JP2626022B2 - Line monitoring by polling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] A data request d ₁ is transmitted to each slave station constituting a line in series with a master station such as a wireless line, and monitoring data D ₁ of each station is transmitted from each slave station.
Similarly data request and rising parent station when該回line Porigu system becomes cross collect receiving allowed send a to D _n
Regarding the line monitoring method based on polling, which provides a quasi-master station prepared to send d ₂ and receive monitoring data of each slave station and collects and monitors monitoring data, when the quasi-master station starts up in the event of a line failure, The main station, quasi-parent station, and slave stations that make up the line are automatically operated so as to be in the best monitoring state, and the monitoring data of each slave station can be centrally monitored without any trouble. When both stations receive a data request from another quasi-master station or a master station, means for stopping the data request transmitted from the own station and performing only reception operation, and each slave station is connected to all lines Means for transmitting the monitoring data of the own station only in the direction in which the data request came, and receiving the data request only when the data request is received. The master station automatically monitors each slave station without any trouble. Configured so as to collect the city monitoring.

[Industrial applications]

The present invention relates to a remote control monitoring device for collecting and monitoring monitoring data of each slave station of a wireless line in a master station, and in particular, the master station issues a data request command to each slave station to collect monitoring data of each slave station. And collects data from each station and performs centralized monitoring by using a line monitoring method by polling. In the line monitoring method by polling, only one master station can be set on the line, and if the line is disconnected due to a failure, the slave station to which the request command of the master station does not reach cannot be monitored. Therefore, when a plurality of master stations are prepared and a line monitored by one master station is disconnected, another station on the line starts up as a master station, sends a data request command, and collects slave station data. However, in this case, in a state where a part of the line is broken in only one of the up and down, the request commands and slave data of the two master stations collide,
The line will be confused and normal monitoring will not be possible for both parents.
For this reason, each station must transmit or stop data so that the line is not disrupted.

[Conventional technology]

In the conventional line monitoring system by polling, as shown in (3-1) normal time in FIG. 3, each slave station S ₁ responds to a data request d ₁₁ , d ₁₂ , d ₁₃ from the master station 10M at the left end of the line. , S ₂ , and S ₃ unconditionally monitor the local station's monitoring data D ₁ , D ₂ , D ₃
Was sent out. (3-1) Normal monitoring is performed by setting the quasi-master station 20M 'at the right end of the quasi-master station (a station prepared to rise as the master station when the line is disconnected) 20M'.
The monitoring data of the data request d ₁₄ and the slave station S ₁ to S ₃ of the master station 10M
Since D _{1 to} D ₃ can be received together, each slave station S can be received similarly to the master station 10M.
_1, S _2, it is possible to carry out the monitoring of S _3. The failure occurs in the line, in a case where both the left and right directions becomes interrupted between the slave station S ₂ and the slave station S ₃ (3-2a), launched quasi master station 20M 'as the parent station, the parent by (3-2b) for transmitting station 10M as well as the data request d _2, it is possible to perform quasi-parent station 20M 'monitoring Niteko station S _3.

[Problems to be solved by the invention]

However, the left direction between becomes disconnected only right child station S ₂ and the slave station S ₃ in the normal case (3-3a), the raises quasi master station 20M 'as the parent station (3-3c), master station 10M, slave station S _1, the slave station S
₂ confuses data D (3-3b), master station 10M, quasi-master station 20M '
Cannot perform normal monitoring. Also, slave station S ₂ and slave station
When the left direction between the slave station S ₂ and the slave station S ₁ in addition to the right between ₃ becomes disconnected (3-4a), when raises quasi master station 20M 'as the parent station ( 3-4b), data D is confusing to the master station 10M, quasi-master station 20M 'can not be performed normally monitored by the slave station S ₂ (3-4c). Therefore, if it is desired to monitor in the best condition as a system, the master station 10M must judge the operation of each station when the quasi-master station 20M 'is started up as the master station in the individual state of the line, and If the master station 10M is started up by mistake, the quasi-master station 20M 'does not perform normal monitoring, and there has been a problem that the master station 10M cannot recognize it. SUMMARY OF THE INVENTION It is an object of the present invention to automatically operate each station so as to be in the best monitoring state when the quasi-master station 20M 'at the time of a line failure is started up.

[Means for solving the problem]

This problem can be solved by referring to FIG.
20 when raised, first base station 10, both in the quasi-master station 20, data request d ₂ or d ₁ from the other semi-master station 20 or the master station
Is received, the data request d ₁ transmitted from the own station is received.
Or d ₂ performs only reception operation stop, all slave station 1~n performs reception of both right and left directions of the line separately, when receiving a data request d ₁ or d _2, the data request comes The problem is solved by the configuration of the present invention in which the monitoring data D of the own station is transmitted only in the direction.

In the principle diagram of FIG. 1 showing the configuration of the line monitoring system by polling according to the present invention, reference numeral 10 denotes a data request d1 to each of the serial slave stations ₁ to n forming a line, Monitoring data of own station from n
D ₁ child station 1 by receiving and poll allowed send a to D _n
Ｎn is a master station for centralized monitoring.

20, rising as the master station when a portion of the line becomes the cross-sectional are quasi master station which is ready to transmit a data request d _2.

1 to n are installed in series with the master station 10 and the quasi-master station 20,
Each of the slave stations constituting the line, receives data requests d ₁ and d ₂ from the master station 10 and the quasi-master station 20, and monitors the monitoring data D _{1 to} D _{n of the} own station.
Is returned to the master station 10 or the associate master station 20.

[Action]

In the present invention, the state of the above (3-3b), i.e. becomes disconnected only the right direction between the slave station S ₂ and the slave station S _3, if there is left a normal, standing quasi master station 20 as the master station in a state where the raised was, configuration, that is, when the parent station 10, both the semi-master station 20, receives the data request d ₂ or d ₁ from the other semi-master station 20 or base station 10, transmitted from the own station and by performing only reception operation stop data request d ₁ or d ₂ is, since the data request d ₂ from quasi-master station 20 the base station 10 is received, the master station 10 the data request of the local station stopping the transmission of d _1, a receiving operation only. Therefore, confusion of the data D in the master station 10, the slave station 1, and the slave station 2 is avoided. Further, the state of the above (3-4b), that is, the slave station S ₂
If left between the slave station S ₂ and the slave station S ₁ in addition to the right between the slave station S ₃ becomes disconnected and (3-4a), the startup quasi master station 20 as the master station In the closed state, the configuration of
All receive the data request d in the left and right direction of the line separately, and send the monitoring data D of the own station only in the direction from which the data request d came, so that the slave station 2 is the monitoring data D ₂ receives a data request d ₁ coming from the left master station 10 to the left master station 10, monitoring data D receives a data request d ₂ coming from the right semi-master station 20 since back ₂ to the right of the quasi-master station 20, the confusion of the data D ₂ in the slave station 2 is avoided the problem is solved.

〔Example〕

FIG. 2 is a block diagram showing a configuration of a line monitoring system by polling according to one embodiment of the present invention. The master station 10 at the left end of the wireless line is a master station M, and the slave stations 1 to n have n = 4. by and 4 slave stations 1-4 are placed in series a slave station _{1, S 2, S 3,} S 4. Then, the quasi-master station 20 is composed of the slave station S ₂ a preparation station M ₁ between the slave station S ₃ 'and the slave station S following line right end of the quasi-master station M ₂ of _4', in the event of a failure, The rightmost quasi-master station M ₂ ′ is started up as a master station, and sends out a data request d ₂ in the same manner as the left-most master station M. The embodiment of FIG. 2, the left direction between the right and the slave station S ₁ between the slave station S ₃ and the slave station S ₄ are the radio link failure, the leftmost data from the master station M The request d ₁ can be received by the slave stations S ₁ and S ₂ , the quasi-master station M ₁ ′, and the slave station S ₃ , but the slave station S ₄ and the quasi-master station
M ₂ ′ cannot be received. The data request d ₂ from the rightmost quasi-master station M ₂ ′ can be received by the child station S ₄ , the child station S ₃ , the quasi-master station M ₁ ′, and the child station S ₂ , but the slave station S ₁ , Station M cannot receive. Therefore, according to the above configuration of the present invention, the slave stations S ₁ and S ₂ , the quasi-master station M ₁ ′, and the slave station S ₃ monitor each other when receiving the data request d ₁ from the left master station M. The data D ₁ , D ₂ , D _M1 , D ₃ are transmitted to the left master station, and are received and centrally monitored by the master station M. In addition, child station
S ₄ , the slave station S ₃ , the quasi-master station M ₁ ′, and the slave station S ₂ receive the data request d ₂ from the right quasi-master station M ₂ ′ and receive the monitoring data D ₄ , D ₃ ,
D _M1 and D ₂ are transmitted to the quasi-master station M ₂ ′ on the right side, and are received and centrally monitored by the quasi-master station M ₂ ′. Therefore, there is no problem because the monitoring data of each slave station and the quasi-master station M ₁ ′ that cannot be started can be monitored in the best condition separately for the master station M and the quasi-master station M ₂ ′.

〔The invention's effect〕

As described above, according to the present invention, when the quasi-master station is set up as the master station when a failure occurs in a part of the line, the master station, the slave station, and the quasi-master station are automatically set to the best monitoring state. As a result, the monitoring data of each slave station on the wireless line can be collected and monitored without any trouble, and the effect of improving the performance of monitoring can be obtained.

[Brief description of the drawings]

FIG. 1 is a principle diagram showing a configuration of a line monitoring system by polling according to the present invention, FIG. 2 is a signal flow chart showing a configuration of a line monitoring system by polling according to an embodiment of the present invention, and FIG. It is a signal flow chart of a monitoring system. In the figure, 1 to n are slave stations, 10 is a master station, and 20 is a quasi-master station.

Claims (1)

(57) [Claims] 1. A data request (d ₁ ) is transmitted to each of the slave stations ( ₁ to n) forming a line in series with the master station (10), and the respective slave stations monitor data (D _{1 to} D) of each station. _n ) is transmitted, and the polling method of collecting and collecting the data is such that when the line is disconnected, it rises up and transmits a data request (d ₂ ) in the same manner as the master station (10) to receive monitoring data of each slave station. Associate parent station prepared in (2
0) in the line monitoring system by polling for collecting and monitoring monitoring data. When the quasi-master station (20) is started up, both the master station (10) and the quasi-master station (20) perform other quasi-mastering. the master station only reception operation stop (20) or the master station (10) data request when receiving the (d ₂ or d ₁₎ data request that is transmitted from the own station from the (d ₁ or d ₂₎ means for performing, all該各Ko stations (1 to n) only in a direction in which the data request comes when receiving the data request performs reception of both right and left directions of該回line separately (d ₂ or d ₁₎ Means for transmitting the monitoring data (D) of the own station to each of the slave stations (1 to n) without any trouble in the master station (10) and the quasi-master station (20) even when the line is disconnected due to a failure. ) Is a line monitoring method based on polling, which collects and monitors monitoring data (D _{1 to} D _n ).