RU51729U1 - CALIBRATION SYSTEM OF MEASURING CHANNELS OF AUTOMATED SYSTEMS OF CONTROL OF TECHNOLOGICAL PROCESSES - Google Patents

Abstract

The utility model relates to computing, to its application in the field of metrology, namely, to calibration of measuring channels of automated process control systems (ACS TP) of industrial facilities, for example, heat power engineering.

The objective of the utility model was to create an effective system for calibrating the measuring channel of an automatic process control system, by automating the process.

The problem is solved due to the fact that in the calibration system of measuring channels of automated process control systems, including a stationary personal computer containing a program for identifying and calibrating channels. including a set of necessary reference signals for each channel. connected to the output of the measuring channel and the communication unit, the latter consists of two radio modems, the first radio modem is connected to a stationary personal computer, and the second radio modem is connected to a pocket personal computer, the output of which is connected to the input of the reference signal generator, the output of which is connected to the input of the measuring channel.

Description

The utility model relates to computing, to its application in the field of metrology, namely, calibration of measuring channels of automated process control systems (ACS TP) of industrial facilities, for example, heat power engineering.

The automated process control system of heat power facilities refers to systems of the type IS-2 "State standard R F. State system for ensuring the uniformity of measurements. Metrological support for measuring systems. Basic provisions. Gosstandart of Russia. Moscow, 2002" ./ 1 /.

One of the functions of ACS TP is the measurement of physical quantities (for example, pressures, flow rates, temperatures). In a distributed architecture, process control systems emit a measuring channel (IR). The measuring channel has metrological characteristics. affecting the accuracy of the measurement result. In practice, periodic confirmation of metrological characteristics, or calibration, of the measuring channels / 1 / is required.

The measuring channel is subjected to component-wise calibration: dismantled primary measuring transducers (sensors) in laboratory conditions: the secondary part is a complex component, including communication lines, at the installation site of the measuring system / 1 /.

A known system patented under the name "PDA INSTRUMENT / PROCESS CALIBRATOR" (WO 0215109 European Patent Office) / 2 /.

The technical solution is the so-called Calibrator, which combines the source of the reference signal or encoder in its case, KPK (personal digital assistant or handheld computer), which provides the user with input means for receiving user instructions for controlling the source calibrator, as well as output means, the main graphic in order to display identification information and calibration results. The calibrator also includes a signal sensor for measuring the magnitude of the electrical signal and an interface for transmitting the magnitude of the measured signal to the handheld computer.

Significant disadvantages of this solution are:

- The calibrator is designed to calibrate non-extended measuring channels with measuring modules located near the sensors and providing a digital value of the measured signal.

- Such a calibrator is not suitable for calibrating extended measuring channels of industrial control systems, in which the measurement of the value measured by the measuring channel takes place on some stationary computer, where the received data are statistically processed. Closest to the technical features of the proposed technical solution is the existing calibration system for the measuring channels, which involves the work of two specialist calibrators. One of them works on a stationary computer, where a calibration program is launched, which receives the measured values from the calibrated channel, generates a sample, calculates the metrological characteristics and provides information on the calibration result in the form of a certificate of validity for the channel. The second submits to the input of the measuring channel some values of the reference signal, which the first specialist reports to him.

"State Committee of the Russian Federation for Standardization, Metrology and Certification. All-Russian Research Institute of Metrology

Services (VNIIMS). Recommendation. State system for ensuring the uniformity of measurements. Metrological characteristics of measuring systems. Nomenclature. Principles of regulation, definition and control. MI 2439-97. Moscow 1997. "/ 3 /" Methodology for acceptance, adjustment and commissioning of measuring channels of information-measuring systems. RD 153-34.0-11.204-97. ORGRES Excellence Service. Moscow 1999 "./ 4 /.

The existing method for calibrating the measuring channels is not efficient enough due to the considerable time spent on calibrating one channel. This is due to the involvement of manual labor, the imperfection of communication facilities, as well as the user interface of the calibration program.

In particular, the disadvantages of the user interface include the need to manually enter process settings, such as channel accuracy class, sections of the measurement range, units, serial numbers of channels, and others. This must be done when checking each channel.

The objective of the utility model is the creation of a more efficient system for calibrating the measuring channel of the automated process control system, by automating the process.

The problem is solved due to the fact that in the well-known calibration system of the measuring channels, including a stationary personal computer (SEC), containing a program for identifying and calibrating the channels, including a set of necessary reference signals for each channel to which the output of the measuring channel is connected, and the unit communication link, the first and second radio modems are used as the communication unit, the first radio modem is connected to a stationary personal computer, the second radio modem is connected to a handheld personal computer y, the output of the reference signal generator is connected to the input of the measuring channel, the input of which is connected to the output of a personal digital assistant (PDA), which controls the generator according to the commands received through the radio modems from the SEC.

The essence of the proposed technical solution is that through the use of PDAs, a programmable generator of the reference signal and wireless communication technologies, it was possible to reduce the manual labor spent on the calibration process. The calibration program, launched on a stationary PC, works in automatic mode and is controlled by the program from the PDA via wireless communication.

Positive in the proposed calibration system is that the storage of all the information necessary for initializing the calibration process about the calibrated measuring channel is carried out in a database on a stationary PC. The process can be controlled by one person, from a personal digital assistant. Description of the calibration system for the measuring channels of the automated process control system

The description of the IR calibration system is illustrated in the figure, where figure 1 shows the structural diagram of the system.

The following notation is introduced in the figure:

1. Measuring channel of industrial control system.

2. Stationary personal computer (SEC) for metrological data processing.

3. Pocket PC (PDA)

4. The first radio modem

5. The second radio modem.

6. Programmable reference signal generator.

7. The sensor.

8. The input of the measuring channel for connecting the sensor.

The system includes a stationary personal computer for metrological data processing 2, connected to the output of the measuring channel 1 and the first radio modem 4; Pocket PC 3, to which a second

ramodem 4; a personal digital assistant 3, to which a second radio modem 5 is connected, and a programmable reference signal generator 6, the output of which is connected to the input 8 of the measuring channel 1.

Description of the functioning of the calibration system

1. Disconnect the sensor 7 and connect the reference signal generator 6 to the input of the measuring channel 8.

2. The establishment of communication between the SEC 2 and the PDA 3 through the second and first radio modems.

3. Selecting a channel by its code or name on the PDA interface 3. When choosing a channel, a request is sent to the SEC on which all the necessary information about this channel is selected from the database or from the list of measuring channels:

measuring range, channel accuracy class, sensor information (type, name, accuracy class), serial number of the measuring module, other information necessary for organizing the calibration process and for entering it into the certificate.

4. Launch of an automatic procedure for collecting measured values and statistical processing of the sample. After the signal from the PDA 3 on readiness, the SEC program starts transmitting tasks to the reference signal generator (calibrator) 6. In each cycle (cross-section of the measurement range), the stationary PC waits for a response from the PDA about the value set at the channel input, and then collects the channel measured values with a given period values.

5. Monitoring the calibration process, viewing the results. During the automatic execution of the calibration process, the PDA displays information on the progress of the channel calibration process: the current measured value, the deviation of this value from the reference, and other service information.

In a specific implementation of the utility model, a personal digital assistant (PDA) with an RS232 interface and an infrared port (IKP) realizing the functions of the second RS232 interface was used. A programmable calibrator is connected to the first RS232 interface. The radio modem connects to the PDA via infrared. The calibrator is connected to the input of the measuring channel instead of the corresponding sensor. Radio modems PDA and stationary PC provide wireless communication between computers. The main part of the functions for calibrating IR is solved on a PDA. The PDA has software installed that controls the calibrator via the RS232 interface and receives corresponding instructions from a stationary workstation via a radio modem. Also, the stationary PC program transfers to the PDA other service information about the calibration process. The calibrator is used to generate the required value at the input of an IR analog signal or emulate a resistance store.

As a generator of the reference signal (calibrator), a calibrator was selected with the possibility of programming it through the RS232 interface, which makes it possible to avoid manually entering instructions for setting a particular value on the calibrator.

To provide wireless communications, the invention uses radio modems that provide the necessary reliability and noise immunity of communications in an industrial facility.

Information Sources Used

1. The state standard of the Russian Federation. State system for ensuring the uniformity of measurements. Metrological support of measuring systems. The main provisions. Gosstandart of Russia. Moscow, 2002.

2. Patent No. WO 0215109, European Patent Office, G 06 F 19/00, dated 21.02.2002.

"PDA INSTRUMENT / PROCESS CALIBRATOR"

3. The State Committee of the Russian Federation for Standardization, Metrology and Certification. All-Russian Research Institute of Metrological Service (VNIIMS). Recommendation. State system for ensuring the uniformity of measurements. Metrological characteristics of measuring systems. Nomenclature. Principles of regulation, definition and control. MI 2439-97. Moscow 1997.

4. Methods of acceptance from commissioning of the measuring channels of information-measuring systems. RD 153-34.0-11.204-97. ORGRES Excellence Service. Moscow 1999.

5. The state system for ensuring the uniformity of measurements. Metrology. Key terms and definitions. Interstate Council for Standardization, Metrology and Certification. Minsk. 2000.

Claims (1)

A calibration system for measuring channels of automated process control systems, including a stationary personal computer containing a program for identifying and calibrating channels, including a set of necessary reference signals for each channel connected to the output of the measuring channel, and a communication unit, characterized in that the communication unit consists of two radio modems, the first radio modem is connected to a stationary personal computer, and the second radio modem is connected to a handheld personal computer, to the output whose input is connected the reference signal generator, whose output is connected to an input of the measuring channel.