JP2004334732A - Measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide measuring device which can perform more complicated controls by adding conditional branch to a computation function and by deciding a digital output, analog output, a manipulated signal or the like by using a computation result from the function. <P>SOLUTION: In the measuring device having a measurement part for measuring a predetermined input signal, a computation part for computing by using at least one of measured result and predetermined parameters, and a signal output part for outputting a signal according to the measurement result or a computed result, a conditional branch processing part is provided which designates computation to be executed for the computation part, on the basis of at least one of the measuring result and the parameters; and the signal output part outputs a signal according to the computed result. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a measuring device such as a recorder having a predetermined signal output unit, and more particularly to an improvement in a calculation function for determining an output signal.
[0002]
[Prior art]
A conventional measuring device includes a signal output unit that outputs a predetermined signal based on a measured value or the like.
Some of such measuring devices generate an alarm when a measured value exceeds a certain value, and control the on / off of a relay output of a digital output unit using the alarm generating signal.
[0003]
Further, there is a device that outputs an operation signal for performing PID control on a control target such that the measurement result becomes a set value according to a measurement result input from a control target and a predetermined set value (for example, see Patent Document 1). 1).
Such a measuring device will be described with reference to the drawings.
[0004]
FIG. 5 is a configuration diagram showing an example of a conventional measuring device.
The measurement unit 1 converts a plurality of analog input signals including a measurement signal from a control target (not shown) into a digital signal.
The signal generator 2 generates an operation signal for operating a control target. As such a signal generation unit 2, a signal generation unit constituted by a microprocessor, a D / A converter, a memory, or the like is used.
[0005]
The control unit 50 controls the entire apparatus, and is configured by, for example, a processor. Further, an arithmetic processing unit 51 and an alarm detection unit 52 are provided. The arithmetic processing unit 51 performs various arithmetic processes related to the measurement such as addition, subtraction, multiplication, division, square root, and averaging on the digital signal output from the measurement unit 1. The alarm detection unit 52 detects, for example, a case where the measurement result or the calculation result exceeds a preset value, generates an alarm signal, and controls on / off of a relay of the relay output unit 7.
[0006]
The operation unit 4 includes predetermined parameters such as a program pattern for performing a program operation of the control target, measurement conditions of the measurement unit, calculation conditions of the arithmetic processing unit, signal generation conditions of the signal generation unit, and display conditions of the display unit. Has a function for inputting
The memory 5 stores a program pattern, a digital signal output from the measurement unit 1, and a calculation processing result of the calculation processing unit 51.
The program pattern is a change pattern of a set value with respect to time.
[0007]
The display unit 6 graphically displays information related to a measurement signal of a control target, information of an operation signal related to operation of the control target, and the like, and uses a CRT, an LCD, or the like as a display.
The analog output unit 8 converts the digital value of the measurement result or the calculation result into an analog signal and outputs the analog value to an external device (not shown).
[0008]
FIG. 6 is an explanatory diagram showing a flow of alarm detection and calculation processing of the conventional measuring device.
In FIG. 6A, the measurement channel data, the calculation channel data, the control PV data, the control SV data, and the control MV data (hereinafter, referred to as measurement channel data) are input to the alarm detection unit 31 described above. Is shown.
[0009]
The measurement channel data is analog input digital data measured by the measurement unit 1 described above. The calculation channel data is a calculation result of the calculation processing unit 32 described above.
For the user, the calculation function of the calculation processing unit 32 is recognized as a calculation channel, and the setting of the calculation expression is performed as a setting for the calculation channel.
The control PV data is data obtained by measuring a signal from a control target by the measurement unit 1, the control SV data is a control target set value input from the operation unit 4, and the control MV data is signal generation of the above signal. This is data on which an analog signal output from the unit 2 is based.
[0010]
FIG. 6B shows a state in which measurement channel data and the like are input to the above-described arithmetic processing unit 52, and the data is re-transmitted after the arithmetic processing unit 52 performs an arithmetic operation using these data. is there. Here, the retransmission means that the measurement data and the like are analog-outputted to an external device using the analog output unit 8 described above.
[0011]
[Patent Document 1]
Japanese Patent No. 2624125
[Problems to be solved by the invention]
In such a conventional measuring device, the relay output can only control on / off of the relay by alarm detection.
For this reason, when performing sequential control using the measurement channel data or the like under control, detection of the measurement channel data or the like is treated as occurrence of an alarm, and only the relay ON / OFF output can be realized. Was.
Therefore, it deviates from the meaning of the original alarm.
[0013]
In addition, the calculation result using the measurement channel data and the like is used as a determination condition of an alarm detection and a control condition of a control target, but this calculation is performed as a description of a calculation expression for the calculation channel. That is, it can be realized only through the operation channel, and the types of the operations are only four arithmetic operations, logical operations, square root, and average. Therefore, there has been a problem in that control or alarm generation using a calculation result cannot cope with complicated condition determination.
[0014]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a conditional branch is added to an arithmetic function, and a digital output, an analog output, an operation signal, and the like are determined using the arithmetic result. It is an object of the present invention to provide a measuring device capable of performing various controls.
[0015]
[Means for Solving the Problems]
The present invention is a measuring device having the following configuration.
[0016]
(1) a measuring unit for measuring a predetermined input signal;
An arithmetic processing unit that performs an arithmetic operation using at least one of the measurement result and a predetermined parameter,
A signal output unit that outputs a signal according to the measurement result or the calculation result,
In a measuring device having
Providing a conditional branch processing unit that specifies an operation to be performed on the arithmetic processing unit based on at least one of the measurement result and the parameter,
The signal output unit outputs a signal according to the calculation result.
[0017]
(2) The measurement device according to (1), wherein the signal output unit is a relay output unit that outputs a relay on / off signal.
[0018]
(3) The measurement device according to (1), wherein the signal output unit is a signal generation unit that generates an operation signal for operating a predetermined control target using the measurement result and the parameter.
[0019]
(4) The measurement device according to claim 1, wherein the signal output unit is an analog output unit that converts a digital value of a measurement result or a calculation result into an analog signal and outputs the result.
[0020]
(5) The measuring device according to any one of (1) to (4), wherein the branching process performed by the branching processing unit has a nest structure.
The measuring device according to item 1.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a configuration diagram showing one embodiment of the present invention.
In FIG. 1, the same components as those described above are denoted by the same reference numerals, and the description of the same components will be omitted.
[0022]
FIG. 1 differs from the conventional example in the following points.
A conditional branch processing unit 32 is provided in the arithmetic processing unit 31 of the control unit 3. The conditional branch processing unit 32 determines a branch destination by comparing the measurement channel data or the like input to the arithmetic processing unit 31 with the branch condition input from the operation unit 4. Then, the arithmetic processing of the branch destination is executed.
[0023]
Based on the calculation result, the relay of the relay output unit 7 is turned on / off, an analog signal is output from the analog output unit 8, and an operation signal is output from the signal generation unit 2. Further, the alarm detection may be performed by the alarm detection unit 33 using the calculation result.
Note that the signal generation unit 2, the relay output unit 7, and the analog output unit 8 correspond to a signal output unit in claims.
[0024]
FIG. 2 is an explanatory diagram illustrating the flow of the process of the arithmetic processing unit.
FIG. 2A shows a state in which measurement channel data and the like are input to the arithmetic processing unit 31 as in the conventional example. In the arithmetic processing section 31, conditional branch processing is performed by the above-described conditional branch processing section 32, and any one of the arithmetic expressions 1, 2, and 3 at the branch destination is performed based on the result. In arithmetic expressions 1, 2, and 3, four arithmetic operations, logical operations, and the like are performed, and the operation results are output as a relay output and an analog output.
Thereby, each signal output can correspond to a complicated condition judgment.
[0025]
In FIG. 2B, the measurement unit 1 generates measurement channel data from an output signal to be controlled and performs conditional branch processing on the measurement channel data. , 3 are performed. This calculation result is used as control PV data.
Thereby, control PV data corresponding to complicated condition determination can be used for control.
[0026]
An example of a format used for setting the above-described conditional branch processing is shown below.
[Equation 1? Equation 2: Equation 3]
Here, when the calculation result of the expression 1 is true, the expression 2 is a solution, and when the calculation result is false, the expression 3 is a solution.
[0027]
Each expression part can describe a conventional arithmetic expression and can have a hierarchy. The term “hierarchy” means that a conditional operator has a nested structure, and the term “nested structure” means a state in which conditional branch processing exists in conditional branch processing.
[0028]
In the conditional branch processing unit 32 described above, an operator is interpreted by an expression interpreting unit (not shown), and a token string is set in reverse Polish notation. The reverse Polish notation is a notation on the assumption that calculation is performed by a stack operation. For example, the calculation “B + C × K” is described as “BCK × +”. The stack is a data format of a LIFO (last-in first-out) expression, and the last value remaining on the stack is a solution of the operation expression.
Then, a branching process is performed in accordance with the token sequence set by the reverse Polish notation in an expression executing unit (not shown).
[0029]
FIG. 3 is a flowchart showing the processing steps of the formula interpretation unit.
A description will be given according to the processing steps.
(ST1) The correctness of the description of the arithmetic expression set from the operation unit is checked.
(ST2) It is determined whether or not there is an error after the execution of the process ST1, and if there is no error, the process of the process ST3 is performed, and if there is an error, the process of the process ST5 is performed.
(ST3) The hierarchy information of the operation expression is set in the token string.
(ST4) The expression part is set in the token string in the reverse Polish notation, and the process ends.
(ST5) Perform error processing and end.
[0030]
FIG. 4 is a flowchart showing the processing steps of the expression execution unit.
A description will be given according to the processing steps.
[0031]
(STP1) It is determined whether the conditional operator of the token string is "[".
If "Yes", the process of the token string set between this operator and the next operator is performed, the process of STP2 is performed, and the process of STP2 is performed.
If “No”, the process of STP2 is performed.
[0032]
(STP2) Determine whether the conditional operator is “?”.
If "Yes" and the operation result of STP1 is "True", the process of the token sequence set between this operator and the next operator is performed, and the process of STP3 is performed.
If "Yes" and the operation result of STP1 is "False", the process jumps to the operator ":" of the same hierarchy and performs the processing of STP3.
If “No”, the process of STP3 is performed.
[0033]
(STP3) It is determined whether the conditional operator is ":".
If "yes", the process of the token string set between this conditional operator and the next operator is performed, and the process of STP4 is performed.
If “No”, the process of STP4 is performed.
[0034]
(STP4) It is determined whether the conditional operator is "]".
If "yes", and there is a hierarchy one level higher, the process jumps to the conditional operator "]" of that hierarchy and performs the processing of STP5, and if there is no hierarchy one above, processing of STP5 is performed as it is.
If "No", the process of STP5 is performed.
[0035]
(STP5) It is determined whether the calculation has been performed to the end.
If "yes", save the solution and end the process.
If “No”, the process of STP1 is performed.
[0036]
A specific description example of an arithmetic expression with a conditional branch is shown below. The arithmetic expression is input from the operation unit 4 and displayed on the display unit 6.
DO001 = [SV <= 30? 1: 0]
DO002 = [SV <= 60? [SV <= 30? 0: 1]: 0]
DO003 = [SV> 60? 1: 0]
[0037]
Here, DO001 to DO003 indicate relay numbers of the relay output. The relay DO001 turns on when the solution is true (1) when the SV value is 30% or less, and turns off when the solution is false (0) otherwise. In the relay DO002, the solution is true (1) if the SV value is 60% or less and larger than 30%, and the solution is false (0) otherwise. The relay DO003 turns the solution true (0) if the SV value is greater than 60%, and turns off the solution false (0) otherwise.
[0038]
Focusing on the processing of the relay DO002, conventionally, it is necessary to determine both that the SV value is greater than 30% and that the SV value is equal to or less than 60%, and perform an AND operation on the AND value.
On the other hand, by the branch processing having the nest structure described above, the calculation result of DO002 when the SV value exceeds 60% becomes false (0) without judging the threshold value of 30%.
Thereby, the processing steps can be optimized, and efficient control can be realized.
[0039]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0040]
According to the first aspect of the present invention, the conditional branch processing unit is provided, the branch operation specified by the conditional branch processing unit is performed, and a signal determined from the calculation result is output from the signal generation unit. This makes it possible to cope with a complicated condition judgment when outputting a predetermined signal.
This facilitates the application of the measuring device.
[0041]
According to the second aspect of the present invention, by performing on / off control of the relay of the relay output unit based on the operation result to which the branch processing is added, relay control corresponding to complicated condition determination can be performed. In addition, it is not necessary to use an alarm for detecting an alarm when the apparatus is operated in a sequence.
[0042]
According to the third aspect of the present invention, an operation signal for operating a predetermined control target can be generated using the operation result to which the branch processing is added as control PV data, so that it is possible to cope with complicated condition determination. Control becomes possible.
[0043]
According to the fourth aspect of the present invention, the analog output can be performed based on the operation result to which the branch processing is added, so that the retransmission corresponding to the complicated condition determination can be performed.
[0044]
According to the fifth aspect of the present invention, since the branch processing has a nested structure, more complicated condition determination can be performed, and the processing steps can be optimized, and efficient control can be realized.
[0045]
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing one embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a processing flow of an arithmetic processing unit.
FIG. 3 is a flowchart showing processing steps of an expression interpreting unit.
FIG. 4 is a flowchart showing processing steps of an expression execution unit.
FIG. 5 is a configuration diagram showing an example of a conventional measurement device.
FIG. 6 is an explanatory diagram showing a flow of alarm detection and calculation processing of a conventional measuring device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 measurement unit 2 signal generation unit 3 control unit 4 operation unit 5 memory 6 display unit 7 relay output unit 8 analog output unit 31 operation processing unit 32 conditional branch processing unit 33 alarm detection unit

Claims (5)

A measuring unit for measuring a predetermined input signal;
An arithmetic processing unit that performs an arithmetic operation using at least one of the measurement result and a predetermined parameter,
A signal output unit that outputs a signal according to the measurement result or the calculation result,
In a measuring device having
Providing a conditional branch processing unit that specifies an operation to be performed on the arithmetic processing unit based on at least one of the measurement result and the parameter,
The signal output unit outputs a signal according to the calculation result. The measuring device according to claim 1, wherein the signal output unit is a relay output unit that outputs a relay on / off signal. The measurement apparatus according to claim 1, wherein the signal output unit is a signal generation unit that generates an operation signal for operating a predetermined control target using the measurement result and the parameter. The measuring device according to claim 1, wherein the signal output unit is an analog output unit that converts a digital value of a measurement result or a calculation result into an analog signal and outputs the result. The measurement apparatus according to claim 1, wherein the branch processing performed by the branch processing unit has a nest structure.

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