JPH0898263A - Remote supervisory and control equipment and time synchronizing device - Google Patents

Abstract

PURPOSE: To always make time data match the order of generation of state change and to eliminate an error in the analysis of state change by transmitting time synchronization data from the master clock of a master station at fixed periods and preventing the reversion of time data, to be added to state change data, due to correction of a time at the time of the occurrence of a state change when allowing a slave station to correct and synchronize a slave clock with the master clock. CONSTITUTION: The time of the slave clock just before correction is stored in a buffer 18 when the time synchronization data is received by the slave station B, and the time of the slave clock 16 after correction is compared wit the time stored in the buffer 18 by a comparison part 19. The time of the slave clock is selected when it is (a time of slave clock > a time buffer) and the time in the buffer is selected when it is (a time of slave clock <= a time in buffer) by operating a switch 20, and they are inputted to an information processing part 17 for state change analysis as the time data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distant monitoring control device and a time synchronizing device therefor, and more particularly to means for synchronizing the time of clocks installed in a master station and a slave station.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram of a conventional distant monitoring control device disclosed in, for example, Japanese Patent Laid-Open No. 1-352372.
In the figure, 10 is a master clock, 11 is an input unit for reading time data from the master clock, 12 is a main microprocessor, 13 is a transmission unit for communicating with the slave station B, 14 is a main microprocessor of the slave station B, 15 Is a transmission unit that communicates with the master station A, 16 is a child clock, and 17 is an information processing unit for state change (state change) analysis, which processes changes in the plant state. This is a case where the operating states of the circuit breaker and protection relay have changed (ON / OFF, occurrence / recovery, etc.).

Next, the operation will be described. The input unit 11 fetches the time information from the master clock 10 and transfers it to the main microprocessor 12 through the internal bus. When the main microprocessor 12 receives the time information from the input unit 11, it has a function of recognizing an interrupt input signal for time adjustment with respect to the slave station. For example, if one minute before the hour is recognized, The transmission unit 13 is notified. The transmission unit 13 performs transmission processing according to a transmission protocol defined between the master station and the slave station, and receives an interrupt signal sent from the master clock 10 at regular intervals. Is equipped with.

When a signal one minute before the hour is input from the main microprocessor 12 to this transmission unit, the interrupt signal issued from the master clock 10 is the signal for starting the time adjustment. And transmits the time synchronization data to the slave station B. In the slave station B, the transmission unit 15 receives the time synchronization data from the master station A, and passes the time synchronization data to the main microprocessor 14 through the internal bus. The main microprocessor 14 corrects the child clock 16 so as to match the time synchronization data. In this way, the time of the child clock is synchronized with the time of the master clock to adjust the time.

On the other hand, the state change analysis information processing unit 17 monitors whether or not the state change occurs in the monitored device, and when the state change occurs, the time of the child clock 16 is added to the state change information and stored. . This stored information is requested by the master station A,
It is transmitted to the master station A and passed from the master station A to a process computer (not shown). The process computer judges the state change occurrence order based on the time data added to the state change information and performs the state change analysis.

[0006]

Since the conventional distant monitoring control apparatus is configured as described above, a plurality of state changes occur in the slave station, and the state change analysis information processing unit provided in the slave station is used. If the time synchronization data is received from the master station and the time of the child clock is corrected in the direction in which the time of the slave clock is added to the status change information and stored sequentially, the time added to the status change information before correction Therefore, the time added to the status change information after correction may be earlier. When this information is transmitted to the master station and passed to the process computer, the process computer determines the occurrence order of the state change based on the time data added to the state change information. As a result, there is a problem that the state change analysis is mistaken.

The present invention has been made to solve the above problems, and the time to be added to the status change information stored in the status change analysis information processing unit is the slave clock based on the time synchronization data from the master station. It is intended to obtain a distant monitoring control device that does not reverse before and after the correction.

[0008]

A distant monitoring control device according to the present invention transmits the time of a master clock from a master station as time synchronization data, and a slave station receives the time synchronization data to obtain the time of the slave clock. In a distant monitoring control device having a time synchronizing device for correcting the time, a time synchronizing device for selecting one of the two times according to the comparison of the times before and after the time adjustment of the child clock, and the selected time Is used for monitoring control processing.

Further, in the remote monitoring control device having a time synchronizing device for transmitting the time of the master clock as time synchronization data from the master station, and for receiving the time synchronization data, the slave station corrects the time of the slave clock, The time synchronizer is a storage unit that stores the time of the slave clock immediately before the slave station corrects the time, a correction unit that corrects the slave clock to the time of the time synchronization data, the corrected time of the slave clock, and the stored time. According to the comparison with the above, a selecting means for selecting one of the two times is provided, and the selected time is used for the monitoring control processing.

Further, the time selected by the selecting means is added to the state change data when the state change occurs.

Further, the storage means is means for storing the time added to the state change data, and the selecting means is responsive to both the time added to the state change data and the corrected time of the child clock. It is a means for selecting one of the times.

Further, the time synchronizing device of the present invention transmits the time of the master clock as time synchronizing data from the master station, and the slave station receives the time synchronizing data and corrects the time of the slave clock. In the above, according to the comparison of the time before and after the time adjustment of the child clock, either one of them is selected and output.

[0013]

The distant monitoring control device of the present invention selects one of the two times according to the comparison of the times before and after the time adjustment of the child clock, and uses the selected time for the processing of the monitoring control. It is something that is done.

Further, the time synchronizing device in the storage means stores the time of the child clock immediately before the time adjustment by the slave station, the correcting means corrects the child clock to the time of the time synchronization data, and the selecting means corrects the child clock. In accordance with the comparison between the time and the stored time, either one of them is selected, and the selected time is used for the monitoring control process.

Further, the time selected by the selecting means is added to the state change data when the state change occurs.

Further, the time added to the status change data is stored in the storage means, and either one of the two times is stored according to the comparison between the time added to the status change data by the selection means and the corrected time of the child clock. Select the time of.

Further, the time synchronizing device of the present invention selects and outputs one of the two times according to the comparison of the times before and after the time adjustment of the child clock.

[0018]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, 10 is a master clock, 11 is an input unit that reads time data from the master clock, 12 is a main microprocessor, 13 is a transmission unit that communicates with the slave station B, 14
Is a main microprocessor of the slave station, 15 is a transmission unit for communicating with the master station A, 16 is a slave clock, 17 is an information processing unit for condition analysis, 18 is a buffer for storing the time immediately before the correction of the slave clock, 19 Is a comparison unit for comparing the time stored in the buffer with the time of the child clock, and 20 is the output of the buffer or the time data to be input to the information processing unit for state analysis based on the result of the comparison unit. It is a switch that switches whether to output the clock.

Next, the operation will be described. In the master station A, the input unit 11 takes in the time information from the master clock 10 and transfers it to the main microprocessor 12, and the transmission unit 13 receives the time information from the main microprocessor 12, for example, one minute before the hour, and the master clock 10 next. It recognizes that the interrupt signal issued from the signal is a signal to start time adjustment, and transmits the time synchronization data to the slave station. In the slave station B, the transmission unit 15 receives the time synchronization data from the master station and passes the time synchronization data to the main microprocessor 14 through the internal bus. The process up to this point is similar to that of the conventional device.

The main microprocessor 14 stores the time data of the child clock 16 in the buffer 18, and then corrects the child clock 16 according to the time synchronization data. Comparison unit 19
Compares the time data stored in the buffer with the time data of the child clock, and if the time of the child clock is later than the time stored in the buffer, tilt switch 20 in the direction shown in the figure to set the time of the child clock. Is sent to the information processing unit for state change analysis as time data. If the time of the child clock is earlier than the time stored in the buffer, the switch 20 is tilted in the opposite direction to the illustrated direction, and the time stored in the buffer is used as the time data for the state change information processing unit. Send to.

Next, the operation of the remote monitoring and controlling apparatus having the above-mentioned structure will be described with reference to the time chart shown in FIG. This time chart exemplifies a case where time synchronization data is sent from the master station every hour on the hour and the resolution of the time added to the status change data is in seconds. When the child clock is clocking 9: 00: 3 and the time synchronization data of 9:00:00 comes from the master station, the time of the child clock (9:00:03) is stored in the buffer. After that (T1), the child clock is corrected to 9:00:00 (T2). The child clock keeps time with its own clock until the next time synchronization data arrives.

The switch is tilted to the slave clock side until the time synchronization data comes, but after the slave clock is corrected, the slave clock is tilted to the buffer side because it is before the buffer time (T
3) and then the child clock is later than the buffer time 9
When the time reaches 0 minutes and 4 seconds, it falls to the child clock side (T4). Therefore, as for the time data to the information processing unit for state change analysis, after the timepiece is corrected (T3), 9: 00: 3 continues until the switch is tilted to the timepiece side (T4). This prevents the time data from being reversed before and after the child clock correction timing.

On the other hand, the state change A occurs at the timing of T5, and the time data at that time stores 9:00:00. Next, state change B occurs at the timing of T6, and the time data is 9
Memorize time 0 minutes 2 seconds. Since the state change C occurs at the timing of T7 and the time data is stored at 9: 00: 3, the occurrence order of the state changes A, B, and C and the order of the time data match.

As described above, in this embodiment, the slave station stores the buffer for storing the time of the slave clock immediately before the correction when the time synchronization data is received, the time of the slave clock after the correction and the time stored in the buffer. If a comparison unit for comparison is provided and the time of the child clock is corrected before the time of the buffer, the time of the buffer is changed until the time of the child clock becomes later than the time of the buffer. Since there is a time data selection switch to input to, the time data added to the state change data does not depend on the correction direction of the child clock and always matches the order of state change occurrence, so there is no error in state change analysis. Remote monitoring control can be performed.

Example 2. In the first embodiment described above, the case in which the buffer 18, the comparison unit 19, and the switch 20 are added to be realized by hardware has been described. However, as shown in FIG.
4 inputs to the information processing unit for state change analysis via the internal bus,
It may be performed by software processing of the main microprocessor 14. FIG. 4 shows a flowchart of software processing. First, when time synchronization data is received from the master station in step S1, the time of the child clock is stored in the buffer in step S2. Then, in step S3, the child clock is corrected according to the time synchronization data.

Next, in step S4, the time of the child clock after the correction is compared with the time immediately before the correction stored in the buffer,
If the time of the child clock is later, the time of the child clock is output to the information processing unit for state change analysis in step S5. Next, in step S6, it is determined whether or not there is time synchronization data from the master station, and if there is no time synchronization data, step S5 is repeated. If so, the process returns to step S1. If the time of the child clock is earlier than the time stored in the buffer in step S4, the time of the buffer is output to the information processing unit for state analysis in step S7.
Then, the process returns to step S4, and step S7 is repeated until the time of the child clock is later than the time of the buffer.

As described above, in this embodiment, when the main microprocessor of the slave station receives the time synchronization data from the master station, after storing the time of the slave clock in the buffer, the slave clock is adjusted to the time synchronization data. The time data stored in the buffer is compared with the time of the child clock, and either the time stored in the buffer or the time of the child clock is input to the information processing unit for state change analysis based on the determination result. Since the software processing is performed as described above, it is possible to perform remote monitoring control without causing an error in the state change analysis, without adding special hardware.

Example 3. In the first embodiment, the case where the time of the child clock is stored in the buffer before the correction of the child clock when the time synchronization data is received from the master station has been described. However, as shown in FIG. Even if the time added to the state change data is stored in the buffer every time the state change data is stored, the same effect as that of the above-described embodiment is obtained.

As described above, in this embodiment, the state change analysis information processing unit of the slave station compares the time added to the state change data with the buffer that stores the time and the time of the child clock. Section and a time data selection switch that is driven according to the judgment result of the comparison section, even if the time of the child clock returns to the front by the time synchronization data, the status change data with the time data after the return time added Without,
Since the time can be immediately added to the state change data with the corrected time, it is possible to provide a distant monitoring control device that can add more accurate time data and does not cause an error in the state change analysis.

Example 4. In the third embodiment, a case has been described in which it is realized by hardware, but the same effect can be obtained even if this is soft-processed by the main microprocessor and the sub-microprocessor of the information processing unit for state change analysis. FIG. 6 shows a flowchart of software processing. On the main microprocessor side, when time synchronization data is received from the master station in step S1, step S2
Then, the child clock is corrected according to the time synchronization data. Next, in step S3, the time of the child clock is output to the information processing unit for state change analysis. Next, in step S4, it is determined whether or not there is time synchronization data from the master station, and if there is no time synchronization data, step S3 is repeated. If so, the process returns to step S1.

On the sub-microprocessor side of the state change analysis information processing unit, it is determined whether or not there is a state change in step S5. If there is a state change, in step S6, the sub clock of the main clock passed in step S3 of the main microprocessor is detected. The time data is compared with the time in the buffer provided in the sub microprocessor, and if the time of the child clock is later, the time of the child clock is stored in the buffer in step S7. Next, in step S8, the buffer time is added to the state change data and stored. If the time of the child clock is earlier than the time of the buffer in step S6, step S7 is not performed, and the time of the buffer, that is, the time added to the last occurrence of the event is added in step S8. To be added and stored.

As described above, in this embodiment, the main microprocessor of the slave station and the sub-microprocessor of the information processing unit for state change analysis store the time added to the state change data in the buffer and store it in the buffer. Compare the time data and the time of the child clock, based on the judgment result,
Since the software processing was performed to select the time data to be added to the state change data, it is possible to provide a distant monitoring control device that can add a more accurate time without adding special hardware and does not cause an error in the state change analysis. be able to.

Example 5. In the above embodiment, the time synchronization data is transmitted from the master clock at a constant cycle (for example, every 30 minutes), but the time synchronization data may not be a constant cycle or may be an indeterminate cycle. For example, the cycle may be shortened when the occurrence of the state change is large, and may be lengthened when the occurrence is small.
Further, the time synchronization data may be transmitted when there is some event such as occurrence of a state change. Further, the time signal such as FM broadcast from the broadcasting station may be used as the time synchronization data from the parent station to correct the child clock.

Example 6. In the above embodiment, the example applied to the distant monitoring control device has been described, but it can be applied to a device other than the distant monitoring control device when the time is not reversed before and after the correction. That is, it can be applied to various devices as a time synchronization device like the embodiment of the present invention.

[0035]

As described above, according to the present invention, the time is selected and used for the monitoring control according to the comparison of the time before and after the time adjustment of the child timepiece. There is an effect that it is possible to provide a remote monitoring control device in which the time is not reversed.

Further, since the time selected by the selecting means is added to the state change data, the time data added to the state change data does not depend on the correction direction of the child clock, and always coincides with the order of occurrence of state change. Therefore, there is an effect that it is possible to provide a remote monitoring control device that does not cause an error in the state change analysis.

Further, since the time is selected and output according to the comparison of the time before and after the time adjustment of the child clock, there is an effect that it is possible to provide a time synchronizer in which the time is not reversed before and after the time adjustment of the child clock.

[Brief description of drawings]

FIG. 1 is a block diagram of a remote monitoring control device according to a first embodiment of the present invention.

FIG. 2 is a time chart of a slave station of the remote monitoring control device according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a remote monitoring control device according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a slave station of the remote monitoring control device according to the second embodiment of the present invention.

FIG. 5 is a block diagram of a remote monitoring control device according to a third embodiment of the present invention.

FIG. 6 is a flowchart of a slave station of a remote monitoring control device according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram of a conventional remote monitoring control device.

[Explanation of symbols]

10 master clock, 11 input section, 12 main microprocessor, 13 transmission section, 14 main microprocessor, 15 transmission section, 16 sub clock, 17 state change analysis information processing section, 18 buffer, 19 comparison section, 20 switch.

Claims (5)

[Claims] 1. A master station transmits the time of a master clock as time synchronization data, and a slave station receives the time synchronization data,
In a distant monitoring control device having a time synchronizer for adjusting the time of the child clock, a time synchronizer for selecting one of the two times according to the comparison of the time before and after the time adjustment of the child clock, A remote monitoring control device, characterized in that the selected time is used for the processing of monitoring control. 2. The master station transmits the time of the master clock as time synchronization data, and the slave station receives the time synchronization data,
In a distant monitoring control device having a time synchronizer for correcting the time of a child clock, the time synchronizer stores the child time of the child clock immediately before the slave station adjusts the time, and the child clock in the time of the time synchronization data. Depending on the correction means to correct and the time of the corrected child clock and the stored time,
A distant monitoring control device comprising: a selecting means for selecting one of the two times, and the selected time is used for the processing of the monitoring control. 3. The distant monitoring control device according to claim 2, wherein the time selected by the selecting means is added to the state change data when the state change occurs. 4. The storage means according to claim 2, wherein the storage means is means for storing the time added to the state change data, and the selecting means compares the time added to the state change data with the corrected time of the child clock. According to the present invention, the remote monitoring and control device is characterized in that it is a means for selecting one of the two times. 5. The master station transmits the time of the master clock as time synchronization data, and the slave station receives the time synchronization data,
In a time synchronization device for adjusting the time of a child clock, one of the two times is selected and output according to the comparison of the times before and after the time adjustment of the child clock. apparatus.