JP2594280B2 - Hot swapping method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] A package in which an individual circuit and a connecting means are mounted, and an opening / closing means for connecting and disconnecting the connection between the individual circuit and the common bus independently of insertion / removal of the package are provided. The influence on the common bus can be eliminated by setting the opening / closing means to the cutoff state before removing the package, and changing the opening / closing means from the cutoff state to the conductive state after inserting the package. The opening / closing means may be a connection package.

[Industrial applications]

The present invention relates to a hot-line insertion / extraction method that enables insertion and removal of a plurality of package-type individual circuits connected to a common bus without affecting other individual circuits.

[Conventional technology]

FIG. 3 is a diagram showing an example of a conventional bus connection system.

In FIG. 3, a signal circuit 11 which is an individual circuit is mounted on a signal package 1 and a bus line 3 which is connected to a bus control unit 2 provided in common to a plurality of signal circuits 11 via a terminal 13. It is connected to the.

Each signal package 1 is provided with a gate circuit 12 in addition to the signal circuit 11, and connects the terminal 13 to the signal circuit 11.

Each gate circuit 12 is connected to a control line 4 that leads to a bus control unit 2 via a terminal 14, and a control signal c transmitted from the bus control unit 2 via the control line 4 is a logical "1".
Is set to a high impedance state with respect to the bus line 3, and the transmission of various signals s via the bus line 3 between the bus control unit 2 and the signal circuit 11 is cut off. When the control signal c transmitted from the bus control unit 2 is set to logic “0”, the bus line 3 becomes conductive, and the bus line is connected between the bus control unit 2 and the signal circuit 11. 3, various signals s can be transmitted.

The bus control unit 2 has terminals 21 and 22 corresponding to the respective signal packages 1, and independently connects the bus line 3 and the control line 4 provided between the respective signal packages 1. I have.

Now, when a failure occurs in the signal circuit 11 transmitting the various signals s to and from the bus control unit 2 via the gate circuit 12 and the bus line 3, the bus control unit 2 sends a signal to the affected signal circuit. 11
Is set to logic "1", and the gate circuit 12 is set to a high impedance state with respect to the bus line 3 to interrupt transmission of various signals s.
The signal package 1 on which the disease signal circuit 11 is mounted is removed.

Also, when the signal circuit 11 is restored and then connected to the bus control unit 2 via the bus line 3 again, the control signal c sent from the bus control unit 2 to the corresponding control unit 4 is set to logic "1". In the set state, the signal package 1 is inserted, the mounted gate circuit 12 is brought into a high impedance state with respect to the bus line 3, and then the control signal c is set to logic “0”. Is made conductive to the bus line 3 so that various signals s can be transmitted between the bus control unit 2 and the signal circuit 11.

However, when inserting or removing the signal package 1,
Since the terminals 13 and 14 are separated from the bus line 3 and the control line 4, respectively, the gate circuit 12 does not always maintain high impedance, and may transmit an interference signal on the bus line 3.

However, since the bus line 3 is provided independently for each signal package 1, an interference signal generated on the bus line 3
There is no possibility that various signals s transmitted between the bus control unit 2 and the other signal packages 1 will be disturbed.

[Problems to be solved by the invention]

As is apparent from the above description, in the conventional bus connection method, each signal package 1 and the bus control unit 2 are connected via independent bus lines 3, respectively.
When any signal package 1 is inserted or removed,
The interference signal generated on the bus line 3 is prevented from interfering with various signals s transmitted via the bus line 3 between the bus control unit 2 and another signal package 1.

As a result, the bus control unit 2 needs to have terminals 21 and 22 for connecting the bus line 3 and the control line 4 to each signal package 1, respectively, and as the number of connected signal packages 1 increases, There is a problem that the number of terminals 21 and 22 also increases.

In particular, when the bus control unit 2 is mounted at high density and the number of terminals provided is limited, the number of signal packages connected to the bus control unit 2 may be limited.

[Means for solving the problem]

FIG. 1 is a diagram showing the principle of the present invention, and FIG.
1 shows the configuration, and FIG. 1 (b) shows the insertion / extraction process.

In FIG. 1, reference numeral 101 denotes an individual circuit, reference numeral 102 denotes connection means, and reference numeral 100 denotes a detachable package on which the individual circuit 101 and the connection means 102 are mounted.

A common bus 6 connects the plurality of individual circuits 101 to each other.

The individual circuit 101 can be connected to the common bus 6 via the connection means 102 by inserting the package 100.

The connection means 102 controls the connection state between the common bus 6 and the individual circuit 101 by a control signal input from the outside with the package 100 inserted.

Reference numeral 200 denotes opening / closing means for setting the connection of the individual circuit 101 to the common bus 6 to a conductive state and a cut-off state independently of insertion / removal of the package.

The opening / closing means 200 connects the individual circuit 101 and the common bus 6 by insertion, and disconnects the individual circuit 101 and the common bus 6 by removal.
And a second package 201 that blocks the communication.

[Action]

When removing the package 100 in the inserted state, step S101: input a control signal to the connection means 102 to set the input impedance to the common bus 6 to a high impedance state.

Step S102: After setting the opening / closing means 200 to the cutoff state, step S103: remove the package 100.

On the other hand, when inserting the package 100 in the withdrawn state, Step S201: Insert the package 100 in a state where the opening / closing means 200 is set to the blocking state, Step S203: Next, send a control signal to the connecting means 102. Input to set the input impedance to the common bus 6 to a high impedance state.

Step S204: Next, the open / close means 200 is set to the conductive state. Step S205: Next, the control signal is input to the connection means 102 to set the individual circuit 101 and the common bus 6 to be connected.

Therefore, when disconnecting or connecting the package 100 from the common bus 6, the connecting means 102 is first set to a high impedance state so that no interference signal is transmitted to the common bus 6, and then the package 100 is inserted. Even if a plurality of individual circuits 101 are connected to the common bus 6 to prevent the signal transmission from interfering with each other even when the plurality of individual circuits 101 are connected to the common bus 6, the pair of common buses is set. , And can be connected to a plurality of individual circuits, and there is no risk of increasing the number of terminals or limiting the number of connectable individual circuits.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Second
FIG. 1 is a diagram showing a bus connection system according to an embodiment of the present invention. The same reference numerals indicate the same objects throughout the drawings.

In FIG. 2, bus connection packages 5 are provided corresponding to the n sets of signal packages 1 respectively.

Each bus connection package 5 is provided with a connection line 51 for connecting the bus line 3, and is terminated by terminals 52 and 53.

The bus lines 3 connected to the terminals 13 of each signal package 1 are not independently connected to the bus control unit 2 but are connected to the corresponding terminals 53 of the bus connection package 5, respectively. The terminal 52 is connected to the common bus 6.

On the other hand, the bus control unit 2 is connected to the common bus 6 by only one set of terminals 23.

Therefore, each signal package 1 is connected to the bus control unit 2 via the bus line 3, the connection line 51 in the bus connection package 5, and the common bus 6.

The bus control unit 2 has terminals 22 corresponding to the respective signal packages 1 and is connected to the terminals 14 of the respective signal packages 1 by independent control lines 4.

The gate circuit 12 provided in each signal package 1 also has a high level with respect to the bus line 3 in accordance with the logical value of the control signal c transmitted from the bus control unit 2 via the control line 4 as described above. It exhibits an impedance state or a conduction state.

Now, the signal package 1 and the corresponding bus connection package 5 are inserted, the control signal c transmitted from the bus control unit 2 onto the corresponding control line 4 is set to logic “0”, and the gate circuit 12 And the signal circuit 11 transmits various signals s to and from the bus control unit 2 via the gate circuit 12, the bus line 3, the connection line 51, and the common bus 6.

In this state, when a failure occurs in the signal circuit 11 and the signal package 1 is removed for repair and separated from the bus control unit 2, first, the signal package 1 is sent out to the corresponding control line 4 from the bus control unit 2. Control signal c is set to logic "1".

As a result, the gate circuit 12 is in a high impedance state with respect to the bus line 3, and cannot transmit various signals s between the signal circuit 11 and the bus control unit 2.

When the corresponding bus connection package 5 is removed in such a state, the bus line 3 connected via the connection line 51 is disconnected.

However, since the signal package 1 is still inserted and the gate circuit 12 maintains a high impedance state with respect to the bus line 3, even when the connection line 51 is disconnected, there is no interference with the common bus 6. No signal is generated.

Subsequently, when the signal package 1 is removed, the control line 4 is also disconnected from the gate circuit 12, so that there is no guarantee that the gate circuit 12 maintains high impedance. However, since the bus line 3 is already disconnected, the signal package 1 is disconnected. , There is no possibility that the signal will be transmitted to the common bus 6.

Next, when the signal circuit 11 mounted on the unplugged signal package 1 is restored and connected to the bus control unit 2 to operate again, the corresponding bus connection package 5 is first removed and placed.

When the signal package 1 is inserted in this state, the terminals 13
Is connected to the common bus 6 because the bus connection package 5 is removed. The terminal 14 is connected to the control line 4 reaching the terminal 22 of the bus control unit 2.

In this state, when the control signal c transmitted from the bus control unit 2 to the control line 4 is set to logic “1”, the signal package 1
In, the gate circuit 12 is set to a high impedance state with respect to the bus line 3.

Subsequently, when the bus connection package 5 is inserted, the terminal 53 is connected to the bus line 3 leading to the signal package 1, and the terminal 52 is connected to the common bus 6. As a result, the terminal 13 of the signal package 1 is connected to the common bus 6 via the bus line 3 and the connection line 51 in the bus connection package 5.

Since the gate circuit 12 in the signal package 1 still maintains a high impedance state with respect to the bus line 3, even when the bus connection package 5 is inserted, any interference signal is transmitted to the common bus 6. There is no danger, and there is no danger that the various signals s transmitted from the other signal package 1 to the bus control unit 2 via the common bus 6 will be disturbed.

In this state, the control signal c transmitted from the bus control unit 2 to the control line 4 leading to the inserted signal package 1 is changed to logic "0".
, The gate circuit 12 becomes conductive with respect to the bus line 3 and between the signal circuit 11 and the bus control unit 2 via the gate circuit 12, the bus line 3, the connection line 51, and the common bus 6. Transmission of various signals s becomes possible.

As is apparent from the above description, according to the present embodiment, when removing the signal package 1, the bus connection package 5 is removed while the signal package 1 and the bus control unit 2 are connected by the control line 4. When the bus line 3 is disconnected first and the signal package 1 is inserted, the signal package 1 is inserted first to connect the bus control unit 2 and the signal package 1 to the control line 4.
Then, the bus connection package 5 is inserted and the bus line 3 is connected.

Therefore, the gate circuit 12 in the signal package 1 is connected to the bus line 3 before the bus line 3 is connected or even after the bus line 3 is disconnected.
Can be set to a high impedance state, and there is no possibility that a disturbing signal is transmitted to the common bus 6,
The bus control unit 2 can be connected to the common bus 6 by only one set of terminals 23.

FIG. 2 is merely an embodiment of the present invention. For example, the package 100 and the individual circuit 101 are not limited to the signal package 1 and the signal circuit 11, respectively, and various other modifications are considered. However, the effect of the present invention does not change in any case.

〔The invention's effect〕

As described above, according to the present invention, when disconnecting or connecting the package from the common bus, first, the connection means is set to a high impedance state, and after no interference signal is transmitted to the common bus, the package is replaced. Since the opening / closing means is set to the conducting state or the blocking state while being inserted, it is possible to prevent the signal transmission from being hindered by the insertion / removal, and to be connectable to a plurality of individual circuits via a set of common buses.
There is no danger of increasing the number of terminals or limiting the number of connectable individual circuits.

[Brief description of the drawings]

FIG. 1 is a diagram showing the principle of the present invention. FIG. 1 (a) shows the configuration, FIG. 1 (b) shows the insertion / removal process, and FIG. 2 shows a bus connection system according to an embodiment of the present invention. FIG. 3 is a diagram showing an example of a conventional bus connection system. In the figure, 1 is a signal package, 2 is a bus control unit, 3
Is a bus line, 4 is a control line, 5 is a bus connection package, 6 is a common bus, 11 is a signal circuit, 12 is a gate circuit, 13, 14, and 21.
Reference numerals 23, 52 and 53 denote terminals, 51 denotes connection lines, 100 denotes a package, 101 denotes an individual circuit, 102 denotes connection means, 200 denotes opening / closing means, and 201 denotes a second package.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shunichi Hidaka 3-9-1, Midoricho, Musashino-shi, Tokyo Nippon Telegraph and Telephone Corporation Telecommunication Network First Research Laboratory (56) References JP-A-61-260342 (JP) , A)

Claims (2)

(57) [Claims] 1. A detachable package (100) on which an individual circuit (101) and a connection means (102) are mounted, wherein the individual circuit (101) is provided with a plurality of packages by inserting the package (100). The individual circuit (101) can be connected to a common bus (6) that connects the individual circuits via the connection means (102), and the connection means (102) is connected to the external device while the package (100) is inserted. A connection state between the common bus (6) and the individual circuit (101) is controlled by a control signal input from the controller, and the common bus of the individual circuit (101) is controlled independently of insertion and removal of the package (100). An opening / closing means (200) for setting the connection to (6) to a conductive state and a cutoff state is provided, and when removing the package (100) in the inserted state, a control signal is input to the connecting means (102). And an input impedance to said common bus (6) After setting the impedance to the high impedance state (S101), and then setting the opening / closing means (200) to the cutoff state (S101).
102), the package (100) is removed (S103), and when the package (100) in the removed state is inserted, the opening / closing means (200) is set to the blocking state (S201). After the package (100) is inserted (S202), a control signal is input to the connection means (102) to set the input impedance to the common bus (6) to a high impedance state (S203), and then the switching means ( 20
0) is set to a conductive state (S204), and then a control signal is input to the connection means (102) to set the individual circuit (101) and the common bus (6) to be connected (S205). A hot-swap method, characterized in that: 2. The opening / closing means (200) connects the individual circuit (101) and the common bus (6) by insertion, and connects the individual circuit (101) and the common bus (6) by removal. 2. The hot-swap method according to claim 1, wherein the second package is a cut-off second package.