JP5444567B2 - Transient data collection system - Google Patents

Description

  The present invention relates to a transient data collection system for monitoring and recording data in a plant facility such as a power plant or a chemical plant.

In recent years, there is an increasing demand for plant facilities such as nuclear power plants to improve availability, robustness, maintainability, and the like. In order to meet such demands, monitoring systems and control systems installed and operating in plant facilities have been gradually digitized.
There are various types of monitoring systems and control systems, one of which is a data collection system for the purpose of monitoring and recording transient phenomena in plant facilities installed in plant facilities.

In general, the system configuration of a data collection system includes a data conversion unit that performs A / D conversion on an electrical signal input from a plant detector (sensor), and a non-volatile storage that performs predetermined processing on the converted data. Data processing unit to be stored in the system, and HMI (Human Machine Interface) unit (terminal) for accessing, displaying, and analyzing these data in various forms, etc. It is fixedly installed as equipment. In particular, a data processing unit in a data collection system aimed at monitoring and recording a transient phenomenon is also referred to as a transient phenomenon recording apparatus.
Prior art documents considered to be related to the present invention are shown in Patent Document 1, Patent Document 2, and Patent Document 3.

JP 2003-67046 A JP 5-19842 JP-A-6-34784

  Many plant facilities are laid on a vast land. In the stationary transient recording device, a large number of data conversion units are connected in order to obtain data from a large number of sensors installed in the large number of plant facilities. The transient recording device receives the data packet sent from the data conversion unit, and performs processing for matching the time series of each data packet.

When transferring data from the data conversion unit to the transient phenomenon recording apparatus, it is necessary to transmit a large amount of data in a short time, and therefore, the overhead accompanying the data transfer needs to be reduced as much as possible. Since the sampling clock used by the A / D converter in the data conversion unit is a sampling clock having a relatively high frequency such as 10 msec, for example, the data conversion unit includes a plurality of sampling clocks in order to reduce data transfer overhead. The data must be held across the data and then transferred to the transient phenomenon recording apparatus. It is also necessary for a plurality of data conversion units to generate data from the sensors in synchronization with a common sampling clock.
As described above, in order to realize the process of holding the data across a plurality of sampling clocks and then transferring the data to the transient phenomenon recording apparatus, a CPU is required not only for the transient phenomenon recording apparatus but also for the data conversion unit. Become. Due to the restriction that the data conversion unit requires a CPU, the data conversion unit has not been downsized so that it can be easily transported.

In particular, even when an abnormal situation occurs in the plant facility at the time of starting the plant facility, a signal output from each sensor at that time may not be taken into the transient phenomenon recording apparatus. That is, there is a case where wiring for acquiring data is not made to the transient phenomenon recording apparatus, and a signal at the time of an important abnormality cannot be recorded. In response to such a situation, the plant facility manager changes the wiring of the data conversion unit so that data can be acquired from sensors that did not acquire data, in preparation for an abnormal situation that may occur again, Transient phenomenon recorders need to rewrite monitoring definition information to detect abnormal situations from signal changes, identify the location of abnormalities, and collect data intensively. It is difficult for the device and the data conversion unit to flexibly cope with such a change in the situation.
In addition, when using a portable data collection device that is commercially available for general purposes, the amount of data collected and stored by the transient recording device is enormous, and therefore it is stored in a general format such as CSV format. This is difficult and is not compatible with a permanent transient recorder, and is not suitable for long-term maintenance and management.

  SUMMARY OF THE INVENTION An object of the present invention is to solve such problems and to provide a transient data collection system that can instantly collect detailed data on the site of a plant facility with a minimum hardware configuration.

  In order to solve the above problems, a transient data collection system of the present invention includes an analog signal input terminal, an A / D converter connected to the analog signal input terminal and outputting analog attribute data, and an A / D converter. A sampling clock generator for supplying a sampling clock, a digital signal input terminal to which digital attribute data is input, analog attribute data and digital attribute data are received, analog attribute information is added to the analog attribute data, and the digital attribute data is added. Adds digital attribute information and adds a channel number to each to form a frame, a decoding unit that extracts analog attribute data and digital attribute data from the frame, a real-time clock that generates time information, and a decoding unit Receive analog attribute data from Analog attribute data ring buffer that accumulates with information, digital attribute data ring buffer that receives digital attribute data from the decoding unit and accumulates with time information, and data stored in the analog attribute data ring buffer, An integration unit that outputs the time series of the data stored in the digital attribute data ring buffer in a matched manner, and an integration ring buffer that accumulates data output by the integration unit.

  In order to instantly collect detailed data at the plant facility site, a small amount of hardware is provided by performing processing to match the time series in which the data is generated with analog signals and digital signals that have different data generation time series. It can be collected efficiently using resources.

  According to the present invention, it is possible to provide a transient data collection system capable of instantaneously collecting detailed data on the site of a plant facility with a minimum hardware configuration.

It is the schematic of a plant facility. It is a block diagram of a portable transient data collection system. It is the schematic which shows the format of the data which the encoder and USB interface part encoded. It is the schematic which shows an example of a flame | frame. It is a figure which shows the signal waveform of an analog signal and a digital signal. It is an example of the data stored in the ring buffer for analog attribute data, the ring buffer for digital attribute data, and the integrated ring buffer. It is a block diagram of a portable transient data collection system.

FIG. 1 is a schematic view of a plant facility.
A large facility 102 to be controlled is installed in the plant facility 101, and a plant device 103 such as a pump or a valve that is a direct control object is provided in the facility 102 to be controlled.
Examples of the control target facility 102 include equipment such as a manufacturing facility, a nuclear reactor, and a blast furnace.
The plant equipment 103 is controlled according to a predetermined control signal by a drive mechanism (not shown). A sensor 104 is provided around the plant equipment 103.
The control device 105 acquires a signal related to the current state from a sensor 104 provided in the periphery of the plant equipment 103 and controls a drive mechanism provided in the plant equipment 103.

On the other hand, the signal of the sensor 104 is also input to the data conversion unit 106. The data conversion unit 106 receives a large amount of data output from each sensor 104, aligns the time series of data for each sensor 104, and outputs the data to the stationary transient phenomenon recording device 107.
The stationary transient phenomenon recording device 107 stores the received data in the nonvolatile storage 108. Further, the stationary transient phenomenon recording device 107 analyzes data stored in the nonvolatile storage 108 in accordance with a command output from the operation terminal 109 and outputs an analysis result to the operation terminal 109.

The number of sensors 104 provided in the plant facility 101 is enormous. For this reason, the stationary transient phenomenon recording device 107 selects the main sensor among all the sensors 104 provided in the plant facility 101 and records the data.
It is assumed that some kind of abnormal situation has occurred in such a plant facility 101. The stationary transient phenomenon recording device 107 records the abnormal situation from the main sensor, but the plant equipment 103 in which the abnormal situation has occurred includes a sensor other than the main sensor that is not subject to data recording. Exists. Therefore, it is necessary to record data from all the sensors provided in the plant equipment 103 in which the abnormal situation has occurred in preparation for the next occurrence of a similar abnormal situation.
In order to collect detailed data from the site of the plant facility in preparation for such a reoccurrence of an abnormal situation, a portable transient data collection system 110 is newly constructed in the present embodiment.

The portable transient data collection system 110 includes a signal collection unit 111 and a data processing unit 112, and is installed in the vicinity of the plant equipment 103.
The signal collection unit 111 includes a circuit such as an A / D converter, converts a signal obtained from the sensor 104 into digital data, and sends the digital data to the data processing unit 112 through the USB cable 113.
The data processing unit 112 is a portable electronic computer, for example, a general-purpose well-known notebook computer.

FIG. 2 is a block diagram of the portable transient data collection system 110.
There are two types of output signals from the sensor 104: analog signals and digital signals. The analog signal is an analog voltage signal obtained from a sensor such as temperature and pressure, and the digital signal is a binary state signal such as a switch.
The signal collection unit 111 includes a plurality of analog signal input terminals 201 that accept analog signals and a plurality of digital signal input terminals 202 that accept digital signals.
An A / D converter 203 is connected to each analog signal input terminal 201. A common sampling clock is supplied from the sampling clock generation unit 204 to each A / D converter 203. The sampling clock is, for example, 10 msec.
A buffer 205 is connected to each digital signal input terminal 202.

For convenience of explanation, the data output from the A / D converter 203 is hereinafter referred to as “analog attribute data”, and the output data of the buffer 205 is referred to as “digital attribute data”.
The analog attribute data and the digital attribute data are input to an encoder / USB interface unit 206 that can be called an encoding unit.
The encoder / USB interface unit 206 adds channel numbers to the analog attribute data and the digital attribute data, respectively, converts the data into serial data, and outputs the serial data to the data processing unit 112 through the USB cable 113.

The encoding process of the encoder / USB interface unit 206 will be described with reference to FIGS.
FIG. 3 is a schematic diagram showing a format of data encoded by the encoder / USB interface unit 206.
The encoder / USB interface unit 206 outputs data in one frame 301 for each sampling clock. That is, the analog attribute data and the digital attribute data are collected into one frame 301 for each sampling clock.

Frame 301 begins with a header 302 and ends with a footer 303. The header 302 and the footer 303 are configured by a predetermined bit string pattern that can be uniquely identified by a decoder / USB interface unit of the data processing unit 112 described later.
The channel number 304 is a number assigned in advance to the analog signal input terminal 201 and the digital signal input terminal 202.
The analog / digital type 305 is a flag for identifying whether the signal of the channel number 304 is an analog signal or a digital signal. The analog attribute data is analog, and the digital attribute data is digital.
The data length 306 is the number of bits of data.
Data 307 is actual data. If the analog / digital type 305 is analog, it is the output bit width of the A / D converter 203, and if it is digital, it is 1 bit.
As described above, the channel number 304, the analog / digital type 305, the data length 306 and the data 307 constitute a cell 308 for transmitting analog attribute data or digital attribute data for one channel.
A separator 309 exists to separate the cells 308 from each other. Like the header 302 and the footer 303, the separator 309 is configured by a predetermined bit string pattern that can be uniquely identified by the decoder / USB interface unit.
When the analog / digital type 305 is analog, a known encoding process such as EFM modulation may be performed so that the bit string pattern does not overlap with the header 302, the footer 303, and the separator 309.

4A and 4B are schematic diagrams illustrating an example of the frame 301. FIG. 4A and 4B, for convenience of explanation, description of the header 302, the footer 303, and the separator 309 is omitted, and only the cell 308 is listed.
Since analog signals may fluctuate constantly, analog attribute data for each channel is output for each sampling clock. On the other hand, since the digital signal indicates the state of the switch, it only needs to be known when the switch changes from on to off or vice versa. Therefore, in FIG. 4A, the cell 308 of digital attribute data is attached after the cell 308 of analog attribute data, but when there is no change in the state of the switch, the cell 308 of digital attribute data as shown in FIG. 4B. There may also be a frame 301 in which no exists. Although not shown, there are two digital attribute data cells 308 in FIG. 4A, but there may be a frame 301 in which only one of them exists.

Returning to FIG. 2 again, the description of the block diagram will be continued.
The frame 301 output from the encoder / USB interface unit 206 is input via the USB cable 113 to the decoder / USB interface unit 207 of the data processing unit 112, which can also be called a decoding unit.
The decoder / USB interface unit 207 extracts the data contained in the cell 308 of each channel from the frame 301 shown in FIG. 3, and the data of the analog attribute data cell 308 is transferred to the analog attribute data ring buffer 208 as a digital attribute. Data in the data cell 308 is output to the ring buffer 209 for digital attribute data.

The analog attribute data ring buffer 208 stores data 307 extracted from each cell 308 of analog attribute data included in the frame 301 and time information obtained from a real time clock (hereinafter “RTC”) 210. The amount of data in the analog attribute data ring buffer 208 is preferably such that the operation of receiving data from the decoder / USB interface unit 207 is not hindered by the operation of writing data to the integrated ring buffer 211 described later.
The format of data stored in the analog attribute data ring buffer 208 will be described later with reference to FIG.

The digital attribute data ring buffer 209 stores data 307 extracted from each cell 308 of digital attribute data included in the frame 301 and time information obtained from the RTC 210. The amount of data in the digital attribute data ring buffer 209 is preferably such that the operation of receiving data from the decoder / USB interface unit 207 is not hindered by the operation of writing data into the integrated ring buffer 211 described later.
The format of data stored in the digital attribute data ring buffer 209 will be described later with reference to FIG.

The RTC 210 is a well-known date and time information generation unit provided in an information processing apparatus such as a general notebook personal computer constituting the data processing unit 112. In the present embodiment, date / time information in units of 0.1 seconds is acquired from the RTC 210.
On the other hand, the sampling clock generated by the sampling clock generation unit 204 in the signal collection unit 111 is 10 msec. Therefore, the sampling clock is the clock with the highest resolution. Therefore, if one frame of data received by the data processing unit 112 at the same time is one record, the number of data records that can be stored in the analog attribute data ring buffer 208 is the digital attribute data ring buffer 209. There are more data records than can be stored in.

  The integration unit 212 converts the data stored in the analog attribute data ring buffer 208 and the data stored in the digital attribute data ring buffer 209 into date / time information stored in the analog attribute data ring buffer 208. Based on, joins are made in the form of equal time series. Specifically, the procedure shown in FIG. 6 is adopted.

The operation of the integration unit 212 will be described with reference to FIGS.
5A, 5B, 5C, and 5D are diagrams showing signal waveforms of an analog signal and a digital signal. The horizontal axis represents time, and T1, T2,... T5 indicate date and time information obtained from the RTC 210.
FIG. 5A is a signal waveform diagram of the signal Ax01 which is an analog signal.
FIG. 5B is a signal waveform diagram of the signal Ax02 that is an analog signal.
FIG. 5C is a signal waveform diagram of the signal Dx01 which is a digital signal.
FIG. 5D is a signal waveform diagram of the signal Dx02 which is a digital signal.

  The RTC 210 outputs date / time information in units of 100 msec. On the other hand, the sampling clock generated by the sampling clock generation unit 204 in the signal collection unit 111 is a 10 msec clock. Therefore, the data processing unit 112 receives ten frames 301 from the signal collection unit 111 between times T1 and T2, and generates ten records in the analog attribute data ring buffer 208. That is, the data related to the signal Ax01 and the signal Ax02 is continuously accumulated in the analog attribute data ring buffer 208 for each sampling clock.

On the other hand, since the cell 308 is generated only when the logical change of the signal line such as a switch occurs in the digital signal, the data of the signal Dx01 and the signal Dx02 includes the time when the logical change of the signal, the type of the signal, The field is divided into contact change information fields and stored in the digital attribute data ring buffer 209.
In the case of FIG. 5C, the signal Dx01 changes at time T2 and time T4.
In the case of FIG. 5D, the signal Dx02 changes at time T3.
The “name, time, and signal change” of the changed signal are discretely stored in the digital attribute data ring buffer 209.

  FIGS. 6A, 6 </ b> B, and 6 </ b> C are examples of data stored in the analog attribute data ring buffer 208, the digital attribute data ring buffer 209, and the integrated ring buffer 211. The data shown in FIG. 6 is based on the signal waveform shown in FIG.

FIG. 6A shows the contents of the ring buffer 208 for analog attribute data. However, specific numerical values are omitted because they are not directly related to the invention.
As described above, since the analog signal is generated by the A / D converter 203 for each sampling clock, there are 10 records of time “T1” in the order sampled within the time “T1” in the “time” field. To do. Similarly, there are 10 records at times “T2”, “T3”, and “T4”. In FIG. 6A, the description of the record in the middle is omitted for the convenience of the drawing.

FIG. 6B shows the contents of the digital attribute data ring buffer 209.
As described above, since the cell 308 is generated only when a logical change of a signal line such as a switch occurs in the digital signal, the data of the signal Dx01 and the signal Dx02 includes the time when the logical change of the signal and the type of the signal occur. And is stored in the digital attribute data ring buffer 209 by being divided into contact change information fields.

FIG. 6C shows the contents of the integrated ring buffer 211.
The “time” field, the “signal Ax01” field, and the “signal Ax02” field copy the contents of the analog attribute data ring buffer 208 as they are. On the other hand, in the “signal Dx01” field and the “signal Dx02” field, data is expanded into each record from the contents of the digital attribute data ring buffer 209. The integration unit 212 executes this expansion processing to combine the contents of the analog attribute data ring buffer 208 and the contents of the digital attribute data ring buffer 209.

The integrated ring buffer 211 is a ring buffer as the name suggests, and old data is overwritten with the latest data.
The transient change detection unit 213 looks at the data stored in the integrated ring buffer 211 and determines whether or not the condition described in the determination condition file is met. The determination condition file 214 describes predetermined conditions for identifying an abnormal situation with respect to the data obtained from the signal collection unit 111. For example, the following conditions are formed.
(1) When a digital signal changes from off to on (or vice versa).
(2) When an analog signal exceeds a predetermined threshold.
(3) When a certain analog signal exceeds a predetermined rate of change within a predetermined time.
(4) When the difference between the first analog signal and the second analog signal exceeds a predetermined threshold.
(5) When the difference between the first analog signal and the second analog signal exceeds a predetermined rate of change within a predetermined time.
(6) When a digital signal has been on (or off) for more than a predetermined time.
Of course, it is possible to combine these conditions (1) to (6) with a logical expression.

  The determination condition file 214 is displayed on the display unit 215 that is a display and edited by the operation unit 216 so that the operator can edit the determination condition file 214. Information between the operation unit 216, the display unit 215, and the determination condition file 214 is controlled by the input / output control unit 217.

When the transient change detection unit 213 determines that the data stored in the integrated ring buffer 211 matches the condition described in the determination condition file 214, the transient change detection unit 213 controls the file system to store the data in the integrated ring buffer 211. Data is written to the file system 219 as a file.
The file system 219 is a function of a program that configures a known file in the nonvolatile storage 108 such as a known hard disk device.
When data is written from the integrated ring buffer 211 to the file system 219, the file format is compatible with the file format of the conventional stationary transient recording device 107.
A file stored in the file system 219 so as to be compatible with the file format of the stationary transient recording device 107 can be taken out through the file interface 220. Various media can be considered for the file interface 220. In addition to a known exchangeable recording medium such as a USB memory or a flash memory, a network can also be used.

The following application examples are possible for the present invention.
(1) The analog attribute data ring buffer 208 can be shared with the integrated ring buffer 211. In this case, the analog attribute data output from the decoder / USB interface unit 207 is directly stored in the integrated ring buffer 211, and the digital attribute data output from the decoder / USB interface unit 207 is temporarily stored in the digital attribute data ring buffer 209. Then, the data is stored in the integrated ring buffer 211 via the integration unit 212.

(2) By utilizing that the sampling clock has the highest resolution, the digital attribute data ring buffer 209 can be replaced with a register.
FIG. 7 is a block diagram of a portable transient data collection system. Note that functional blocks having the same functions as those in FIG.
The difference between the portable transient data collection system 701 and the portable transient data collection system 110 is that some differences exist inside the data processing unit 702.
Analog attribute data output from the decoder / USB interface unit 207 is input to the integrated ring buffer 211 via the integration unit 703.
On the other hand, the digital attribute data output from the decoder / USB interface unit 207 is written in the digital attribute data register 704.
The integration unit 703 records the contents of the digital attribute data register 704 together with the date / time information in the integration ring buffer 211 at the timing of the analog attribute data generated for each frame output from the decoder / USB interface unit 207. With this configuration, the digital attribute data is recorded in the integrated ring buffer 211 for each frame, like the analog attribute data.

In the present embodiment, a portable transient data collection system has been disclosed.
In order to instantly collect detailed data at the plant facility site, a small amount of hardware is provided by performing processing to match the time series in which the data is generated with analog signals and digital signals that have different data generation time series. It can be collected efficiently using resources.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and other modifications may be made without departing from the gist of the present invention described in the claims. Includes application examples.

  DESCRIPTION OF SYMBOLS 101 ... Plant facility, 102 ... Control object equipment, 103 ... Plant equipment, 104 ... Sensor, 105 ... Control device, 106 ... Data conversion unit, 107 ... Stationary type transient recording device, 108 ... Nonvolatile storage, 109 ... Operation terminal , 110 ... Portable transient data collection system, 111 ... Signal collection unit, 112 ... Data processing unit, 113 ... USB cable, 201 ... Analog signal input terminal, 202 ... Digital signal input terminal, 203 ... A / D converter, 204 ... Sampling clock generation unit 205. Buffer 206. Encoder / USB interface unit 207 Decoder / USB interface unit 208 Analog ring data ring buffer 209 Digital attribute data ring buffer 210 RTC 211 Integrated re Buffer, 212 ... integration unit, 213 ... transient change detection unit, 214 ... determination condition file, 215 ... display unit, 216 ... operation unit, 217 ... input / output control unit, 219 ... file system, 220 ... file interface, 301 ... Frame, 302 ... Header, 303 ... Footer, 304 ... Channel number, 305 ... Analog / digital type, 306 ... Data length, 307 ... Data, 308 ... Cell, 309 ... Separator, 701 ... Portable transient data collection system, 702 ... Data processing unit 703 ... integration unit 704 ... digital attribute data register

Claims (4)

An analog signal input terminal;
An A / D converter connected to the analog signal input terminal and outputting analog attribute data;
A sampling clock generator for supplying a sampling clock to the A / D converter;
A digital signal input terminal to which digital attribute data is input;
The analog attribute data and the digital attribute data are received, analog attribute information is added to the analog attribute data, digital attribute information is added to the digital attribute data, and a channel number is assigned to each to form a frame. An encoding section;
A decoding unit for extracting the analog attribute data and the digital attribute data from the frame;
A real-time clock that generates time information,
An analog attribute data ring buffer for receiving the analog attribute data from the decoding unit and storing the analog attribute data together with the time information;
A digital attribute data ring buffer that receives the digital attribute data from the decoding unit and stores the digital attribute data together with the time information;
An integration unit for matching the time series of the data stored in the digital attribute data ring buffer and outputting the data stored in the analog attribute data ring buffer; and
A transient data collection system comprising an integrated ring buffer for storing data output from the integration unit. Furthermore,
A file system for storing the data in the integrated ring buffer as a file;
A transient change detection unit that monitors data in the integrated ring buffer and controls the file system to generate the file when the data in the integrated ring buffer satisfies a predetermined condition;
The transient data collection system according to claim 1, further comprising a file interface for retrieving the file from the file system.   The transient data collection system according to claim 1, wherein the analog attribute data ring buffer is a part of the integrated ring buffer. An analog signal input terminal;
An A / D converter connected to the analog signal input terminal and outputting analog attribute data;
A sampling clock generator for supplying a sampling clock to the A / D converter;
A digital signal input terminal to which digital attribute data is input;
The analog attribute data and the digital attribute data are received, analog attribute information is added to the analog attribute data, digital attribute information is added to the digital attribute data, and a channel number is assigned to each to form a frame. An encoding section;
A decoding unit for extracting the analog attribute data and the digital attribute data from the frame;
A real-time clock that generates time information,
A digital attribute data register that receives the digital attribute data from the decoding unit and stores state information;
An integration unit that receives the analog attribute data from the decoding unit each time the decoding unit receives the frame, and acquires the time information and the state information;
A transient data collection system comprising an integrated ring buffer for storing data output from the integration unit.

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