JP2015064654A - Measurement system and measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce time from activation to initial output for a measurement result in a measurement system.SOLUTION: The measurement system comprises: a measurement processing unit for repeating processing for acquiring a sensor value and converting the value into a measurement value; and a calculation processing unit for repeating processing for acquiring a measurement value for a predetermined period to perform calculation. The measurement processing unit includes acquisition information generation means for generating acquisition information showing whether a sensor value is acquired after activation. The calculation processing unit acquires the acquisition information together with a measurement value from the measurement processing unit. When the acquisition information shows the fact that a sensor value is not acquired, the calculation processing unit does not perform calculation.

Description

  The present invention relates to a measurement system including a measurement processing unit that acquires a sensor value and converts it into a measurement value, and an arithmetic processing unit that performs an operation using the measurement value, and a measurement method in such a measurement system.

  Various field devices are used in plants and the like, and representative field devices include measurement systems that measure and output physical quantities such as temperature, pressure, and flow rate.

  In a measurement system, calculation is often performed based on a sensor value acquired from a sensor, and the calculation result is output as a measurement result. In general, a series of these processes are performed by a single processing device. In recent years, modules have been modularized for each function in order to share the equipment. In the measurement system, the acquisition processing unit for acquiring the sensor value and the arithmetic processing unit for performing the calculation are modularized. By proceeding, it is expected that each module will be generalized and the degree of freedom of combination will be improved.

  FIG. 13 is a block diagram illustrating a configuration example of a measurement system assumed when modularization is performed. As shown in the figure, the measurement system 300 includes a measurement processing unit 310, a sensor 320, and an arithmetic processing unit 330. The measurement processing unit 310 and the arithmetic processing unit 330 are configured by a microcontroller having a CPU, a memory, an input / output circuit, and the like, and the sensor 320 uses a device corresponding to the measurement target. For example, if the measurement object is temperature, a thermocouple, a resistance temperature detector, or the like is used. The measurement processing unit 310 and the arithmetic processing unit 330 are configured independently, and exchange information using a communication protocol such as Modbus.

  The measurement processing unit 310 acquires a sensor value using the sensor 320, performs data conversion processing such as digital conversion, and stores it as a measurement value in an internal memory. The arithmetic processing unit 330 acquires measurement values from the measurement processing unit 310, performs calculations such as conversion to physical quantities to be output, correction, unit conversion, and alarm determination, and displays the obtained values and alarm information as measurement results. Output to the device or host device.

  The sensor value acquisition timing of the measurement processing unit 310 and the measurement value acquisition timing of the arithmetic processing unit 330 are asynchronous, and data acquisition is performed in independent cycles.

  When the arithmetic processing unit 330 acquires a measurement value from the measurement processing unit 310, a measurement value request is sent to the measurement processing unit 310, and a measurement value is received from the measurement processing unit 310 as a reply. This is because it is necessary for the arithmetic processing unit 330 to acquire measurement values independently in time for the output rate of the measurement result required in the specification, and the arithmetic processing unit 330 operates as a master from the request of the communication protocol. This is because the measurement processing unit 310 is operated as a slave.

  FIG. 14 is a timing chart for explaining the sensor value acquisition timing of the measurement processing unit 310 and the measurement value acquisition timing of the arithmetic processing unit 330 at the time of activation. When the power supply of the measurement system 300 is turned on at time t0, the measurement processing unit 310 and the arithmetic processing unit 330 each start activation processing.

  Although the startup processing of the arithmetic processing unit 330 is completed at time t1, the measurement processing unit 310 needs to perform warm-up related to the sensor, and thus it takes a long time for the startup processing.

  When the activation processing of the measurement processing unit 310 is completed at time t2, the measurement processing unit 310 starts measurement, and acquires the first sensor value at time t3. The arithmetic processing unit 330 sends a measurement value request to the measurement processing unit 310 at time t4 when it is assumed that the first sensor value acquisition is completed, and acquires the measurement value as a reply.

  Thereafter, the process in which the measurement processing unit 310 acquires sensor values at predetermined intervals and the processing in which the arithmetic processing unit 330 sends a measurement value request to the measurement processing unit 310 at predetermined intervals to acquire measurement values are repeated.

JP 2013-160505 A

  The arithmetic processing unit 330 makes a first measurement value after a predetermined waiting time has elapsed since the start or completion of the start-up process in order to make a first measurement value request after the measurement processing unit 310 has acquired the first sensor value. I make a request. At this time, since it is necessary for the measurement processing unit 310 to reliably acquire the first sensor value, a sufficient margin corresponding to a delay in warm-up completion or the like must be set. From this time, the time until the first measurement result is output becomes longer.

  If the time from start-up to the first measurement result output can be shortened, the waiting time of the user will be shortened and the usability will be improved. it can.

  Therefore, the present invention provides a measurement system including a measurement processing unit that acquires a sensor value and converts it into a measurement value, and an arithmetic processing unit that acquires the measurement value and performs an operation, from the start to the first measurement result output. The purpose is to shorten the time.

In order to solve the above-described problem, a measurement system according to a first aspect of the present invention includes a measurement processing unit that repeats processing for acquiring a sensor value and converting it to a measurement value, and acquiring the measurement value in a predetermined period. A measurement system including a calculation processing unit that repeats a process for performing calculation, the measurement processing unit including acquisition information generation means for generating acquisition information indicating whether the sensor value has been acquired after activation, The calculation processing unit acquires the acquisition information together with the measurement value from the measurement processing unit, and does not perform the calculation when the acquisition information indicates that a sensor value is not acquired. To do.
Here, when the acquired information indicates that the sensor value is not acquired, the arithmetic processing unit desirably makes a repetition period for acquiring the measurement value and the acquired information shorter than the predetermined period.
Further, the acquisition information generation means is a counter that counts the number of times the sensor value is acquired, and the acquisition information is a count value of the counter, indicating that the acquisition information does not acquire a sensor value. The case may be that the count value is an initial value.
Further, the calculation processing unit may not perform the calculation when the count value acquired this time has not changed from the previous acquisition time even when the count value is not an initial value. .
The arithmetic processing unit may output a warning when a state in which the count value acquired this time has not changed since the previous acquisition has continued for a predetermined period or a predetermined number of times.
Further, the arithmetic processing unit may output a warning when the count value acquired this time has changed by two or more from the previous acquisition time.
In order to solve the above-described problem, a measurement system according to a second aspect of the present invention includes a measurement processing unit that repeats a process of acquiring a plurality of sensor values and converting each of the sensor values to a measurement value, and the plurality of measurement values. A measurement system including an arithmetic processing unit that repeats a process of acquiring and calculating in a predetermined period, wherein the measurement processing unit generates acquisition information indicating whether or not the sensor value has been acquired after activation An acquisition information generation unit is provided for each sensor value, and the calculation processing unit acquires the acquisition information together with the measurement value from the measurement processing unit for each measurement value, and any of the acquisition information acquires a sensor value. When it is indicated that there is no data, the calculation is not performed.
In order to solve the above-described problem, a measurement method according to a third aspect of the present invention includes a measurement processing unit that repeats a process of acquiring a sensor value and converting it to a measurement value, and acquiring the measurement value in a predetermined period. A measurement method in a measurement system including an arithmetic processing unit that repeats processing for performing calculation, wherein the measurement processing unit records acquisition information indicating whether the sensor value has been acquired after activation, and the arithmetic processing When the acquisition unit acquires the acquired information together with the measurement value from the measurement processing unit, and the acquisition information indicates that the sensor value is not acquired, the calculation is not performed.

  According to the present invention, in a measurement system including a measurement processing unit that acquires a sensor value and converts it into a measurement value, and an arithmetic processing unit that acquires a measurement value and performs an operation, from startup to the first measurement result output Can be shortened.

It is a block diagram which shows the structure of the measurement system which concerns on 1st Embodiment of this invention. It is a flowchart explaining the operation | movement in 1st Example of a measurement process part. It is a flowchart explaining the operation | movement in 1st Example of an arithmetic processing part. It is a timing diagram explaining the acquisition timing of the sensor value of the measurement process part at the time of starting in the measurement system of 1st Example, and the acquisition timing of the measurement value of an arithmetic process part. It is a block diagram which shows the structure of the measurement system which concerns on 2nd Embodiment of this invention. It is a flowchart explaining the operation | movement in 2nd Example of an arithmetic processing part. It is a block diagram which shows the structure of the measurement system which concerns on 3rd Embodiment of this invention. It is a flowchart explaining the operation | movement in 3rd Example of an arithmetic processing part. It is a block diagram which shows the structure in case there are multiple sensors. It is a figure explaining the calculation start timing in case there are a plurality of sensors. It is a block diagram which shows the structure in case there are multiple sensor values. It is a block diagram which shows the structure in case a sensor and a measurement process part are plurality. It is a block diagram which shows the structural example of the measurement system at the time of employ | adopting a modular structure. It is a timing diagram explaining the acquisition timing of the sensor value of the measurement processing part at the time of starting, and the acquisition timing of the measurement value of the arithmetic processing part.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a measurement system according to the first embodiment of the present invention.

  As shown in the figure, the measurement system 100 includes a measurement processing unit 110, a sensor 120, and an arithmetic processing unit 130. The measurement processing unit 110 and the arithmetic processing unit 130 are configured by a microcontroller having a CPU, a memory, an input / output circuit, and the like, and the sensor 120 uses a device corresponding to the measurement target. For example, if the measurement object is temperature, a thermocouple, a resistance temperature detector, or the like is used. The measurement processing unit 110 and the arithmetic processing unit 130 are configured independently, and exchange information with a communication protocol such as Modbus. The measurement processing unit 110 and the arithmetic processing unit 130 may be incorporated in the same housing or may be configured as separate devices.

  The measurement processing unit 110 includes a sensor value acquisition unit 111, a counter 112, a conversion unit 113, and a measurement value memory 114.

  The sensor value acquisition unit 111 acquires a sensor value using the sensor 120. The counter 112 counts the number of times the sensor value acquisition unit 111 has acquired a sensor value. The count value is reset to 0 which is an initial value at the time of activation. For this reason, the count value indicates the number of times the sensor value is acquired after activation. The count value may be reset at a predetermined value, a predetermined timing, or the like.

  The conversion unit 113 performs a data conversion process such as digital conversion on the sensor value acquired from the sensor 120 by the sensor value acquisition unit 111 and stores it as a measurement value in the measurement value memory 114.

  The calculation processing unit 330 includes a measurement value / count value acquisition unit 131 and a calculation unit 132.

  The measurement value / count value acquisition unit 131 sends a measurement value / count value acquisition request to the measurement processing unit 110 to acquire the measurement value stored in the measurement value memory 114 and the count value measured by the counter 112.

  The calculation unit 132 performs calculations such as conversion to a physical quantity to be output, correction, unit conversion, alarm determination, and the like for the measurement value acquired by the measurement value / count value acquisition unit 131, and obtains the obtained value and alarm information. The measurement result is output to a display device or a host device. However, regarding the measurement value used for the first calculation after activation, the calculation unit 132 invalidates the measurement value when the count value is 0, and does not perform the calculation.

  The operation of the measurement system 100 having the above configuration will be described. FIG. 2 is a flowchart for explaining the operation of the measurement processing unit 110.

  When the measurement system 100 is powered on, the measurement processing unit 110 performs start-up processing including warm-up (S101).

  When the warm-up is completed (S102: Yes), the sensor value acquisition unit 111 acquires the sensor value from the sensor 120 at every sensor value acquisition timing (S103: Yes) (S104). When the sensor value is acquired, the count value of the counter 112 is increased (S105), and the sensor value is converted into data by the conversion unit 113 and stored in the measurement value memory 114 as a measurement value (S106).

  When the measurement value / count value acquisition request is received from the arithmetic processing unit 330, the measurement value stored in the measurement value memory 114 and the count value of the counter 112 are returned to the arithmetic processing unit 130 (S108).

  Next, the operation of the arithmetic processing unit 130 in the first embodiment will be described with reference to the flowchart of FIG.

  When the measurement system 100 is turned on, the arithmetic processing unit 130 performs activation processing (S201).

  When the activation process is completed, the measurement value / count value acquisition unit 131 sends a measurement value / count value acquisition request to the measurement processing unit 110 at a predetermined initial acquisition request timing (S202: Yes). The first measurement value / count value acquisition request does not need to wait for the reliable completion of the activation process of the measurement processing unit 110, and can be sent at a timing earlier than the first measurement value request after the conventional waiting time.

  When the measurement value and the count value are acquired as a response to the measurement value / count value acquisition request (S204), it is determined whether the acquired count value is 0 (S205). As a result, when the count value is 0 (S205: Yes), it indicates that the sensor value has not yet been acquired by the measurement processing unit 110, so that the acquired measurement value is invalidated and the timing of the next initial acquisition request. (S202). It is desirable that the interval until the next first acquisition request is shorter than the interval between normal measurement value acquisition requests after the calculation is executed with the measurement values valid and measurement results are output. Thereby, it becomes possible to detect the state where the count value becomes 1 earlier.

  On the other hand, when the count value is not 0 (S205: No), to indicate that the sensor value has been acquired by the measurement processing unit 110, the calculation unit 132 performs the first calculation using the acquired measurement value (S206). ). Then, the calculation result is output as the first measurement result (S207). As a result, the time from the start to the first measurement result output can be shortened.

  Thereafter, at the same timing as the conventional measurement value acquisition request interval (S208), a measurement value / count value acquisition request is sent to the measurement processing unit 110 (S209), and the measurement value and the count value are acquired (S210). However, you may make it acquire only a measured value. And the calculating part 132 calculates using the acquired measured value (S211), and outputs a calculation result as a measurement result (S212). Then, the next acquisition request is made at a predetermined timing (S208).

  In the first embodiment, a flag indicating whether or not a sensor value has been acquired may be used instead of the counter 112. Assuming that the sensor value is not acquired by 0 and the sensor value is acquired by 1, the arithmetic processing unit 130 invalidates the acquired measurement value if the flag is 0, and the flag is 1. If there is, calculation may be performed using the acquired measurement value.

  FIG. 4 is a timing diagram illustrating the sensor value acquisition timing of the measurement processing unit 110 and the measurement value acquisition timing of the arithmetic processing unit 130 at startup in the measurement system 100 of the first embodiment.

  When the power supply of the measurement system 100 is turned on at time t0, the measurement processing unit 110 and the arithmetic processing unit 130 start activation processes.

  When the activation processing of the arithmetic processing unit 130 is completed at time t1, a measurement value / count value acquisition request is sent to the measurement processing unit 110 at time t2 without securing the conventional waiting time, and the measurement value, count value, To get. Since the count value is 0 at this time, the acquired measurement value becomes invalid.

  When the activation process of the measurement processing unit 110 is completed at time t3, the measurement processing unit 110 starts measurement, and performs the first sensor value acquisition at time t4. As a result, the count value becomes 1.

  When the arithmetic processing unit 130 sends a measurement value / count value request to the measurement processing unit 110 at time t5 and obtains the measurement value and the count value as a response, the count value is 1. Therefore, the obtained measurement value is To perform operations.

  Thereafter, the measurement processing unit 110 acquires sensor values at a predetermined interval, the arithmetic processing unit 130 sends a measurement value / count value acquisition request, and the measurement value and the count value are acquired.

  As described above, according to the measurement system 100 of the first embodiment, the arithmetic processing unit 130 can make a measurement value acquisition request without waiting for a waiting time including a sufficient margin after activation. The time from the time to the first measurement result output can be shortened.

  Next, a second embodiment of the present invention will be described. In the second embodiment, if the count value has increased since the previous calculation, the calculation is performed. That is, after the calculation is started, if the measurement value acquisition timing of the calculation processing unit 130 is too early and the measurement value is not updated, the processing efficiency of the calculation processing unit 130 is improved by not performing the calculation. Improve.

  FIG. 5 is a block diagram showing a configuration of a measurement system according to the second embodiment of the present invention. The same blocks as those in the first embodiment are denoted by the same reference numerals.

  As shown in the figure, the measurement system 100 according to the second embodiment includes a measurement processing unit 110, a sensor 120, and an arithmetic processing unit 130. The measurement processing unit 110 and the sensor 120 are the same as those in the first embodiment. The calculation processing unit 130 includes a count value memory 133 in addition to the measurement value / count value acquisition unit 131 and the calculation unit 132 of the first embodiment. The count value memory 133 is a memory that temporarily stores the count value acquired from the measurement processing unit 110.

  The operation of the measurement system 100 of the second embodiment having the above configuration will be described. The operation of the measurement processing unit 110 is the same as that of the first embodiment. FIG. 6 is a flowchart for explaining the operation of the arithmetic processing unit 130 of the second embodiment.

  When the measurement system 100 is turned on, the arithmetic processing unit 130 performs activation processing (S301).

  When the activation process is completed, the measurement value / count value acquisition unit 131 sends a measurement value / count value acquisition request to the measurement processing unit 110 at a predetermined initial acquisition request timing (S302: Yes) (S303). The first measurement value / count value acquisition request can be sent at a timing earlier than the first measurement value request after the conventional waiting time.

  When the measurement value and the count value are acquired as a response to the measurement value / count value acquisition request (S304), the count value is stored in the count value memory 133 (S305), and it is determined whether the acquired count value is 0 (S306). ).

  As a result, when the count value is 0 (S306: Yes), it indicates that the sensor value has not yet been acquired by the measurement processing unit 110, so that the acquired measurement value is invalidated and the timing of the next initial acquisition request. (S302). The interval until the next first acquisition request is preferably shorter than the interval between normal measurement value acquisition requests. Thereby, it becomes possible to detect the state where the count value becomes 1 earlier.

  On the other hand, when the count value is not 0 (S306: No), to indicate that the sensor value has been acquired by the measurement processing unit 110, the calculation unit 132 performs the first calculation using the acquired measurement value (S307). ). Then, the calculation result is output as the first measurement result (S308). As a result, it is possible to shorten the time from the start point to the first measurement result output.

  Thereafter, at the same timing as the conventional measurement value acquisition request interval (S309), a measurement value / count value acquisition request is sent to the measurement processing unit 110 (S310), and the measurement value and the count value are acquired (S311).

  Then, it is determined whether or not the most recently acquired count value has increased from the value stored in the count value memory 133 (the previously acquired count value) (S312). If the count value has not increased (S312: No), the measurement value / count value acquisition request is sent again to the measurement processing unit 110 to indicate that the measurement value has not been updated since the previous acquisition (S310). ), The measurement value and the count value are acquired (S311). The interval for sending the measurement value / count value acquisition request at this time is preferably shorter than the normal interval after the start of calculation. In the case of using a subtraction counter, it may be determined whether or not the acquired count value is decreased from the value stored in the count value memory 133. The same applies to other examples.

  When the acquired count value is increased from the value stored in the count value memory 133 (S312: Yes), the acquired count value is stored in the count value memory 133 to indicate that the measurement value is updated. While storing (S313), the calculating part 132 calculates using the acquired measured value (S314), and outputs a calculation result as a measurement result (S315). Then, the next acquisition request is made at a predetermined timing (S309).

  Next, a third embodiment of the present invention will be described. In the third embodiment, the measurement processing unit 110 is diagnosed using the count value, and when an abnormality is detected, the arithmetic processing unit 130 outputs alarm information.

  FIG. 7 is a block diagram showing a configuration of a measurement system according to the third embodiment of the present invention. The same reference numerals are assigned to the same blocks as those in the first and second embodiments.

  As shown in the figure, the measurement system 100 according to the third embodiment includes a measurement processing unit 110, a sensor 120, and an arithmetic processing unit 130. The measurement processing unit 110 and the sensor 120 are the same as those in the first embodiment and the second embodiment. The calculation processing unit 130 includes an abnormality determination unit 134 in addition to the measurement value / count value acquisition unit 131, the calculation unit 132, and the count value memory 133 of the second embodiment. The abnormality determination unit 134 determines an abnormality in the measurement processing unit 110 based on the acquired count value, and outputs alarm information to a display device, a host device, or the like when an abnormality is detected.

  The operation of the measurement system 100 of the second embodiment having the above configuration will be described. The operation of the measurement processing unit 110 is the same as in the first and second embodiments. FIG. 8 is a flowchart for explaining the operation of the third embodiment of the arithmetic processing unit 130. The process up to the process of outputting the first measurement result (S308) is the same as the operation of the second embodiment shown in the flowchart of FIG.

  After the output of the first measurement result, the measurement value / count value acquisition request is sent to the measurement processing unit 110 (S402) at the same timing as the interval of the conventional measurement value acquisition request (S401), and the measurement value and the count value are acquired. (S403).

  Then, it is determined whether or not the acquired count value has increased from the value stored in the count value memory 133 (S404). If it has not increased (S404: No), the count value has further increased. The abnormality determination unit 134 determines whether there is no state for a predetermined period or a predetermined number of times (S405).

  If the state where the count value has not increased continues for a predetermined period or a predetermined number of times (S405: Yes), there is a possibility that some abnormality has occurred in the measurement processing unit 110 and the measurement value cannot be updated at a normal cycle. Therefore, the abnormality determination unit 134 outputs an alarm to notify the user that an abnormality has occurred (S408).

  When the state in which the count value has not increased does not continue for a predetermined period or a predetermined number of times (S405: No), a measurement value / count value acquisition request is sent again to the measurement processing unit 110 (S402), and the measurement value and count are counted. A value is acquired (S403). It is desirable that the interval for sending the measurement value / count value acquisition request at this time be shorter than the normal interval.

  When the acquired count value has increased from the value stored in the count value memory 133 (S404: Yes), it is determined whether or not the acquired count value is continuous with the value stored in the count value memory 133. The abnormality determination unit 134 determines (S406).

  If the acquired count value is not continuous with the value stored in the count value memory 133 (S406: Yes), it means that the measured value has been skipped. Assuming that an abnormality or the like has occurred, the abnormality determination unit 134 outputs an alarm to notify the user that an abnormality has occurred (S408). This abnormality determination is particularly effective in measurement in which all measurement values such as maximum value and minimum value measurement should be acquired.

  When the acquired count value is continuous with the value stored in the count value memory 133 (S406: No), the acquired count value is stored in the count value memory to indicate that the measurement value is updated normally. The calculation unit 132 performs calculation using the acquired measurement value (S409) and outputs the calculation result as the measurement result (S410). Then, the next acquisition request is made at a predetermined timing (S401).

  In the first to third embodiments, the case where there is one sensor 120 and one sensor value has been described. However, the present invention may be applied to a case where there are a plurality of sensors or a plurality of sensor values. The present invention can also be applied. FIG. 9 is a block diagram showing a configuration of the measurement system 100 when there are a plurality of sensors. The example of this figure corresponds to the configuration of the first embodiment, but it can also correspond to the configurations of the second and third embodiments.

  As shown in the figure, the measurement system 100 includes three sensors (sensor a 120a, sensor b 120b, sensor c 120c), and the measurement processing unit 110 includes three counters (counter a 112a, counter b 112b, Counter c112c) and three measurement value memories (measurement value memory a114a, measurement value memory b114b, measurement value memory c114c).

  The counter a112a counts the number of sensor value acquisitions from the sensor a120a, the counter b112b counts the number of sensor value acquisitions from the sensor b120b, and the counter c112c counts the number of sensor value acquisitions from the sensor c120c.

  The measurement value memory a114a stores the measurement value a based on the sensor value a acquired from the sensor a120a. The measurement value memory b114b stores the measurement value b based on the sensor value b acquired from the sensor b120b. The memory c114c stores a measurement value c based on the sensor value c acquired from the sensor c120c.

  When the measurement value / count value acquisition unit 131 of the arithmetic processing unit 130 sends a measurement value / count value request to the measurement processing unit 110, the measurement processing unit 110 measures the measurement value a and the counter stored in the measurement value memory a 114a. The count value a of a112a, the measurement value b stored in the measurement value memory b114b, the count value b of the counter b112b, the measurement value c stored in the measurement value memory c114c, and the count value c of the counter c112c are returned.

  The calculation unit 132 of the calculation processing unit 130 performs a calculation using the measurement value a, the measurement value b, and the measurement value c, and outputs a measurement result.

  When the warm-up completion times of the sensors 120 are different, as shown in FIG. 10, the count start timings of the counters 112 are different, but the calculation unit 132 starts the calculation when all the count values are not zero. To. Also in this case, the first measurement value / count value request can be sent without waiting for the reliable warm-up completion of each sensor 120. Also, it is desirable that the interval between acquisition requests before the start of calculation is shorter than the interval between acquisition requests after the start of calculation.

  FIG. 11 is a block diagram showing a configuration when a plurality of sensor values are acquired by one sensor 120. In the example of this figure, the measurement processing unit 110 acquires the sensor value a, the sensor value b, and the sensor value c from the sensor 120. Also in this case, the measurement processing unit 110 includes three counters (counter a112a, counter b112b, counter c112c) corresponding to each sensor value and a measurement value memory (measurement value memory a114a, measurement value memory b114b, measurement value memory c114c). ), It is possible to perform the same processing as when there are a plurality of sensors.

  FIG. 12 is a block diagram illustrating a configuration when a plurality of measurement processing units are provided. In the example of this figure, a measurement processing unit a110a that acquires the sensor value a from the sensor a120a and a measurement processing unit b110b that acquires the sensor value b from the sensor b120b are provided.

  Then, the calculation unit 132 of the calculation processing unit 130 performs calculation using the measurement value a acquired from the measurement processing unit a110a and the measurement value b acquired from the measurement processing unit b110b, and outputs the measurement result. .

  In this case, the arithmetic processing unit 130 simultaneously sends a measurement value / count value request to the measurement processing unit a110a and the measurement processing unit b110b, and acquires the measurement value a and the count value a as a reply from the measurement processing unit a110a. The measurement value b and the count value b are acquired as a reply from the part b110b. Then, the calculation may be started when both the count value a and the count value b are not zero.

DESCRIPTION OF SYMBOLS 100 ... Measurement system 110 ... Measurement processing part 111 ... Sensor value acquisition part 112 ... Counter 113 ... Conversion part 114 ... Measurement value memory 120 ... Sensor 130 ... Calculation processing part 131 ... Measurement value / count value acquisition part 132 ... Calculation part 133 ... Count value memory 134 ... abnormality determination unit

Claims (8)

A measurement system comprising: a measurement processing unit that repeats a process of acquiring a sensor value and converting it to a measurement value; and an arithmetic processing unit that repeats a process of acquiring the measurement value in a predetermined period and performing a calculation,
The measurement processing unit includes acquisition information generation means for generating acquisition information indicating whether the sensor value has been acquired after activation,
The calculation processing unit acquires the acquisition information together with the measurement value from the measurement processing unit, and does not perform the calculation when the acquisition information indicates that a sensor value is not acquired. Measuring system.   The arithmetic processing unit, when the acquired information indicates that a sensor value is not acquired, makes a repetition period for acquiring the measured value and the acquired information shorter than the predetermined period. The measurement system according to 1. The acquisition information generation means is a counter that counts the number of times the sensor value is acquired;
The acquisition information is a count value of the counter,
The measurement system according to claim 1 or 2, wherein the case where the acquisition information indicates that the sensor value is not acquired is that the count value is an initial value.   The calculation processing unit does not perform the calculation if the count value acquired this time has not changed since the previous acquisition, even if the count value is not an initial value. 3. The measurement system according to 3.   5. The measurement according to claim 4, wherein the arithmetic processing unit outputs a warning when a state in which the count value acquired this time has not changed since the previous acquisition has continued for a predetermined period or a predetermined number of times. system.   The measurement according to any one of claims 3 to 5, wherein the arithmetic processing unit outputs a warning when the count value acquired this time has changed by two or more from the previous acquisition time. system. A measurement processing unit that repeats a process of acquiring a plurality of sensor values and converting each of the sensor values into a measurement value, and an arithmetic processing unit that repeats a process of acquiring the plurality of measurement values in a predetermined period and performing a calculation A measuring system,
The measurement processing unit includes, for each sensor value, an acquisition information generation unit that generates acquisition information indicating whether the sensor value has been acquired after activation.
The calculation processing unit acquires the acquisition information together with the measurement value from the measurement processing unit for each measurement value, and when any acquisition information indicates that the sensor value is not acquired, the calculation processing unit performs the calculation. Measurement system characterized by not performing. A measurement method in a measurement system comprising a measurement processing unit that repeats a process of acquiring a sensor value and converting it into a measurement value, and an arithmetic processing unit that repeats a process of acquiring the measurement value in a predetermined period and performing a calculation. And
The measurement processing unit records acquisition information indicating whether the sensor value has been acquired after activation,
The calculation processing unit acquires the acquisition information together with the measurement value from the measurement processing unit, and does not perform the calculation when the acquisition information indicates that a sensor value is not acquired. Measuring method to do.