JP2904938B2 - Screen display time measurement device for man-machine interface device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen display time measuring device for a man-machine interface device used for an industrial process monitoring device or the like.

[0002]

2. Description of the Related Art Conventionally, in a man-machine interface device used for an industrial process monitoring device or the like, when monitoring a change in a process on a screen, a plurality of screens are sequentially cut with a display time longer than a necessary minimum. The display screen was managed so as to be replaced. For that purpose, it is necessary to measure the display time of each displayed screen and to allocate the display time in detail for each screen. Therefore, conventionally, when measuring the display time of the screen, the operator simply measures using a stopwatch while looking at the screen, or connects the display time measurement device to the man-machine interface device and measures it. Was.

FIG. 5 is an explanatory diagram showing the former conventional example. The man-machine interface device 1 includes a keyboard 2 as input means, a control unit 3, and a CRT 4. When the function key of the keyboard 2 is depressed, processing for displaying the image 5 on the CRT 4 is started. At the same time when the function key is pressed, the operator starts a stopwatch to start measurement. Next, when the display time elapses and the display disappears, the stopwatch is stopped and the elapsed time is read. Thus, the screen display time on the CRT 4 is measured.

FIG. 6 is an explanatory view showing the latter conventional example. The man-machine interface device 1 includes a keyboard 2 as input means, a control unit 3, and a CRT 4. The control unit 3 includes a CPU 6 and a register 7, and an input reception program 9 and a screen display program 11 are built in the CPU 6 as firmware 8. When a function key for designating screen display on the keyboard 2 is pressed, a process for displaying the image 5 on the CRT 4 is started by interruption. "1" is output to the register 7 when the screen display key is input, and returns to "0" when the display is completed. An external logic analyzer 12 is connected to the register 7 so that a change in the output value of the register 7 can be monitored. Here, the logic analyzer 12
The time chart shown in FIG. 7 is displayed. Then, the period of “1” in the figure is the display time to be obtained.

[0005]

However, of the above-mentioned conventional measuring methods, the former involves the operation of the stopwatch while pressing the function key and visually checking the screen display. There is a problem that measurement cannot be performed. In the latter case, although accurate measurement can be performed, the logic analyzer 12 must be provided externally, and there are problems such as an increase in cost and securing of space.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to accurately measure the operation time of a screen display without externally attaching a measuring instrument such as a logic analyzer 11 or the like. An object of the present invention is to provide a screen display time measuring device for a man-machine interface device.

[0007]

To achieve the above object, the present invention provides a display, a key input, an internal timer, a memory, and an output for starting a display operation of the display from the key input. Means for reading the value of the internal timer in the memory when there is an error, means for reading the value of the internal timer in the memory when the display operation of the display means ends, and at the start and end of the display operation of the display means Means for reading out from the memory and calculating the difference to set the difference as a screen display time.

[0008]

In the present invention, when there is an output from the key input means for starting the display operation of the display means, the value of the internal timer is read and stored in the memory. When the display operation of the display means is completed, the value of the internal timer is read and stored in the memory. Next, the start time and the end time of the display operation of the display means are read out from the memory, the difference is calculated, and the screen display time is automatically obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In the figure, a man-machine interface device 1 includes a keyboard 2 as input means, a control unit 3, and a CRT 4 as display means.
Consists of The control unit 3 includes a CPU 6, a timer 13, and a memory 14, and includes an input receiving program 9 and a screen display program 11 as firmware 8 in the CPU 6. The timer 13 includes a cyclically operated down counter, and can always read a count value. The memory 14 stores the count value of the timer 13 sent from the CPU 6.

FIG. 2 is a flowchart showing the operation of the embodiment shown in FIG. Hereinafter, the operation of the present embodiment will be described based on this flowchart. When there is a key input for starting the display from the keyboard 2, the input receiving program 9
Is activated, and the key reception process is started by the interruption.
In this process, the count value C of the timer 13
0 is read and set in the memory 14 (step 20).
1) Simultaneously activate the display task (step 20)
2). Next, the screen display program 1 which is a display task
1 is started, and the count value C1 of the timer 13 at that time, that is, the display start time, is read and set in the memory 14 (step 203). At the same time, the screen display processing is started to display the image 5 on the CRT 4 (step 2).
04). Next, when the predetermined display processing is completed, the count value C2 of the timer 13 at that time, that is, the display end time, is read and set in the memory 14 (step 205), and the processing ends. Thereafter, although not shown, the count values C0 to C2 set in the memory 14 are called, and the difference between them is calculated, thereby obtaining the time required for each processing step.

FIG. 3 is a graph showing a change in the count value of the down counter in the timer 13. The counter is 16
It is composed of bits, and is sequentially decremented at an update cycle of 0.1 ms from the maximum value “FFFF”. When the value is decremented to the minimum value “0000”, the next value becomes the maximum value “FFFF”, and the count value is cyclically updated. In the figure, the count value C0 at the time of key input is "9000", and the count value C1 at the start of display is "7".
000 ", and the count value C2 at the end of the display is set to" 100 ".
0 ".

FIG. 4 is a time chart showing the relationship between the processing operation and the count value in the timer 13 on a time axis. Assuming that the count value in the figure is in decimal system for convenience of explanation, the count value is 200 from the time of key input (C0 = 9000).
The actual screen display starts at the point of time when ms has elapsed (C1 = 7000). Further, at the end of the screen display (C2 = 10
By 00), 600 ms elapse. That is, the entire processing time required for screen display is 800 ms.

As described above, in the embodiment, when a process for displaying a screen is performed, the elapsed time is read from the timer 13 at each time of a key input for designating the start of each operation and at the end of each operation, and is stored in the memory. 14 is stored. Therefore, by reading the corresponding count value from the memory 14 for each screen display process and calculating the difference, the processing time can be obtained simply and accurately. Therefore, time management of the image 5 displayed on the CRT 4 of the man-machine interface device 1 is facilitated. Moreover, since these processes are performed in the man-machine interface device 1, there is no need to connect another measuring device to the outside.

[0014]

As described above, according to the present invention, when there is an output from the key input means for starting the display operation by the display means, the value of the internal timer is read and stored in the memory. When the display operation of the display means is completed, the value of the internal timer is read and stored in the memory. Next, the start time and the end time of the display operation of the display means are read out from the memory, and the difference is calculated to be the operation time of the screen display. Therefore, it is not necessary to attach a measuring instrument such as a logic analyzer externally as in the related art, and the screen display time can be easily and accurately measured.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an embodiment.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is a graph showing a change in a count value of a timer.

FIG. 4 is a time chart showing a relationship between a processing operation and a count value of a timer.

FIG. 5 is an explanatory diagram showing a first conventional example.

FIG. 6 is an explanatory diagram showing a second conventional example.

FIG. 7 is a time chart showing the operation of the second conventional example.

Claims (1)

(57) [Claims] 1. A display means, a key input means, an internal timer, a memory, and a means for reading the value of the internal timer when there is an output from the key input means to start the display operation of the display means, and storing the value in the memory. Means for reading the value of the internal timer at the time when the display operation of the display means is completed and storing the read value in the memory, and means for reading the start time and the end time of the display operation of the display means from the memory and calculating the difference to obtain the screen display time A screen display time measuring device for a man-machine interface device, comprising: