JPH01161996A - Process controller - Google Patents

Abstract

PURPOSE:To properly regulate process variable even if a delay time due to transmission in a signal transmission line is caused by displaying a process variable, a setting value and an object value on a screen of a display device. CONSTITUTION:An object value CV, a setting value SV and a process variable PV are displayed on a CRT display device 4. Thus, the object value CV from a process computer 1 to a controller 2 is not through a signal transmission line 12, then the value is changed quickly. Then the setting value SV from the controller 2 inputted via the signal transmission line 12 is changed and the process variable PV inputted from a system including the time constant of a plant is changed finally. Thus, the operator notifies the object value CV and applies operation so as to be approached to the object regulating variable 4c and the operation is stopped when the object regulation variable 4c and the object value CV are coincident, then proper adjustment is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a process control device in which a target value is provided from a process computer to a controller via a signal transmission line.

[Conventional technology]

CRT display devices are widely used as process monitoring devices when operating nuclear couplants.

The CRT display device displays on the screen information related to the process amount given from the process computer. The process computer calculates a target value in response to an operation command from an input device such as a keyboard, and provides the calculated target value to the controller. Recently, it has become common practice for an operator to give an operation command by displaying an operator graphic on a CRT display and touching it.

The controller controls the process amount by giving the process a set value that sets the process operation amount to the target value.

When a CRT display device is used to monitor a process in this way, the set value output by the controller and the process amount taken in from the process are displayed on the CRT screen. This is described in Japanese Patent Application Laid-Open No. 60-54018. When displayed on the CRT display device in this manner, the operator can operate until the target operation amount is reached while checking the analog or digitally displayed set value.

[Problem that the invention seeks to solve]

When performing such process control, it has been considered to provide target values from a process computer to a large number of controllers via signal transmission lines. In this case, the process computer receives the operation command and periodically sends the target process operation amount (target value) to the controller. When a controller feeds back setting values for controlling a process and displays them on a CRT display, there is a time delay due to the signal transmission line. Therefore, if the set value is adjusted to the target adjustment amount as in the prior art, the target value from the process computer will exceed the target adjustment amount and will be sent to the controller. the result.

There is a problem in that the process amount is controlled in excess of the target adjustment amount.

SUMMARY OF THE INVENTION An object of the present invention is to provide a process control device that can accurately adjust a process amount even if a delay time occurs due to transmission in a signal transmission line.

[Means for solving problems]

The above purpose is to display the target value that the process computer sends to the controller in response to an operation command, the set value for the controller to control the process upon receiving the target value, and the process value input from the plant on the screen of the CRT display device. This is achieved by displaying the

[Effect]

By adjusting the process while checking the target value sent from the process computer to the controller, the set value of the controller comes to match the target value after including the delay time caused by the signal transmission line.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. 2.

In FIGS. 1 and 2, the process computer 1 is the transmission device 11
Input the process amount information of process 3 from 11A and press CR
A display signal is given to the T control device 9.

The CRT control device performs display on the CR7 display device 4.

On the screen of the CR7 display device 4, information related to the operating device shapes 4a, 4b and the process amount is displayed. A touch screen (pressure-sensitive position detection device) 8 using a transparent conductive film is arranged on the screen of the CR7 display device 4. The touch screen control device 10 detects the pressure on the touch screen 8 as an electric signal, converts this into a digital signal, and provides the X-axis and Y-axis positions to the process computer 1.

The touch screen control device 10 sends an interrupt signal to the process computer 1 at the same timing as the position coordinates, and this interrupt signal is sent periodically while the operator is touching the touch screen. Touch screen control device 10
Since the operation is well known, detailed explanation will be omitted. When the process computer 1 receives an operation command (increase or decrease based on position coordinates), it adds or subtracts a predetermined α amount to the current set value Sv in accordance with the interrupt timing from the touch screen control device 10. This is set as the target value C■ and sent to the data transmission memory M in the transmission device 11A of 7.
Set to AL. Also, the process computer 1 has a target value C
V is sent to the CRT control device 9 as a display signal and displayed on the screen of the CR7 display device 4. Transmission bag [11A, II
B is a data transmission memory MAL, MB as shown in FIG.
I and data receiving memory MA2. Has MB2. The transmission bags [11A and 11B are connected via a signal transmission line 12. The transmission devices 1fllB are provided according to the number of controllers 2. Controller 2 is data receiving memory M
The target value Cv is taken from B2 and the set value Sv is determined and sent to the process 3 via the process input/output device 13. The controller 2 performs scale conversion to match the scale of the process 3 and sets the set value Sv. Note that the controller 2 executes P control, PI control, or PID control.

The process amount Pv and set value Sv of process 3 are transmission device 1
The transmission device 1 is set in the 1B data transmission memory MBI.
It is taken into the process computer 1 via 1A. The process computer 1 periodically takes in the process amount Pv and the set value Sv and sends them to the CRT control device @9 as a display signal to be displayed on the CR7 display device 4.

Next, the operation of the process control device configured as described above will be explained.

Assume that the process value Pv, set value Sv, and target value Cv are now displayed on the screen of the CRT display device 4 as shown in FIG. Suppose that the operator presses the "increase" part of the controller figure in this state. This operation command is sent to the process computer 1 as position coordinates by the touch screen control device 10. Process calculator 1
determines the operation command based on the X and Y coordinates, determines that this time it is an increase command, and first sends a control start command to the controller 2. When the process computer 1 receives a response from the controller 2 indicating that it has received the command normally, the process computer 1 sends the target value CV, which is the predetermined value α added to the current set value SV, to the transmission device 11 in response to an interrupt signal from the touch screen control device 10. is set in the data transmission memory MAL of , and is set in the data reception memory MB2 of the transmission device 11B via the signal transmission circuit 12.

On the other hand, the target value CV is displayed on the CRT display device 4 via the CRT control device 9. This target value Cv is displayed on the CRT display device 4 as a numerical value (digital value) 7 and a graphical display (analog value) 7' as shown in FIG. Target value Cv
increases to the analog value 7' as shown by the dashed line.

On the other hand, the controller 2 takes in the target value from the -F reception memory MB2 of the transmission bag 11B, sets a scale set value Sv suitable for the process, and supplies it to the process 3 via the process input/output device 13 for control. Further, the controller 2 transfers the set value Sv to the data transmission memory MBI of the data transmission bag [11B] and processes calculation 4I! Send to 1.

This operation is repeated at regular intervals. controller 2
inputs the process amount of process 3 in synchronization unrelated to the calculation of the set value Sv, and sends the data transmission bag [1] as the process value Pv.
The data is transferred to the 1B data transmission memory MB1 and sent to the process computer 1. Process computer 1 is data transmission bag r11
The set value Sv and process value Pv from the controller 2 are periodically read into the data receiving memory MAI in the data receiving memory MAI 11A, and a display signal is sent to the CRT control device 9 to display the digital values 5, 6 and the par chart display 5 on the CRT display device 4.
', 6' are changed as shown by the broken line.

Incidentally, when the operating device figure 4b is pressed, the value in the decreasing direction is displayed on the CRT display device 4 by the same process.

In this way, the target value Cv, set value Sv, and process value Pv are displayed on the CRT display device 4, but since the target value CV from the process computer 1 to the controller 2 does not go through the signal transmission line 12, Change. Thereafter, the set value Sv input from the controller 2 via the signal transmission line 12 changes, and finally the process value Pv input from the system including the plant time constant changes. Therefore, the operator can perform an appropriate adjustment by paying attention to the target value Cv, performing an operation to bring it closer to the target adjustment amount 4C, and stopping the operation when the target adjustment amount 4c and the target value C■ match.

As described above, according to the present invention, even in a process control device in which a controller is connected to a signal transmission line using a data transmission device, the manipulated variable can be adjusted accurately.

〔Effect of the invention〕

As described above, according to the present invention, even when a target value is sent from a process computer via a signal transmission line, the process manipulated variable can be determined appropriately.

In the above-described embodiment, the operation command is given to the process computer by pressing the operating device figure displayed on the CRT display device, but the operation command may be given using other input devices such as a keyboard. Of course.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a schematic block diagram of the present invention, Fig. 3 is a detailed block diagram of a transmission device, and Fig. 4 is a block diagram showing an embodiment of the present invention.
The figure is an example of a CRT screen display. 1... Process calculator, 2... Controller, 3
...Process, 4...CRT display device, 5...Process value, 6...Set value, 7...Target value, 8...
Touch screen, 9...CRT control device, 10...
- The touch screen control bag includes 11...data transmission device, 12...signal transmission line.

Claims (1)

[Claims] 1. A process calculator that calculates a target value according to input operation commands and provides it to the controller via a signal transmission line;
a controller that provides a set value to the process for setting a process operation amount of the process based on the target value; a display device that displays information related to the process amount; and a controller that receives information from the process computer and controls the display of the display device. 1. A process control device comprising: a display control device, wherein the process amount, set value, and target value are displayed on a screen of the display device.