JPH10104024A - Process controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a process controller in which, when a data acquisition operation is stopped, the cause of its stop can be known by viewing a trend display by a method wherein the stop of the data acquisition operation is judged, the kind of the stop is discriminated and the trend display is performed. SOLUTION: When a data acquisition timing arrives, data from respective controllers 2-1 , 2-2 ,..., 2-n are acquired sequentially so as to be stored in a memory 12. Then, when a data acquisition operation is not stopped, an ordinary trend display is performed. When the stop of the data acquisition operation is judged, the kind of the stop of the data acquisition operation is discriminated. First, when a system is stopped as a whole, the blank period of data is divided by longitudinal lines so as to be displayed. When the system is not stopped but when a data acquisition part at an operator console 1 is stopped, the blank period of the data is partitioned by wavy lines so as to be displayed. When the data acquisition part is not stopped, whether the data can be acquired temporarily at a constant cycle or not is discriminated. When the data can be acquired, the blank period of the data is partitioned by two longitudinal solid lines so as to be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process control apparatus for monitoring and controlling a controlled object such as a plant via an operator console having two-dimensional display means such as a CRT and a liquid crystal display panel.

[0002]

2. Description of the Related Art In a process control apparatus for monitoring and controlling a controlled object such as a plant, an operator console is connected to a controlled terminal via a control line, and data from each of the controlled terminals is time-sequentially. And a trend display of a change in the data of each terminal on a CRT display. FIG. 7 shows an example of a trend display of a conventional process control device. In this type of process control device, when data collection is stopped for some reason, the trend display during that time is blank as shown in FIG.

[0003]

As described above, in the conventional process control device, when data collection is stopped, the period is blanked, and it can be seen that the data collection was stopped. However, it was not possible to know what caused data collection to stop. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a process control device that, when data collection is stopped, can see a trend display screen and know the reason for the stop. .

[0004]

A process control apparatus according to the present invention monitors and controls a controlled object via an operator console having two-dimensional display means, and displays collected data on the two-dimensional display means as a trend display. In what you do
A collection data stop determination unit for determining stop of the collected data; and a stop type determination unit for determining a type of the stop when the stop of the collection data is determined. Thus, the data stop display of the trend display of the two-dimensional display means is displayed in a different manner.

This process control device performs data collection after the data collection timing arrives, and determines whether or not the collection has been stopped. When the collection is stopped, the type of the data collection stop is further determined, and the fact is displayed on the trend display screen in a display mode corresponding to the type. The operator can see the trend display screen and know for what reason the data collection was stopped.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The light will be described in more detail. FIG. 1 shows one embodiment of the present invention.
Block diagram showing the system configuration of a portable process control device
It is. In this system, the plant to be controlled
Control device 2 which is a terminal device for controlling _-1, 2_-2, ..., 2
_-nConnected to operator console 1 via control line 3
Have been.

As shown in FIG. 2, the operator console 1 includes a CPU 11, a data memory 12, a program memory 13, an operation input unit 14, a CRT display 15, and an I / O circuit 16. However, these hardware configurations are not particularly new. In this embodiment process control device, each control device 2 _-1 ,
_2-2, ..., the data from the 2 _-n, under the control of the CPU 11, taken in through the control line 3, I / O16, while being sequentially stored in the data memory 12, the trend on the CRT display 15 Is displayed. If there is no particular stop in data collection, the trend display screen is the same as that shown in FIG.

Next, according to the flowchart shown in FIG.
A trend display operation at the time of data collection timing in the process control device of the above embodiment will be described. With the arrival of the data collection timing, each of the control devices 2 ₋₁ , 2
_-2 ,..., And collect data from 2- _n sequentially (step S
T1), the collected data is stored in the data memory 12 (step ST2). Next, it is determined whether the data is collected normally, that is, whether there is no stop in data collection (step ST3). If there is no stop in data collection, a normal trend display as shown in FIG. 7 is performed.

In step ST3, when it is determined that the data collection is stopped, the type of the data collection stop is determined in the subsequent processing. First, it is determined whether or not the entire system is stopped (step ST4). If the determination is YES, the display (a) shown in (a) of FIG. 4 is trend-displayed. In this case, the blank period of the data is partitioned and displayed by vertical wavy lines.
If it is determined in step ST4 that the system is not stopped, it is next determined whether the data collection unit, that is, the data input unit of the operator console 1 is stopped (step ST4).
5). If the determination is YES, the display (b) shown in FIG. In this case, the blank period of the data is partitioned and displayed by a broken line.

If it is determined in step ST5 that the data collection unit is not stopped, it is then determined whether data cannot be temporarily collected at a fixed period (step ST5).
6). If the determination is YES, the display (c) shown in FIG. 5 (c) is trend-displayed. In this case, the blank period of data is divided and displayed by two vertical solid lines. Step ST6
If it is temporarily determined that data cannot be collected at a fixed period of time (NO), then the terminal (each of the control devices 2 _-1 , 2 _-2 ,..., 2- _n )
Is determined (step ST7). If the determination is YES, the display (d) shown in FIG. 5D is trend-displayed. In this case, the blank period of data is divided and displayed by two vertical solid lines and an oblique line between them.

If the determination in step ST7 is NO, the data collection is stopped for another reason, and another display shown in FIG. 6E is performed. In this case, the data blank period is displayed so as to be continuous with a broken line on the actual trend display curve. In the above-described embodiment, as the reasons for stopping the data collection, the system was stopped, the data collection unit was stopped, collection was temporarily disabled at a fixed period, no signal was received from the control device, and the like. Is not limited to this, and various detailed reasons may be set in advance. Further, the mode of the trend display corresponding to the reason of the stop of the collected data is, for example, the stop of the system is shown in FIG.
It is needless to say that it is not necessary to stick to what is displayed in (1), and it is only necessary that the correspondence is clear, and it may be made to correspond to other display modes.

[0012]

According to the present invention, when data collection is stopped, a trend display in a different mode is performed in accordance with the reason for the stop.
The operator can easily identify the cause of the stoppage of data collection. Therefore, maintenance of the system becomes easier.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a process control device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a hardware configuration of an operator console of the process control device of the embodiment.

FIG. 3 is a flowchart for explaining a trend display operation at a data collection timing of the process control device of the embodiment.

FIG. 4 is a diagram showing an example of a trend display when data collection of the process control apparatus of the embodiment is stopped.

FIG. 5 is a diagram showing another example of the trend display when the data collection is stopped.

FIG. 6 is a diagram showing still another example of the trend display when the data collection is stopped.

FIG. 7 is a diagram showing an example of a normal trend display in the process control device.

FIG. 8 is a diagram showing a display example of a trend display when data collection of a conventional process control device is stopped.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Operator console 2 _-1 , 2 _-2 , ..., 2- _n control device 3 Control line 11 CPU 12 Data memory 15 CRT display

Claims (1)

[Claims] 1. A process control apparatus for monitoring and controlling an object to be controlled via an operator console having two-dimensional display means and displaying collected data in a trend on said two-dimensional display means, wherein a stop of the collected data is determined. And a stop type determining means for determining the type of the stop when the stop of the collected data is determined, and when the collected data is stopped, the two-dimensional display means according to the stop type. Wherein the data stop display of the trend display is displayed in a different manner.