JPH08338740A - Automatic unit switching device - Google Patents

Abstract

PURPOSE: To change over unit systems while minimizing an effect on plant monitoring functions, by selecting automatically an optimum case out of changeover cases on the basis of existing conversion information. CONSTITUTION: Process data fetched from a plant by a computer are processed in conformity with conversion specification information 35 by executing various conversions of engineering values, various computations, etc., in accordance with prescribed procedures. Then, these data are stored as an engineering unit data base in a plant data base 32 in a storage device. In a unit changeover processing 38, engineering units are fetched from the conversion specification information 35, changeover information corresponding to the engineering units are fetched and a case number matched with a conversion range before changeover is retrieved out of the conversion information and determined. According to a coefficient and the number of digits of the determined case number, the engineering values of the plant data are converted into the ones of a fresh engineering unit system and these are converted into display/print data. According to this constitution, effect on the existing software is minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic unit switching device.

[0002]

2. Description of the Related Art Conventionally, in order to monitor the operating state of a plant, a plant monitoring device which edits / processes various data obtained from the plant using a computer and outputs the data to a CRT display and a printer is already widely known. And
The unit system that has been put to practical use is generally used for monitoring, and the unit system is not switched.

[0003]

However, the plant monitoring system is shifting from the MKS unit system to the SI unit system. Further, there is a tendency that the MKS / SI unit system coexists in consideration of the influence on the operator.

An object of the present invention is to make it possible to switch the unit system while minimizing the influence on the plant monitoring function.

[0005]

In order to achieve the above object, the present invention provides existing conversion information (engineering unit, conversion range).
Based on the above, the prefix of the new unit and the switching coefficient to the new unit that best match the existing conversion information are determined from the preset switching cases.

[0006]

According to the present invention, the optimum case is automatically selected from the cases in which the switching coefficient for the new unit system and the prefix of the new unit are designated in advance based on the existing conversion information. It is possible to reliably switch to the new unit system without any complicated work such as reviewing the CRT, editing the CRT display and modifying the print editing program.

[0007]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows a flowchart of an automatic unit switching device according to an embodiment of the present invention.

In FIG. 1, the plant 1 to be monitored for operation is equipped with a detector for continuously detecting analog information and digital information in order to detect each operating state and the like. In the process data detected by these detectors, the voltage and current which are analog information are digit values by the process input / output device 2, and the switch contact signals and voltage levels of each part which are digital information are digit values 1 or 2. Converted to 0. The electronic computer 3 takes in these process data from the plant 1 via the process input / output device 2 through a known input processing program periodically or on demand. The process data thus captured is stored inside the computer 3 as shown in FIG.
A publicly known data conversion program 31 executes various engineering value conversions from the digit values, various calculations, etc. in accordance with a conversion specification information 35 according to a predetermined procedure, and then carries out processing as engineering unit data in a plant database 3 in a storage device of a computer 3.
It is stored after being aggregated into 2. The CRT display data editing process 33 and the print data editing process 34 further edit and process the data stored in the plant database 32 as engineering unit data into a display / printing unit or a graphic, and a CRT control device 4 / printer control device. 6 is provided to the operator as a display data or a print data to provide the operator with a visible screen / form.

In the edit processing for display / printing, the number of digits required for operation monitoring of the plant is set in advance as display specifications / printing specifications, and editing is performed according to the specifications. Therefore, switching the unit system also changes the display specifications / printing specifications, and a considerable amount of work is required.

In the present invention, the unit switching information 39 and the unit switching processing 39 are provided in order to enable the unit switching without being aware of the display / print specifications as described above. As shown in FIG. 3, in the unit switching process 38, the existing conversion specification information 35
The engineering unit is fetched from, and the switching information corresponding to the engineering unit is fetched from the unit switching information 39. A case number that matches the conversion range before switching is searched from the conversion information and determined. Then, the engineering value of the plant data is converted into the engineering value of the new engineering unit system according to the determined coefficient and the number of digits of the case NO, and converted into display / print data.

FIG. 4 shows a specific example of pressure MKS / SI unit switching. As shown in the conversion example of FIG. 4, the conversion range is 0 to 1,0 to 10,0 to 100 kg / cm for the unit of kg / cm ^2.
In the case of ² , the number of digits is 6 and the number of digits below the decimal is 5, 3,
Set to 2. This is SI unit and KPa (kilopascal)
Switch to 0-9 for conversion range 0-1, 0-10
It is reasonable that it is 8.0665,0-980.665,
It is necessary to optimize the number of digits below the decimal to 3,2. In addition, 0 to 98066.5 KPa for 0 to 100 kg / cm ² and overflow at 6 digits, so 0 to 9.8067
Set to MPa (megapascal) and change the number of decimal places to 4.

[0012]

According to the automatic unit switching device of the present invention, it is possible to change the unit system while minimizing the influence on the existing software. There is no need to be conscious of individual data, and all data can be supported simply by creating switching information from switching rules. Further, it is possible to exert an effect even when switching the unit system of the existing system.

[Brief description of drawings]

FIG. 1 is a flowchart of a plant monitoring device automatic unit switching device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing existing data conversion and display editing processing.

FIG. 3 is an explanatory view showing a specific means of a switching method for automatic unit switching according to the present invention.

FIG. 4 is an explanatory diagram showing a specific example of an automatic unit switching device.

[Explanation of symbols]

32 ... Plant database, 35 ... Conversion specification information, 3
7 ... Display / print specifications, 38 ... Unit switching processing, 39 ... Unit switching information.

Claims (1)

[Claims] 1. A process input / output device for inputting / outputting various plant data, an electronic computer for editing / processing for displaying / printing the input data, and an image data signal for outputting the display data to a CRT display. Controller to convert,
An automatic unit switching device comprising a control device for converting print data into a data signal for outputting to a printer, and automatically switching an engineering unit system of monitoring data.