JPH02287216A - Monitoring apparatus for plant - Google Patents

Abstract

PURPOSE:To enable highly reliable analysis or the like on a fault by arranging an external timepiece device and a branching device for transmitting time to a plurality of CPUs. CONSTITUTION:A time signal comprising a BCD code from an external time piece device 19 is converted into a data of a binary code through a branching device 20 and input/output controllers 3 and 13 to be set for an internal system timer provided within CPUs 1 and 11. Then, when there is no error during the reading of the time signal. It is judged whether a difference between time indicated by the time signal and time of an internal system timer is within a range necessary for correction and when the correction is necessary, after time of the binary code converted is set on the internal system timer, a confirma tion message is printed on typewriters 5 and 15 to be displayed on CRTs 6 and 16. When there is an error, an error message is printed on typewriters 5 and 15 to be displayed on the CRTs 6 and 16. This achieves a highly reliable analysis or the like on a trouble.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a plant monitoring device constituted by a computer system using a plurality of central processing units.

[Conventional technology]

4 and 5 are a block diagram and an external perspective view showing a conventional plant monitoring device. In the figures, l is a central processing unit, 7.17 is a plant to be monitored, and 2 is a plant 7.17. 5 is a typewriter as an output device; 6 is a CRT as an output device;
3 is a human output control device that controls the typewriter 5 and CRT 6; 4 is a system console that maintains the program of the central processing unit 1 via the input/output control device 3; and 8 is an internal system timer of the central processing unit 1. It is a crystal oscillator that creates the time. 11 to 16.18 correspond to 1 to 6.8 above, respectively. Next, the operation will be explained. The data is sent to the central processing units 1 and 2, where it is determined whether it is normal or abnormal. This determination result is converted into message data in a format that is easy for the operator to understand, and then printed or displayed on the typewriter 5, 15 or CRT 6.16 via the input/output control devices 3, 13. At this time, the time data in the display data is created based on the output of the crystal oscillator 8.18. Figure 6 shows an example of display data displayed on a typewriter 5, 15 or CRT 6°16.
The time, such as minutes and seconds, is displayed.

[Problem to be solved by the invention]

Since the conventional plant monitoring device is configured as described above, each central processing unit 1. crystal oscillator 8 in ll,
Since the time created by the crystal oscillators 8 and 18 is printed or displayed, the time varies depending on the characteristics of the crystal oscillators 8 and 18. Printed or displayed with a slight time lag by the arithmetic processing unit 1.11,
For this reason, there were problems such as inconveniences when performing accident analysis of Plant 7.17. This invention was made to solve the above-mentioned problems, and an object thereof is to obtain a plant monitoring device having an external clock device that can set the time of each central processing unit.

[Means to solve the problem]

The plant monitoring device according to the present invention includes an external clock device and a branching device that transmits time to a plurality of central processing units.

[Effect]

The plant monitoring device according to the present invention reads the time of the external clock device from the process input/output processing device and uses it as the time of each central processing unit.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, parts corresponding to those in FIG. 4 are designated by the same reference numerals, and their explanation will be omitted. In FIG. 1, reference numeral 19 indicates an external clock device, and 20 indicates a time signal outputted from the external clock device 19 through an input/output control device 3,
13 to each central processing unit 1.11. FIGS. 2(A) to 2(D) are a front view, a side view, a rear view, and an enlarged view of the main parts showing the external appearance of the external clock device 19, and FIG.
is the front panel, and 22 is the year 1 provided on the front panel 21.
A display section 23 displays 1 hour, 1 minute, 2 seconds of the first day of the month, etc., and 23 is an operation section on which various operation knobs such as a time setting knob and a power switch are arranged. FIG. 3 shows a flowchart illustrating the operation of reading the time signal output from the external clock device 19. Next, the operation will be explained. When reading the time signal output from the external clock device 19, there are three cases as shown in FIGS. 3(a), 3(b), and 3(c). (a) When the computer system is initialized. (b) When the operator requests an external time by operating the external time read push button from the CRT6.16 console. (C) When the external clock device 19 itself causes periodic interruptions. First, for cases (a) and (b) above, see Figure 3 (
This will be explained using the flowchart of a). In step STI, a time signal consisting of a BCD code from the external clock device 19 is read. In step ST2, it is determined whether or not there was an error during reading, and if there is no error, the process advances to step ST3. In step ST3, the BCD code is converted into binary code data, and this is set in an internal system timer provided inside the central processing units 1 and 11. Next step ST
In step 4, a confirmation message indicating that the internal system timer time has been replaced with external time is printed or displayed. Next, in step ST5, an attach process is performed to connect the external clock device 19 to the system via the branching device 20, and the process ends. In step ST2, if an error occurs when reading the time signal, an error message is issued in step ST6, and then a detach process is performed to disconnect the external clock device 19 in step ST7, and the process ends. Next, the case (C) in which there is a periodic interruption of the external clock device 19 will be explained using the flowchart of FIG. 3(b). First, the time signal is read in step ST8, and then it is determined in step ST9 whether or not there is an error during reading. If there is no error, the process proceeds to step 5TIO. Step 5
The TIO converts the BCD code of the time signal into a binary code and determines whether the difference between the time indicated by the time signal and the time of the internal system timer is within a range that requires correction. If the difference is not within the range that requires correction, the process ends and the internal system timer continues to be used. If the above correction is required, the process proceeds to step 5T11, where the time of the converted binary code is set in the internal system timer, and then the confirmation message is printed or displayed in step 5T12. Next step 5T
At step 13, the external clock device I9 is connected and the process ends. If there is an error in step ST9, an error message is printed or displayed in step 5T14, and then the external clock device 19 is disconnected in step 5T15, and the process ends.

【Effect of the invention】

As described above, according to the present invention, since the time of each central processing unit is configured to be synchronized with the time of an external clock device, variations in the mensage time outputted by each central processing unit during, for example, a plant trip are avoided. This has the effect of enabling highly reliable accident analysis.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a plant monitoring device according to an embodiment of the present invention, and FIGS. 3(a) and (t)) are flowcharts explaining the operation of the device, FIG. 4 is a block diagram showing a conventional plant monitoring device, and FIG. 5 is an external perspective view of the device. FIG. 6 is a configuration diagram showing a display example of the device. 1.11 is the central processing unit, 2.12 is the pro 14 is the system console, 5.15 is the typewriter, 6, 16
is a CRT, 7.17 is a plant, 19 is an external clock device,
20 is a branching device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1

Claims (1)

[Claims] A plurality of process input/output processing devices that read data from the plant, a plurality of central processing units that perform predetermined arithmetic processing on the read data, and a plurality of input/output control devices that output the results of the arithmetic processing. , a plurality of output devices for displaying the calculation results obtained via the input/output control device, a plurality of system consoles for maintaining programs of the central processing unit via the input/output control device, and an external clock. A plant monitoring device comprising a branching device that sends a time signal output from the external clock device to each central processing unit via the process input/output processing device.