JPH02214397A - Remote monitor controller - Google Patents

Abstract

PURPOSE:To improve accuracy for time matching at a slave-slave station without provision of a master clock for each slave station by allowing each slave station to set a time matching period time again at a period shorter than a time matching period time in a master station by an internal counter and sending the time synchronizing data to the slave-slave station for time matching. CONSTITUTION:When a slave station receives a time synchronizing data, the slave station B starts an internal timer 11 immediately and the time matching period time is set at a period shorter than the time matching period time in the master station immediately again. When the time is reached, it is informed to a transmission section 10. When an interrupt signal for time matching to the slave-slave station is inputted by the internal timer in the transmission section, the time synchronizing data comprising the HDLC procedure is generated and when the interrupt input signal at the time matching start point of time is inputted, the time synchronizing data is sent to a slave-slave station C and after the transmission, the transmission protocol with the slave-slave station is interrupted and the flag transmission by the HDLC procedure is started. When the interrupt signal is inputted, the transmission section applies transmission processing the execution data representing the start of execution according to the HDLC format. The slave-slave station receiving the signal applies time matching similar to a conventional slave station.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a high-level data link control procedure (hereinafter referred to as H
DLC transmission method) is used to transmit information necessary for monitoring and controlling controlled equipment between a control center (master station) and a controlled station (substation) via an interrupted station (slave station). The present invention relates to a remote monitoring and control device that transmits time synchronization data for synchronizing time between a parent station and a grandchild station from a parent station to a grandchild station via a child station.

(Prior art) Conventionally, in remote monitoring and control devices that transmit information between a master station and a slave station using the HDLC transmission method, in order to improve the accuracy of time information added for the purpose of analyzing accident information, In addition, time synchronization was performed regularly between the master station and slave stations.

However, the time was not synchronized from the master station to the grandchild stations via the slave stations. Therefore, a conventional time synchronization method between a master station and a slave station will be explained here.

Figure 3 shows an example of its schematic configuration, and Figure 4 shows the interrupt signal sent from the master clock. In Figure 3, the relationship between the master station and slave stations is shown in the case of one unit. This is a configuration example.

That is, in FIG. 3, the master station A has an input section 32, a main microprocessor 33. Consists of a transmission section 34,
Input section 32. The main microprocessor 33 and the transmission section 34 are connected via an internal bus.

The transmission unit 34 is configured to receive an interrupt signal from the master clock 31 at regular intervals (T), for example, every minute.

The input unit 32 takes in time information from the master clock 31 and passes it to the main microprocessor 33 via an internal bus.

The main microprocessor 33 has a function of receiving and receiving time information from the input section 32 and recognizing an interrupt input signal for time adjustment to a slave station.
= 1 minute, To = 1 hour, and when the time is set every hour on the hour, when the main microprocessor 33 recognizes one minute before every hour, it notifies the transmission unit 34 of this fact.

Furthermore, the transmission section 34 is adapted to perform transmission processing such as transmission protocols of HDLC procedures, and is equipped with a sub-microprocessor.

When the transmission section 34 receives the signal one minute before the hour from the main microprocessor 33, it recognizes that the next interrupt input signal output from the master clock 31 is the signal to start time adjustment. At the same time, the old (Unnumber) in the control field defined in the HDLC transmission procedure
d Information) Generates time synchronization data for time adjustment consisting of a command and a global address in the address field, and generates a certain period of time (when an interrupt input signal (Ill) is input at the start of time adjustment).
to ) before transmitting the time synchronization data. After transmitting the time synchronized data, it has the function of interrupting the transmission protocol processing with slave station B, starting the transmission of the flag defined in the HDLC transmission procedure, and entering the interrupt input signal (In) wait state. .

The transmission unit 34 transmits execution data indicating the start of execution to the slave station B after the predetermined time (to), that is, when the interrupt input signal (In) is input, using the old command and the global address. Have the means.

On the other hand, the transmission unit 36 of the slave station B inputs and processes the time synchronization data sent in advance from the master station, and after the input, temporarily suspends other processing, so that the transmission unit 36 transmits the time synchronization data sent from the master station The present invention is equipped with a means that enables the time adjustment to be started immediately when the next execution data is input.

As shown above, in the conventional time synchronization method between a master station and a slave station, the master station sends time synchronization data to the slave station in advance, and the slave station - By interrupting processing, the accuracy of time synchronization at slave stations is improved, and by using time synchronization data made up of old commands and global addresses,
The time delay factor caused by the retransmission procedure was eliminated and the time was adjusted.

(Problems to be Solved by the Invention) Conventionally, in the configuration of a master station and a slave station, time synchronization has been performed as described above. However, when considering time synchronization in a master station, slave station, and grandchild station configuration, if you try to synchronize the time using the same method as the master station and slave stations described above, each slave station must have a master clock device in the master station. This would be practically impossible from an economical point of view.

Furthermore, even if each slave station is equipped with the same master clock as the master station, and it is possible to synchronize the time between the slave station and the grandchild station in the same manner as the master station and slave stations, the difference between the master clocks will be There is a drawback that it becomes difficult to improve the accuracy when setting the time at the grand station due to problems such as maintenance of a plurality of master clocks or the like.

The present invention has been made in view of the above-mentioned circumstances, and provides a remote monitoring and control device that can improve the accuracy of time adjustment at substations without considering a system in which a master clock is provided for each substation. is intended to provide.

[Configuration of Umei] (Means for solving the problem) In order to achieve the above object, the present invention performs transmission protocol processing according to the HDLC transmission procedure, and
In a remote monitoring and control device that monitors and controls a controlled device by transmitting the information necessary for monitoring between a relay station (slave station) and a controlled station (grandchild station), the master station receives the settings from the master clock. A determining means for determining whether or not a predetermined time period has elapsed before a predetermined time adjustment cycle time based on an interrupt signal sent every cycle; The old (tlnnuibered Inf) in the control field defined in the HDLC transmission procedure.
orma-tion) means for transmitting time synchronization data for time adjustment made up of a command and a global address in an address field to a slave station; The slave station includes a means for inputting and processing the time synchronization data sent in advance from the master station, and a means for inputting and processing the time synchronization data sent in advance from the master station, and a means for processing the time synchronization data sent in advance from the master station, and a means for transmitting execution data indicating the start of execution of the data to the slave station. means for interrupting the process and immediately transitioning to time adjustment when execution data sent from the master station after the predetermined period of time is input; an internal timer for outputting a time adjustment signal, a means for resetting the time adjustment cycle time using the internal counter at a shorter cycle than the time adjustment cycle time at the master station, and a means for setting the time adjustment cycle time newly set at the slave station. A determining means for determining whether or not a certain period of time has elapsed before the periodic time, and a UI command in the control field and an address field defined in the HDLC transmission procedure as soon as it is determined by this determining means that the certain period of time has elapsed. means for transmitting time synchronization data for time adjustment configured by a global address to the substation, and means for transmitting execution data indicating the start of execution to the substation at the re-set time adjustment cycle time. In preparation, the sub-station has a means for inputting and processing the time synchronization data sent in advance from the slave station, and after inputting, interrupts other processing and executes the time synchronization data sent from the slave station after the certain period of time. Do not configure it so that it has a means to immediately shift to time adjustment when data is input.

(Function) The input section of the master station receives time information from the master clock and passes it to the main microprocessor via the internal bus, and the transmission section receives interrupt signals from the master clock. Ru.

When the main microprocessor receives the time information from the input section, it notifies the transmission section 34 that it is one minute before the hour if the time is to be adjusted every hour on the hour. performs transmission processing such as the transmission protocol of the HDLC procedure.

In addition, when the transmission section receives the above-mentioned signal one minute before the hour,
Time synchronization data is generated according to the format defined by the HDLC transmission procedure, and is transmitted to the slave station a certain time (to) before the time adjustment interrupt input signal is input.

Furthermore, after a certain period of time (to), time data is transmitted to the slave station.

On the other hand, when the slave station receives the time synchronization data, it immediately starts an internal timer and sets the time adjustment cycle time again at a cycle shorter than the time synchronization cycle time at the master station. When the time has come, the transmitter 10 is notified of this fact. In addition, when the transmission unit receives an interrupt signal for time adjustment to the substation by an internal timer, it generates time synchronization data configured by the HDLC procedure, and the interrupt input signal at the time of starting time adjustment is input. Then, the time synchronization data is transmitted to the grandchild station, and after this transmission, the transmission protocol with the grandchild station is interrupted, and flag transmission using the HDLC transmission procedure is started.

Thereafter, when an interrupt signal is input, the transmission section transmits execution data indicating the start of execution according to the HDLC format. The grandchild station that receives this adjusts the time in the same way as a conventional slave station.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a remote monitoring and control device according to the present invention, and shows a case where the relationship between a master station, a slave station, and a grandchild station is one-to-one.

In FIG. 1, the configuration of the master station A is the same as that in FIG. 3, so its explanation will be omitted here.

On the other hand, the transmission unit 36 of the slave station B inputs and processes the time synchronization data sent in advance from the master station A, and after the input, temporarily suspends other processing, so that the transmission unit 36 receives the time synchronization data sent from the master station A next. The apparatus is equipped with a means for immediately starting time adjustment when the execution data is input.

The internal timer 11 is started after the time is set in the slave station B, and the internal timer 11 is started at the same fixed period time T= as the master clock 31 in the master station A.
After counting for one minute, an interrupt signal is output. That is, the state of the interrupt signal sent from the internal timer 11 in the slave station is the same as that shown in FIG. Furthermore, this internal timer 11 has a function to set the time adjustment cycle time again at a cycle shorter than the time adjustment cycle time at the master station A. For example, if To-1 time is set, the frequency is divided by 3 to 20 minutes. Count up with . Main microprocessor 3
5 is configured to notify the transmission unit 10 of this fact when it recognizes one minute before the 20-minute period.

Further, when the transmission section 10 receives the signal from the main microprocessor 35 for one minute before the 20-minute period, the next interrupt input signal output from the internal timer 11 is a signal to start time adjustment for the substation C. At the same time, Ul(υnnumbered In-fOr) in the control field defined in the HDLC transmission procedure
latiOn) Generates time synchronization data for time adjustment consisting of the command and the global address in the address field. Furthermore, this transmission unit 10 interrupts the current transmission protocol processing with the grand station C before a certain period of time (to) when the interrupt input signal (In) at the start of time adjustment to the grand station C is input. , has the function of starting the transmission of the flag defined in the HDLC transmission procedure and entering the interrupt input signal (In> wait state).

The transmission unit 10 transmits execution data indicating the start of execution to the grand station C using the old command and the global address at the time when the interrupt input signal (In) is input for the certain period of time <to>ft-, that is, when the interrupt input signal (In) is input. A means for transmitting is provided.

Note that the configuration of the grandchild station C is the same as that of the child station in FIG. 3, so the explanation thereof will be omitted here.

Next, the operation of the remote monitoring and control device configured as described above will be explained with reference to the flowchart shown in FIG.

In this case, since the relationship between the master station and the slave stations is the same as that of the conventional master station and slave stations, only the operation of the slave stations will be described here. First, in step S21, interrupt processing of time synchronized data is performed.Next, in step 822, it is determined whether or not the time synchronized data is composed of an old command.If it is determined that the command is an old command, the process proceeds to step 823. Even if reception fails in step 824, the received data is discarded in step 824 without proceeding to a retransmission request.
If the command is not an old command in step 822, it is processed as a data error in step 825.

Immediately upon receiving the time synchronization data in step 323, the internal timer 11 is activated in step 826 to start counting. The internal timer 11 sets the time adjustment cycle time again at a cycle shorter than the time adjustment cycle time at the master station A, and in step S27 it is determined whether the time to start the time adjustment is, for example, 1 minute before the 20 minute cycle. Determine. If it is determined in this step S27 that it is the time at which the time should be adjusted to the grandchild station, the transmission unit 10 is notified of this in step 328.

In step 829, the transmission unit 10 recognizes that the interrupt signal (In) output from the internal timer 11 is a signal to start time adjustment to the grand station, and at the same time, transmits the old command and global address. Generate time synchronization data configured.

If it is determined in step S30 that the interrupt input signal (■α) at the time of starting time adjustment is inputted a certain time <to> before, step S31 proceeds to step S29.
The time synchronization data composed of the old command generated in is transmitted, and after transmission, the current transmission protocol with grand station C is interrupted, and transmission of the flag defined in the HDLC transmission procedure is started.

When the input of the interrupt signal (In) is recognized in step S32, the transmission unit 10 transmits execution data indicating the start of time in step S33, also using the old command and global address. After such processing, the time synchronization data is sent from slave station B to grandchild station C via the transmission path.

As is clear from the above embodiment, since there is no need to provide a master clock device for each slave station, it is effective from an economical point of view.
Furthermore, problems of mutual errors between multiple master clocks and maintenance problems can be eliminated. Furthermore, by making the time adjustment cycle time between the slave station and the grandchild station shorter than the time synchronization cycle time between the master station and the slave station, it is possible to reduce errors in the grandchild station due to the intervention of the slave station. The accuracy of time adjustment can be improved.

[Effects of the Invention] As explained above, according to the present invention, when transmitting time synchronization data, it is not necessary to provide a master clock device for each slave station, and the time synchronization cycle time between the slave station and the grandchild station is By making the time adjustment synchronization time of the master station and the slave station shorter, it is possible to provide a remote monitoring and control device that can improve the accuracy when adjusting the time of the grandchild station.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a remote monitoring and control device according to the present invention, FIG. 2 is a flowchart for explaining the operation of the same embodiment at slave station B, and FIG. 3 is a conventional remote monitoring and control device. FIG. 4 is a block diagram showing an example of the configuration, and FIG. 4 is a diagram showing the state of an interrupt input signal from the master clock. 10, 13.34.36... Transmission section 11... Timer 12, 33.35... Main microprocessor 31
...Master clock 32...Input section A...Master station B...Slave station C...Grand station Fig. 1 Fig. Fig.

Claims (1)

[Claims] Transmission protocol processing is performed according to the HDLC transmission procedure, and the control center (master station), relay station (slave station), and controlled station (grand station)
In a remote monitoring and control device that monitors and controls controlled equipment by transmitting information necessary for monitoring and control between the master station and A determination means for determining whether or not the time has come before the specified time adjustment cycle time;
means for transmitting to a slave station time synchronization data for time adjustment consisting of a command (Unnumbered Information) and a global address in an address field; means for transmitting execution data indicating the start of the configured execution to the slave station, and the slave station includes means for inputting and processing the time synchronization data sent in advance from the master station; and means to immediately shift to time adjustment upon input of execution data sent from the master station after the predetermined period of time; and after the time adjustment, the means is activated and counts the same fixed period time as the master clock in the master station. An internal timer that outputs an interrupt signal,
means for setting the time adjustment cycle time again using this internal counter at a shorter cycle than the time adjustment cycle time at the master station; A determination means for determining whether or not the time has passed, and a time composed of a UI command in the control field and a global address in the address field defined in the HDLC transmission procedure as soon as the determination means determines that it is a certain time ago. means for transmitting time synchronization data for synchronization to the substation; and means for transmitting execution data indicating the start of execution to the substation at the re-set time adjustment cycle time; means for inputting and processing the time synchronization data sent in advance, and after inputting, temporarily suspending other processing, and immediately transitioning to time adjustment when execution data sent from the slave station after the certain period of time is input; A remote monitoring and control device characterized by comprising means for: