JPS5839430B2 - Preliminary switching method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is software for controlling hardware configured with n+1 redundancy, and relates to a backup switching system when the control system hardware has a 2n redundant configuration.

FIG. 1 is a block diagram for explaining a conventional n+1 redundant configuration employed in a D10 type automatic switching system.

In Figure 1, CC is the central processing unit of the automatic exchange, S
RD is a first device that has the function of holding and expanding instructions from the central processing unit, and DV1 to DVn are load devices 5CN1.
~N second devices having the function of driving 5CNo.
5T-Dv is a common spare device of the second device D1 to DVn, 5CN1 to 5CNn is a load device driven by the second device DV, ~DVn or the common spare device 5T-DV, F
F, ~FF are provided corresponding to the second devices DV1 to DVn, and one of the second devices is connected to the common spare device 5T-DV.
TR1 to TRn and tr1 to tro are third devices that have a function of holding a preliminary switching display for switching to
The standby switching relays operated by the standby switching signals from the devices FF, to FFn and their contacts are shown.

Next, when one of the second devices Dv1 to DVn, for example, the n-th second device DVn, is switched to standby and the n-th load device 5CNn is connected to the common standby device 5T-DV. Explain the operation.

2nd device D■ When Dvn among 1 to Dvn is switched as a standby, the corresponding n-th third device FFn is set in advance, and the corresponding standby switching relay T
Ro and its contact trn are in an operating state.

In this state, when driving the first load device 5CN1, the command including the device address of the second device DV1 corresponding to the first load device 5CN1 sent from the central processing unit CC is sent to the first load device 5CN1. It is held and expanded in the device SRD, relayed to the second device DV, and the second device DV1 is
Now, the first load device SCN is driven in accordance with the held and developed command.

Next, when driving the n-th load device, the central processing unit CC does not drive the n-th second device DVn corresponding to the n-th load device, but the common spare device 5T-DV.
A command containing the device address of is sent to the first device SRD.

The first device SRD holds and expands the command in the same manner as above, and relays it to the common spare device 5T-DV.

Since the common spare device 5T-DV has the spare switching relay TR and its contact trn in the operating state in advance, it drives the n-th load device 5CNn, and the common spare device 5T-DV drives the n-th second device DV. , common spare equipment 5T-D
A preliminary switch to V is realized.

However, in the conventional configuration shown in FIG. 1, the second devices DV1 to DVn and the common spare device 5T-DV
and load devices 5CN1 to SCN are installed apart from each other, and if it is necessary to drive the load devices 5CN1 to 5CNn at high speed, the connection line and the load devices 5CN1 to SCN cannot be matched, so the second The devices Dv1 to DVn and the common spare device 5T-DV required a high-performance driver capable of high-speed, high-power driving.

In addition, the second device DV1 to DV, and the corresponding spare switching relay T
R1 to TR are required, which has the disadvantage of being uneconomical.

It is an object of the present invention to eliminate the above-mentioned drawbacks, and to eliminate the conventional standby switching relay without changing the command format of the command containing the device address of the second device sent from the central processing unit. An object of the present invention is to provide an economical standby switching system that allows drivers provided in a device and a common standby unit to be low-performance drivers.

The configuration of the backup switching system of the present invention includes a first device that is connected to the central processing unit and has a function of holding and relaying commands from the central processing unit, a redundant signal bus circuit, and a load device that drives the load device. It is a second device of n sets, which is duplexed with a working system and a standby system, and has a signal bus circuit that connects the first
One is connected to and controlled by the second device and has a device address individually, and the second device is provided with a function to maintain that one of the active systems in the second device is in standby switching. n third devices, and the device address of the second device to be controlled sent from the central processing unit is
If one of the active systems in the n set of second devices is in the middle of a backup switch, one unit is used as a common backup to specify the second device that is in the middle of a backup switch. In the method in which n + 1 units are prepared, the first device receives a command containing the device address of the second device sent from the central processing unit, and if the third device does not have a preliminary switching display, If the redundant signal bus circuit is relayed to the active system of the second device via one side, and the standby switching display is on the third device, the signal is relayed to the active system of the second device via the other side of the duplicated signal bus circuit. When relaying to the backup system, if the backup switching display is on the third device and the device address of the second device specifies common backup in the command from the central processing unit, the device address is , the preliminary switching display from the third device is replaced with a device address converted to the device address of the second device corresponding to the third device, and relayed to the second device. .

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment for explaining the present invention.

In Figure 2, CC is the central processing unit of the automatic switchboard, S
RD is the first device that holds and relays commands from the central processing unit CC, BUo and BU are duplicated signal bus circuits, Dvlo and DV1□ to DVoo and DV
nl is the second device of the duplex n set, and DVlo
-DV, o is the active system, Dv1□ to Dvn1 are the second devices of the backup system, 5CN1 to SCN are the second devices Dv,
.

And the load devices, FF, ~FFn driven by DV1□~Dvoo and Dvnl are the second device Dv1
FIG. 11 shows n third devices that are provided corresponding to O and DV1□ to DVoo and DVn1, and which maintains that one of the second devices is in standby switching.

Then, the device addresses of the second devices Dv1° and DVl, ~Dvno and DVnl to be controlled sent from the central processing unit are the device addresses of the second devices Dv1o and DVl, ~D
n pieces for voo and DVn1 (DV1o and Dvll
Same address as below, D V20 t D V21~
DVoo, DVn.

), if one active system among the n second devices is in backup switching, the second devices Dv1o and D are in backup switching.
One device address is prepared as a common reserve for specifying v11 to DVno and DVl, for a total of n + 1 device addresses.

Furthermore, in FIG. 2, R included in the first device SRD
EG is a register circuit that receives and holds commands from the central processing unit CC, CDo and CD are cable driver circuits that send commands to the redundant signal bus circuits BUo and BUl, and ENC is a register circuit that sends commands from the third device FF1 to FFn. The second devices Dv1o and Dv corresponding to the preliminary switching display of
11~Dvno and DVn, a conversion circuit that converts into the device address, CHG is the third device FF1~FF, by the preliminary switching display from the third device FF1~FF, if there is no preliminary switching display, the first
MAT is a switching control circuit for making the second cable driver circuit CDo and the second cable driver circuit CD1, respectively, in regular use when there is a spare switching indication. SEL is a matching circuit that identifies whether or not the matching signal is present, and generates a match signal if it is for a common reserve.SEL is a match signal from the matching circuit MAT. A selection circuit is shown that selects and sends a device address from the register circuit REG to the cable driver circuit CD1 when there is no match signal.

The operation in such a configuration will be explained.

When there is no preliminary switching display signal from the third devices FF1 to FFn (normal case), the first cable driver circuit CDo is in the normal state under the control of the switching control circuit CHG.
The second cable driver circuit CD1 is in a standby state, and the command including the device address of the second device sent from the central processing unit CC is received and received by the register circuit REG.
After being held, it is sent to the first signal bus circuit BUo via the first cable driver circuit CDo.

On the other hand, a second device DV of the working system is connected to the first signal bus circuit BUo.

~Dvno identifies the device address included in the command on the first signal bus circuit BUo, and in the case of specifying the own device, drives the load device belonging to the own device according to the instruction.

Next, an explanation will be given of the operation when, for example, the n-th FFn of the third devices FF to FFn sends the preliminary switching display to the first device SRD.

Based on the preliminary switching indication from the n-th third device FFn, the switching control circuit CHG switches to the second cable driver circuit C.
D1 is in the normal use state, the first cable driver circuit CDo is in the standby state, and the conversion circuit ENC converts it into the device address of the corresponding n-th second device DVn1 of the standby system and sends it to the selection circuit SEL. ing.

In this state, when an instruction including the device address of the second device is sent from the central processing unit CC, the instruction is received and held in the register circuit REG, and then the device address is sent to the matching circuit MAT and the selection circuit SEL. Sent out.

The matching circuit MAT identifies whether or not the received device address is for common spare use, and if it is for common spare use, the matching circuit MAT sends a matching signal to the selection circuit SEL to identify the central processing unit CC.
The selection circuit SEL selects the device address corresponding to the n-th second device Dvn1 from the conversion circuit ENC instead of the common spare device address from the conversion circuit ENC.

In cases other than common spare use, the matching signal is sent to the selection circuit SEL.
By not sending out the device address from the central processing unit CC, the selection circuit selects the device address from the central processing unit CC.

The device address output from this selection circuit SEL is sent to the second signal bus circuit B via the second cable drive circuit CD1.
Sent to U1.

As a result of the above operation, in the second backup device D■,1 to Dvn1 connected to the second signal bus circuit BU1, the second
The device address included in the command on the signal bus circuit of the device is identified, and if the device is designated, the load device belonging to the device is driven in accordance with the instruction.

In this way, the preliminary switching method of the present invention is realized.

Moreover, the third devices FF1 to FF in the conversion circuit ENC
A second device DV1 corresponding to the preliminary switching indication signal from
o and DVl, ~Dvno and O”DVn.

If a read-only memory is used for conversion into a device address of , there is no need to prepare complicated combinatorial logic using simple functional elements.

In particular, 2/2 of the preliminary switching display signal, which is legally prohibited,
When a protection function and a check function for cases of N or more are added, the conversion function can be realized more economically than combinatorial logic.

As explained above, according to the present invention, by connecting the first device and the second device with a signal bus, the first device prepared from the beginning regardless of the number of load devices in the conventional method can be used. The wiring between the device and the second device, the wiring between the second device and the switching relay contact, and the wiring between the common spare device and the switching relay contact can be eliminated, and there is an advantage that the initial investment can be reduced.

Further, in the present invention, since the second device and the load device can be installed spatially close to each other, a low-performance driver that does not require high-speed, high-power driving can be used for the second device.

In addition, in the conventional system, there are n second devices and one common spare device similar to the second device, for a total of n1,000 devices, but in the present invention, the number of duplicated second devices is 20. The conventional method is more advantageous in terms of the number of devices, but the cost of the conventional method's backup switching relay, n + 1 second devices and common backup device, and the duplication of the present invention. Even when comparing the costs of the second device and the signal bus system, the present invention, which can use the aforementioned low-performance driver, is economically advantageous.

[Brief explanation of the drawing]

Figure 1 shows the n adopted in the conventional DIO type automatic switching machine.
A block diagram showing a +1 redundant configuration. FIG. 2 is a block diagram showing an embodiment for explaining the switching system of the present invention. CC...Central processing unit, SRD...Fourth device, B Uo, B Ul-...- Signal bus circuit, Dvlo, D■11~DV, o, DVn (... ...
・Second device, SCN, ~5CNo...Load device, FF1~FFn...Third device, ENC・
... Conversion circuit.

Claims (1)

[Claims] 1. A first device connected to a central processing unit and having a function of holding and relaying commands from the central processing unit, a duplex signal bus circuit, and a function of driving a load device. , n sets of second devices duplexed into a working system and a standby system, which are connected to and controlled by the first device by a signal bus circuit and each have a device address, and a device corresponding to the second device. n third devices are installed in the second device and have a function of maintaining that one of the active systems in the second device is in standby switching, and the third device to be controlled is sent from the central processing unit. The device address of the second device is n units corresponding to the second device, and if one of the active systems among the n sets of second devices is in the process of backup switching, the device address specifies the second device in the backup switching mode. In a system in which a total of n + 1 devices are prepared as common spares for the If the third device does not have a redundant signal, the redundant signal is relayed to the active system of the second device via one of the redundant signal bus circuits, and if the standby switching display is present in the third device, the redundant signal is When relaying to the backup system of the second device via the other side of the bus circuit, the backup switching display is on the third device, and the device address of the second device specifies common backup in the command from the central processing unit. If so, the device address is replaced with the device address obtained by converting the preliminary switching indication from the third device into the device address of the second device corresponding to the third device, and the device address is sent to the second device. A standby switching method characterized by relaying. 2. The spare according to claim 1, characterized in that a read-only memory is used for conversion to convert the preliminary switching indications from the n third devices into device addresses of the corresponding second devices. Switching method.