JP2616503B2 - Address setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention employs a master-slave control mode, in which a plurality of slave devices are connected to a master device through a common signal line. The present invention relates to an address setting method on a signal line.

[0002] In recent years, the need for long-time continuous operation in information processing systems has become increasingly important. The same applies to the information processing system configured by the above-described inter-device connection method, and as a result, it is possible to add or remove slave devices while the system is operating, that is, to actively add or remove. It is starting to be needed.

[0003]

2. Description of the Related Art FIG. 3 is a diagram for explaining a conventional address setting method between slave devices. The basic method of the address setting method of the slave device in the system using the master-slave type device connection method is disclosed in Japanese Patent Application Laid-Open No. 01-135150, entitled "Network Node Address Setting Method", which was previously filed by the present applicant. Is disclosed. The following is an excerpt from the publication.

In FIG. 3, 1 is a master node, 3 and 3a are common signal lines, 2 is a slave node, 21 and 22 are switches for disconnecting / connecting signal transmission, 24 is a control signal generator, and 26 is an address. 4 shows a setting unit.

Note that FIG.
Although only one configuration is shown, actually, a plurality of similar nodes are sequentially connected. In this address setting method, switches 21 and 22 for disconnecting / connecting signal transmission are provided in common signal lines 3 and 3 a passing through each slave node 2, and one master node 1 is provided with one address of slave node 2. The switches 21 and 22 are brought into contact with each other while the adjacent slave nodes 2 are sequentially connected to the network.

[0006]

The setting of the address is as follows.
This is performed by the master node 1 issuing an “address setting command”. Since the “address setting command” is a command for setting a unique identifier (ID) (address) for each slave node 2, There is no function to select node 2, and each slave node 2 can take in regardless of the address set in slave node 2, and once the address is set, it cannot be set again It is configured as follows.

[0007] If the slave node 2
When an extension or removal work is performed, an address setting is manually instructed to the master node 1 from a system console (not shown), and the above-mentioned “address setting command” is sent from the address setting instructing unit 11 of the master node 1. Is issued and the address is set only once, so that the address in the added slave node 2 can be set.

However, in the conventional method, since the address is manually set, a setting error may occur. Therefore, in order to eliminate the address setting error, in the conventional system, the power supply must be turned on again and a manual re-allocation instruction is required. After the reallocation instruction,
From master node 1 automatically, each slave node 2
For example, addresses are set in order.

Therefore, in the conventional method, since the power supply needs to be turned on again, it has recently become necessary.
There was a problem that active expansion / removal was not possible. SUMMARY OF THE INVENTION In view of the conventional disadvantages described above, the present invention employs a master-slave control mode, and in a system in which a plurality of slave devices are connected to a common signal line with respect to a master device, a system in which active expansion / removal is performed. It is an object of the present invention to provide an address setting method between devices that can set an address correctly even if the above operation is performed.

[0010]

The above problems are solved by an address setting device configured as follows.

[0011]

[0012] A master device 1 and the signal line, respectively provided are an address setting device a plurality of the slave device 2 connected by 3, 3a, address from the slave devices 2
Means 14 for receiving the slave request signal and
How to send an address clear instruction to clear the address
Step 15 and send the address to be set for each slave device 2
The master device 1 and means 11 for, while the the means for delivering an address allocation request signal when the address unassigned state (request signal generation unit 27), and sends the address assignment request signal, the adjacent Means for controlling the signal line with the slave device 2 to be disconnected (switch
21, 22 and control signal generator 24) and means for setting the address transmitted from master device 1 (address setting unit
26), and a means (address clear detection unit 28) for clearing the address of the address setting means (address setting unit 26) by an address clear instruction (address clear instruction unit 15) transmitted from the master device 1 , The master
At least one of the slave devices 2 connected to device 1
If the address becomes unassigned, the slave device
Address allocation request from the address setting device in unit 2
The address clear transmitted by the master device 1 that has received the signal
By receiving an instruction and the address following it,
It is configured to reset the address of the slave device 2 .

[0013]

In the present invention, each slave device is provided with a mechanism for transmitting an address allocation request signal to the master device when an address is not allocated, and a mechanism for clearing an address in accordance with an instruction from the master device.

The master device is provided with a mechanism for detecting an address allocation request signal sent from a slave device and a mechanism for instructing all slave devices to clear an address.

Accordingly, when the slave device is added during the operation of the system and the address allocation request signal is raised due to the address of the added slave device not being set, the master device is For example, after instructing all slave devices to clear addresses, the addresses are reassigned.

In other words, when the operation of adding a slave device is performed while the system is operating, an address allocation request signal is sent from the additional slave device to which no address has been allocated. After clearing, reassign.

If the slave device is removed while the system is operating, some slave devices that do not respond to the call from the master device may occur among the addresses of the slave devices registered when the system is powered on. So
With this as a trigger, the addresses of all slave devices are cleared, and then reassigned.

As another method, when an extension operation of a slave device is performed while the system is operating, an address assignment request signal is sent from an extension slave device to which no address has been assigned. By sensing the addresses of all the slave devices, selecting an arbitrary address from the missing number or the address next to the last address, and setting an address different from the sensed address in the added slave device. You may do so.

If the slave device is removed while the system is operating, some slave devices that do not respond to the call from the master device may occur among the addresses of the slave devices registered when the system is powered on. So, using that as a trigger, the above address is sensed,
You may make it only recognize the missing number of an address.

With the above-described operation, in the present invention, the assignment (including reassignment) of addresses to each slave device is performed in accordance with the addition / removal of the slave device.
This operation can be performed without manual operation such as turning on the power, and an effect of so-called active addition / removal can be obtained.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a diagram showing an embodiment showing the configuration of the present invention, and FIG. 2 is a diagram for explaining the operation when adding / removing a slave device according to the present invention.

In the present invention, each slave device 2 has a request signal generating section 27 for transmitting an address allocation request signal to the master device 1 when an address is not allocated, and an address assignment in accordance with an instruction from the master device 1. An address clear detector 28 for clearing is provided.

The master device 1 also includes a request signal detector 14 for detecting an address allocation request signal sent from the slave device 2 and an address clear instructor 15 for instructing all slave devices 2 to clear the address. Is provided.

When the slave device is added while the system is operating and the address of the added slave device is not set and the address assignment request signal is raised, the master device 1
For example, after instructing all slave devices 2 to clear addresses, until the request signal coming out of all slave devices 2 disappears, the addresses are reassigned in order from the slave device 2 connected in front. Is a means necessary for carrying out the present invention. Note that the same reference numerals indicate the same object throughout the drawings.

The address setting device of the present invention will be described below with reference to FIGS. In the claims, "Address assignment"
Means for sending the attachment request signal '', `` The signal line is disconnected
Control means, address setting means,
The "means for clearing the dress" corresponds to the "request signal" in the following embodiment.
Signal generation means 27 "," switches 21, 22 and control signal generation
Raw section 24, address setting section 26, address clear
A detection unit 28 ". First, in FIG. 1, a slave device 2 is connected to a master device 1 via common signal lines 3, 3a. The master device 1 includes, for example, an address setting instructing unit 11, a response detecting unit 12, an interface unit 13, a request signal detecting unit 14, and an address clear instructing unit 15.

The slave device 2 includes switches 21, 22
And a processing unit 23. In the processing unit 23, for example, a control signal generation unit 24, a transmission / reception interface unit 25, an address setting unit 26, and a request signal generation unit
27 and an address clear detection unit 28.

When the power of the master device 1 and the slave device 2 is turned on, the address of the slave device 2 is not yet allocated. Therefore, in the present invention, an address allocation request signal is generated in the request signal generator 27, The data is transmitted to the master device 1 via the transmission / reception interface unit 25 and the common signal line 3.

When the request signal detecting section 14 detects an address allocation request signal on the common signal line 3 via the interface section 13, the master device 1 sends the slave signal via the common signal line 3 from the address setting instructing section 11. The address is set in the address setting unit 26 of the device 2.

When an address is set in the address setting section 26, the slave device 2 resets the address allocation request signal to the request signal generating section 27 and switches 21 and 22 to the control signal generating section 24. Command "on".

When the switches 21 and 22 are turned on, the common signal line 3 is connected to the signal line 3 a with the adjacent slave device 2. Since an address assignment request signal has been sent from the newly connected adjacent slave device 2 to the master device 1, the master device 1 sets the connected adjacent slave device 2 different from the first slave device 2 described above. Assign another address in the same procedure. Hereinafter, slave device 2
Each time is connected to the common signal line 3, the master device 1
Continue to assign different addresses to each other.

When the master device 1 detects that the slave device 2 connected to the common signal lines 3 and 3a has disappeared and the address assignment request signal has dropped ("OFF"), the address assignment to the slave device 2 is performed. Recognize the end.

Since the master device 1 and the slave device 2 of the present invention operate as described above, in the case shown in FIG. 2, that is, when the address allocation at power-on is completed and the system is operating. The slave device 2 in the state of
Alternatively, an operation when the removal is performed will be described.

In the case of extension, the added slave device 2
In the case of the removal of the address assignment request signal from a, the removal (or the occurrence of a fault), the slave device 2a no longer responds to the call of the master device 1, and all the slave devices Reassign addresses 2 and 2a.

More specifically, in FIG.
Is the slave device 2 to which the address has already been assigned.
The address clear instructing section 15 instructs the address clear detecting section 28 to clear the address.

The slave device 2 includes an address clear detector 2
8 detects the address clear instruction from the master device 1, clears the address set in the address setting unit 26, generates an address allocation request signal from the request signal generation unit 27, and outputs the address allocation request signal from the control signal generation unit 24. Turn off switches 21 and 22.

In the above procedure, all the slave devices 2 are addressed.
In this state, the address is not allocated, and thereafter, the above-described address allocation operation is repeated. For removal, that is the removal, against the specific interrogation command from the master device 1, as a trigger that there is no response from the slave device 2 that is the removal, re-addresses of all slave devices 2,2a Make the assignment. The operation of the reallocation is the same as in the case of the above expansion .

In the above embodiment, the slave device 2
In the case where a is added or removed, the addresses of all the slave devices 2 and 2a are cleared and reassignment is described. For example, the added slave device 2a
In the case of the removal (or failure) of the occurrence of the address assignment request signal from the slave device 2a, the slave device 2a stops responding to the call of the master device 1 and the addresses of all the slave devices 2 and 2a To recognize the missing or last address (for example,
If the slave device 2a in the middle of the cascaded slave device 2 is temporarily removed and connected there by the common signal line 3a, a missing number is obtained, and a new slave device 2b Is installed, the common signal line 3a is temporarily disconnected, so that the
If the address of the slave device 2 on the master device 1 side is the last address from 2b and the slave device 2c is added at the end of the slave device 2 connected in cascade, literally, the slave device at the last position before the expansion 2 is the last address), and the missing address,
Alternatively, by sending the next address of the last address using the above-mentioned address setting command, the address is set in the added slave device 2b or 2c, and the address allocation request signal is sent. As described above, an address different from the address of the existing slave device 2 can be assigned without clearing and reassigning all the slave devices 2, 2a, 2c as described above.

In the case of removal, the removal can be recognized because the address assignment request signal is not recognized or, as described above, there is no response to the call from the master device 1. Only by sensing the addresses of all the slave devices 2 and recognizing the missing numbers, the operation as a system can be continued even if nothing is performed.

When the addresses of all the slave devices 2, 2b, or 2c described above are cleared and reassigned,
Since the address of each slave device 2, 2b, or 2c can be associated with the installation position, there is an advantage that it is convenient to recognize the slave device 2 at the time of failure,
Needless to say, it is not an absolute condition.

In the above active extension / removal work, various pseudo commands may be generated due to noise on the transmission line (S) from the master device 1 due to the connection change of the common signal lines 3 and 3a. Conceivable.

Among the pseudo commands, a sense command,
Although there is no particular problem with the address clear command and the like, for example, when a disconnection command not mentioned in the above-described prior art and the description of the present embodiment occurs, the connection of the common signal lines 3 and 3a is switched. After that, the connected slave device 2 is disconnected, and there is a possibility that a problem may occur that no command can be accepted thereafter.

In this case, in terms of hardware, for example, a circuit for detecting the insertion / removal of the signal lines 3, 3a during the active extension / removal work is provided, and the signal lines 3, 3a are inserted / removed. By detecting this, the input circuit from the master device 1 may be closed to prevent the pseudo command from being input, and the like.

Further, when the operation monitoring mechanism on the system console recognizes that the connection status of the slave device 2 is abnormal, the slave device connected after the place where the addition / removal work was performed is performed. It is possible to return to the initial state by, for example, turning on the power supply again, thereby generating the address allocation request signal, thereby achieving the expected state. Absent.

[0044]

As described in detail above, the present invention
The address setting device has a master-slave control mode, and in a system in which a plurality of slave devices are connected to a common signal line with respect to the master device, a system is used to connect each slave device to an adjacent slave device. Disconnection of the signal line by a control signal in the connected common signal line
A switch unit for making contact, a control signal generating unit for driving the switch unit to a contact state when an address is set, and an address assignment request signal for at least a slave device having an address setting unit when an address is not assigned. the request signal generating unit for delivering the provided system operation
Wherein the master device is the one or more slave devices.
When an address allocation request signal from
Address assignment from one or more slave devices
While the request signal is detected , different addresses are selectively set in the address setting section of each slave device. Therefore, as the number of slave devices increases or decreases, for example, the reallocation of addresses is performed manually. Can be processed without intervention, and there is an effect that active expansion / removal often required recently can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment showing a configuration of the present invention.

FIG. 2 is a diagram for explaining the operation when adding or removing a slave device according to the present invention;

FIG. 3 is a diagram for explaining a conventional address setting method between slave devices.

[Explanation of symbols]

 1 Master node / master device 3,3a Common signal line or common signal line 2 Slave node / slave device 2a, 2b, 2c Slave device added (removed) 11 Address setting instruction unit 12 Response detection unit 13 Interface unit 14 Request signal detector 15 Address clear instructor, 21, 22 Switch 23 Processor 24 Control signal generator 25 Transmit / receive interface 26 Address setting unit 27 Request signal generator 28 Address clear detector Address allocation request signal Address clear instruction

Claims (1)

(57) [Claims] 1. An address setting device provided in each of a plurality of slave devices connected to a master device by a signal line, and receiving an address request signal from each slave device.
Address to clear the address of each slave device.
A means for transmitting a rear instruction and setting for each slave device
To a master device having means for transmitting an address.
Te, means for sending an address allocation request signal when the address unassigned state, sending the address assignment request signal
While being out above, and means for controlling the signal line of the adjacent slave device to the cross-sectional state, means for setting the address transmitted from the master device, the address clear instruction that is transmitted from the master device Means for clearing the address of the address setting means ;
And at least one of the slave devices connected to the master device.
If one of the addresses becomes unassigned, the thread
Address from the address setting device in the slave device
The address clear transmitted by the master device that received the request signal
By receiving an instruction and the address following it,
Address setting apparatus characterized by resetting the address of the over blanking apparatus.