JPS62245302A - Plant monitor and control equipment - Google Patents

Abstract

PURPOSE:To perform a plant control in a transient state, by storing process data at a rapid change time using a trend display screen on a CRT display device. CONSTITUTION:A plant supervisory controller which performs the expected control of a plant is constituted by utilizing the display screen on a CRT display device 9 connected to a computer 8. The computer 8 is constituted of a central processing part 22, etc., and sends out rain-fall data, etc., inputted from a weather device 25 from a transmission part 24 to a microcontroller 2 through a transmission line 7. At such a time, the process values of a water level and a rain-fall is stored from the trend display screen of the CRT display device 9 at a storing part 21, and those process values are arranged by every change pattern, then being stored at the controller 2. In this way, the controller 2 checks received rain-fall data with stored change patterns, and controls the number of operating pumps, and their speed at levels fitted for a forecasted water level through a sequence controller 3, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a plant monitoring and control device comprising an electronic computer and a CRT display device.

(Prior Art) Conventionally, this type of plant monitoring and control device monitors the plant status using a CRT display device connected to an electronic computer.
It was common to display process data and operate equipment using a keyboard or light pen. Therefore, until now, the trend screen display of CRT display devices has only been able to display process data input into a computer on a graph. If a process value suddenly changes, the process value is input to the microcontroller by a detector. The microcontroller outputs a plant operation signal to the sequence controller and speed increase and deceleration signals to the speed control device according to the amount of change in the input process value.

(Problem that the invention attempts to solve) With conventional equipment, when the process value suddenly changes.

The responsiveness of plant control is limited by the response speed of the detector and the delay time of the control cycle of the microcontroller.
The drawback was that effective control could not be performed in plants that required quick response.

The present invention eliminates the above drawbacks and provides a plant monitoring and control device that performs predictive control of a plant using a trend display screen of a CRT display device connected to a computer.6 [Structure of the Invention] (Problems Means for Solving the Problems) The present invention provides a plant characterized in that, for plant monitoring and control, times of sudden changes in process data are arbitrarily stored using a trend display screen of a CRT display device connected to an electronic computer. It is a monitoring control device.

(Operation) The plant monitoring and control device of the present invention performs predictive control of a plant using a trend display screen of a CRT display device connected to a computer.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a plant monitoring and control device showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of a trend display screen of a CRT display device. On the display screen, 11 is Y
The axis process amount, 12 indicates the X-axis holding time, 13 indicates a change in process value, and 14.15 indicates a cursor that moves arbitrarily on the display screen.

8 in FIG. 1 is a block diagram showing an electronic computer.

In this block diagram, 21 is a storage unit that stores data, 22 is a central processing unit that performs all arithmetic control, and 23 is a C
An input/output control section 24 performs input/output with the RT display device, and a transmission section 24 performs transmission input/output processing with each station.

On the trend display screen of the CRT display device 9.

Water level and rainfall data are taken as Y-axis process quantity 11, and here the changes from 9 o'clock to 10 o'clock are displayed. Here, the graph of the process value 13 of the water level that showed a sudden change with respect to the sudden change of the process value 13 of the rainfall is set with the cursor 14 at time 9:05 of the X-axis interval 12 and the cursor 15 at time 9:35, By performing a memory operation using the keyboard of the CRT display device 9, the process values 13 of water level and rainfall between time 9:05 and time 9:35 are transmitted via the input/output control unit 23 and central processing unit 22 shown in FIG. It is stored in the storage unit 21.

In response to such a sudden change in the process value 13, the cursor 14.
15 to the memory range using the light pen 10.

Each time a similar situation occurs, it is stored in the storage unit 21 of the computer.

The central processing unit 22 organizes the suddenly changed process values 13 stored in the storage unit 21 according to change patterns, and sends them to the transmission station 6 and the data transmission line 7 via the transmission unit 24 using free time during the processing cycle. , and transmits the change pattern of rainfall and water level to the microcontroller 2 via the transmission station 6.

The microcontroller 2 stores the change pattern transmitted from the central processing unit 22. After that, rainfall data is input from the meteorological device 25 to the computer 8, and the process value 13 is stored in the microcontroller 2 in the same way as the transmission path of the change pattern. Transmit to controller 2. The microcontroller 2 checks whether there is a pattern corresponding to the change in the transmitted process value 13 with the stored change pattern, and if there is a matching pattern, the sequence controller 3
And the speed control device 4 is controlled to the number and speed of pumps in operation that match the predicted water level.

〔Effect of the invention〕

As described above, according to the present invention, the CRT connected to the computer
By using the trend display screen of the display device to store process value change patterns in a microcontroller that directly executes process control, plant control in transient states of the process can be performed smoothly.

Furthermore, since the change patterns are organized in the central processing section and then stored in the microcontroller, the burden on the microcontroller is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a plant monitoring and control device showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a trend display of a CRT display device. 2...Microcontroller, 8...Electronic computer 9
... CRT display device, 13... Process value 22...
・Central Processing Department Agent Patent Attorney Nori Chika Ken Yudo Hirofumi Mitsumata Figure 1 Figure 2

Claims (1)

[Claims] An electronic computer that arbitrarily stores sudden changes in process data, and a CRT that is connected to this computer and displays trends.
A plant monitoring and control device comprising: a display device; a transmission station connected to the electronic computer to transmit data; and a microcontroller connected to the transmission station via a data transmission line.