JPS61138118A - Method and device for displaying bar graph - Google Patents

Abstract

PURPOSE:To enable the process monitoring of good efficiency by displaying the section between the upper limit value and lower limit value of a process by the bar graph in the length equivalent thereto and by displaying the position equivalent to the current state quantity with high luminance. CONSTITUTION:The display is performed by the bar graph in the length in proportion to the value of the state quantity PV in a PV mode in case of displaying by bar graph the current certain state quantity PV of the process. The section between the upper limit value PH and lower limit value PL is displayed by the bar graph in the length equivalent thereto in the mode (PH/PL mode) to display the allowable range of the state quantity and the section between the current state quantity PV and the value substracting the prescribed X therefrom is displayed with high luminance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a bar graph display method and display device, and particularly to a bar graph display method and display device used in an indicator/alarm meter in process instrumentation.

[Technical background of the invention]

The bar graph display is widely used for process monitoring because the display W can be visually understood. When a current state quantity PV of a process is displayed as a bar graph, it is generally displayed as a bar graph with a length proportional to the value of PV, as shown in FIG. 4(a). However, for process monitoring, it may be necessary to display a bar graph of the state quantity tolerance range sandwiched between the lower limit value PH and the lower limit +a pL. Therefore, in the past, a mode for displaying this tolerance range (hereinafter referred to as PH/PL mode) was provided separately from a normal mode (hereinafter referred to as PV mode), so that a display as shown in FIG. 4(b) could be performed.

That is, if you want to display the current state quantity, use the PV mode as shown in Figure 4 (a), and if you want to display the allowable range, use the P l-(/PL mode) as shown in Figure 4 (1)). It was designed so that the mode could be switched as shown below.

[Problems with background technology]

However, with this method of switching modes and displaying them separately, it is not possible to see the allowable range in the PV mode, and the PV value cannot be seen in the P auto/p mode. For this reason, there was a drawback that efficient process monitoring was not possible.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bar graph display method and a display device that can simultaneously display the lower limit value and the current value of a state quantity and perform efficient process monitoring.

[Summary of the invention]

The feature of the present invention is that when displaying a bar graph in the Pl-(/PL mode), the upper limit 1 direct PH and the lower limit tI
The section between iIpL and iIpL is displayed as a bar graph of the corresponding length, and the position corresponding to the current state quantity PV is displayed at a height of 14 degrees, allowing efficient process monitoring. be.

[Embodiments of the invention]

The present invention will be described below based on illustrated embodiments. FIG. 1 is an explanatory diagram showing a bar graph display method according to the present invention. FIG. 5(a) shows the display in the PV mode, which is completely the same as the conventional one. Figure (b) shows the display in the PH/PL mode, and if the section between the lower limit Pl-1 and the lower limit IUPL is displayed as a bar graph of the corresponding length as in the past, The interval between the current state Bi PV and PV-X (hereinafter explained assuming that X = 1) obtained by subtracting a predetermined value X from the current state Bi PV is displayed as a bar graph with a corresponding length. Therefore, the brightness of the overlapping diagonal areas in the figure naturally doubles, resulting in a high-brightness display.

FIG. 5 is a block diagram of a bar graph display device according to the present invention. CPU i operates according to the program in ROM2, using RAM3 as a memory area.

That is, each state quantity input from the process is stored in the HIGH1 register 5. It is stored in four registers: LOWI register 6, HIGI-12 register 7, and LOW2 register 8. This procedure will be explained with reference to the flowchart in FIG. 6 (2x).

First, in step S1, it is determined whether the mode is Pl-1/PL mode. In case of pH/P L mode, step S
2, HI G l-11 register has PV, LOW
I register pv-x (°Here, X=1>, Hl
G H2 register has PH, LOW2 register has P
Each L is memorized. On the other hand, if it is not the PH/PL mode, that is, if it is the PV mode, in step S3, the H
I G )-11 register stores pv and sets the values of the other three registers to zero.

Display control circuit 9 and bar graph display device 10 in FIG.
displays a bar graph based on the contents of these registers. [! J'5, HI G The interval between the hani of H1 register 5 and l11 of OW1 register 6 is displayed as a bar graph of the corresponding length, and 1-11
The interval between the 1 shift of the GH2 register 7 and the value of the LOW2 register 8 is displayed as a bar graph of a length corresponding to this interval. By performing such processing, the image shown in Fig. 1 (a) in the PV mode and the image shown in Fig. 1 (b) in the PH/PL mode can be obtained.
The following display will be displayed. Note that if the display method described below is adopted, the following inconveniences may occur. For example, when P V = P H +1, the two bar graphs touch each other without overlapping each other, as shown in Figure 2 (a), so visually one bar represents one pattern. -Recognized as a graph.

Furthermore, PV=Pl-DONATATOKIMO, as shown in FIG. 2(b), is visually recognized as one bar graph. In order to avoid such inconvenience, the process shown in FIG. 6(b) is performed in step S5 of FIG. 6(a). Hit me, Step 86...PV...
Determine whether it is PL, and if Pv=Pl, step S
7, set the 1st shift of the HIGH1 register to l)V' instead of PV.
Increase to +1.

As a result, the bar graph display is changed to 911F as shown in FIG. 2(b) to FIG. 3(b), and the PV is displayed with high brightness. Also, in step S8, PV=p;-1+
1 or not, and in the case of PV-PH+1, set the value of the LOW1 register as PV, -
Exposure to PV-2 rather than PV-1. As a result, the bar graph display is modified as shown in FIG. 2 (a) to FIG. 3 (a), and the PV value is displayed with high brightness.

〔Effect of the invention〕

As described above, according to the present invention, when displaying a pull bar graph in P H/PL mode, KL Fi corresponding to the current state mPV is displayed at 1 effi brightness, so that the state quantity is By simultaneously displaying the upper F limit 11 and the current value, efficient process monitoring can be performed.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of a bar graph display according to the present invention, FIG. 4 is an explanatory diagram of a conventional bar graph display, and FIG. 5 is a block diagram of a bar graph display device according to the present invention. 6
The figure is a flowchart showing a process for displaying a bar graph according to the present invention. 1... CPU, 2... ROM
, 3... 1) △M, 5...
IG H1 register, 6...1. -OW 1
Register, 7...HIGH2 register, 8...lOW
'2 register, 9...Display 1till II circuit, 1
0... - Bar graph display measurement Applicant Kiyoshi Inomata Figure 1 (α) (b) Figure 2 (α) (b) Figure 3 (α) (b) Figure 4 Figure 5

Claims (1)

[Claims] 1. A bar graph display method for displaying the state of a process in a bar graph, the interval between an upper limit value and a lower limit value of the process being represented by a bar graph of a corresponding length. 1. A bar graph display method characterized by displaying a position corresponding to a current state quantity with high brightness. 2. A bar graph display device that displays the state of the process as a bar graph, with HIGH1 and LO for storing each state quantity of the process.
Four registers, W1, HIGH2, and LOW2, the current state quantity PV of the process is stored in the HIGH1 register, the value PV-X obtained by subtracting a predetermined value X from the state quantity PV is stored in the LOW1 register, and the value PV-X obtained by subtracting a predetermined value A CPU that stores the upper limit value PH of the process and the lower limit value PL of the process in the LOW2 register, respectively, and stores the value of the HIGH1 register and the LOW1 register.
The interval corresponding to the value of the register is displayed as a first bar graph, and at the same time, the interval corresponding to the value of the HIGH2 register and the value of the LOW2 register is displayed as a second bar graph. A bar graph display device comprising: a bar graph display control device that displays a bar graph superimposed on a first bar graph;