JPS6022849A - Method for setting automatically address in transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention is configured such that signals are transmitted in a sequential manner.

This invention relates to an automatic address setting method in an information transmission system between a plurality of devices.

[Background of the invention]

To explain the loop network as a typical configuration,
A loop network basically consists of one line arranged in a loop,
It is an extremely simple configuration with several nodes (a type of exchange) placed at arbitrary positions on the loop. Since this loop network is susceptible to node failures and line failures, a system with duplicated loops, as shown in FIG. 1, has recently been developed. In this system, both loops 1.2 are connected to the same node N8. N2. N3. In order to prevent the system from going down even if it is divided between N4, both loops 1.2
The transmission direction of each node N, , N2 . N3. N
4 has a loopback function. For example, the first
As shown in the figure, loops are made to loop between both loops at nodes N, , N2 before and after the divided point.

Traditionally, node failures and line failures have been detected by sending a loop check message with the address of the node to be looped back to the transmission path, and checking whether the message loops back at that node and returns. I was doing it. In addition, the system that the applicant previously applied for (
Japanese Patent Application No. 54-115300) proposes a method of sending a loop check message with its own address added to the transmission line, and checking whether it loops back at an adjacent node or not (hereinafter referred to as "small loop check"). It was carried out by (named).

That is, both of the above two failure detection methods require an address. However, there are cases where the node address is not available, such as when a new node is added, or when the node recovers after a failure but the node address has been deleted. In such cases, a person would check what the address of the node is, decide to check this node so that it does not overlap, and then perform a loop check.

That is, the two failure detection methods described above require additional nodes,
There are problems such as loop checking cannot be performed unless the address of the recovery node is set.

[Purpose of the invention]

The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide an automatic address setting method in a sequential transmission system.

[Summary of the Invention J] Therefore, in a transmission system that transmits signals sequentially between a plurality of devices, when each device has its own address undetermined, the present invention provides a method for setting a self-address in the transmission system. A step of transmitting a message with an automatic address that is sequentially transmitted to the connected devices, and when the message is received, it adds its own address to the message, and if the address is undetermined, an undetermined code is added, and the message is sent in sequence. forming an address string in the message, and forming an identical circular address string pattern in which the address strings in the message are adjacent when the message passes through the transmission system at least twice and returns.
The present invention is characterized in that it includes the step of setting an address different from an established address in the atray column as its own address.

[Embodiments of the invention]

The present invention will be explained below based on Examples.

The loop transmission system shown in FIG. 2 has a loop 1 that transmits data in a long-time clockwise direction and a loop 2 that transmits data in a clockwise direction. , 13 are connected to the loop 2, and transmission control devices 21, 22.degree. 23, which form pairs with these devices 11, 12.degree. 13, are connected to the loop 2. Each pair of devices 11, 21, 12, 22, 13, and 33 corresponds to the above-mentioned nodes, and detour transmission paths 100, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 21, 21, 22, 13, 33 correspond to the aforementioned nodes, respectively. ．． 300, and lines 311 to 31, 3, and 32 capable of bidirectionally transmitting data to the transmitting/receiving terminals 3], 32, and 33, respectively.
1 to 323. Transmitting/receiving terminals 31, 3
2.33, when devices 11.12, 1.3 and loop 1 are normal, only the stiff devices 11 to I3 and loop I are used to exchange data with each other. Device 11-1
3. If there is a failure in any of the loops I, these terminals 31 to 33 will switch to devices 21 to 23 depending on the location of the failure.
, detour transmission line 100, 200° 300 and loop 2
data is exchanged mutually using

For this reason, the transmission control devices 11, 12, and 13.

During normal operation, data is sent on loop 1, and
When there is an abnormality in the function of receiving data on loop 1 and the transmission system of loop 1, detour routes 100 and 2 are used, respectively.
00, 300, and also has the function of receiving data on this detour route.

FIG. 3 shows internal circuit blocks of the transmission control device 11. The six devices 11, which have the same structure as the other transmission control devices, include an interface 51 that exchanges data with the loop 1, an interface 61 that exchanges data with the detour transmission Plloo and the line 311, and these interfaces. 51 and 61 respectively for storing messages received from loop 1 and detour transmission line 00. Second receive buffer 71°7
3, a sender 81 for temporarily storing messages sent from the terminal 31 until they are sent, and a processing device 41 for controlling the sending and receiving of these messages.
and timers 90-92 and registers 93-95,
It has a timer 96 and registers 97-98. Portions of the transmission control device 11 other than the interfaces 51 and 61 are realized by a microcomputer.

FIG. 4 is a detailed block diagram of the interface 51.

The interface 61 consists of two sets having exactly the same configuration as shown in FIG. Of the interface 61, line 31
Each part of the set connected to 1 will be indicated by adding a prime (') to the reference symbol of the corresponding part in FIG. The remaining parts of the interface 61 connected to the line 100 will be indicated by adding a prime to the corresponding reference symbol of each part in FIG.

First, the transmission operation will be described by taking as an example a case where a message stored in the transmission buffer 81 is transmitted to the loop 1 via the interface 51.

When the processing device 41 detects that there is a message to be transmitted in the transmission buffer 81, as shown in FIG.
The first eight pins 1- of the message to be sent are input to the register 59 in the interface 51 via the line 59A, and the counter 60 is reset via the @60A.

The 8-bit data in register 59 is processed by the clock generator (
CLK) 58, is serially output, sent to the transmitter 53, and output to the loop 1.

The counter 60 is a 3-bit counter that counts the output of CLK5B, and when it counts 8 bits of tally, it outputs an overflow signal to the line 60B'2.

In response to this overflow signal, processing unit 41 sends the next eight bits of the message to be sent in transmission buffer 81 to register 59. By repeating this operation, a message of a predetermined length can be sent to loop 1. In this way, the message to be transmitted in the transmission buffer 81 can be transmitted.

Next, the reception operation will be explained using an example in which a message from the loop transmission path 1 is received via the interface 51. When the message sent from the transmission control device 11 reaches the receiver 52 of the device 12 shown in FIG.
A synchronization signal detector 54 detects the pit sequence of this received message and outputs a synchronization signal synchronized with each bit of this pit sequence. The data received by the receiver 52 is stored in an 8-bit register 56 in synchronization with this synchronization signal. Counter 55 is a 3-bit counter, and when it counts eight synchronizing signals, it outputs an overblow signal onto line 55A. Processing device 4 in device 12
1 register 56 in response to this overflow signal.
The first receiving buffer 71 receives each message in 8 bits.
Store in.

The same applies to transmission and reception operations via the interface 61.

Next, when several new transmission control devices are added, a method for automatically setting addresses to these transmission control devices will be described. FIG. 7 shows a loop transmission line 1 on the outside of the transmission line similar to that in FIG.
In addition to 1 to 16, new transmission control equipment [17, 18,
19 has been added.

Now, the case where a signal is emitted from the device 12 will be explained.

The processing device 41 of the device 12 performs a large loop (loop 1 or 2).
) The message shown in FIG. 5 having the address SA (source address) of the communicable function code FC1 device 12 is sent to loop 1.

This message returns to device 12, which has completed loop 1.

Based on the address SA of this message, the device 12 detects that it is a self-originated message and does not retransmit this message. Of the transmission control devices on loop 1,
Devices 13, 14゜15, 16, 11 have 0 in register 98
Since a predetermined address is set, this message is simply relayed. The value of register 98 of newly added device 17.18.19 is 0. The equipment [17, 18, 19] not only relays this message, but also transmits a function code FC representing automatic address setting under the condition that the value of register 98 is 0 and this message is received. Send the message shown in the ε diagram. For example, when this address automatic setting message is sent from the device]7 to the device J3, the device 13 inserts the address of the device 14 stored in the register 98 as data D between the function code FC and the error detection data FC8. An address automatic setting message to which the address 1114++ is added is sent to the adjacent device 18. The device 18 is
Adding the address ``'O'' of device 18, device 1
Send to 4.

In this way, an automatic address setting message is sent using the added devices 17, 18, and 19 as the sender. First, the devices 17, 18, and 19 execute the following process to detect whether the address automatic setting message is spontaneous (rJ). The data part of the setting message is as follows: ■15.16,11..!0.o <1st reception) for those sent from device 19
■15,16. '11,20,0,1'3,0,14°0.15,16,11,12. O (second reception), and the device 18 is the source ■14, 0, 15, 16, 11, 12, 0 (first reception) ■14, 0, 15, 16, 11, 12,0,13゜0.
14,0,15,16,11,12,0 (second reception) and the source is device 17■13,0,14,0,15,16,11,12゜0(
1st reception) ■13, 0, 14, 0, 15, 16, 11, 12゜0.
13,0,14,0,15,16,11°12.0 (second reception). Therefore, in order to detect a self-originated address automatic setting message, it is sufficient to compare the first half and the second half of the number string in the data section of the received message and detect those that are exactly the same.

In this way, the front 44 parts and the latter part of the items 1 to 2 are not the same, and only the item 2 is the same, and this can be detected.

Specifically, each transmission control device performs the following steps.

(1) When the address automatic setting message is received, if the address value is not //017, the register 98
Add this address value to the part corresponding to the data part of this message and send it.

(2) If this address value is '0'', add 110 II to the data section of this message, create a new message, and execute the next process (3).

(3) Count the number of at Opps in this data section, and if the number is odd, send the message created in process (2) to transmission line 1.

(4) When the number is even, when the number of at On is N, the N/2nd I from the first address value of the data section
The address string up to IOH (called the first half) and this N
Compare the address strings (referred to as the second half) from the next address value of 'O'' at 7/2@th @ to the last address value 0, and if these address strings are the same, perform the next process (6). If there is a difference, perform the next process (5).

(5) At this time, send the message created in process (2).

(6) This message is determined to be a self-originated address automatic setting message, and the process moves to the next address setting process. The message created in process (2) is not sent.

(7) Address determination process (7-1) If there is one tl OIt in the first half, the value obtained by adding '1'' to the maximum address value in the first half is set as the address of this transmission control device in the register 98. Set to .

(7-2) If there are 2 or more '0'' in the first half, this II
Compare the address immediately before 071 and detect that the address immediately before the last pa 0'' in this first half is the Nth smallest (or largest). If the beginning of the first half is rt OH , this rt O, , actually does not have the previous address, but the previous address of this tl O'1 is the next largest address of the last 0'' in the first half. tentatively decided.

When there are two or more “o” characters in a row, the I′O to be noted is
The address corresponding to n is tentatively determined to be the next largest address after the address corresponding to '0'' immediately before it.

Device added in this way 17゜ 18.19, respectively N. Only one can decide.

(7-3) II N I to the maximum address value in the first half
The value obtained by adding F is set in the register 98 as the address of this transmission control device.

It goes without saying that the automatic address setting method described above is not limited to loop-shaped transmission lines, but can be applied to general systems in which signals are transmitted in a circular manner.

〔Effect of the invention〕

As described above, according to the present invention, the address of an added transmission control device can be automatically set.

Additionally, addresses can be automatically set for transmission control equipment that has recovered from a failure but lost its address during that time, and can be applied to general sequential transmission systems where addresses have not yet been determined. It has the effect of

[Brief explanation of drawings]

Figure 1 is a schematic block diagram of a conventional loop transmission system.
FIG. 2 is a schematic block diagram of a loop transmission system according to the present invention, FIG. 3 is a more detailed block diagram of a transmission control device used in the system of FIG. 2, and FIG. 4 is a diagram of an interface 5.
1 is a more detailed block diagram, FIG. 5 is a diagram showing the format of the message to be transmitted, FIG. 6 is a diagram showing the message format 1, and FIG. 7 is a loop transmission including the newly added transmission control device. A schematic block diagram of the system, FIG. 8, is a diagram showing the format of a message. 1.2...Loop, 11-19.21-26...Transmission control device, 31...Transmission/reception terminal, 41...Processing device, 51.61...Interface, 71...First
Reception buffer, 73...Second reception buffer, 81...
・Transmission buffer, 90-92...timer, 93...
A register for indicating that the small loop check request has been accepted, 94... A register for indicating that the small loop check has been completed, 95... A register for indicating the small loop check result, 100, 200, 300. ...Detour transmission line. Figure 1/V, N4 Release Figure 2/

Claims (1)

[Claims] 1. In a transmission system that sequentially transmits signals among a plurality of devices, when each device has its own address undetermined, a device coupled to the transmission system to set its own address. a step of transmitting a message with an automatic address that is sequentially transmitted to the message, and when the message is received, it adds its own address to the message, and when the address is undetermined, an undetermined code is added, and an address string is sequentially written in the message. and when the message goes around the transmission system at least twice and returns, when the address string in the message includes at least two adjacent identical circular address string patterns, 1. An address automatic setting method in a transmission system, comprising the step of setting an address different from the address of the user as its own address. 2. In the method according to claim 1, the maximum value of determined addresses in the two adjacent same circular address buttons is detected, and the number N of devices whose addresses are undetermined among the plurality of devices is determined. The step of setting the calculated value as its own address, and when −>1, comparing each address adjacent in the signal transmission direction to each address undetermined code in the address string in the message, and calculating the size of the adjacent address. An automatic address setting method in a transmission system, comprising the step of setting the value obtained by adding the maximum value to the number indicating the order as the address of each of the undetermined addresses.