JPH04337418A - Digital indicator - Google Patents

Abstract

PURPOSE:To obtain a digital indicator which can carry out display of every measurement unit through one hardware. CONSTITUTION:A value and a unit code of process measurement signal are input at the same time through an input signal cable 1, and a value separated by a value/unit separation part 6 through an A/D conversion part 5 is displayed on a segment LED display part 2 through a drive part 7 for value display, while a unit name of the separated unit code is determined based on a correspondent list of a ROM 8a, and the unit name is displayed on a dot matrix part 3 through a drive part 8 for unit display. Many units can be displayed by one digital indicator.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital indicator used for digitally displaying process measurement values for plant control.

0002

2. Description of the Related Art FIG. 3 is a perspective view showing a conventional digital indicator. In the figure, 1 is a signal input cable, 2 is a 7
A segment LED display section, 9 a unit display section, and 4 a main body chassis. FIG. 4 is a functional block diagram of the digital indicator, in which 5 is an input signal A/D conversion section, and 7 is a numerical display drive section.

Next, the operation will be explained. Process measurement signals output from sensors and converters are transmitted through a signal input cable 1 such as optical, coaxial, or twisted pair.
It is input to the digital indicator in the form of a BCD code, 1-5V, 4-20mA, etc. signal. This process measurement signal is digitized by an A/D converter 5 in the main body chassis 4, and displayed on a 7-segment LED display 2 through a numerical display drive 7. The unit display section 9 is for recognizing the unit of the numerical value displayed on the 7-segment LED display section 2, and is usually engraved or printed on the front part of the main body chassis 4, or printed on an acrylic plate or the like. The unit name is displayed in a backlight.

0004

[Problems to be Solved by the Invention] Since the conventional digital indicator is configured as described above, the process measurement signal is input individually for each measurement engineering unit, so the unit display on the front of the main body chassis 4 is It was necessary to prepare part 9 at the hardware level for each measurement engineering unit. Therefore, 2
There has been a problem in that a single digital indicator cannot respond to requests for displaying weight units or triple units.

[0005] This invention was made to solve the above-mentioned problems, and the hardware of one digital indicator can handle the display of measured values of all measurement loops. The purpose of this invention is to obtain a digital indicator that can display measured values in multiple units.

[0006]

[Means for Solving the Problems] A digital indicator according to the present invention is configured to input a signal consisting of a measured numerical value and a unit code indicating its unit name, and from this input signal, the numerical value and the unit are inputted. The code is separated from the unit code, the unit name corresponding to the separated unit code is obtained from a correspondence table, and the unit name and the separated numerical value are displayed on respective display means.

[0007]

[Operation] The digital indicator according to the present invention can display measured values in all engineering units with one piece of hardware, and can display multiple units such as double and triple units.

[0008]

[Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. In Figure 1, 1 is an input signal cable that simultaneously transmits a process measurement signal and a unit code indicating its unit name, 2 is an input signal cable that displays the numerical value of the process measurement signal 7
A segment LED display section, 3 a dot matrix display section for displaying numerical units, and 4 a main chassis housing a display drive unit and the like therein.

FIG. 2 is a functional block diagram of this digital indicator. In FIG. 2, 5 is an A/D converter that converts analog input signals (1-5VDC, 4-20mADC, etc.) into digital signals, and 6 is the numerical value and unit code of the process measurement signal input through the input signal cable 1. A numerical value/unit separation section 7 separates the numerical value and unit code from the mixed digital signal; 7 inputs the separated numerical signal and displays it as a process measurement value on the 7-segment LED display section 2; A drive unit for displaying numerical values; 8 a unit display drive unit including a microcomputer for inputting separated unit codes and displaying units on the dot matrix display unit 3; 8a a unit display unit for displaying unit codes and unit names; This is a ROM serving as a storage unit in which a correspondence table is stored.

Note that the 7-segment LED display section 2 and the numerical display drive section 7 constitute numerical display means. Further, the dot matrix display section 3 and the unit display drive section 8 constitute a unit display means.

Next, the operation will be explained. The signal input cable 1 simultaneously inputs process measurement signals and unit codes from an intelligent sensor, a host controller, etc., which has the ability to transmit not only process measurement signals but also measurement units, parameters of the sensor itself, etc., to the digital indicator. At this time, the form of this input signal is 1-5VDC, 4-
If it is a system in which a unit code signal is mixed on an analog signal such as 20 mADC, it is digitally encoded through the A/D converter 5 and input to the numerical value/unit separator 6. Furthermore, if the signal format is a digital communication system from the beginning, such as optical digital transmission, the signal is directly input to the numerical value/unit separation section 6.

In the numerical value/unit separation section 6, the input digital signal is separated into a numerical value of a process measurement signal and a unit code by a built-in microcomputer. The separated numerical signals are displayed on the 7-segment LED display section 2 through the numerical display drive section 7. On the other hand, the separated unit codes are displayed on the dot matrix display section 3 through the unit display drive section 8. At this time, the unit display drive unit 8 has a ROM 8a that has a one-column table of correspondence between unit codes and unit names. Judge by. This will display the correct unit name.

Example 2. In the first embodiment, the dot matrix display section 3 is used as the unit display means, but a liquid crystal display may also be used. In addition, in the first embodiment, the numerical display means is a 7-segment LE.
D display section 2, dot matrix display section 3 as unit display means
However, the same effect can be obtained by using a dot matrix or liquid crystal display for all display means.

Example 3. Further, in the first embodiment, the dot matrix display section 3 is used for unit display, but if the unit code signal is changed to, for example, an alarm code signal or a message code signal, information on alarms and messages can be displayed respectively. Is possible.

[0015]

[Effects of the Invention] As described above, according to the present invention, a signal consisting of a measured numerical value and a unit code indicating its unit name is inputted, and from this input signal, the above numerical value and unit code are determined. is separated, the separated unit code and the corresponding unit name are found from the correspondence table, and the unit name and separated numerical value are displayed on each display means, so that the process measurement signal and the unit code can be separated. By inputting these at the same time, it is possible to display all measurement engineering units using one digital indicator.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a digital indicator according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of a digital indicator according to an embodiment of the present invention.

FIG. 3 is a perspective view of a conventional digital indicator.

FIG. 4 is a functional block diagram of a conventional digital indicator.

[Explanation of symbols]

2 7-segment LED display section (numerical display means) 3
Dot matrix display section (unit display means) 6 Numeric value/unit separation section 7 Numerical display drive section (numeric display means) 8 Unit display drive section (unit display means) 8a ROM (
memory)

Claims (1)

[Claims] [Claim 1] A numerical value/unit separator that separates the numerical value and unit code from an input signal including a measured numerical value and a unit code indicating the unit of the numerical value; A numeric display means for displaying numerical values, a storage unit storing a one-column table of correspondence between the unit codes and unit names, and a one-column table that stores the unit names indicated by the unit codes separated by the numerical value/unit separator. A digital indicator comprising unit display means for displaying the name of the unit determined from a table.