thereby, for example, the CPU 20 displays the failure information of the corresponding slave 50 on the display device (for example, changes the icon of the corresponding slave 50 from green at normal time to red at abnormal time), and notifies the operator of the corresponding slave 50. Notify the failure.

  When sensor data is sent from the connected sensor unit 60 to the slave 50, the slave 50 transmits sensor data ("DATA" shown in FIG. 2) to the master 30 following ACK. In the first embodiment, wireless communication between the master 30 and the slave 50 is performed according to such a communication procedure (polling method). Note that the process of transmitting a poll frame from the master 30 to the slave 50 (polling process) can correspond to “predetermined information processing” described in the claims.

  The measurement system 10a of the first embodiment can be applied to a liquid level sensor mounted on a tanker, for example. That is, in the first embodiment, as shown in FIG. 3, the liquid level sensor 107 detects the liquid level position (liquid level) of the liquid 110 in the cargo tank 105 provided in the hull 101 of the tanker 100. The measurement system 10a is applied to a system that collects data (sensor data) and performs information processing. The liquid level sensor 107 is typically exemplified by an FMCW radar type or an electromagnetic float type, for example. Each of the liquid level sensors 107 (sensor units 60 a, 60 b, 60 c,..., 60 n) is attached to the ceiling 102 that closes the cargo tank 105 partitioned by the partition wall 103. In FIG. 3, a part of the hull 101 is cut and the cross section of the cargo tank 105 is shown in an easy-to-understand manner. In addition, it should be noted that some of the partition wall 103, the cargo tank 105, the liquid level sensor 107, and the liquid 110 are denoted by reference numerals, and some are not denoted.

  The liquid level data (sensor data) detected by each liquid level sensor 107 is connected to each node 40 (nodes 40a, 40a) in the system support panel 11 provided in the installation space for the onboard equipment in the ship via the cable 90. 40b, 40c,..., 40n). As a result, the liquid level data (sensor data) detected by each liquid level sensor 107 is wirelessly transmitted from the slave 50 (slave 50a, 50b, 50c,..., 50n) to the master 30 as described above. Collected by the CPU 20 via the received master 30. The CPU 20 outputs the operation information of each liquid level sensor 107 based on the liquid level data sent from each liquid level sensor 107, or sums up the liquid level data or statistically processes the results, and outputs the result to the outside. To output or display on a display device (not shown).

As described above, according to the measurement system 10a according to the first embodiment, the plurality of nodes 40a to 40n connected to the plurality of sensor units 60a to 60n so as to be able to perform data communication are connected to the nodes 40a to 40n. a CPU20 for receiving a data communication connection movable to and the individual sensor data to be sent multiple sensor units 60a~60n a plurality of sensor units 60a~60 n, system support panel containing a plurality of nodes 40a~40n and CPU20 11. The data communication between the plurality of nodes 40a to 40n and the CPU 20 is connected via the master 30 and the slaves 50a to 50n in the system support panel 11 so that data communication can be performed wirelessly instead of wired. Yes. Accordingly, there is no need to provide a data communication cable between them (reducing the number of wires), and it is not necessary to secure a cable accommodation space in the housing. Therefore, the size of the system support panel 11 can be reduced to the extent that such a cable housing space becomes unnecessary. Therefore, the apparatus can be reduced in size and the installation space can be saved.

  In the measurement system 10a described above, the CPU 20 and the master 30 are configured separately and connected by the cable 13, but the CPU 20 and the master 30 may be configured integrally. That is, as shown in FIG. 4, as a modified example of the measurement system 10a of the first embodiment, the cable 13 in the system support panel 11 may be omitted (measurement system 10b). Thereby, since the number of cables accommodated in the system support panel 11 is reduced in the measurement system 10b as compared with the measurement system 10a described above, it is possible to further reduce the number of lines and make the system support panel 11 smaller. become. Accordingly, it is possible to further reduce the size of the apparatus and save the installation space.

  Also, the measurement system 10b shown in FIG. 4 can be applied to, for example, the liquid level sensor 107 mounted on the tanker 100, similarly to the measurement system 10a.

[Second Embodiment]
Next, 2nd Embodiment of the measurement system of this invention is described based on FIGS. As shown in FIG. 5, the measurement system 10 c of the second embodiment is different from the measurement system 10 a of the first embodiment in that two masters 30 a and 30 b are connected to the CPU 20. Therefore, components that are substantially the same as those of the measurement system 10a according to the first embodiment are denoted by the same reference numerals as those of the measurement system 10a and description thereof is omitted.

As shown in FIG. 5, in the measurement system 10 c of the second embodiment, the two masters 30 a and 30 b are connected to each other by the cable 13 and also to the CPU 20. Accordingly, one master 30a of the two masters 30 can manage, for example, slaves 50a, 50b, and 50c, and the other master 30b can manage, for example, slaves 50d,. become. Specifically, the master 30a, 30 b, it becomes possible to adopt a communication procedure as shown in FIGS. Here, it is assumed that there are six slaves 50 in total. The three slaves 50a, 50b, 50c are managed by one master 30a, and the remaining three slaves 50d,..., 50n are managed in the default state so that the other master 30b manages them. The master IDs of the masters 30a and 30b to be managed are registered in the wireless controllers of the slaves 50a to 50n.

  When the masters 30a and 30b receiving the connection establishment request command determine that they are connection establishment requests for themselves, the masters 30a and 30b register the added slave ID and send a response frame of the connection establishment response to which the slave ID is added. Send. Thereby, the establishment of the connection between the master 30a and the slaves 50a, 50b, 50c is completed, and the establishment of the connection between the master 30b and the slaves 50d,. Therefore, thereafter, the masters 30a and 30b transmit poll frames at predetermined time intervals to the slaves 50a and the like that are respectively managed.

  That is, as shown in FIG. 6, one master 30a (“Ma” shown in FIG. 6) has three slaves 50a, 50b, and 50c (“Sa”, “Sb” shown in FIG. In response to “Sc”), poll frames are transmitted in order. Similarly, the other master 30b ("Mb" shown in FIG. 6) has three slaves 50d,..., 50n ("Sd", ..., "Sn" shown in FIG. 6) managed by itself. Send poll frames in order. Since a slave ID that can identify the slave 50 is added to the poll frame, each of the slaves 50a, 50b, 50c,..., 50n receives the poll frame for itself, Send ACK.

  The master 30a and the master 30b adjust the transmission timing so that each does not transmit a poll frame at the same time. For example, the masters 30a and 30b can share the transmission clock for determining the transmission timing via the cable 13 to transmit the poll frame with the same (common) transmission clock. As a result, poll frames can be transmitted at different timings, so that polling failure due to collision between both poll frames can be suppressed. In addition, you may avoid such collision of a pole frame by the carrier sense circuit with which each radio | wireless unit of master 30a, 30b is equipped.

  Also, even if the masters 30a and 30b transmit a poll frame to the slave 50, if the corresponding slave 50 does not respond to it (when ACK is not returned), the masters 30a and 30b send alert information of the corresponding slave 50. Information transmitted to the CPU 20 is transmitted to the CPU 20 indicating that the slave 50 is abnormal. Thereby, for example, the CPU 20 displays the failure information of the corresponding slave 50 on the display device (for example, changes the icon of the corresponding slave 50 from green at normal time to red at abnormal time), and notifies the operator of the corresponding slave 50. Notify the failure.

  When the other master 30b cannot transmit the poll frame due to a failure or the like, the slaves 50d,..., 50n to be managed by the master 30b are, for example, in the following procedure, Transition to management. That is, as shown in FIG. 7, there is no polling even when the timing at which a poll frame should be transmitted from the other master 30b (or the timing of a predetermined timeout period since the last reception of the poll frame) has passed. In this case, the slaves 50d,..., 50n transmit a request command frame (REQ) for requesting connection establishment to the other master 30a.

  In addition to the slave ID of the slave 50, the master ID of the master 30a is added to the request command. Therefore, when the master 30a that has received the connection establishment request command determines that it is a connection establishment request for itself, the master 30a registers the added slave ID, and also adds a response frame (a connection establishment response to which the slave ID is added). RES). Thereby, establishment of the connection between the master 30a and the slaves 50d,..., 50n is completed.

  After the connection is established, one master 30a can transmit all the poll frames (POL) to the slaves 50a to 50n in order to manage all the slaves 50 and the like. That is, all the slaves 50 and the like are under the management of the master 30a. When one master 30a cannot transmit a poll frame due to a failure or the like, the slaves 50a, 50b, and 50c to be managed by the master 30a are managed by the other master 30b in the same procedure. Migrate to

As described above, according to the measurement system 10c according to the second embodiment, one master 30a of the two masters 30a and 30b has six nodes 40a, 40b, 40c, 40d,. Sensor data is received from three nodes 40a, 40b, and 40c, and the other master 30b receives sensor data from the remaining three nodes 40d,. Thereby, it is possible to reduce the information processing load of the master 30 per unit as compared with the case where one master 30 receives sensor data from six nodes 40a, 40b, 40c, 40d,. become. That is, load distribution can be performed as compared with the case where the master 30 is single.

Further, when one of the master 30b will not perform the polling process, three nodes 40d that this one master 30b was sending the sensor data, ..., 40n, the other master 30a capable of performing normal polling process, etc. Send sensor data to. When the other master 30a does not perform the polling process, the three nodes 40a, 40b, and 40c that have transmitted the sensor data to the other master 30a can perform the polling process or the like normally. Send sensor data to. Thereby, the six nodes 40a, 40b, 40c, 40d,..., 40n transmit sensor data to one master 30a (or the other master 30b) that cannot respond due to, for example, a failure or the like. It is possible to suppress troubles in transmission of sensor data due to continuing.

  In the measurement system 10c described above, the CPU 20 and the masters 30a and 30b are configured separately and connected by the cable 13, but the CPU 20 and the masters 30a and 30b may be configured integrally. That is, as shown in FIG. 8, another CPU 20 may be added, and one CPU 20a and the master 30a may be configured integrally, and the other CPU 20b and the master 30b may be configured integrally. In this case, the CPU 20a and the CPU 20b are connected by the cable 13 so that the consistency of the management information of the slave 50 between the CPUs 20a and 20b can be ensured. That is, the management information of each slave 50 (slave 50a, 50b, 50c, 50d,..., 50n) is stored in the CPU 20a so that the slave 50a managed by the master 30a and the slave 50d managed by the master 30b do not overlap each other. , 20b.

  Thereby, it is possible to reduce the information processing load of the CPU 20 per unit as compared with the case where sensor data is processed from six nodes 40a, 40b, 40c, 40d,. Become. That is, load distribution can be performed as compared with the case where the CPU 20 is single. Note that the number of CPUs 20 may be three or more.

  Further, the measurement system 10c of the second embodiment and the measurement system 10d shown in FIG. 8 can also be applied to, for example, the liquid level sensor 107 mounted on the tanker 100, similarly to the measurement system 10a.

  In the first embodiment and the second embodiment described above, the case of several nodes 40 and sensor units 60 has been illustrated and described for convenience of explanation. However, more than 100 nodes 40 and sensor units 60 are You may connect to the master 30 etc. via a wireless line.

  In the first embodiment and the second embodiment described above, a polling method is used as a communication procedure between the master 30 and the slave 50. Accordingly, for example, it is possible to prevent collision of sensor data between the slaves 50 (for example, the slave 50a and the slave 50b) as compared with the case where the contention method is used. When the contention method is used as the number of nodes 40 or sensor units 60 increases, the probability that sensor data collide with each other increases. Therefore, by using the polling method, loss of sensor data due to a collision can be prevented and the reliability of the sensor data can be improved. In addition, the polling method does not require an accurate time slot unlike the TDMA (Time Division Multiple Access) method, and therefore, it is not necessary to adopt a synchronization procedure that tends to be complicated. Therefore, for example, when 100 or more nodes 40 or sensor units 60 are connected to the master 30 or the like via a wireless line, sensor data can be obtained by using a polling method, which is an asynchronous and simple procedure. Can maintain a certain quality.

  Further, in the first embodiment and the second embodiment described above, the case where the liquid level sensor 107 mounted on the tanker 100 is exemplified as the sensor units 60 and 60a to 60n, but the measurement system of the present invention is described. , Predetermined physical quantities (position, distance, displacement, mass, substance (gas / liquid / solid) component and concentration, voltage, current, power, temperature, humidity, pressure, flow rate, light (flux, luminous intensity, illuminance, brightness) ), Magnetism, sound, vibration frequency, velocity, acceleration, angular velocity, etc.) may be used.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications or changes of the specific examples described above. In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technique illustrated in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of these objects. Note that the description in parentheses in the [Explanation of Symbols] can clearly indicate the correspondence between the terms used in the above-described embodiments and the terms described in the claims.

10a, 10b, 10c, 10d ... measurement system 11 ... system support panel (housing)
13, 80, 90 ... cable 20 ... CPU (second control unit, one second control unit, some second control units, one second control unit, another second control unit, remaining second control) Unit, the other second control unit)
20a ... CPU (one second control unit, some second control units, one second control unit)
20b ... CPU (other second control unit, remaining second control unit, other second control unit)
30 ... Master (second control unit)
30a ... Master (one second control unit, some second control units, one second control unit)
30b ... Master (other second control unit, remaining second control unit, other second control unit)
40, 40a, 40b, 40c, 40d, 40n... Node (first control unit)
50, 50a, 50b, 50c, 50d, 50n ... Slave (first control unit)
60, 60a, 60b, 60c, 60d, 60n ... sensor unit (sensor)
100 ... Tanker (ship)
105 ... Cargo tank (tank)
107 ... Liquid level sensor (sensor)
110 ... Liquid

Claims (4)

A plurality of first control units respectively connected to a plurality of sensors so as to allow data communication;
A plurality of second sensors which are connected to the plurality of first control units so as to be capable of data communication and receive individual sensor data transmitted from the plurality of sensors or sensor information based on these sensor data from the plurality of first control units. A control unit;
A housing for housing the plurality of first control units and the plurality of second control units;
With
Data communication between the plurality of first control unit the second control unit, the wireless data communication takes place in the housing (communication procedure polling method) Ri der,
When one second control unit of the plurality of second control units does not perform the polling process of the polling method, the sensor data or the second control unit of the plurality of first control units The first control unit that has transmitted the sensor information transmits the sensor data or the sensor information to another second control unit of the plurality of second control units . A plurality of first control units respectively connected to a plurality of sensors so as to allow data communication;
A plurality of second sensors which are connected to the plurality of first control units so as to be capable of data communication and receive individual sensor data transmitted from the plurality of sensors or sensor information based on these sensor data from the plurality of first control units. A control unit;
A housing for housing the plurality of first control units and the plurality of second control units;
With
Data communication between the plurality of first control units and the second control unit is wireless data communication (communication procedure is a polling method) performed in the housing,
Some second control units of the plurality of second control units receive the sensor data or the sensor information from some first control units of the plurality of first control units. the second control unit of the remainder of the second control unit of the the first control unit of the balance sensor data or the you and receives the sensor information meter of the plurality of first control unit Measuring system. A plurality of first control units respectively connected to a plurality of sensors so as to allow data communication;
The two first control units are connected to the plurality of first control units so as to be capable of data communication, and receive the individual sensor data sent by the plurality of sensors or sensor information based on these sensor data from the plurality of first control units. Two control units;
A housing for housing the plurality of first control units and the two second control units;
With
Data communication between the plurality of first control units and the two second control units is wireless data communication (communication procedure is a polling method) performed in the housing.
The one of the second control unit of the two second control unit receives the sensor data and the sensor information from a portion of the first control unit of the plurality of first control unit, the 2 The other second control unit of the second control units of the base receives the sensor data or the sensor information from the remaining first control unit of the plurality of first control units,
When the one second control unit does not perform the polling process of the polling method , the some first control units transmit the sensor data or the sensor information to the other second control unit,
When the other second control unit does not perform the polling process of the polling method , the remaining first control unit transmits the sensor data or the sensor information to the one second control unit. total measurement system that. Wherein the plurality of sensors, measurement system according to any one of claims 1 to 3, characterized in that a liquid level sensor for detecting a liquid surface position of the liquid stored in the tank of a ship.

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