JPH0749724A - Time management system - Google Patents

Abstract

PURPOSE:To prevent the generation of time differences among plural devices by mutually connecting a system clock for managing the time of the whole system and plural devices to be managed by the time of the system clock and providing each device with a time difference data storing part and a time difference data processing part. CONSTITUTION:In the case of correcting the time of a device 31, the device 31 fetches correcting time data by a keyboard input or the like and fetches the time data of the system clock 2 through a transmission equipment 1. A difference between the correcting time data and the time data of the system clock is calculated and stored in a time difference data storing part 41 as time data. The time difference data are transmitted to all other devices 32, 33 through the equipment 1. The other devices 32, 33 receive the time difference data sent from the device 31 and sets up the data in time difference data storing parts 42, 43 included in its own devices 32, 33. Since reading/writing among plural devices does not compete with each other, respective devices 31 to 33 can be prevented from writing abnormal data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time management system managed by a common time.

[0002]

2. Description of the Related Art FIG. 10 shows, for example, an Intel iSB.
C CSM / 001 CENTRAL SERVICES
MODULE USER'S GUIDE (Orde
r Number. 146706-001 Page 5-
13 is a flowchart for reading / writing the date and time shown in 13). 10A is a flowchart for reading the date and time, b is a flowchart for writing the time, c is a flowchart for writing the date, and d is a flowchart for writing the date and time.

For example, in FIG. 10a, if the command register is read at X1, and the busy bit is not 0 at X2, then X is read.
Set a flag to indicate that the command register is being "read" in step 3, and read the command register in step X4.
If the ready state is reached at 5, the date and time are read at X6 and the end command is issued to the command register at X7. Although b, c, and d in FIG. 10 are omitted, almost the same processing as in FIG. 10a is performed.

FIG. 11 is a diagram showing a system clock that manages the entire system and a system of an apparatus that accesses the system clock according to the flow chart shown in FIG. 10. In FIG. 11, reference numeral 1 denotes exchange of time with the system clock. And a transmission line and a device for controlling this transmission. Reference numeral 2 is a system clock for time management of the system, and 31 to 33 are devices whose time is managed by the system clock 2, such as a personal computer and a workstation.

Next, the operation will be described. When acquiring the desired time, the device 31 acquires the time data from the system clock 2 via the transmission device 1 according to the flowchart shown in FIG. Further, also when the time of the system clock 2 is corrected, the time is corrected via the transmission device 1 according to the flowchart shown in FIG. The same applies to the devices 32 and 33.

[0006]

For example, while the device 31 is writing the date and time data to the system clock 2 according to the flowchart shown in FIG. 10d, another device 32, 33 reads the date and time data according to the flowchart of FIG. 10a. Once started, the system clock 2 time is completely
Abnormal time when not written by device 3
There is a possibility that the second and the second 33 may read and process them as the time of the entire system by the own device.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a device having a plurality of devices in which the time between the devices does not differ.

[0008]

In a time management system according to the present invention, a system clock for managing the time of the entire system and a plurality of devices managed by the time of the system clock are connected to each other, and a time difference is provided to each device. A data storage unit and a time difference data processing unit are provided.

Further, a system clock for managing the time of the entire system and a plurality of devices managed by the time of the system clock are connected to each other, and each device is provided with a clock, a time difference data storage unit and a time difference data processing unit. It is a thing.

Further, a plurality of the above time management systems are connected.

Further, the time difference data storage section of the above time management system is a storage section for storing the time difference data before time correction and the time difference data after time correction, and each device is periodically arranged at predetermined time intervals. A time series data storage unit for sampling and storing data and a data complementing unit for complementing the data stored in the time series storage unit are provided.

[0012]

According to the time management system of the present invention, when the time is corrected, the time difference data processing unit takes in the time from the system clock and obtains the time difference data between the taken time of the system clock and the input desired time. Calculated and stored in the time difference data storage unit, and use this time difference data to correct the time of the own device, and also transmit this time difference data to another device so that other device corrects it at the same time as the own device. Stored in the time difference data storage unit.

When the time is acquired, the time difference data processing unit acquires the time from the system clock and adds the time difference data in the time difference data storage unit to the acquired time of the system clock to acquire the time. did.

Further, when the time is corrected, the time of the device is loaded from the system clock by the clock of the device, and the data of the time difference between the loaded time of the system clock and the input desired time is read by the time difference data processing unit. The time difference data is stored in the storage unit, and the time difference data is corrected using the time difference data, and the time difference data is transmitted to another device to be corrected at the same time in the other device. Store.

When the time is acquired, the time difference data processing unit adds the time difference data stored in the time difference data storage unit to the time of the clock of the apparatus to acquire the time.

Further, the time difference data of one system is transmitted to another system, and the other system also corrects or acquires the time using this time difference data.

Further, the data complementing means sets the difference between the time difference data before the time correction and the time difference data after the correction as the correction time difference, obtains the number of data corresponding to this correction time difference, and when the correction is made so that the time advances, the above is performed. The data of the number of data corresponding to the correction time difference is complemented with specific data, and when the data is corrected so as to be delayed, the data of the number of data corresponding to the correction time difference is removed.

[0018]

【Example】

Example 1. The first embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is a transmission device for exchanging time with a system clock, 2 is a system clock for managing the system time, 31-33 are devices whose time is managed by the system clock 2, and 41-43 are respective devices. Three
Time difference data storage units that store time difference data representing the difference between the system timepieces 1 to 33 and the desired time in a memory or the like, and 71 to 73 are time difference data processing units that calculate the time difference data.

Next, the operation will be described. FIG. 2 is a flowchart for correcting the system clock data, and FIG.
Shows a flowchart for reading the system clock data. For example, when the device 31 attempts to correct using system clock data, the time difference data processing unit performs the following processing.

In S1 of FIG. 2, the device 31 takes in the correction time data by keyboard input or the like. In S2, the time data of the system clock 2 is fetched via the transmission device 1. In S3, the difference between the corrected time data fetched in S1 and the time data of the system clock fetched in S2 is calculated and stored as time data in the time difference data storage unit. Furthermore, in S4, S3
The time difference data calculated in step 3 is transmitted to all the other devices 32 and 33 via the transmission device 1. In the other devices 32 and 33, S
5, the time difference data sent from the device 31 is received, and S6
Is set in the time difference data storage units 42 and 43 in the own device.

Further, when the system clock data is to be obtained from the device 31, the time data of the system clock 2 is fetched via the transmission device 1 at T1 in FIG. 3 and T1 at T2.
The time difference data in the device 31 is added to the time data captured in step 3, and the time calculated in T2 is output as system clock data in T3.

Example 2. In addition, in the above-described first embodiment, the device 31
No. 33 to 33 do not have their own clocks, but time management is performed by a shared system clock. However, as shown in FIG. 4, each device 31 to 33 has an internal clock 21 to 23, If they are adjusted periodically, not only the same effect as that of the above-described first embodiment is obtained but also the system clock 2 is not accessed each time the time is corrected or read, so that there is no difference in the time between the devices and the transmission is performed. This has the effect of reducing the load on the device 1. For example, if each device has its own clock 21, 22 and 23 periodically aligned with the system clock once a day, it is not necessary to access each time the time is corrected or read.

Example 3. Further, as shown in FIG. 5, when the system A and the system B at remote locations are connected by the inter-system transmission device 5 such as a modem and a telephone line,
The time corrected by the device 33A of system A is system B
Device 43B of the system B via the transmission device 5
Each device 3 according to the flowcharts shown in FIGS.
If the time differences in the time difference data storage units 41B to 43B of 1B to 33B are corrected, the time of the system B is made to coincide with the time of both systems and all devices from a remote location without using the system clock 2B which is the reference clock in the system. be able to.

Example 4. Although the first to third embodiments have described the method of matching the time between the respective devices by using the time difference data, the case of performing the process of periodically storing the data as shown in FIG. 6 will be described. This processing is, for example, processing such as trend graph recording in which input data is recorded in time series, and the sampled measurement target data is stored.

The time difference data storage units of the respective devices are two, that is, the pre-correction time difference data storage unit 44 and the post-correction time difference data storage unit 45, and the time series data array 61 is periodically arranged in the time series data storage unit 60. Even if the time is corrected during the process of storing the data in ~ 6N, the data complementing means 81
Is the number of data corresponding to the difference between the data in the time difference data storage unit 44 before correction and the data in the time difference data storage unit 45 after correction, that is, the number of data calculated by (difference in time difference data) / (sampling interval). Time series data storage unit 60
By inserting or subtracting the time-series data arrayed between 61 to 6N, the correct time-series data is always set in the arrays 61 to 6N.

The supplementary data at this time may be either the current value or a specific value (0.0, etc.). As a result, the time correction can be performed without adding any special processing to the processing of time series data (for example, the trend graph display processing).

This will be specifically described with reference to FIGS. 7 to 9. For example, in a system in which data is sampled once per second in each storage unit of array numbers 1, 2, 3, ...
In the case of advancing by the minute, the data for 60 samples is not sampled as shown in FIG. 7a. Therefore, as shown in FIG. 7b, the data entered during this period (hatched portion of the data array) is the complementary data so as not to cut the graph.

Therefore, if the time is advanced as shown in FIG. 8a and if it is advanced by 1 sample / 1 second for 5 seconds, the array 2 of A is jumped to the array 7 of B, so that the complementary data is inserted into arrays 3 to 6. To do. Regarding the method of inserting the complementary data, the value 2.0 of the array 2 may be inserted as the complementary data as shown in FIG. 9a, or 0.0 may be inserted as the complementary data as shown in FIG. 9b.

Further, as shown in FIG. 9C, it may be complemented by linear approximation. When the data is a quadratic curve or other function curve, the data approximated by the least square method or another method may be complemented. That is, as the complementary data, it is possible to use specific data that is arbitrarily set according to the sampling target or that various calculation results are inserted.

[0030]

As described above, according to the present invention, the access to the shared system clock is made only for reading, the time correction calculates the time difference from the system clock, and the accurate time is calculated from the time difference. Since there is no competition in reading / writing between the devices, it is possible to match the time of each device without writing abnormal data in the device.

Further, by providing each device with a clock, access to the system clock is reduced, so that the load on the transmission device can be reduced.

Further, even if a plurality of systems are connected, time difference data can be transmitted between all the systems to easily adjust the time.

Further, by using the time difference data when the apparatus handles the time series data, the time difference data complementing process can be easily performed.

[Brief description of drawings]

FIG. 1 is a block diagram of a time management system according to a first embodiment of the present invention.

FIG. 2 is a flowchart when the time is corrected in FIG.

FIG. 3 is a flowchart when time is acquired in FIG.

FIG. 4 is a block diagram of a time management system according to a second embodiment of the present invention.

FIG. 5 is a block diagram of a time management system in Embodiment 3 of the present invention.

FIG. 6 is a block diagram of a time management system in Embodiment 4 of the present invention.

FIG. 7 is an explanatory diagram of data processing according to the fourth embodiment.

FIG. 8 is an explanatory diagram of data processing according to the fourth embodiment.

FIG. 9 is an explanatory diagram of data processing according to the fourth embodiment.

FIG. 10 is a flowchart showing an example of time acquisition / correction of a conventional clock.

FIG. 11 is a block diagram showing a conventional time management system.

[Explanation of symbols]

1, 1A, 1B transmission device 2, 2A, 2B system clock 5 inter-system transmission device 21-23 clock 31-33, 31A-33A, 31B-33B device 41-43 time difference data storage unit 44 hours pre-correction time difference data storage unit 45-hour corrected time difference data storage unit 60 time series data storage unit 61 to 6N time series data array 71 to 73, 71A to 73A, 71B to 73B time difference data processing unit 81 data complementing means

Claims (6)

[Claims] 1. In a time management system in which a system clock for managing the time of the entire system and a plurality of devices managed by the time of the system clock are connected to each other, each device includes a time difference data storage unit and a time difference data processing unit. Is provided
When correcting the time, the time difference data processing unit calculates the time difference data between the time taken from the system clock and the input desired time and stores it in the time difference data storage unit. The time of the own device is corrected using the data, and this time difference data is transmitted to the other device and stored in the time difference data storage unit of the other device so that the other device also corrects it at the same time as the own device. A time management system characterized by 2. The time management system according to claim 1, wherein when the time is acquired, the time difference data processing unit captures the time of the system clock and the captured time of the system clock is stored in the time difference data storage unit. A time management system characterized in that the time is obtained by adding. 3. A time management system in which a system clock for managing the time of the entire system and a plurality of devices managed by the time of the system clock are connected to each other, and each device has a clock, a time difference data storage unit, and a time difference data processing. When adjusting the time, the time is taken in from the system clock by the above-mentioned clock, and the time difference data processing unit calculates the time difference data between the time of the taken system clock and the input desired time. Then, the time difference data is stored in the time difference data storage unit, and the time of the own device is corrected using this time difference data, and the time difference data is transmitted to another device and corrected at the same time as the own device in the other device. The time management system is characterized in that the time difference data is stored in the time difference data storage unit. 4. The time management system according to claim 3, wherein when the time is acquired, the time difference data processing unit acquires the time by adding the time difference data in the time difference data storage unit to the time of the clock of each device. A time management system characterized by the above. 5. The time management system according to any one of claims 1 to 4, wherein a plurality of time management systems are connected, and time difference data of one system is transmitted to another system, and the other system is transmitted. The time management system is characterized in that the time difference data is also used to manage the time. 6. The time management system according to claim 1, wherein the time difference data storage unit is a storage unit for storing time difference data before time correction and time difference data after time correction. , Each device is provided with a time-series data storage section for periodically sampling data at predetermined time intervals and storing the data, and a data complementing means for complementing the data stored in the time-series storage section. The difference between the time difference data before the time correction and the time difference data after the correction is taken as the correction time difference, and the number of data corresponding to this correction time difference is obtained. Is supplemented with specific data, and when the correction is made so that the time is delayed, the data of the number of data corresponding to the above correction time difference is removed. Time management system.