JPH01154204A - Plant monitor method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital instrumentation control system, and particularly to a plant monitoring method suitable for advanced arithmetic control.

[Conventional technology]

It is known that a conventional device uses a CRT to monitor a plant, as disclosed in Japanese Patent Laid-Open No. 56-38609, for example. When performing such monitoring, create arithmetic operations and
Errors can be detected by compiling a grammatical check, but actual calculation results, that is, logical checks, are performed using a temporary PO2 or the like.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into consideration the point of checking for logical errors, and there is a problem in that it is necessary to temporarily stop the plant and perform debugging on the actual machine, which reduces the operating rate. In addition, it was necessary to separately provide a PO2 for debugging in each plant, which caused an economical problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plant monitoring method that allows simple control programs to be added and modified during operation and does not require a PO2 dedicated to debugging for each plant.

[Means for solving problems]

The above object is achieved by providing a simulation function and a monitor function within the POC.

[Effect]

The simulation function and monitor function simulate the simple control program you have created.

The progress of calculations is continuously monitored on the CRT. As a result, logical errors in the created simple control program can be discovered and mistakes can be corrected, so an incorrect program will not be loaded into the running PO2, so Plan 1- It never goes down or malfunctions.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention applied to a digital instrumentation control system, and FIG. 2 is a flowchart for explaining its operation.

In FIG. 1, reference numerals 1, 2.3 denote PCSL and PO 32 which perform direct digital control (hereinafter abbreviated as DDC) and sequence control by outputting calculation results to the plant based on set conditions.

PCSn will be installed in a distributed manner. 10 is a POC, which is a man-machine interface for monitoring plant operation.

11 is a CRT, P CS l 1, PO322.

Displays plant data sent from PCSo3. A keyboard 12 is used to change setting values, change loop status, and create and change simple control programs.

Next, the operation shown in FIG. 1 will be explained based on the flowchart shown in FIG.

First, start POCIO (step 300) and select whether to perform online monitoring or create an arithmetic expression (
310) Do. Man-machine, that is, CR
Create using keyboard 12 while looking at TII (320)
. Compile the created program (340), check for syntax errors (345), correct some errors if there are syntax errors (330), and compile again (345).
340) L. Remove syntax errors. When there are no syntax errors, perform simulation using the simulation function in POC (350), check for logical errors (355)L, if there are errors, correct part of the error again (330), and compile again. (3
40), perform a simulation (350) to remove all logical errors. Next, a bug-free program is downloaded to the corresponding PCS (360).

There is an online monitor (370) for reconfirming that the program has been downloaded correctly and is operating normally. At the end of the process, inputting the end key from the keyboard 12 brings the process to an end (380).

In the embodiment described above, the simulation function (step 350) was provided inside the PO'C 10 for the following reason. In other words, if the program you created has a bug and you download it,
This is because the system may go down or malfunction.

FIG. 3 shows the simulation (
Step 35o) screen and online monitor (
370). The CRTII is displayed as follows. That is, 100, 101. .

Reference numeral 102 denotes the arithmetic operation expression (step 32o) created in the above-mentioned embodiment, and the source statement numbered 1,
The source statement with number 2 is the source statement with number n, 200°201 is the value of the variable in the source statement 100 with number 1, and 202, 203
is the value of the variable in the source statement 101 with number 2.

Generally, the last number n source statement 102 has 5 TOP statements.

FIG. 4 is a loop sketch for explaining the present invention.

20 is a standard program of DDC, and 21 is a program added to the standard program 20 of DDC. 30 is a temporary instrument called a tag, FIG-001At
”, pv is the process amount, and 31.32Ll is the retag FIC-002A.

In LIC-001A, MV is the manipulated variable, and Woo 1
．． Woo2. Woo3 each has tag FIC-001
A30. FIC-002A31゜LIC-001A32
Normalized data (usually 0 to 6000 digits)
33 is the work area where the data converted into engineering values is stored, and 33 is the value of the work area Wool and the constant 3.1
25 means adding (+) the multiplied value and the value of work area WOO2, and the result is stored in work area WOO4. 34 is tag LIC-001A3
When the Ai abnormality flag IE, which is the status of 2, is O, it is connected to the b side, and when it is 1, it is connected to the a side.

35, when the status E of LIC-001A32 is 0, the work area WO'04 is changed to the work area WOO3.
means to divide (1) by , and the result is stored in work area WOO5. 36 converts the engineering value of work area WOO5 into normalized data and tag FIC-003A
This means storing it in the pv of

FIG. 5 shows the source statement and its variable values created from the loop sketch of FIG. 4 using an arithmetic operation expression, that is, control operation BASIC. The source statement 100 explained in FIG. 3 above is here 1, WOO1=EDC(F
IC-001A, PV) te, source statement 101 is 2 here, WOO2=EDC(FIC-
002A, PV) corresponds to D.

Further, the pv value 201 of the tag FIC-001A is 720 here, and the value Wool obtained by converting the normalized data into an engineering value is 12.0, which is 6 or less. Here, number 6 is a source statement that compares whether the AI abnormal flag 34 of the status of tag LIC-001A and constant 1 are equal (symbol, EQ,) in a conditional statement,
Here, since the AI abnormality flag 34 is O and they are not equal, the source statement in the first line number 7 and the following are executed.

If the AI abnormality flag 34 is 1, jump to line 9 without executing line 1 7°8. Also, number 8 B
DC means converting the engineering value of Woo5 into normalized data.

〔Effect of the invention〕

As described above, according to the present invention, the simulation function allows logical program bugs to be discovered before downloading to each PCS, so there is no need to install a PO2 dedicated to debugging in each plant, and the user It is very effective in terms of economy and simplification, and since the results of calculations can be seen on the online monitor, it is also effective in terms of plant monitoring, in that abnormalities in the plant can be detected at an early stage. Therefore, the operating rate also improves.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a flowchart showing the operating procedure of FIG. 1, and FIG.
FIG. 4 is an explanatory diagram showing the simulation screen and online monitor in FIG. be. 1...CPSl, 2...CPS2.3...CPS
n, 10...POC, 11...CRT, 12...
keyboard.

Claims (1)

[Claims] 1. A plant control unit (hereinafter abbreviated as PCS) that performs direct digital control or sequence control by outputting calculation results to the plant based on set conditions, and a man-machine that monitors the operation of the plant. Operator's console station (interface)
(hereinafter abbreviated as POC), a CRT that displays process data sent from each of the PCSs installed in a distributed manner, and the PCSs.
In contrast, in a plant monitoring device comprising a keyboard for changing set values, loop status, etc., a simple control program can be created using the keyboard. 2. The plant monitoring method according to claim 1, further comprising a compiler function that can check for errors in the syntax of the created simple control program. 3. By adding a simulation function to the POC, logical errors in the simple control program can be confirmed on the CRT before downloading to the PCS. plant monitoring methods. 4. The plant monitoring method according to claim 1, wherein after downloading the simple control program to the PCS, online monitoring can be performed on the CRT.