JP5046571B2 - Measuring system - Google Patents

Description

  The present invention relates to a measurement system configured by connecting a plurality of measurement modules that output measurement data obtained by measuring parameters of a measurement object via a communication line.

In a system in which a plurality of modules are connected via a communication line, when each module transmits data simultaneously, data collision may occur on the communication line and communication may become difficult. For this reason, this type of system is generally provided with means for preventing the occurrence of data collision. A communication control system disclosed in Japanese Patent Laid-Open No. 2000-196701 is known as a system including this type of means. The communication control system includes a plurality of communication terminals that are connected to a communication line (communication medium) and communicate data with each other via the communication line. In this case, each communication terminal transmits communication means for transmitting and receiving data via a communication line, pseudo-random data generation means for generating pseudo-random data, communication control means for controlling the communication means, and carriers on the communication line. And carrier detection means for detecting. In this communication control system, when the carrier detection unit confirms that no carrier exists on the communication line, the communication control unit waits for data transmission for a random waiting time specified by the pseudo-random data. Control the communication means. Therefore, in this communication control system, unlike the configuration in which the waiting time for data transmission is uniquely fixed for each communication terminal, each communication terminal has an equal probability while preventing the occurrence of data collision. Data transmission is possible.
JP 2000-196701 A (page 4-7, FIG. 1)

  However, the conventional communication control system has the following problems. That is, in this communication control system, occurrence of data collision on the communication line is prevented by randomly defining a waiting time for the communication means to wait for data transmission. However, in order to obtain a random waiting time, complicated arithmetic processing is required. For example, in a system in which each communication terminal repeats data transmission in a short cycle, the burden of processing by the communication control means increases. Therefore, there is a risk that reliable transmission of data may be difficult. In addition, when a single task CPU functions as the communication control means described above and the CPU also performs other processes, it is difficult to execute other processes other than the communication process during standby. There is also a problem that the overall processing efficiency is lowered.

  The present invention has been made in view of such problems, and it is a main object of the present invention to provide a measurement system capable of reliably transmitting data and improving processing efficiency even in a situation where data transmission is repeated in a short cycle. Objective.

In order to achieve the above object, the measurement system according to claim 1, a measurement unit that measures a parameter of a measurement object and generates measurement data, a data transmission unit that transmits the measurement data via a communication line, A measurement system having a plurality of measurement modules having a control unit for controlling the data transmission unit is connectable to the communication line, and each measurement module is configured by being given a different identification number. , wherein each controller of each measurement module, via the communication line by communicating with other of the measurement module identifies the first number indicating the number of the measurement module connected to the communication line a first calculation result calculated based on the second number indicating the first numerical value and current time the specified, based on the first numerical value and the identification number Wherein to transmit the measured data to the data transmission unit when the second operation result of calculation is matched. In this case, the communication line in the present invention includes both a wired communication line and a wireless communication line.

  Further, in the measurement system according to claim 2, in the measurement system according to claim 1, the control unit obtains the numerical value indicating the second at the current time as the second numerical value by dividing by the first numerical value. When the first remainder value as the first computation result matches the second remainder value as the second computation result obtained by dividing the identification number by the first numerical value, the data transmission unit The measurement data is transmitted.

  According to the measurement system of the first aspect, the control unit calculates the first calculation result calculated based on the first numerical value indicating the number of measurement modules and the second numerical value indicating the current time, and the first numerical value and the identification number. Compared with a conventional system that requires a complicated calculation to obtain a random waiting time by transmitting measurement data to the data transmitter / receiver when the second calculation result calculated based on The burden on the control unit can be sufficiently reduced. For this reason, measurement data can be reliably transmitted even in a situation where transmission of measurement data is repeated in a short cycle. In addition, since the control unit can execute other processes when the control for the data transmission unit is not executed, the measurement system as a whole can be compared with a conventional system that is difficult to execute other processes in the standby state. Processing efficiency can be sufficiently improved.

  According to the measurement system of claim 2, the control unit obtains the first remainder value as the first calculation result obtained by dividing the numerical value indicating the second at the current time by the first numerical value, and the identification number. An operation for obtaining both operation results (both residue values) by causing the data transmitter / receiver to transmit measurement data when the second residue value as a second operation result obtained by dividing by one residue value matches. Since the formula is simple, the process of transmitting measurement data can be executed in a short time.

  Hereinafter, the best mode of a measurement system according to the present invention will be described with reference to the accompanying drawings.

  First, the configuration of the measurement system 1 will be described with reference to the drawings. A measurement system 1 shown in FIGS. 1 and 2 is an example of a measurement system according to the present invention, and is configured to be able to measure parameters of a measurement target device 100 (measurement target body in the present invention). In this case, as the measurement target device 100, for example, a power supply device, a ventilation device, or the like corresponds, and an output voltage in the power supply device, a current flowing through a drive motor in the ventilation device, or the like corresponds to a parameter to be measured.

  As shown in FIGS. 1 and 2, the measurement system 1 includes a plurality of (for example, three) measurement modules 11 a to 11 c (hereinafter also referred to as “measurement module 11” when not distinguished), a communication module 12, and a power supply module 13. And a module bus 14. The measurement module 11 is configured to be attachable / detachable to / from the slot of the module bus 14. In addition, when the measurement module 11 is mounted on the module bus 14, a connector (not shown) disposed on the back surface and a connector 41 (see FIG. 1) of the module bus 14 are connected to each other via the module bus 14. Are connected to the communication module 12 and the power supply module 13.

  As shown in FIG. 3, the measurement module 11 includes a measurement unit 21, a control unit 22, a data memory 23, a clock 24, a data transmission / reception unit 25, and a ROM 26. The measurement unit 21 includes, for example, an A / D conversion circuit, samples a parameter (for example, current) about the measurement target device 100 at a predetermined cycle, and outputs measurement data Dm. The control unit 22 stores the measurement data Dm output from the measurement unit 21 in the data memory 23. Moreover, the control part 22 controls transmission / reception of the measurement data Dm etc. by the data transmission / reception part 25 by performing the data transmission process 50 mentioned later.

  The data memory 23 stores measurement data Dm according to the control of the control unit 22. The clock 24 outputs time data Dt indicating time (current time) t. In this case, each clock 24 in each measurement module 11 and a clock 31 of the communication module 12 described later are configured to be synchronized with each other. The data transmitter / receiver 25 corresponds to the data transmitter in the present invention, and transmits the measurement data Dm stored in the data memory 23 to the communication module 12 via the module bus 14 under the control of the controller 22. The data transmitter / receiver 25 transmits / receives time data Dt to / from the communication module 12 via the module bus 14. The ROM 26 stores identification number data Di indicating the identification number Ni assigned to each measurement module 11. In this case, in this measurement system 1, different integers (continuous integers as an example) are used as the identification numbers Ni given to the respective measurement modules 11.

  The communication module 12 transmits / receives various data including measurement data Dm to / from devices such as a personal computer via a LAN or a public line network. Further, the communication module 12 includes a clock 31 that can be synchronized with the clock 24 of each measurement module 11. The communication module 12 is configured to be mountable in a slot of the module bus 14. In this case, when the communication module 12 is mounted on the module bus 14, a connector (not shown) disposed on the rear surface and a connector 41 (see FIG. 1) of the module bus 14 are connected to each other. Measurement data Dm transmitted from the measurement module 11 is input.

  For example, the power supply module 13 is connected to a commercial AC power supply and supplies power to the measurement module 11 and the communication module 12 mounted on the module bus 14 via the module bus 14. The module bus 14 corresponds to a communication line in the present invention, and includes a plurality of slots for mounting the modules 11 to 13 and a plurality of connectors 41 (not shown) connected to connectors (not shown) of the modules 11 to 13. 1 (only one is shown in the figure) and a bus line (not shown) for connecting the connectors 41 to each other.

  Next, the operation of the measurement system 1 will be described with reference to the drawings. It is assumed that each measurement module 11a to 11c of the measurement system 1 is assigned an identification number Ni composed of continuous integers (for example, “1”, “2”, and “3”).

  In this measurement system 1, each measurement module 11 performs a measurement process. Specifically, the measurement unit 21 of the measurement module 11 samples the parameters of the measurement target device 100 at a predetermined period and outputs measurement data Dm according to the control of the control unit 22. Further, the control unit 22 of the measurement module 11 stores the measurement data Dm output from the measurement unit 21 in the data memory 23. Further, the control unit 22 controls the clock 24 and the data transmission / reception unit 25 to transmit / receive the time data Dt to / from the communication module 12 at predetermined time intervals, for example, the clock 31 of the communication module 12 is a reference clock. The clock 24 is synchronized with the clock 31. By this process, the clock 24 of each measurement module 11 and the clock 31 of the communication module 12 are maintained in a synchronized state.

  On the other hand, the control unit 22 acquires the time t based on the time data Dt output from the clock 24, and executes the data transmission processing 50 shown in FIG. 4 at predetermined time intervals based on the acquired time t. In this case, the interval at which the data transmission process 50 is executed is defined as a time (for example, about 1 second) slightly longer than the time required for the data transmitting / receiving unit 25 to transmit the measurement data Dm (for example, about 0.7 second). Has been. In the data transmission process 50, the control unit 22 reads the identification number data Di from the ROM 26, and specifies the identification number Ni of the measurement module 11 based on the identification number data Di (step 51). Next, the control unit 22 identifies the number of measurement modules 11 (measurement module number) connected to the module bus 14 by communicating with the other measurement modules 11 via the data transmission / reception unit 25 and the module bus 14. (Step 52).

  Subsequently, the control unit 22 divides the numerical value Ns indicating the second at the time t by the numerical value Nm indicating the number of measurement modules (the first numerical value in the present invention: “3” in this example), and then obtains the remainder value S1 (the present invention). (Corresponding to the first calculation result and the first remainder value) in (step 53). In this case, the numerical value Ns corresponds to the second numerical value in the present invention. For example, when the time t is 10:35:11 (hereinafter, this time t is also referred to as “time t1”), It means a value (that is, “11”) corresponding to the portion of “11 seconds” shown. Therefore, in this example, the control unit 22 calculates “2” as the remainder value S1 by the above division (11 ÷ 3).

  Next, the control unit 22 calculates the remainder value S2 (corresponding to the second calculation result and the second remainder value in the present invention) by dividing the identification number Ni by the numerical value Nm (“3”) (step 54). In this case, in this example, since “1”, “2”, and “3” as identification numbers Ni are assigned to the measurement modules 11a to 11c, the control unit 22 of each measurement module 11a to 11c Then, “1”, “2”, and “0” as the remainder value S1 are respectively calculated by the above division (1 ÷ 3, 2 ÷ 3, and 3 ÷ 3).

  Subsequently, the control unit 22 determines whether or not the remainder value S1 and the remainder value S2 match (step 55). In this case, since the remainder value S1 is “2”, the control unit 22 of the measurement modules 11a and 11c determines that the two remainder values S1 and S2 do not match, and ends the data transmission process 50. Further, the control unit 22 of the measurement module 11b controls the data transmission / reception unit 25 to transmit the measurement data Dm (step 56) and ends the data transmission process 50 because the remainder values S1 and S2 match. .

  Next, the control unit 22 performs data at the time when one second has elapsed from the time t1 (10:35:11) (10:35:12: hereinafter, this time t is also referred to as “time t2”). The transmission process 50 is executed. In this case, in step 53, the control unit 22 divides “12” as the numerical value Ns by “3” to calculate “0” as the remainder value S1. Next, the control unit 22 executes Step 55. In this case, since the remainder value S1 is “0”, the control unit 22 of the measurement modules 11a and 11b determines that the two remainder values S1 and S2 do not match, and ends the data transmission process 50. Further, the control unit 22 of the measurement module 11c controls the data transmission / reception unit 25 to transmit the measurement data Dm (step 56) and ends the data transmission processing 50 because the remainder values S1 and S2 match. .

  Next, the control unit 22 determines the time when one second has elapsed from the time t2 (10:35:12) (time of 10:35:13: hereinafter, this time t is also referred to as “time t3”). The data transmission process 50 is executed in FIG. In this case, in step 53, the control unit 22 calculates “1” as the remainder value S1 by dividing “13” as the numerical value Ns by “3”. Next, the control unit 22 executes Step 55. In this case, since the remainder value S1 is “1”, the control unit 22 of the measurement modules 11b and 11c determines that both the remainder values S1 and S2 do not match, and ends the data transmission process 50. Further, the control unit 22 of the measurement module 11a controls the data transmission / reception unit 25 to transmit the measurement data Dm (step 56), and ends the data transmission process 50, because both the residue values S1 and S2 match. .

  Thereafter, the control unit 22 executes the data transmission process 50 at intervals of 1 second. In this case, as described above, when the residual values S1 and S2 match, the control unit 22 outputs the measurement data Dm, so that the measurement data Dm is 3 from each measurement module 11 as shown in FIG. The measurement data Dm transmitted from each measurement module 11 is transmitted to the communication module 12 via the module bus 14 at intervals of 1 second. The transmission of the measurement data Dm from the measurement module 11 is completed in about 0.7 seconds. Therefore, it is possible to reliably prevent the measurement data Dm transmitted from the measurement modules 11a to 11c from colliding with each other on the module bus 14.

  In this case, in the measurement system 1, the timing of transmitting the measurement data Dm is controlled based on the remainder values S1 and S2 calculated by a simple calculation process using the identification number Ni, the numerical value Nm, and the time t. For this reason, the processing load of the control part 22 required for the output of the measurement data Dm is reduced by the amount that the arithmetic processing is simple. Therefore, even in a situation where transmission of the measurement data Dm is repeated in a short cycle, the data transmission process 50 is reliably executed, and the measurement data Dm is reliably transmitted.

  On the other hand, the control unit 22 controls the output of the measurement data Dm by the measurement unit 21 when the data transmission process 50 is not executed (from the end of the data transmission process 50 to the start of the next data transmission process 50). Each process such as a process to store the measurement data Dm in the data memory 23 is executed. For this reason, as compared with the conventional system in which execution of other processing is difficult due to continuing execution of processing for calculating the standby time while maintaining the standby state, the control unit 22 and The processing efficiency of the measurement system 1 as a whole is sufficiently improved.

  As described above, according to the measurement system 1, the control unit 22 calculates the remainder value S <b> 1 calculated based on the numerical value Nm indicating the number of the measurement modules 11 and the numerical value Ns indicating the time t, the numerical value Nm, and the measurement module 11. Conventionally, a complicated calculation for obtaining a random waiting time is required by causing the data transmitter / receiver 25 to transmit the measurement data Dm when the second calculation result calculated based on the identification number Ni matches. Compared with this system, the burden on the control unit 22 can be sufficiently reduced. For this reason, the measurement data Dm can be reliably transmitted even in a situation where the transmission of the measurement data Dm is repeated in a short cycle. In addition, since the control unit 22 can execute other processes when the data transmission process 50 is not executed, the measurement system 1 can be compared with a conventional system in which it is difficult to execute other processes in the standby state. The processing efficiency as a whole can be sufficiently improved.

  Further, according to the measurement system 1, the control unit 22 divides the numerical value Ns indicating the second at the time t by the numerical value Nm indicating the number of the measurement modules 11, and the identification number Ni as the numerical value Nm. When the remainder value S2 obtained by division by the number coincides with the remainder value S2, the data transmission / reception unit 25 is caused to transmit the measurement data Dm, whereby both remainder values S1, S1 necessary for determining the timing for transmitting the measurement data Dm are determined. Since the arithmetic expression for obtaining S2 is simple, the data transmission process 50 can be executed in a short time.

  In addition, this invention is not limited to said structure. For example, although an example in which three measurement modules 11 are provided has been described above, the number of measurement modules 11 is not limited to this and can be arbitrarily defined. In this case, the control unit 22 of the measurement module 11 calculates the remainder value S1 based on the numerical value Nm corresponding to the number of the measurement modules 11 in the data transmission process 50, thereby obtaining the same effect as that of the measurement system 1 described above. Can be realized.

1 is a configuration diagram showing a configuration of a measurement system 1. FIG. 1 is a block diagram illustrating a configuration of a measurement system 1. FIG. 2 is a block diagram showing a configuration of a measurement module 11. FIG. 5 is a flowchart of data transmission processing 50. It is explanatory drawing for demonstrating the output timing of measurement data Dm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measurement system 11, 11a-11c Measurement module 21 Measurement part 22 Control part 14 Module bus 24 Clock 25 Data transmission / reception part 100 Measurement object apparatus Dm Measurement data Ni Identification number Nm Numerical value Ns Numerical value S1, S2 Surplus value

Claims (2)

A plurality of measurement units each including a measurement unit that measures parameters of a measurement object and generates measurement data, a data transmission unit that transmits the measurement data via a communication line, and a control unit that controls the data transmission unit A measurement system configured such that a module is connectable to the communication line,
Each of the measurement modules is configured with different identification numbers from each other,
The control units of the measurement modules identify a first numerical value indicating the number of the measurement modules connected to the communication line by communicating with the other measurement modules via the communication line, When the first calculation result calculated based on the specified first numerical value and the second numerical value indicating the current time matches the second calculation result calculated based on the first numerical value and the identification number, the data A measurement system that transmits the measurement data to a transmission unit. The control unit obtains a first remainder value as the first calculation result obtained by dividing a numerical value indicating the second at the current time as the second numerical value by the first numerical value, and the identification number as the first numerical value. The measurement system according to claim 1, wherein the measurement data is transmitted to the data transmission unit when the second remainder value as the second calculation result obtained by dividing by a numerical value matches .

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