JPH0522315A - Loop network system - Google Patents

Abstract

PURPOSE:To transmit a data between optional equipments in the same loop by distinguishing loop interface devices from each other even when the 1st addresses of the loop interface devices connected in the same loop of the loop network system are identical to each other. CONSTITUTION:Each of loop interfaces 2A-2N is provided with a 1st address storage section 24 and a 2nd address storage section 25 storing 1st and 2nd addresses. Moreover, a frame signal from other loop interface device having the same lst address as that of its own equipment is detected and since a copy symbol part is logic '1', the 1st address in duplicate is detected. Then a frame duplicate signal is generated and sent to a loop monitor 1, which generates a 2nd address rewrite signal and the 2nd address of the loop interface devices having the 1st address in duplicate is rewritten into different values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop type network system, and in particular, a loop monitoring device and a plurality of loop interface devices are connected in a loop, and information processing terminals connected to each of the plurality of loop interface devices are connected. Of the information is transmitted through the loop interface device connected in a loop as described above.

[0002]

2. Description of the Related Art A conventional loop type network system, as an example, is shown in a block diagram in FIG.
4N and 4N are connected in series to form one loop, and the loop monitoring device 3 monitors the above-mentioned loop interface device. A terminal device not shown is connected to each of the loop interface devices 4A, 4B, 4C, ..., 4N, and data is exchanged between these terminal devices via a line connecting the loop interface devices described above. Done.

The above-mentioned data is transmitted in a predetermined specific direction. For example, in FIG. 5, data is transmitted counterclockwise. Each of the above-mentioned loop interface devices, when sending data from itself or requesting data transmission to other loop interface devices in the loop, is, for example, a frame having the configuration shown in the explanatory diagram of FIG. 6 as one unit. This is done by sending a signal.

The loop monitor 3 constantly monitors the contents of the frame signal to monitor the operating states of all the loop interface devices 4A, 4B, 4C, ..., 4N in its own loop.

FIG. 6 is an explanatory view showing a configuration example of a frame signal used in a conventional loop type network system, and a part of the frame signal is omitted. PA31 in the figure
Is a preamble and is generated at the beginning of the frame signal. SD32 is a start delimiter, which is a portion indicating the start of the data of the frame signal. DA 33 is an address value of the transmission destination of this frame signal, that is, a destination address portion having a destination address value, and is transmitted to the loop interface device or the loop monitoring device 3 having this destination address value as an address value. .. The loop monitoring device 3 and the loop interface devices 4A to 4N each have an address value.

In FIG. 6, SA 40 is a source address part having an address value of the source, and the device that generates the frame signal and sends the frame signal to other devices in the loop stores the address value of its own device. Insert in this part. INFO
Reference numeral 36 denotes an information section in which information to be transmitted by a frame signal is converted into a predetermined code and inserted.

The ED 37 is a part indicating the end of the data sent by the frame signal by the ending delimiter. FS41
Is a portion showing the state of this frame signal, and is composed of A38, C39, etc., A38 is an address symbol portion, and when this frame signal is generated at the transmission source, the portion of A38 is, for example, logical The value "0" is inserted. Also, the destination address 3 of this frame signal
When the device having the same address as 3 receives it, the part of A38 is rewritten to the logical value "1".

"0" is also inserted in the copy symbol portion of C39 when the frame signal is generated by the transmission source.

It is now assumed that all the devices shown in FIG. 5 have different address values.

The above-described frame signal is generated by the loop interface device 4A. For example, the generated frame signal is sent out with the same address value as the loop interface device 4C has in the destination address section 33. Suppose When this frame signal is first received by the loop interface device 4B, the address value of the destination address part 33 and the source address part 4
The address value of 0 is checked, and the address value of the destination address part 33 and the source address part 40 is different from the address value of its own device.
It is sent to the loop interface device 4C. The loop interface device 4C checks the address value of the destination address part 33 and the value of the source address part 40 to determine the destination address part 3
Since the address value of 3 corresponds to the address value of its own device, and the address value of the source address part 40 is different from the address value of its own device, the address symbol part 38
Is rewritten to "1", then the information content of the information section 36 is copied into the device itself, and finally, the value of the copy symbol section 39 is rewritten to "1", and the frame thus rewritten The signal is sent to the loop interface device 4N. If the address value of the loop interface device 4N and the loop monitoring device 3 is different from the address value of the destination address part 33 of this frame signal, the frame signal returns to the loop interface device 4A which is the transmission source.

The loop interface device 4A checks the value of the source address section 40 of the returned frame signal, and when this address value matches the address value of its own device, erases this frame signal.

[0012]

In the above-mentioned conventional loop type network system, as described above, when the address values of all devices in the same system are different from each other, there is no problem as described above. Information can be transmitted to other devices in the system, however, if there are multiple devices with the same address value in the same system, the frame signal should be transmitted to the intended destination. There are cases where you cannot do it.

That is, in the loop type network system shown in FIG. 5, it is assumed that the address values of the loop interface devices 4A and 4B are equal to each other, and the address of the loop interface device 4C from the loop interface device 4A to the destination address section 33. If a frame signal is sent to a value, that is, to the loop interface device 4C, the value of the source address section 40 in the frame signal of the frame signal is the same as the address value of the loop interface device 4B. When compared, the two values match, so this frame signal is the loop interface device 4B.
In this case, the data is erased and the data cannot be transmitted to the target loop interface device 4C.

When such a situation occurs, conventionally, it takes a long time to search for devices having overlapping address values and to give different address values to each device. have.

An object of the present invention is to provide each loop interface device with a first and a second address value, and use the same address value as the conventional one for the first address value.
A second address value is newly given and placed. When the first address value overlaps with the first address value of another device in the loop, this is automatically detected, and the loop monitoring device is different from each other for the device having the overlapping address. This makes it possible to identify whether the received frame signal is a signal sent from the device itself, unlike the conventional loop type network system of this type, the operator and other people search for overlapping addresses. Another object of the present invention is to provide a loop type network system capable of transmitting data to a target device of the other party without re-assigning different addresses.

[0016]

The loop type network system of the present invention centrally monitors a plurality of loop interface devices connected to different information processing devices and the operating states of these loop interface devices. A loop monitoring device, and these devices are connected to each other in a loop by a transmission line to form a closed loop, and the arbitrary loop interface device or another loop interface device or loop connected to the loop from the loop monitoring device. In a loop type network system for transmitting data using a frame signal as a unit of transmission of one signal with a monitoring device, the loop interface device includes a first address storage unit for storing a first address value, A second address record that stores the address value of 2 When parts and the device itself generates the frame signal to the new, second is stored in the first address storage unit of the destination in the destination address portion of the frame signal 1
Is inserted into the transmission source address part, and the first address value and the second address value of the own device are inserted in a predetermined order to generate a frame signal, which is sent to the transmission line. When the frame signal from another device is received via the transmission line, when a copy generation signal for this frame signal is added, the frame signal in which the copy symbol portion of the frame signal is rewritten to "1" is transmitted. When a frame signal is received from another device through the transmission line, the frame signal is extinguished when a clear signal is added and an overlapping frame generation signal is generated when the overlapping frame generation signal is added to the transmission line. When the frame rewriting signal is added after the frame signal is sent out and the frame signal is received through the transmission line. The second address value is read from the information section of the signal and the frame signal in which this address value is overwritten in the second address storage section and the value of the copy symbol section of the frame signal is rewritten to "1" is the transmission line. When the address symbol rewriting signal is added to the frame signal sent to the frame and received through the transmission line, the value of the address symbol portion in the received frame signal is set to "1".
And a control unit for outputting to the transmission line, and an address value of a source address unit of the frame signal when the frame signal is received via the transmission line and the first unit.
Of the address storage unit and the address value of its own device stored in the second address storage unit, and when they match, the clear signal is generated and output, and the clear signal is added to the control unit. The content of the address symbol part of the frame signal is detected, and if the value is not "1", the address symbol rewrite signal is generated and output to the control part, and the content of the information part of the frame signal is the second address. It is detected whether or not it is a rewriting signal, and if it is the second address rewriting signal, the address rewriting signal is generated only when it is the second address rewriting signal received at the first time, and the control unit And outputs the copy generation signal, and outputs the copy generation signal when the value of the address symbol part is not "1" and the frame signal is not the second address rewriting signal. The value of the address symbol portions "1" is when the value of the address symbol section "1"
Is a second address rewriting signal, and the address rewriting signal is generated and output to the control unit only when the second address rewriting signal is first received, and a copy generation signal is generated to control the control unit. A first frame determination section for outputting the duplicated frame generation signal to the control section and adding it to the control section, and the loop monitoring device erases the received frame signal when a frame clear signal is added, When the replacement generation signal is added, the value of the copy symbol portion is set to "0" and the second address rewriting signal is generated in which the first source address value of the address duplication frame signal is set to the address value of the destination address portion. When the additional address rewrite generation signal is added, the values of the copy symbol section and the address symbol section are set to "0", and the other values are received immediately before the second address. Response rewriting signal, the frame regenerating signal that generates the same frame signal as the response rewriting signal and outputs it to the transmission line, and the content of the frame signal received through the transmission line Is generated and added to the frame generation unit, and the clear signal is generated and added to the frame generation unit. Also, when the received frame signal is the second address rewriting signal, the value of the copy symbol portion is checked and a value is obtained. Is "1", it is configured to include a second frame determination unit that generates the additional address rewriting signal and adds it to the frame generation unit.

[0017]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the loop type network system of the present invention, and FIG. 2 is an explanatory view showing an example of the configuration of a frame signal used in the loop type network system of FIG. 3 is a flow chart showing the operation of the loop interface device shown in FIG. 1, and FIG. 4 is a flow chart showing the operation of the loop monitoring device shown in FIG.

Loop interface devices 2A, 2B, 2
The transmission lines 5 connect C, ..., 2N to the loop monitoring device 1 in a loop. When these devices send data to other devices in the loop, they generate a frame signal based on the configuration shown in FIG. Send in a predetermined direction. In FIG. 1, the transmission direction of the frame signal is counterclockwise.

Loop interface devices 2A, 2B, 2
C, ..., 2N from the first frame input / output unit 21 and the first frame input / output unit 21 that receive the frame signal, output the frame signal to the inside, and send the internally generated frame signal to the transmission line 5. The first frame determination unit 22 that receives the output of the above, detects the content thereof, and outputs various control signals according to the content, and stores the first address value of the own loop interface device given in advance. A frame signal according to a control signal output from the first address storage unit 24, a second address storage unit 25 that similarly stores a second address value given in advance, and a first frame determination unit 22. Is generated and output to the frame input / output unit 21 or accesses the first address storage unit 24 or the second address storage unit 25.

Further, the loop monitoring device 1 has a second frame input / output unit 1 which operates in the same manner as the first frame input / output unit.
2, a second frame determination unit 13 that checks the content of the output signal from the second frame input / output unit and outputs various control signals according to the content, and is output from the second frame determination unit 13. A frame generation unit 1 that generates a frame signal according to a control signal and outputs the frame signal to the second frame input / output unit 12.
4 and.

The loop interface devices 2A-2
A terminal device (not shown) for performing information processing is connected to N, and other devices included in a conventional loop interface device (not shown) are also included in N. It has the same monitoring section that a conventional loop monitoring device does not.

Now, the first of the loop interface device 2A
When the frame signal addressed to the loop interface device 2C is transmitted from the frame input / output unit 21 of the above to the transmission line 5, the control unit 23 in the loop interface device 2A.
2 generates a frame signal having the configuration shown in FIG. 2, that is, a preamble signal of a predetermined format is inserted in the preamble section 31, and a start delimiter signal of a predetermined format is inserted in the start delimiter section 32. , The first address value of the loop interface device 2C is inserted into the destination address part 33, and the first address value of the loop interface device 2A is inserted into the first source address part 34. A second address value of the loop interface device 2A is inserted into the second source address part 35, data to be transmitted is inserted into the information part 36, and an ending delimiter part 37 has a predetermined ending. A frame in which a delimiter signal is inserted and "0" is inserted in the address symbol section 38 and the copy symbol section 39. It generates and outputs the issue. When this frame signal is output to the transmission line 5 via the first frame input / output unit 21 of the loop interface device 2A, the frame signal is first transmitted to the loop interface device 2B.
Is received (step S1 in FIG. 3). The first frame determination unit 22 in the loop interface device 2B extracts the first source address and the second source address value of the received frame signal, and respectively extracts the first address value and the second source address value in the own device. If both of the address values in the received frame signal are equal to the first and second address values in the own device by comparing with the address value of the Control unit 2
The frame signal is sent to the transmission line 3 and is erased by the control unit 23, and is not sent to the transmission line 5 (steps S2 and S3).

If at least one of the two source address values in the received frame signal does not match the address value in the own device, the destination address value in the received frame signal and the first The first frame determination unit 22 checks whether or not the address values of (1) are matched (step S4), and if they are not matched, a control signal for directly sending this frame signal to the transmission line is generated,
In addition to the control unit 23 in the own device, the control unit 23 sends the frame signal as it is to the transmission line 5 via the first frame input / output unit 21 (step S5).

In step S4, when the destination address and the first address value of the own device match, the first frame determination unit 22 causes the address symbol unit 38 in the frame signal.
It is checked whether the value of is "1" (step S6).
When the value of the address symbol part 38 is not "1",
An address symbol rewrite signal for rewriting the value of the address symbol section 38 of the input frame signal to “1” is generated and output to the control section 23. The controller 23 rewrites the value of the address symbol part 38 of the received frame signal to "1" (step S7). Then, the first frame determination unit 2
2 examines the contents of the information part 36 of the received frame signal as to whether or not it is the second address rewriting signal (step S8). If it is the second address rewriting signal, it is further checked whether or not it is the first rewriting signal (step S12). When it is not the first rewrite signal, the control unit 23 is controlled to output a partially rewritten frame signal from the control unit 23 to the transmission line via the first frame input / output unit 21 (step S11). When the result of step S12 is the first rewrite signal, the first frame determination unit 22 controls the control unit 23 to store the second address value of the own device stored in the second address storage unit 25. Is rewritten to the value shown in the information section 36 in the frame signal (step S13), and then the copy generation signal for rewriting the value of the copy symbol section 39 of the input frame signal to "1" is supplied to the control section 23. To the control unit 23, and the control unit 23 controls the control unit 23 to rewrite the content of the copy symbol portion 39 to "1" (step S10), and then executes step S11.

When the frame signal is not the second address rewriting signal in step S8, the first frame determining section 22
Controls the control unit 23 to copy the contents of the information unit 36 of the input signal to a storage unit (not shown) in the loop interface device which has received the frame signal (step S9). Then, steps S10 and S11 are executed.

In step S6, when the value of the address symbol portion 38 of the received frame signal is "1", the first frame determination portion 22 in the loop interface device which has received this frame signal detects that the frame signal Check the contents of the information section 36 (step S1
4) If the content is the second address rewriting signal, the execution proceeds to step S12. If the content is not the second address rewriting signal, the control unit 23 is controlled to store in a storage unit (not shown) in the own device. The contents of this frame signal are copied and the frame signal received via the first frame input / output unit 21 is sent to the transmission line 5 as it is (step S15).

Next, the first frame determination section 22 generates a duplicate frame generation signal and applies it to the control section 23, and controls the control section 23 to give a code indicating the duplicate address to the information section 3.
6 has a predetermined address value indicating a general announcement in the destination address part 33 and the first and second source address parts 34 and 35 respectively have the first address value and the second address value of the own device. Generate an overlapping frame signal with
The signal is sent to the transmission line 5 via the first frame input / output unit 21 (step S16).

Now, when the above-mentioned frame signal having the first address value of the loop interface device 2C in the destination address section 33 is sent from the loop interface device 2A to the loop interface device 2C, the loop interface device 2B first , Receive this frame signal. Both the first address value and the second address value of the loop interface device 2B are the loop interface device 2
If the first address value and the second address value of A are different, the above-described steps S1 and S
2, step S4 and step S5 are executed in this order,
The signal applied to the loop interface device 2B is directly transmitted to the loop interface device 2C.

When the loop interface device 2C receives this frame signal, it executes steps S1 and S2 and then the process proceeds to step S4, where the destination address value in the frame signal matches the first address value of its own device. Therefore, the process of step S7 is performed, and since this signal is not the second address rewriting signal in step S8, steps S9 to S10 and then step S11 are executed to set the value of the copy symbol portion 39 to "1". The rewritten frame signal is transmitted to the transmission line 5.

Here, it is assumed that the loop interface device 2N also has the same first address value as the loop interface device 2C, and the loop interface device 2C.
It is assumed that the first address values other than 1 and 2N have different values. When such a loop interface device 2N receives the above-mentioned frame signal, steps S1 and S2 are executed, and execution proceeds to step S6 at step S4, and then steps S14, S15 and S1.
6 is executed to generate the duplicate frame signal and send it to the transmission line. This overlapping frame signal reaches the loop monitoring device 1.

When the loop monitoring device 1 receives this frame signal via the second frame input / output unit 12 (step S20 in FIG. 4), the second frame determination unit 13 determines that the content is an address duplication frame signal. It is monitored whether or not there is (step S21). If it is an overlapping frame signal, an address rewriting generation signal is generated and the frame generation unit 1
In addition to 4, the frame generation unit 14 is controlled to output the second address rewriting signal to the transmission line 5 via the second frame input / output unit 12 (step S22). Further, the address duplication frame signal received at this time is erased (step S23).

If the content of the frame signal received in step S21 is not the address duplication frame signal, the second frame determination section 13 continues to determine whether the received frame signal is the second address rewriting signal. Is checked (step S24), and if the result is the second address rewriting signal, it is further checked whether the value of the copy symbol portion 39 of this frame signal is "1" (step S2).
5). If the value of the copy symbol portion 39 is "1", the frame generation portion is controlled so that both the value of the copy symbol portion 39 and the value of the address symbol portion 38 are set to "0". The signal is retransmitted (steps S25 and S26). If the value of the copy symbol portion 39 is "0", the received frame signal is erased and the process is terminated (step S27).

When the signal is not the second address rewriting signal in step S24, the first frame judging section 1
3 and the frame generator 14 perform the same processing as a conventional loop monitoring device of this type.

That is, when the first address value is equal in the n loop interface devices, the n-1 times second address rewriting signal is repeatedly sent from the loop monitoring device 1 and these first address values are duplicated. All the second address values of the n loop interface devices are rewritten to have different values.

[0036]

As described above, the loop type network system of the present invention automatically detects a plurality of loop interface devices having the same first address value even in the same loop. , The first overlapping by the second address rewriting signal output from the loop monitoring device
By setting the second address value of the loop interface device having the address value to a different value from each other, it is possible to transmit data between any loop interface device in this loop without any trouble. There is.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a loop network system of the present invention.

FIG. 2 is an explanatory diagram showing an example of a configuration of a frame signal used in the system of FIG.

FIG. 3 is a flowchart illustrating an operation of the loop interface device of FIG.

FIG. 4 is a flowchart illustrating an operation of the loop monitoring device of FIG.

FIG. 5 is a block diagram showing an example of a conventional loop type network system of this type.

6 is an explanatory diagram showing a configuration of a frame signal used in the system of FIG.

[Explanation of symbols]

 1 loop monitoring device 3 loop monitoring device 5 transmission line 12 second frame input / output unit 13 second frame determination unit 14 frame generation unit 2A, 2B, 2C, 2N loop interface device 21 first frame input / output unit 22 second 2 frame determination unit 23 control unit 24 first address storage unit 25 second address storage unit

Claims (1)

Claim: What is claimed is: 1. A plurality of loop interface devices, each of which is connected to a mutually different information processing device, and a loop monitoring device for centrally monitoring the operating states of these loop interface devices. Frame is formed between the loop interface device or the loop monitoring device and the other loop interface device or the loop monitoring device connected in the loop from the arbitrary loop interface device or the loop monitoring device. In a loop type network system for transmitting data by using a signal as a transmission unit of one signal, the loop interface device stores a first address value.
And an address storage unit for storing a second address value
When the address storage unit and its own device newly generate the frame signal, the first address value stored in the first address storage unit of the destination is inserted into the destination address portion of the frame signal and the frame signal is transmitted again. A frame signal in which the first address value and the second address value of the device itself are inserted in the original address part in a predetermined order is generated and transmitted to the transmission line, and another device is also transmitted via the transmission line. When a frame generation signal from the frame signal is received, when a copy generation signal for this frame signal is added, a frame signal in which the copy symbol portion of the frame signal is rewritten to "1" is transmitted, and another frame signal is transmitted via the transmission line. When the clear signal is added when the frame signal is received from the device, the frame signal is extinguished, and when the duplicate frame generation signal is added, the frame signal is duplicated. When a frame signal is generated and sent to the transmission line, and when the frame signal is received via the transmission line, an address rewriting signal is subsequently added to read a second address value from the information part of the frame signal. A frame signal in which an address value is overwritten in the second address storage section and the value of the copy symbol section of the frame signal is rewritten to "1" is sent to the transmission line and received through the transmission line. When an address symbol rewrite signal is applied to the controller, the controller rewrites the value of the address symbol part in the received frame signal to "1" and outputs the value to the transmission line, and the control part via the transmission line. When a frame signal is received, the address value of the source address part of the frame signal, the first address storage part, and the second address The address value of the received frame signal is compared with the address value of its own device stored in the storage unit, and when the address values match, the clear signal is generated and output. Is detected and the value is not "1", the address symbol rewrite signal is generated and output to the control unit, and whether the content of the information portion of the frame signal is the second address rewrite signal is determined. If it is the second address rewriting signal detected and is the second address rewriting signal received at the first time, the address rewriting signal is generated and output to the control unit, and then the copy generation signal is generated. When the value of the address symbol portion is not "1" and the frame signal is not the second address rewriting signal, a copy generation signal is output and the value of the address symbol portion is "1".
When the value of the address symbol part is "1", the information part of the frame signal is checked to generate the second address rewriting signal, and the address rewriting signal is generated only when the second address rewriting signal is first received. A first frame determination unit that outputs a copy generation signal to the control unit, outputs the copy generation signal to the control unit, and generates the duplicate frame generation signal and adds the duplicate frame generation signal to the control unit. When added, the received frame signal is erased, and when the address rewriting generation signal is added, the value of the copy symbol portion is set to "0" and the first source address value of the address overlapping frame signal is set to the address value of the destination address portion. When the second address rewriting signal is generated and the additional address rewriting generating signal is added, the values of the copy symbol portion and the address symbol portion are changed. Check the contents of the frame signal received through the transmission line and a frame generation unit that generates the same frame signal as the second address rewriting signal received immediately before that and outputs it to the transmission line. If it is the address duplication signal, the address rewrite generation signal is generated and applied to the frame generation unit, and the clear signal is generated added to the frame generation unit, and the received frame signal is the second address rewriting signal. When the value of the copy symbol portion is "1" and the value is "1", the additional address rewriting signal is generated and the second frame determining portion is added to the frame generating portion. Loop type network system.