JPH01109844A - Monitor control system - Google Patents

Abstract

PURPOSE:To eliminate the waste of duplicated line in a monitor control system by disconnecting or connecting the 1st line based on a polling signal from a master equipment and the 2nd line based on a polling signal from a sub-master equipment. CONSTITUTION:In receiving a data representing a polling through a line 6 and a switch 12, a terminal equipment 4 throws a switch 13 to the position of broken lines and sends a data to the master equipment 2 through the switch 13 and a line 9 from a transmission section 18. The master equipment 2 collecting the data of the terminal equipment 4 sends a data informing the abort of the use of the line. In receiving the data, the sub-master equipment 3 sends a data documenting the use of line to the master equipment 2 to apply polling to a terminal equipment 5. Thus, the data of the terminal equipments 4, 5 is collected in this way and the master equipment 2 and the sub-master equipment 3 send a data to a host monitor control system 1 when they are polled by a host monitor control system 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a monitoring and control system in which the status of devices such as terminal equipment and relay equipment constituting a communication network is managed in an integrated manner by a central station, and in particular, The present invention relates to a bidirectional supervisory control system in which both a device and a submaster device collect supervisory data from a terminal device.

[Conventional technology]

Conventionally, this type of bidirectional supervisory control system has a master device 200 and a submaster device 30 that are polled by a higher-level supervisory control system 100, as shown in FIG.
0, a master device 100 and a sub-master device 200
and separate communication lines 601 to collect information about each other.
．． 602 and communication lines 901, 902, and a plurality of terminal devices 400, 500, . . .
...is connected.

For data collection from terminal devices, both the master device 200 and sub-master device 300 use lines 601 and 602, respectively.
This is carried out by polling via lines 901 and 902. When polled by the higher-level supervisory control system 100, the master device 200 and the sub-master device 300 send the collected data to the higher-level supervisory control system 100, respectively.

[Problem that the invention seeks to solve]

In the conventional supervisory control system described above, in order to enable both the master device 200 and the sub-master device 300 to poll the same terminal device, the master device 200
Two lines 601 and 902 are used to send signals from the side to the submaster device 300, and two lines 602 and 901 are used to send signals from the submaster device 300 to the master device 200. It is provided.

The purpose of the present invention is to eliminate such wasteful line duplication,
An object of the present invention is to provide a supervisory control system capable of reducing system maintenance costs by halving the number of lines.

[Means for solving problems]

The present invention includes an upper-level supervisory control system, a master device and a submaster device each independently connected to this system, and a plurality of terminal devices, and the master device and the submaster device are connected to each other from the master device side to the submaster device. The terminal devices are connected by a first line that transmits signals to the device side and a second line that transmits signals from the submaster device side to the master device side, and the plurality of terminal devices connect multiple lines to these first and second lines. In a drop-connected supervisory control system, each of the terminal devices includes: a first receiving section that receives a signal from the master device through the first line; and a first receiving section that receives a signal from the sub-master device through the second line. a second receiving section that receives signals through a line; a first transmitting section that transmits signals to the master device through the second line; and a second transmitting section that transmits signals to the sub-master device through the first line. and disconnecting or connecting the first line based on a polling signal from the master device, and when the first line is disconnected, transmitting the second transmission unit to the first line on the sub-master device side.
a first switch connected to the line of the submaster; and a first switch that disconnects or connects the second line based on a polling signal from the submaster device, and when the second line is disconnected, connects the first transmitter to the master device. 2nd device side
and a second switch connected to the line.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing this embodiment. This supervisory control system includes an upper supervisory control system 1, a master device 2
, a submaster device 3, and a plurality of terminal devices 4.5 (
The figure shows only two terminal devices as an example. There is. Further, the master device 2 and the sub-master device 3 are connected to a communication line 6 which transmits signals from the data transmitter of the master device 2 to the data receiver of the sub-master device 3 via the switches 12 and 14 described later in each of the terminal devices 4 and 5. . There is. The terminal device 4.5 is connected to these lines in a multi-drop manner.

Each terminal bag W4.5 includes a receiving section 16.20 that receives a signal from the master device 2, a receiving section 19.23 that receives a signal from the sub-master device 3, a transmitting section 1B that sends a signal to the master device 2, 22, and a transmitter 17.21 that sends a signal to the submaster device 3.

Each terminal device 4.5 is also provided with a switch 12.14 for connecting or disconnecting the line 6.7 or line 7.8, respectively, in response to a polling signal from the master device 2. These switches are normally in a state where the line is connected, and when the line is disconnected, the transmitter 17 is connected to the line 7 and the transmitter 21 is connected to the line 8, respectively.

Each terminal device 4.5 is further connected to the line 9.5 by a polling signal from the submaster device 3. IO or line 10.11
Switches 13 and 15 that connect or disconnect the
It is equipped with These switches are normally in a state where the line is connected, and when the line is disconnected, they are in a state where the transmitter 1 is connected to the line 9 and the transmitter 22 is connected to the line yAlO.

Next, the operation of this system will be explained using the operation explanatory diagram shown in FIG.

When the master device 2 collects data from the terminal device 4, the master device 2 first sends data from its data transmission unit to the submaster device 3 declaring that the line will be used from now on (step 1).

The sub-master device 3 has a data receiving section that is similar to the master device 2.
When it receives the data, it notifies the master device 2 of a response indicating that it has abandoned the use of the line through the lines 9, 10.11 and switch 13.15 (step 2). The master device 2 waits for a response from the sub-master device 3 and polls the terminal device 4 (step 3).

When the terminal device 4 receives the data indicating polling through the line 6 and the switch 12 by the receiving section 16, it switches the switch 13 to the broken line side and transmits the data from the transmitting section 18 to the master device 2 through the switch 13 and the line 9. (Step 4). After sending the data, the terminal device 4 switches the switch 13 to the solid line side.

The master device 2, which has collected the data of the terminal device 4, sends data indicating that it has abandoned the use of the line in order to give up the use of the line to the submaster device 3 (step 5).
).

When the submaster device 3 receives this data, it sends data declaring the use of the line to the master device 2 (step 6), and polls the terminal device 5 (step 7).

When the terminal device 5 receives the data indicating polling through the line 11 and the switch 15 by the receiving section 23, it switches the switch 14 to the dotted line side and transmits the data from the transmitting section 21 to the submaster device 3 through the switch 14 and the line 8. (Step 8). After sending the data, the terminal device 5 switches the switch 14 to the solid line side.

The submaster device 3 that collected the data of the terminal device 5 is
In order to yield the use of the line to the master device 2, it sends data indicating that it has abandoned the use of the line (step 9).
).

If the cable breaks or the master device 2 fails, the master device rI! , 2 to the notification of abandonment of use of this line (step 10), the submaster device 3 continues to use the line and polls the terminal device 4 until the response is obtained from the master device 2. (
Step 11). As a result, when the terminal device 4 receives the data indicating polling from the receiving section 19 through the line 10.11 and the switch 13, it switches the switch 12 to the dotted line side, and transmits the data from the transmitting section 17 to the switch 12, the line 7. 8 to the submaster device 3 (
Step 12).

Thereafter, in order to yield the use of the line to the master device 2, the submaster device 3 sends data informing that it has abandoned the use of the line (step 13), and receives data from the master device 2 declaring the use of the line. If you take (
Step 14) Stop using the line.

Then, the master device 2 then polls the terminal device 5 (Step 15), and when the receiving section 20 receives the data indicating polling through the line 6 and the switch 14, the terminal device 5 switches the switch 15 to the dotted line side. Data is sent from the switching and transmitting unit 22 to the master device 2 through the lines 9 and 10 and the switches 13 and 15 (step 16).
. In this way, the data of the terminal device 4.5 is collected by both the master device 2 and the sub-master device 3,
The master device 2 and the sub-master device 3 send the collected data to the host supervisory control system 1 when polled by the host supervisory control system 1 .

〔Effect of the invention〕

As explained above, the present invention includes an upper-level supervisory control system, a master device and a submaster device each independently connected to this system, and a plurality of terminal devices,
The master device and submaster device are connected by a first line that transmits signals from the master device side to the submaster device side, and a second line that transmits signals from the submaster device side to the master device side, and connects multiple terminals. In a supervisory control system in which devices are multi-drop connected to these first and second lines, each of the terminal devices includes a first receiving section that receives a signal from the master device through the first line, and a sub-master device. a second receiving section that receives a signal from the master device through a second line;
a first transmitter that transmits a signal through the first line to the submaster device; a second transmitter that transmits the signal to the submaster device through the first line; and a second transmitter that disconnects or connects the first line based on a polling signal from the master device. , when the first line is disconnected, the second
a first switch that connects the transmitting section of the transmitter to the first line on the submaster device side, and disconnects or connects the second line based on a polling signal from the submaster device; The first transmitter is connected to the second transmitter on the master device side.
and a second switch connected to the line.

Therefore, according to the present invention, it is possible to realize a supervisory control system that eliminates the waste of line duplication in conventional supervisory control systems, reduces the number of lines by half, and reduces system maintenance costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the embodiment of FIG. 1, and FIG. 3 is a block diagram showing a conventional supervisory control system. 1... Upper supervisory control system 2... Master device 3... Submaster device 4.5... Terminal devices 6 to 11... Communication lines 12 to 15... Switches 24, 25... Communication Line Agent Patent Attorney Yoshiyuki Iwasa

Claims (1)

[Claims] (1) A supervising control system, a master device and a sub-master device each independently connected to this system, and a plurality of terminal devices; The terminal devices are connected by a first line that transmits signals from the submaster device side to the master device side, and a second line that transmits signals from the submaster device side to the master device side, and the plurality of terminal devices connect to these first and second lines by multi-drop. In the connected supervisory control system, each of the terminal devices includes: a first receiving section that receives a signal from the master device through the first line; and a first receiver that receives a signal from the sub-master device through the second line. a second receiving section that transmits a signal to the master device through the second line; a second transmitting section that transmits a signal to the sub-master device through the first line. and disconnecting or connecting the first line based on a polling signal from the master device, and when the first line is disconnected, transmitting the second transmitter to the first line on the sub-master device side.
a first switch connected to the line of the submaster; and a first switch that disconnects or connects the second line based on a polling signal from the submaster device, and when the second line is disconnected, connects the first transmitter to the master device. 2nd device side
A supervisory control system comprising: a second switch connected to a line.