JPH03177193A - Digital control monitor system - Google Patents

Abstract

PURPOSE:To relieve the load factor of a CPU at the side of a CRT controller by allowing the CRT controller and each controller to share efficiently a CRT screen display program. CONSTITUTION:A CRT screen display program is shared by a CRT controller 10 and subsequent controllers 301, 302,.... Thus, increase in the memory capacity of the CRT controller 10 is suppressed and the proper share of the software quantity for the entire system is attained smoothly. Then the program displayed on a CRT 18 at present is executed at fast speed in matching with a substantial control period and other programs are executed for a sufficiently longer period. Thus, the increase in the load factor of the subsequent controllers 301, 302,... with respect to the CPU 32 is suppressed and new display onto the CRT screen is attained without a sense of disorder.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is directed to a local area network (hereinafter referred to as LAN).
It is related to digital control monitoring systems used in distributed instrumentation and control systems where multiple process control devices are distributed over a computer (abbreviated as ”), and in particular, information handled by multiple control devices is centrally processed and the processed information is This invention relates to a digital control and monitoring system that is effective when controlling and monitoring by displaying on a CRT.

(Prior Art) In general, this type of control and monitoring system executes digital processing for application to the process detection/operating end 1, as shown in FIG. 3, and also performs processing necessary for control/monitoring. A plurality of digital process control devices 2, 2 . . . . and each process control device 2, 2 . . . . and each process control device 2, 2.
．． ...CRT controller 3 that receives color information, runs a double-sided display program, and converts it into double-sided display information.
and these devices i2, 2. . . , and a LAN 4 that transmits information between the three, a so-called distributed instrumentation control system is constructed. Reference numeral 5 denotes a CRT device that functions as a point of contact (human machine interface) between the operator and each piece of information.

By the way, in recent control and monitoring systems, as plants become larger and more complex, the amount of information that must be displayed on CRT devices has tended to increase, and with the development of LAN technology, process control devices 2.2 ．． It has become possible to install ... over a wide area, but the programs that process information are owned based on the division of roles of each component. That is, each control device 2, etc. distributed on the LANJ owns programs related to process control, while the CRT controller 3 centrally stores programs related to screen display and operation (- r
I'm L.

(To be solved by the invention: Rm) Therefore, in the above system, due to the increase in the amount of information and the centralization of operations, the CRT device 5
The amount of data processing and programming required for display and manipulation has become extremely large. In other words, the CRT controller 3 not only displays many types of screens on the CRT device 5, but also combines various signals to make it easier for the operator to see when displaying the screen, such as "screen color change" and "flicker display". , each has its own program to perform "screen expansion" and the like.

As a result, the load factor of the CPU of the CRT controller 3 increases, the display speed decreases, and insufficient memory capacity becomes a major problem. Therefore, each process control device 2.
It is possible to store some of the programs necessary for CRT display and operation on the side, but the CPU on the process control device 2 side is directly involved in controlling the most important process, so it may reduce the processing capacity. , in other words, it leads to a decrease in the control cycle, etc., so the process control device! The increase in the amount of programs on the second side must be suppressed as much as possible. Ultimately, there are many problems with the storage locations for the ever-increasing number of screen display and operation programs, and there is an urgent need to solve these problems.

The present invention was made in view of the above five problems, and by efficiently distributing and storing CRT screen display programs, CR can be achieved without increasing the load factor of the CPU on each control device side.
The purpose of this invention is to provide a digital control and monitoring system that reduces the load factor of CPυ on the T controller side.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides a plurality of $! l device and CRT controller are in LA
N, the CRT controller executes a CRT screen display program using information from the control device or keyboard, and displays information on the program execution result on the CRT device for control and monitoring. In the control monitoring system, the CRT controller includes a program selection means for selecting a plurality of types of CRT screen display programs, and when a specific CRT screen display program is selected by the program selection means;
program selection information sending means for outputting information indicating that the specific CRT screen display program has been selected;
Each of the control devices stores a part of the CRT screen display program in a distributed location H, and transmits it from the CRT controller to a LAN.
Executes the applicable CRT double-sided display program that it owns based on the program selection information sent via the
For other CRT screen display programs, the program processing means is configured to be executed at a predetermined long cycle.

(Function) Therefore, the present invention takes the above measures, so that when a specific CRT screen display program is selected by the program selection means on the CRT controller side, the CRT screen display program is simultaneously executed. The program selection information sending means sends the program selection information to LA.
It is sent to the lower control device via N.

In each F-level control device, the corresponding CRT is selected based on the program selection information sent from the CRT controller side.
I! ! ! It is determined whether the i-screen display program is owned or not, and if there is a corresponding CRT screen display program, the corresponding CRT screen display program is executed at the normal control cycle or faster.
A screen display program is executed, and information on program execution results is sequentially sent to the CRT controller side. Therefore,
On the CRT controller side, information for CRT display is processed based on the latest program execution result information from the relevant control device. On the other hand, if the control device does not have a corresponding CRT screen display program based on the program selection information, it executes its own program at a cycle sufficiently longer than the control cycle to always update the information to the latest information.
The CRT controller and the control device reliably execute their respective roles while distributing and owning the CRT screen display program.

(Embodiments) Before describing embodiments of the present invention with reference to the drawings, the process of realizing the apparatus of the present invention will be described below. Generally, a CRT controller has a number of screen display programs corresponding to the types of display surfaces that can be displayed on each CRT device, but these screen display programs are divided into the CRT controller side and each process control device side. If you own the CRT controller, at least the load factor of the CPU on the CRT controller side will be reduced. However, as described above, each process control device is a part directly involved in controlling the most important process, and this may lead to a reduction in processing capacity, that is, a reduction in the control cycle, etc. However, when executing the double-sided display program, each process control device has a CR.
There is no particular problem if the information is the latest input/output information of the own detection terminal and operation terminal and the calculation results related to the display on the T device, and the load factor of the CPU on the control device side can be reduced by accelerating the operation cycle. It will not increase.

Also, since one CRT device normally displays the execution results of one screen display program, there is no need to run the screen display program that is not displayed on the CRT device, but the screen display If the screen display program is completely stopped, the next time you switch to a new screen display program, it may be mistaken as if the process status has suddenly changed. Therefore, in the process control device, the program is executed by changing the operating cycle as shown in FIG. 3, which will be described later, so as not to cause any trouble to the CRT controller.

Next, a one-shot embodiment of the apparatus of the present invention will be described using the hardware configuration shown in FIG. In the figure, the CRT controller 10 side includes a keyboard 11 and a key input circuit 12 that provide screen selection signals, and a plurality of CRT screen display programs 131a, 132a, -, corresponding to the type of display screen.
, a screen display memory 13 having 13Na, receives a screen selection signal from the main program stored in the keyboard 11 or the memory 14, and selects a plurality of types of CRTj.
Fi screen display programs 131a and 132a.

. . . A program selection means comprising a CPU 15 or the like is provided which reads a specific CRT screen display program from among the 13Na and processes it.

Furthermore, upon receiving the screen selection signal, the CPU 15 sends information indicating that a specific CRT screen display program has been selected to the LAN 20 via the transmission control section 16. In other words,
The CPU 15 and the transmission control unit 16 constitute a program selection information sending means, and the program selection information is transmitted to each process control device 301, 302. Send to...

Note that 17 is a CRT control circuit, and 18 is a CRT display section.

On the other hand, each process control device 301, 302 . In addition to the transmission control unit 31 and the CPU 32, . . . divides a part of the plurality of CRT screen display programs 131a, 132a, .
・, 33+ memory owning 13Nb, 332
, . . . and at least a process detector 4
An A/D converter 34 converts the signal from 1 into digital data, a D/At converter 35 converts the digital operation signal to the operating device 42 into an analog signal, a human output interface 36, and the like are provided. Note that each process control device 30+, 302. . . . are provided with CRT screen display programs 131b, 132b, .

Next, the operation of the apparatus configured as above will be explained.

Now, the operator is using the CRT screen display program 131a.
When a screen selection signal for displaying is input manually from the keyboard 11, the CPU 15 selects a CRT screen display program 131 from its own memory 13 based on the screen selection signal.
a, execute program processing, and then read CRT
Information indicating that the double-sided display program 131a is selected is displayed in L.
Transmit to AN20.

At this time, for example, the process control device 30. In CP
U32 is the transmission control unit 3 as shown in step S1 in FIG.
131 that you own from the program selection information from 1.
It is determined whether or not there is a screen display program 131b that pairs with a, and if the screen display program 131b is owned, the screen display program 131b is executed in step S2 at a normal control cycle or a shorter operation cycle. Program 131
b is executed, and the execution result is stored in the memory 38 and transmitted to the CRT controller 10 via the transmission control section 31. This CRT controller 10 is a process control device 30. The screen display program 131a is executed using the latest information sent from the computer, and the processing information obtained as a result of executing the program is displayed on the CRT 18.

Note that if there is no double-sided display program that performs m6 by itself in step S1, the program is not stopped at all, but the cycle is sufficiently longer than the normal control cycle (10~
60 seconds, etc.), execute the main program or screen display program, store the program execution result in the memory 38, or CR the information stored in the memory 38 as appropriate.
The data is transmitted to the T controller 10. Note that this process control device 30. The period thinned out may be determined based on the process response speed, and the longer this period, the lower the load factor of the CPU 32 of the process control device 301 can be.

Therefore, according to the configuration of the embodiment described above, as the size of the plant increases and the amount of information increases, the CRT controller 1
A huge number of CRT screen display programs are concentrated on CRT screen display 0, but in this device, CRT double-sided display programs are
T controller 10 and lower control devices 30+, 302.
By distributing and storing the software in the CRT controller 10, an increase in the memory capacity of the CRT controller 10 can be suppressed, and the amount of software can be distributed smoothly and appropriately in the entire system. Moreover, the program currently displayed on the CRT 1g is executed at high speed according to the original control cycle, and other programs are executed at a sufficiently long cycle, so that the CPU 32 of the lower control devices 30+, 302, . . . It is possible to suppress an increase in the load factor, and it is possible to display a new display on both sides of a CRT without giving a sense of discomfort.

[Effects of the Invention] As explained above, according to the present invention, the CRT screen display program can be efficiently distributed between the CRT controller and each control device, without increasing the load factor of the CPU on each control device. It is possible to provide a digital control and monitoring system that can reduce the negative Gj rate of the CPU on the CRT controller side and can adequately cope with larger plants and increases in the amount of information.

[Brief explanation of drawings]

Fig. 1 is an eight-domain configuration diagram explaining one embodiment of the present invention, Fig. 2 is a diagram explaining the operation of a lower-order control device, and Fig. 3 is a conventional general distributed type = 1'' system control. It is a configuration diagram of the system. 10...CRT controller, 13.14...Memory, 15...CPU, 16...Transmission control unit, 18.
...CRT, 20...LAN, 30+, 302,
... Process control device, 31... Transfer control unit, 32... CPU-33+, 332... Screen display memory, 37... Main program memory, 13
1a. 132a, -, 13Na, 131b, 132b. ..., 13Nb...CRT screen display program.

Claims (1)

[Claims] A plurality of control devices that control a controlled object and a CRT controller are connected via a LAN, and the CRT controller executes a CRT screen display program using information from the control device or the keyboard. In the digital control and monitoring system, the CRT controller includes a program selection means for selecting a plurality of types of CRT screen display programs; and program selection information sending means for outputting information indicating that the specific CRT screen display program has been selected when a specific CRT screen display program is selected by the selection means, and each of the control devices Part of the screen display program is distributed and distributed from the CRT controller to the LAN.
Executes the applicable CRT screen display program that it owns based on the program selection information sent via the
A digital control monitoring system comprising a program processing means for executing other CRT screen display programs at a predetermined long cycle to suppress a load factor of a CPU of the CRT controller.