JPS62274957A - Diagnostic method for indefectible state of plant monitor device - Google Patents

Abstract

PURPOSE:To check the indefectible state of an overall system including interfaces by transmitting specific information from an I/O to a CRT through subsystems and turning back the input signal to the CRT from the CRT to the I/O through subsystems. CONSTITUTION:A check signal 13C which checks the indefective state of the system is inputted to a data link device 3 as a check signal 14c via an I/O 2 Processings are performed in the data link device 3 and an arithmetic processor 4 to display a signal 15d on a CRT 5. Since the signal 15d is uniquely determined by the signal 13c, an operator observes the display on the CRT 5 to detect that the overall system from an I/O 2 to the CRT 5 is operated indefectibly. The signal 15d is inputted to a processing part 15b. Processings are performed in processing parts 15b and 14b. When a signal 13d is inputted to a processing part 13b to terminate the processing, it is decided whether processings in 13a 14a 15a 15b 14b 13b are indefectible or not because the output signal is uniquely determined correspondingly to the signal 13c.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention provides a plant monitoring device that monitors the status of a plant by displaying it on a display device (hereinafter abbreviated as CRT). The present invention relates to a health diagnosis method for diagnosing whether or not a device is operating normally.

[Conventional technology]

FIG. 2 is a block diagram showing the configuration of the plant monitoring device, in which (1) is the plant to be monitored, (21
is an input/output device (hereinafter abbreviated as I10), (3) is a data link device, (4) is an arithmetic processing device, and (5) is a CRT.
It is. The operation of the apparatus shown in FIG. 2 is well known and will not be described further.

FIG. 3 is a block diagram showing a conventional method for diagnosing the health of each part of the device shown in FIG. 2 (7).

+81, +91, (10) are diagnostic logic, (7a) respectively.

(8a), (9a), and (10a) are output signals from each diagnostic logic, and (12) is a management department.

Diagnostic logic +71, +81, 191, (1
0) indicate diagnostic logic corresponding to Ilo +21, data link device (3), arithmetic processing unit (4), and CRT +51, respectively.

For example, to explain the operation of the diagnostic logic (7) for l10f21, when a side abnormality occurs in the operation of I/(]21, the diagnostic logic (7) detects this and sends an error signal indicating the occurrence of the abnormality. (7a) is output and the management department (
12). The management department (12) outputs an abnormality occurrence alarm in response to this. Other diagnostic logic +81,
+91, (10) also performs a similar operation.

[Problem that the invention seeks to solve]

Conventional health diagnostic methods are executed in the manner described above, and while they can diagnose the health of each individual device, they cannot diagnose the health of the overall system, including the interfaces between devices. There was a problem.

This invention was made to solve the above problems, and it is possible to diagnose the health of the entire system with a simple procedure, as well as to check the health of each subsystem that makes up the entire system. The aim is to obtain a method that can also be used for diagnosis.

[Means for solving problems]

In the method of this invention, specific information for diagnosing the health of the system is sequentially passed to the receiver from l10-) data link device to arithmetic processing unit to CRT, and this information is passed to the CRT.
At the same time, the input signal to the CRT is sent back to the CRT -> arithmetic processing unit -> data storage unit -> I10, so that the information input to Ilo at the beginning is displayed correctly on the CRT and as correct information within a predetermined time. Diagnose the health of the system by returning to Ilo.

[Effect]

Since information is passed between each subsystem, the health of the overall system including interfaces can be easily checked.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which the same symbols as in FIG. 2 indicate the same or corresponding parts, and (13a), (14a), and (15a) are respectively I
lo 12+, data link equipment fit 131, which is a processing unit provided in the arithmetic processing unit (4) for processing input signals from the plant (1) and displaying the processed signals on the CRT 15+.

(15b), (14b), and (13b) are provided especially for diagnosis, and are used to output signals of processing results in the arithmetic processing unit (4).
This is a processing unit that performs processing for sending the data back to 10f21. However, as shown in Figure 2, where the signal line arrows are pointing in both directions, the plant monitoring device may also serve as the plant control device, and when operating as a control device, the arithmetic processing unit (4) Data link equipment for generated signals! (
3) and Ilo +21 to the plant, a processing circuit as a control device can be used for part or all of the parts (15b), (14b), and (13b) in FIG.

(13c), (14c), (15c), (15d), (
14d) and (13d) are information transmitted between each device to check the health of the monitoring system, and are simply referred to as check signals in this specification.

FIG. 4 is a flowchart showing the basic processing procedure in each subsystem shown in FIG.
l (17) and (18) indicate each processing step. If FIG. 4 is viewed as showing the processing within Ilo +21 of FIG. 1, signals (13c) and (14c) correspond to signals (16a) and (18a). Signal (13c)
is a processing unit (13b) to check the health of the system.
), which is called a check signal, and which simulates the signal from the plant (1). The check signals are shown in FIG. 4 (16) and (17).

After the processing in (18), it is output as a signal (14c).

That is, signal (14c) (generally signal (18a)
) is signal (13c) (generally signal (16a)
), and if it is a signal other than that, the health diagnosis logic provided in Ilo+21 (not shown as a block, but processing steps (16) and (17) , (considered to be included in (18)) outputs an error signal. If this error signal is not output, the signal (14c) is input to the data link device (3) as a check signal for system health check. The processing shown in FIG. 4 is also carried out in the data link device (3) and arithmetic processing device (4), respectively, and the signal (15d) is displayed on the CRT 15+.

Since the signal (15d) is a signal uniquely determined by the signal (13c), the operator who generated the signal (13c) observes the display on the CRT +51 and determines Ilo +2.
We know that the comprehensive system from 1 to CRT +51 is working properly. The signal (15d) also becomes an input to the processing section (15b). Processing section (15b), (14b
) is also as shown in FIG.

FIG. 5 is a flowchart showing the processing of the processing section (13b) in FIG. 1, and (19) to (24) indicate each process.

Signal (13d) is input, steps (1, 9),
When the process of (20) is completed, the output signal of step (20) is uniquely determined corresponding to the signal (13c), so from this, (13a) −+ (14a)→(,15a)
-+ (15b) → (14b) -+ (Dab) inner (
It is possible to determine whether or not the processes up to (19) and (20)) are sound. This determination is made in step (21),
If the result is NO, an error signal is output in step (24), and if the determination in step (21) is Yaa, the data is changed in step (22), for example, the logic of the bit of the previous data is inverted. The next check signal (13c) is output as the next check signal (13c), and the system health check is repeated.

Furthermore, an error signal is also output when the signal (13d) does not arrive within a predetermined time from the output point of the signal (13c).

In the above embodiment, the information for checking the system health, that is, the generation source of the check signal is Ilo +21
Step (21) in FIG.

The parts that execute (22), (23), and (24) may be provided as independent devices, and this device may generate a check signal that simulates the input from the plant (1).

〔Effect of the invention〕

As described above, according to the present invention, simple logic is used to check the overall system health of a plant monitoring device that displays a signal representing the plant status on a CRT via Ilo, a data link device, and an arithmetic processing device. Highly reliable diagnosis can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a plant monitoring device subject to health diagnosis, and FIG. 3 is a block diagram showing a conventional method.
FIG. 4 shows the processing units (13a), (14a) and (15) in FIG.
a), (15b), (14b), FIG. 5 is a flowchart showing the processing in the processing section (13b) of FIG. 1, (1) is a plant, (
2) is Ilo, 1al is data link device, (4) is arithmetic processing unit, (5) is CRT, (13a), (1
4a), (15a), (15b), (14b). (13b) are processing units, (13c) and (14c) respectively.
, (15c). (15d), (14d), and (13d) are check signals for system health diagnosis. (21) is a system health determination step, and (22) is a system health check signal generation step. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) Input the signal from the plant to the input/output device, transmit this input signal to the arithmetic processing unit via the data link device, process the transmitted signal in the arithmetic processing unit, and display it on the display device. A method for diagnosing the health of a plant monitoring device that diagnoses the health of its operation includes a check signal generation step for generating a check signal that simulates a signal from the plant; A check signal loopback that transmits the check signal from the device to the arithmetic processing unit via the data link device, and transmits the check signal processed by the arithmetic processing device from the arithmetic processing device to the input/output device via the data link device. a transmission step; a diagnosis step of diagnosing the health of the overall system of the plant monitoring device by comparing the signal transmitted to the input/output device through the check signal loopback transmission step with the check signal generated in the check signal generation step; A method for diagnosing the health of a plant monitoring device, comprising: (2) Health diagnosis of a plant monitoring device according to claim 1, wherein the check signal loopback transmission step includes a step of displaying the check signal processed by the arithmetic processing unit on a display device. Method. (3) The check signal loopback transmission step includes a step of checking, in each subsystem, the correspondence between the check signal input to the subsystem and the check signal output from the subsystem. A method for diagnosing the health of a plant monitoring device according to scope 1.