JPH10198884A - Transmitter with abnormality output function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a high-level and exact control and efficient maintenance management, by providing a function for fluctuating a transmission signal while selecting a time sequential pattern corresponding to the contents of preset abnormality or alarm when any abnormality is detected or the call of alarm is originated. SOLUTION: An arithmetic processor 10 performs the detection of abnormality in measured value, the call origination of alarm corresponding to, the measured value, and the self-diagnosis of transmitter itself. In the case of self- diagnosis, abnormality is detected by discriminating the diagnosed result after diagnosing the operating states of pre-processing circuit including a multiplexer 8, PGA 9 and A/D converter 6, arithmetic processor 10 including a microprocessor 2, volatile memory 1 and non-volatile memory 1', output interface 7 and power source circuit. In the case of abnormality output processing, a current signal is fluctuated by controlling the output interface 7 while selectively referring to the time sequential pattern previously stored in the non-volatile memory 1' corresponding to the contents of abnormality or alarm detected in every discriminating processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transmitter having an abnormal output function.

[0002]

2. Description of the Related Art The basic function of a transmitter in industrial measurement is to convert a process quantity into another physical quantity and transmit a transmission output corresponding to any value within a preset full-scale range to an external receiver. Is to transmit. Today, electronic methods that convert process quantities into electrical signals and output them are the mainstream. In addition to the function of transmitting measurement values and control signals to an external receiver with the use of a microprocessor, detection of abnormal measurement values, Products with advanced functions including self-diagnosis and alarm calling are common, but conventional technologies
If an abnormality in the measured value or an abnormality in the self-diagnosis result is detected,
Alternatively, even when various alarms are called, or when a plurality of abnormalities and alarms are simultaneously generated, only the abnormalities and the presence or absence of the alarms are determined by any of the methods of burn-up, burn-down, and data hold of the transmission output. Has been implemented. Each function performs an over- or under-scale output from a preset full-scale range or holds an output value in the event of an error, making it possible to visually check the level and determine the level with an external receiver. Is to detect the occurrence of External receivers are burn-up, burn-down,
By detecting the data hold, a preset process can be performed.

However, even when an abnormality is detected, the transmission can be performed only by one of the burn-up, burn-down, and data hold operations of the transmission output of the transmitter. However, it is not possible to determine the nature of the abnormality, and it is not possible to perform more sophisticated and accurate notification, control, and efficiency of maintenance management. On the other hand, a method is disclosed in which a digital communication signal is superimposed on a transmission output of a transmitter and information on a measurement value abnormality, a self-diagnosis, and an alarm are transmitted together with process information.
Transmitters and external receivers require dedicated digital communication circuits and communication processing procedures, and external receivers process digital communication signals and provide conversion functions that can visually recognize the contents of abnormalities or alarms. This method is not always easy because it requires a display function.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to the development of a transmitter having a function of detecting an abnormality of a measured value or an abnormal operation of the transmitter itself and issuing various alarms.

[0005] Further, the present invention provides a conventional technique for burning up, detecting abnormalities in measured values, abnormal operations of the transmitter itself, and calling out various alarms during measurement.
Resolved the problem that the details of the error could not be transmitted to the upper-level receiver because the method was limited to fixing the transmission output such as burn-down and data hold. An abnormality output method of a transmitter having a function capable of discriminating an abnormality content by monitoring is provided.

Further, according to the present invention, even when an abnormality including a measurement value abnormality or an abnormality in the operation of the transmitter itself during measurement or an abnormality including a call for various alarms occurs, the prior art receives the details of the abnormality content at a higher level. Solves the problem of requiring a dedicated digital communication circuit and digital communication processing procedure for transmission to the transmitter, and monitors the transmission output of the transmitter with an external receiver to provide a function that can easily determine the type of error. An abnormal output method of an electronic intelligent transmitter having the same is provided.

In particular, the present invention provides a failure output method for an electronic intelligent transmitter having a function of detecting a failure of a measured value or an abnormal operation of the transmitter itself, and issuing various alarms.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a transmitter abnormal output method, comprising: a detector for selectively sensing one or more physical quantities; and a mechanical variable or electric signal output from the detector. Computing means for correcting, converting means for converting to another variable proportional to the calculation result by the user's selection, and transmitting a transmission signal corresponding to the physical quantity obtained by the conversion result to an external receiver. A transmitter, comprising: one or both of a means for detecting an abnormality in the measurement result and a means for calling an alarm corresponding to the measurement result, wherein the abnormality is detected or the alarm is detected. When a call is made, the transmission signal is configured to have a function of selecting and changing a time-series pattern corresponding to the content of a preset abnormality or warning.

Further, according to the present invention, there is provided a transmitter abnormal output method, wherein at least one of the apparatus constituent elements including the detector, the arithmetic means, the converting means, the transmitting means, the operation control means, and the operation power supply source is provided. A transmitter characterized by having a self-diagnosis means for detecting an abnormality occurring in the transmitter, wherein when the abnormality is detected, a transmission signal is changed by selecting a time-series pattern corresponding to the content of a preset abnormality. It is constituted by means characterized by having a function.

Further, in the transmitter abnormal output method according to the present invention, the predetermined time-series pattern includes alphanumeric characters, hiragana, katakana, characters including kanji or alphanumeric characters, hiragana,
It is constituted by means characterized by being a figure reminiscent of characters including katakana and kanji.

According to the present invention, even when an abnormality in the measured value or an abnormality in the self-diagnosis result is detected, or when various alarms are issued, or when a plurality of abnormalities and alarms are simultaneously generated, a predetermined time is set. By selecting a sequence pattern to fluctuate the transmission output and transmitting the presence / absence of an abnormality and an alarm and the contents thereof to an external receiver, more advanced and accurate notification and control, and efficient maintenance management become possible. The transmitter and external receiver do not require a dedicated digital communication circuit and digital communication processing procedure, and it is possible to determine the content of the abnormality or alarm simply by monitoring the transmission output of the transmitter with the external receiver, Costs in manufacturing, installation, use, and maintenance can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. An electronic differential pressure transmitter using a semiconductor strain gauge as a differential pressure detecting means is configured as shown in FIG. In the figure, the differential pressure, temperature, and static pressure, which are physical quantities, are sensed by the differential pressure sensor 3, temperature sensor 4, and static pressure sensor 5, respectively, and output an electric signal corresponding to the intensity. The multiplexer 8 enables amplification and A / D conversion by a pair of PGA 9 and the A / D converter 6 by switching and inputting the electric signal of each sensor every unit time. Also, the PGA 9 does not include element products that require adjustment, such as a variable resistor and a variable capacitor,
The amplification degree can be fixed by the signal of the microprocessor 2. The differential pressure signal, the temperature signal, and the static pressure signal digitized by the A / D converter 6 are input to an arithmetic processing device 10 mainly including the microprocessor 2. The arithmetic processing unit 10 includes, in addition to the microprocessor 2,
The output signal of the operation is composed of a volatile memory 1 and a non-volatile memory 1 '. The result is displayed by the output interface 7 or converted into a current signal (4 to 20 mA DC) and transmitted to the outside of the measurement system.

With such a configuration, compensation data indicating the inherent characteristics of the device is stored in the nonvolatile memory 1 'of the arithmetic processing device 10 shown in FIG. 1, and the digitized difference data read at the time of measurement is stored. The microprocessor 2 can be read out by referring to compensation data corresponding to the pressure signal E, the temperature signal T, and the static pressure signal P. Arithmetic processing unit 10
Performs a preset correction calculation process to obtain corrected measurement data g (E, T, P). The differential pressure value ΔP = g (E, T, P) thus obtained is output from the output interface 7
Is displayed or converted into a current signal (DC 4 to 20 mA) and transmitted outside the measurement system.

The arithmetic processing unit 10 further performs control and arithmetic processing according to the flowchart shown in FIG. 2 to detect abnormality of the measured value, issue an alarm corresponding to the measured value, and perform self-diagnosis of the transmitter itself. The digital pressure difference signal E, the temperature signal T, the static pressure signal P, the differential pressure value, the temperature, and the static pressure value are digitized in FIG. To detect abnormalities in the measured values. Further, an alarm call determination process 12 of the differential pressure value, the temperature, and the static pressure value is performed, and an alarm is generated by comparing the difference with a predetermined determination threshold value. The self-diagnosis processing 13 includes a pre-processing circuit including a multiplexer 8, a PGA 9, and an A / D converter 6, an arithmetic processing unit 10 including a microprocessor 2, a volatile memory 1, and a nonvolatile memory 1 ', an output interface 7, and an operating state of a power supply circuit. Diagnosis is performed, and an abnormality is detected by determining the diagnosis result. Abnormal output processing 1
4 selects and refers to a time-series pattern previously stored in the non-volatile memory 1 ′ according to the content of the abnormality or alarm detected in each determination process, and controls the output interface 7 to control the current signal (DC 4 ２０20 mA).

FIG. 3 shows a time-series pattern of the transmitter output. An example in which the output change is a regular pattern is shown in a time-series pattern example 1, and an example in the case of a figure reminiscent of a character is shown in a time-series pattern. This is shown in Pattern Example 2. FIGS. 4 and 5 show an example in which the pattern of the transmitter output is a figure reminiscent of a character, in which the characters to be recalled are alphabets and numerals. The time-series pattern corresponding to the content of the abnormality or the alarm is configured to be output as shown in FIGS. 3, 4, and 5, and is stored in the nonvolatile memory 1 '.

When an abnormality or an alarm is output, the output is varied in a predetermined time interval and amplitude range with reference to a time-series pattern corresponding to the abnormality or the alarm transmitted from the nonvolatile memory 1. The time interval set at this time is set to be sufficiently long in comparison with the recording interval of the external receiver or the feeding speed of the recording paper so that the time series pattern can be clearly discriminated by the external receiver. ,
A certain appropriate time interval is determined, or the time interval is set to be variable according to the time series pattern or the setting of the external receiver. In particular, the pattern example 2 in FIG.
When outputting a character or graphic as shown in (1), output it at a time interval that is sufficiently short for the time required to output only one character or graphic and that is sufficient for the receiving function of the external receiver to follow Is vibrated so that the inside of the time-series pattern is varied. As for the time-series pattern of the transmitter, output ON / OFF and output restriction can be performed by extending functions such as providing a memory switch and a toggle switch as necessary.

The transmitted current signal (DC 4 to 20 mA)
Is received by an external receiver such as a recorder or a higher-level monitoring device, and the contents of the abnormality or alarm can be recognized by displaying them in a time series on a recording paper or a trend display device. Furthermore, by taking in the contents of the abnormality or the alarm into the control device, it is possible to further enhance the control at the time of the abnormality.

As described above, an embodiment of an abnormal output method in which an electronic differential pressure transmitter can determine the content of an abnormality or an alarm simply by continuously monitoring the transmission output of the transmitter with an external receiver. Although the present invention has been described, the present invention is not limited to this, and it does not depart from the gist of the present invention irrespective of the content of the information to be transmitted and the method of using the transmitted information in the external receiver. Modifications may be made.

[0019]

The abnormal output method of the transmitter according to the present invention is as follows.
A transmitter that has the function of detecting abnormalities in measured values and the transmitter's own operation, and issuing various alarms. During measurement, it can detect abnormalities in measured values and the transmitter itself, and emit various alarms. Even if an abnormality including a call occurs, it is possible to easily determine the nature of the abnormality simply by monitoring the transmission output of the transmitter with an external receiver, and to improve the efficiency of monitoring work and the advanced control and transmission of abnormal conditions. It is possible to realize a transmitter that enables efficient maintenance of the transmitter. In addition, there is no need for a dedicated digital communication circuit and a digital communication processing procedure for transmitting the details of the abnormal content to the higher-level receiver, which is advantageous in reducing manufacturing costs. In addition, since an external receiver does not require a special demodulation function or digital communication circuit, commonly used recorders and monitoring devices can be used, reducing labor and costs associated with installation, use, and maintenance. Is advantageous.

Therefore, it is possible to realize a transmitter capable of transmitting the contents of an abnormality or an alarm occurring at the time of measurement only by monitoring the transmission output of the transmitter without using particularly sophisticated communication means. Therefore, the efficiency of monitoring work and the sophistication of control at the time of abnormality can be easily realized, which is advantageous in reducing the labor and cost related to manufacturing, installation, use, and maintenance management.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a compensation calculation process of a semiconductor strain gauge.

FIG. 2 is a flowchart of a transmitter abnormality detection and output process.

FIG. 3 is an explanatory diagram of a time-series pattern of a transmitter output.

FIG. 4 is an explanatory diagram of a time-series pattern (alphabet) of a transmitter output.

FIG. 5 is an explanatory diagram of a time-series pattern (numerical) of a transmitter output.

[Explanation of symbols]

1, 1 ': memory means, 2: digital operation means, 3: differential pressure sensor, 4: static pressure sensor, 5: temperature sensor.

Claims (4)

[Claims] 1. A detector for selectively sensing one or a plurality of physical quantities, an arithmetic means for correcting a mechanical variable or an electric signal output from the detector, and a proportional to an arithmetic result by a user's selection. And a transmission unit capable of transmitting a transmission signal corresponding to the physical quantity obtained as a result of the conversion to an external receiver,
In a transmitter having one or both of a measurement result abnormality detection unit and an alarm calling unit corresponding to the measurement result, when the abnormality is detected or the alarm is issued,
A transmitter with an abnormal output function, having a function of selecting and changing a time-series pattern corresponding to the content of a preset abnormality or alarm in a transmission signal. 2. A detector for selectively sensing one or a plurality of physical quantities, an arithmetic means for correcting a mechanical variable or an electric signal output from the detector, and a proportional to an arithmetic result by a user's selection. And a transmission unit capable of transmitting a transmission signal corresponding to the physical quantity obtained as a result of the conversion to an external receiver,
A transmitter having self-diagnosis means for detecting an abnormality occurring in any or a plurality of device components including the detector, the calculation means, the conversion means, the transmission means, the operation control means, and the operation power supply source; A transmitter with an abnormality output function, having a function of, when detecting the abnormality, selecting and changing a time-series pattern corresponding to the content of the abnormality set in advance. 3. The transmitter with an abnormal output function according to claim 1, wherein said time-series pattern is a figure reminiscent of characters including alphanumeric characters, hiragana, katakana, kanji or characters including alphanumeric characters, hiragana, katakana, kanji. . 4. The transmitter with an abnormal output function according to claim 2, wherein the time-series pattern is a figure reminiscent of characters including alphanumeric characters, hiragana, katakana, kanji or characters including alphanumeric characters, hiragana, katakana, kanji. .