JPS62271538A - Communication switching control system in data way - Google Patents

Abstract

PURPOSE:To attain communication switching without changing slave equipments of many numbers by switching communication station identification of a standby system master equipment into communication station identification for an active system master equipment at a fault of the active system master equipment. CONSTITUTION:A switching supervision controller 12 supervises the state of an active system master equipment 1 and an active system master station 6. If a fault of the active system master equipment 1 or the active system master station 6 is detected, the controller 12 replaces the communication station identification of the master station 6 with that of the standby sysem master station 7. Thus, the communication can be switched without changing the slave equipments having many numbers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication switching control system in a data way communication system.

[Prior Art] In a communication system that performs communication between a master device in a duplex configuration and a plurality of slave devices via a data way, conventionally, as a communication switching control method between an active master device and a standby master device, a slave device There is a known method in which the communication station identification of the master device is stored in the master device, and when the active master device fails, the communication station identification of the master device in the slave device is switched from the active system to the standby system. However, in such a communication switching control system, as the number of slave devices increases, the number of switching mechanisms also increases, so there are problems with reliability, cost, switching speed, and switching synchronization.

[Problems to be Solved by the Invention] This invention solves the above-mentioned conventional drawbacks, provides a highly reliable and low-cost communication switching control method, and provides a communication switching control method that does not require synchronization of switching. With the goal.

[Means for solving the problems] In order to achieve such an objective, in the present invention,
In a communication system that communicates between a master device in a duplex configuration and multiple slave devices via a dataway, when the active master device fails, the communication station identification of the standby master device is changed to the communication station identification of the active master device. The feature is that communication switching is performed by switching to .

[Function] The present invention focuses on the fact that there are more slave devices than master devices, and when switching master devices, it is possible to change the communication station identification of the few master devices to change the slave devices that are large in number. It is possible to perform the 8 admiration without fail.

[Example] Figures 1 to 3 are diagrams showing examples of the present invention,
Figure 1 is a block diagram of the master station and switching supervisory control device to explain switching supervisory control, and Figures 2 and 3 are
Each figure is a system configuration diagram. Arrows in each figure indicate the flow of communication information.

In Figure 2, 1 is the active master device, 2 is the standby master device, 3, 4.5 are slave devices, and 6 is the standby master device.
is the active master station, 7 is the standby master station, 8, 9, and 10 are slave devices, and 1 is the active master station.
1 sits on a common multiplex transmission path (dataway). Each master station 6.7 and slave station 8,
9.10 is connected to Dataway II. 12 is a switching supervisory control device connected to the active master station 6 and the standby master station.

The active master device 1 is the active master station 6.
It is connected to the data way 11 via the slave station 8, 9.10, and communicates with the tape devices 3, 4.5 via the slave stations 8, 9.10. Communication method is 6.7 for each station
, 8, 9, and 10 each have a unique communication station identification, and by specifying the communication station identification, communication is performed between the devices.

As shown in FIG. 1, the reception control unit 6^ of the active master station 6 receives data sent via the data way 11 and sends it to the communication control unit 6B. Communication control unit 8
B is the destination address and identification number memory 6 in the received data
It compares the self-station address (communication station identification) stored in C with the self-station address (communication station identification), and if they match, transfers the received data to the master device. If there is a mismatch, the received data is sent to the data way 11 via the transmission control section 6D.

Further, the communication control unit 6B sends the transmission data from the master device 1 to the dataway via the transmission control unit 60 when the self-stage unit has control over the dataway.

The switching monitoring control device 12 monitors the status of the active master device 1 and the active master station 6. When a failure of the active master device 1 or the active master station 6 is detected, the switching monitoring control device 12 switches the communication station identification of the master station 6 and the communication station identification of the standby master station 7.

Communication station identification will be explained in more detail with reference to FIG.

The communication station identification numbers of the active station 6 and the standby master station 7 are stored in the identification number memory 12A of the switching supervisory control device 12. Switching monitoring control unit 12B
When the active master station 6 or the active master device 1 detects a failure, it sends the communication station identification number of the active master station 6 in the identification number memory 12A to the communication control unit 7B of the standby master station 7, Identification number memory 7 of standby master station 7 (
1 is rewritten. At the same time, identification number memory 7C
The communication station identification number of the standby master station 7 is sent to the communication control unit 8B of the active master station 6 to rewrite the identification number 6C of the active master station 1. This completes the exchange of communication station identification numbers.

There are various methods for detecting a failure. For example, when an abnormality occurs in the master station or master device, the master station or master device reports abnormality detection No. 13 to the switching monitoring control device.

There are also various methods for switching communication station identification numbers.
In the embodiment shown in FIG. 1, the master equipment identification numbers of the active system and standby system are stored in the switching monitoring and control device, but the master stations of the active system and standby system have the master equipment identification numbers of the active system and standby system, respectively. It goes without saying that the configuration may be such that the identification number is stored and the identification number is selected in response to a command from the switching monitoring control device.

FIG. 3 is a diagram showing the system configuration after the switching is completed. Slave stations 8, 9.10 by the method described above
As shown in FIG. 3, the standby master device 2 can now communicate with each slave device as the active master device without performing any operations.

[Effects of the Invention] According to the present invention, since the method of switching the communication station identification between the mask and the equipment side, which is generally small in number, there is no need to switch between a large number of master equipment sides, and highly reliable and low-cost communication is achieved. A switching method is obtained.

[Brief explanation of the drawing]

FIG. 1 is a connection configuration diagram of the active and standby master stations and the switching monitoring control device, FIG. 2 is a connection configuration diagram before the master device is switched, and FIG. 3 is a connection configuration diagram after the master device is switched. 1... Active master device, 2... Standby master device, 3.4.5... Slave device, 6... Active master station, 7... Standby master station, 8.9 .10...Slave station, 11...Data way.

Claims (1)

[Claims] In a communication system that communicates between a master device in a duplex configuration and multiple slave devices via a dataway, when the active master device fails, the communication station identification of the standby master device is changed to the communication station identification of the active master device. A communication switching control method in a data way, characterized in that communication switching is performed by switching to.