JP3089099B2 - Circuit switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit switching device in which a plurality of relays for switching circuit branches are sequentially driven in the same direction.

In an online system, a public line or a dedicated line is used for data communication between information processing apparatuses.
When an abnormality occurs in the data communication line, the data communication is interrupted, and the processing of the information processing device cannot be continued.

Therefore, another data communication line is prepared for backup, and the line in operation is switched to a spare data communication line by using this kind of device when an abnormality occurs.

[0004]

2. Description of the Related Art FIG. 7 illustrates the configuration of an online system. A line switching device (circuit switching device) 704 is connected to a line 702 drawn from an information processing device 700.

[0005] Also, the line switching device 704 sends the current line 7
06 and a protection line 708 are drawn out, and another information processing device 710 is connected to these lines 704 and 706.

FIG. 8 illustrates the configuration of the line switching device 704. Each signal line of the lines 702, 706, and 708 (seven lines in FIG. This) has a plurality of switching relays 10-1, 10-
2,10-3,10-4,10-5,10-6,10-
7 is connected.

These relays 10-1, 10-2, 10
As -3, 10-4, 10-5, 10-6, and 10-7, a latching relay capable of self-holding the state of the switching contact regardless of whether or not the power is turned on is used.
The signal line 02 is connected to the corresponding signal line of the line 706 or 708 and the relays 10-1, 10-2, 10-3, 10-.
4, 10-5, 10-6, and 10-7.

Further, relays 10-1, 10-2, 10
-3, 10-4, 10-5, 10-6, and 10-7 are switched and driven by a relay control circuit 900, and the driving thereof is performed by a higher
This is performed when the switching of 6,708 is requested.

The switching of the lines 706 and 708 is requested when an abnormality occurs in the working line 706 or when the abnormality is recovered, and the relays 10-1, 10-2, 10-3, 1
0-4, 10-5, 10-6, and 10-7 are sequentially switched and driven in the same direction at fixed time intervals.

FIG. 9 shows relays 10-1, 10-2, 10
The switching timing of -3, 10-4, 10-5, 10-6, and 10-7 is described. In FIG.
0-1, 10-2, 10-3, 10-4, 10-5, 1
These are sequentially driven in the order of 0-6, 10-7.

In this case, the drive current is increased by several tens mA each time the switching operation is performed, so that the relays 10-1, 10-2, 10-3, 10-
A drive current is supplied to 4, 10-5, 10-6, and 10-7, so that a large current is prevented from flowing.

Therefore, all the relays 10-1 and 10-
2,10-3,10-4,10-5,10-6,10-
7 is switched in the same direction to reliably switch the working line 706 and the protection line 708.

[0013]

SUMMARY OF THE INVENTION Relays 10-1 and 10
-2,10-3,10-4,10-5,10-6,10
-7 self-holds the state of the line switching contact, so that these relays 10-1, 10-2, 10-3, 10-4, 10
When the power of the line switching device 704 is cut off due to an accident during the switching drive of -5, 10-6, and 10-7, a part of the signal line of the line 702 is partially used when the power is turned on again.
Then, the others are kept connected to the protection line 708.

Therefore, even when both of the lines 706 and 708 are normal, the information processing devices 700 and 710 cannot perform data communication, and therefore, it is possible to immediately resume the operation of the system. It will be difficult.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a device which can always set all relays to a correct circuit switching state at power-on or reset. It is in.

[0016]

In order to achieve the above-mentioned object, an apparatus according to the present invention is configured as shown in FIG. 1, and the apparatus shown in FIG. Switching relays 10-0, 10-1, 10-2,...
10-N and one of the relays 10-0 serving as a switching reference.
Relay switching means 12 for switching driving in the direction of request when circuit switching is requested, and other relays 10-1, 10-2,... When the reference relay 10-0 is driven for switching.
.. first relay sequential switching means 14 for sequentially switching and driving the 10-N circuit switching contacts in the same direction as the reference relay 10-0, and switching of the reference when a reset or power-on is confirmed Reference relay reading means 16 for reading the state of the circuit switching contact from relay 10-0, and other relays 10-1, 10-2... 1 in the direction indicated by the reading result.
Second relay sequential switching means 18 for sequentially switching and driving the 0-N circuit switching contacts.

[0017]

According to the present invention, the relay 10-0 in which the circuit switching contact is driven first is replaced with the other switching relays 10-0, 10-1,.
10-2... 10-N.
When power on or reset is confirmed, the reference relay 1
In the same direction as 0-0, the other relays 10-0, 10-1,
.. 10-N are switched.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a line switching device (circuit switching device) according to the present invention will be described below with reference to the drawings.

FIG. 2 illustrates the configuration of the line switching device 704. In FIG. 2, the relays 10-1 and 10-
2,10-3,10-4,10-5,10-6,10-
7, a relay 10-0 is prepared (although it may be newly added, an unused relay can be used for line switching).

The switching contact of the relay 10-0 is connected to the line 70
6,708 signal lines are relays 10-1, 10-2, 1
0-3, 10-4, 10-5, 10-6, and 10-7.
When resetting and power-on of the relay 04, the relays 10-1, 10-2, 1 move in the same direction as the switching contact of the relay 10-0.
The switching contacts 0-3, 10-4, 10-5, 10-6, and 10-7 are sequentially driven by the relay control circuit 900 in this order.

FIG. 3 illustrates the configuration of the relay control circuit 900. A line switching request (a switching request for the lines 706 and 708) sent by the information processing device 700 is given to the MPU 302 via the communication control circuit 300.

When this line switching request is given, the MPU
The output of the address decoder 304 is given to the address recorder 304, and the output of the address decoder 304 is
0, 306-1, 306-2, 306-3, 306-
4, 304-5, 304-6, and 304-7 are sequentially transmitted as relay switching instructions.

As a result, the relays 10-0, 10-1, 1
0-2,10-3,10-4,10-5,10-6,1
These switching contacts are connected to the switching register 306- in the order of 0-7.
0, 306-1, 306-2, 306-3, 306-
4, 304-5, 304-6, and 304-7 are sequentially driven.

In FIG. 4A, the configuration of the relay 10-0 is as follows.
Also, in FIG. 1B, the relays 10-1, 10-2, 10
-3, 10-4, 10-5, 10-6, and 10-7 are described, and each relay 10-0, 10-1,.
10-2, 10-3, 10-4, 10-5, 10-6
The switching contact 10-7 is driven by controlling the energization of the coil 400.

In FIG. 5, the operation of the present embodiment is described with reference to a flowchart. When the line switching device 704 is reset or the power is turned on, the instruction to read the contact state is sent to the address decoder 304. The state of the switching contact in the relay 10-0, which is used as a switching reference, is read from the driver 310 (see FIG. 4) and read by the MPU 302 (step 500).

After the count value i for specifying the relay is set to 1 (step 502), the relays 10-1, 10-2, 10-3, 10-4,
The energization of the coil 400 of 10-5, 10-6 or 10-7 is controlled, and its switching contact is driven in the same direction as the relay 10-0 (step 504).

Next, the value i is incremented (step 506), and the relays 10-1, 10-2, 10-3, 10
A process (step 508) of determining whether or not all the contact switching of −4, 10-5, 10-6, and 10-7 has been completed is performed based on the incremented value i.

At this time, the relays 10-1, 10-2, 1
When it is confirmed that the switching of 0-3, 10-4, 10-5, 10-6, and 10-7 has not been completed (NO in step 508), the next relay 10-indicated by the value i is determined.
2,10-3,10-4,10-5,10-6,10-
The contact 7 is switched (step 504).

As a result, the value i (= 1, 2, 3, 4, 5,
6, 10), relays 10-1, 10-2, 10-3, 10
-4,10-5,10-6,10-7 are specified in order,
These switching contacts are sequentially driven in the same direction as the reference relay 10-0.

Then, the relays 10-1, 10-2, 10-
When all the contacts of 3, 10-4, 10-5, 10-6, and 10-7 are driven (YES in step 508), normal operation is started (step 510), and whether or not a line switching request has been received is determined. The occurrence of power interruption is monitored (step 51).
2,516).

If it is confirmed that the line switching request has been received during the normal operation (YES in step 512), the count value i is reset to zero (step 518).
Relays 10-0, 10-1, 10-2, 10 indicated by the value i
The energization of the coil 400 of -3, 10-4, 10-5, 10-6 or 10-7 is controlled, and its switching contact is switched to the required direction (step 504).

Further, the value i is incremented (step 506), and the relays 10-0, 10-1, 10-2,
It is determined from the value i after the increment whether or not all the switching of 10-3, 10-4, 10-5, 10-6, and 10-7 has been completed (step 508), and it is confirmed that the switching of all the relays has been completed. If not (NO in step 508),
The next relay 10-1, 10-2, 10-3 indicated by the value i,
10-4, 10-5, 10-6 or 10-7 is driven (step 504).

As described above, after the switching contact of the relay 10-0 is switched in the required direction, the relays 10-1, 10
-2,10-3,10-4,10-5,10-6,10
The -7 switching contact is also sequentially switched in this order in the same direction as the relay 10-0.

If the line switching device 704 is abruptly reset during the successive switching, or if the power of the line switching device 704 is cut off due to an accident, each signal line of the line 702 is reset after resetting or turning on the power again. Working line 706 or protection line 7 that was connected before reset or before power-off
08 and corresponding signal lines as described above (steps 500, 502, 504, 50).
6,508).

Therefore, according to the present embodiment, the information processing apparatuses 700 and 710 can always resume data communication in the same line state immediately before reset or power-off, so that unexpected reset during relay switching or power supply during the switching can be performed. The system can be started normally without being affected by the accident.

[0036]

As described above, according to the present invention, the circuit switching contacts of all the other relays are the same as the reference relay at the time of power-on or reset, based on the relay whose circuit switching contact is driven first. , It is possible to construct a system with high reliability against power interruption or unexpected reset during successive relay switching.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an overall configuration diagram of an embodiment.

FIG. 3 is an explanatory diagram of a configuration of a relay control circuit in the embodiment.

FIG. 4 is an explanatory diagram of a configuration of a switching relay.

FIG. 5 is a flowchart illustrating the operation of the embodiment.

FIG. 6 is a time chart for explaining the operation of the embodiment.

FIG. 7 is an explanatory diagram of a configuration of an online system.

FIG. 8 is a configuration explanatory view of a conventional example.

FIG. 9 is a time chart for explaining the operation of the conventional example.

[Explanation of symbols]

 10-0 Switching reference relay 10-1 to 10-7 Relay 300 Communication control circuit 302 MPU 304 Address decoder 306-0 to 306-7 Switching register 310 Driver 400 Coil 700 Information processing device 702 Line 704 Line switching device 706 Working line 708 protection line 710 information processing device 900 relay control circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/48 H04L 29/14 G06F 13/00 353

Claims (1)

(57) [Claims] A plurality of switching relays (10-0, 10-1, 10-2,..., 1) which self-hold the state of a circuit switching contact.
0-N), a reference relay switching means (12) that switches and drives one of the relays (10-0) serving as a switching reference in the requested direction when circuit switching is requested, and a reference relay (10-N). 0-) is switched and the circuit switching contacts of the other relays (10-1, 10-2 ... 10-N) are sequentially switched and driven in the same direction as the reference relay (10-0). Reference relay reading means (16) for reading a state of a circuit switching contact from a reference switching relay (10-0) when reset or power-on is confirmed; The other relays (10-1, 1
0-2... 10-N), and a second relay sequential switching means (18) for sequentially switching and driving the circuit switching contacts.