JPS63227149A - Communication control method in loop communication 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 Industrial Application] The present invention relates to a communication control method for a talk ring communication system having a loop shape.

[Conventional technology]

2. Description of the Related Art Conventionally, a talk ring type communication system is known as a communication system in which communication is performed by forming a loop-shaped communication path between computer systems.

The token issuance cycle is generally fixed at a time longer than the maximum token delay time in a large-scale system. Note that related communication control systems of this type include, for example, Japanese Patent Application Laid-Open No. 160747/1983.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology is a communication system in which a loop-shaped communication path is formed between computer systems to perform communication, and the Nido-kun issuance cycle can be set to a cycle according to the scale of the communication system or the processing capacity of the computer system. There was a problem in that it was not possible to carry out efficient communication suitable for various communication systems.

An object of the present invention is to provide a communication control method for a communication system that eliminates the drawbacks of the prior art by issuing tokens with a cycle that corresponds to the scale of various communication systems or the processing capacity of each computer system.

[Means for solving problems]

The above purpose is to control the transmission and reception of communication data between a plurality of computers in synchronization with tokens based on a transmission and reception control device processing program provided corresponding to each of the plurality of computers and stored in a program storage unit. In a loop communication system connected in a loop by a communication control device.

Only one of the communication control devices is set as the token issuance management station, and the token issuance management station is provided with a token issuance cycle setting unit that can arbitrarily set the token issuance cycle, and the token issuance cycle is set based on the setting information. This is achieved by storing a token issue cycle processing program that controls the token issue cycle in the program storage section, and controlling a token issue cycle timer using the stored program.

[Effect]

According to the present invention, one of the plurality of communication controls (i
By setting only the control device as the token issuing management station, the management of tokens of the communication system is concentrated in this token issuing management station, and other communication control devices are unable to control tokens. In this way, by providing a token issuance cycle setting section that can arbitrarily set the token issuance cycle in the token issuance management station that centrally manages talk in the communication system, it is possible to control the scale of the communication system to be applied and the data processing capacity of each station. You can arbitrarily set the token issuance cycle to suit your needs. The token issuance cycle can be set in various ways, such as manually or by command from a computer. When the token issuance cycle is set in accordance with the communication system, a processing program for token issuance control stored in advance in the program storage unit is started based on the setting information.

A token issuance cycle timer is controlled, and the entire communication system executes communication operations in synchronization with the token cycle determined by this timer.

In this way, according to the present invention, there is a degree of freedom in issuing tokens with a cycle that corresponds to the scale of various communication systems and the processing capacity of the computer system, and execution of communication operations most suitable for the communication system concerned is achieved. This makes it possible to

〔Example〕

Next, embodiments according to the present invention will be described based on the drawings.

First, FIG. 2 shows a coupled state of a loop communication system to which the present invention is applied. Each computer system is connected to main computers 11 to 1 and communication control devices 2L to 2L correspondingly connected via computer interface buses 31 to 3o, respectively.
The computer systems are connected to each other in a loop through communication lines 4. The communication control devices 21 to 2o have functions such as data transfer control with the main computers 11 to 1n, frame monitoring on the communication circuit 4, token issuance management, and text transmission/reception control.

Next, details of the communication control method according to the present invention will be explained. FIG. 1 shows a detailed block diagram of a communication control device of a computer system that performs torque generation management. However, the communication control device of the computer system that performs token issuance management in this communication method shall be one in the communication system, and no more than two shall be allowed; here, 21 communication control devices perform token issuance management. Explain as a thing. therefore.

In the following description, 21 will be referred to as a "management station", and the other communication control devices (2z to 2.) will be simply referred to as one station.

In FIG. 1, the computer interface bus 31 is
The communication circuit 4 is connected to a computer-side control section 8 , and the communication circuit 4 is connected to a communication line-side control section 9 . These computer side control section 8 and communication line side control section 9 are connected to an internal interface bus 12.
It is connected to the arithmetic processing section 5 via. The arithmetic processing unit 5 includes
Other program storage unit 6. Data storage unit 7. A timer section 10 and a token issuance cycle setting section 11 are also connected via an internal interface bus 12. The above is the configuration of the management station 21, and the conventional management station (communication control device) does not include the token issuance cycle setting unit 11 in the configuration shown in FIG.

In the above circuit configuration, the management station 21 receives an outgoing command and transmission data from the computer 11 via the computer interface bus 31 using the computer side control unit 8, and sends the instruction to the arithmetic processing unit via the internal interface bus 12. Report to 5. The arithmetic processing unit 5 interprets the transmission command using a program stored in a program storage unit 6 in which a program for performing predetermined transmission control processing is stored in advance, and a data storage unit 7 that temporarily stores transmitted and received data.

The transmission data is converted into a format at a predetermined timing and format by the communication line side control section 9, and sent to the communication line 4.

On the other hand, data received from the communication line 4 is received by the communication line side control section 9, converted into a predetermined timing and format, and reported to the arithmetic processing section 5 via the internal interface bus 12.

The arithmetic processing unit 5 converts the format of the received data using the program and data storage unit 7 stored in the program storage unit 6 in which a program for performing predetermined reception control processing is stored in advance, and converts the format of the received data to the computer interface bus 31 using the computer control unit 8. A reception report and reception data are sent to the main computer 11 via the main computer 11. In this operation, one communication control device 21 in the loop performs token issuance management and text transmission/reception operations on the communication line side, as described above.
Only the management station 21 manages to issue tokens periodically, and sends the token of this management station 21 to the next station to permit use of the communication line 4.

If the station that received the token does not have a transmission request from its own computer, it will pass the token as is and the right to use the communication line to the next station, but if there is a transmission request from its own computer, it will not send the text. The receiver sends a token following the text and passes the right to use the communication line to the next station.

In this operation, the token passes through each station one after another, and if there is no transmission request from its own computer to any station, the token issued by the token issuing management station 21 returns to the corresponding management station 21 as is, and each station receives the transmission request from its computer. If there is a request, the texts are concatenated one after another, and the token issued by the station that last sent the text is returned to the management station 21. Here, each station receives text addressed only to its own station, and sends text addressed to another station as is to the next station. Regarding tokens, only tokens issued by the station are read and tokens issued by other stations are sent as they are to the next station.

Under such operating conditions, if transmission requests from computers occur one after another at each station, tokens will not be quickly cut off, but when the station that issued the token receives the token issued by itself, it disappears. Further, if there is no transmission request from the computer to each station, the token disappears at the management station 21. The reason for extinguishing the token is to prevent the token reception processing operation of the communication control device from being affected by the transmission command processing operation from the computer, since the token continuously passes through the communication control device, which is a station. . The token issuance cycle time Ts is set to be less than or equal to the maximum token delay time Ts^X in which the texts of all stations are successively connected to the token issued by the management station 21, and the token issued by the station that last sent the text returns to the management station 21. Multiple tokens occur simultaneously within the loop, making communication control impossible, so T s > T
It is necessary to use HAX. This maximum token delay time TM^X differs depending on the scale of various communication systems or the processing capacity of each computer system.

Based on the above conditions, the token issuance management station 21 in this circuit configuration can set the token issuance cycle according to the scale of various communication systems or the processing stress of each computer system using the processing program that performs token issuance management. The timer section 10, which can be programmed at any time, is controlled by the time signal set in the setting section 11, programmed to a token issuance cycle time Ts suitable for the communication system, and the control station 21 issues tokens when receiving and other stations. Issues a talk, and when received, issues this talk and starts an issue cycle timer Ts.

When the token issued by the management station 2 is received, it disappears at the management station 21, so the token is not received before the token issuance cycle timer Ts times up, but when the token issued by another station is received, it is sent as is to the next station. Therefore, if text transmission requests are occurring one after another at the next station or below, the token issued by the other station may be received before the token issuance cycle timer Ts times out. At this time, the token issuance cycle timer Ts is restarted, and only when the token disappears at another station, the token issuance cycle timer Ts time-amps and issues the next token. In FIG. 3, when the token issue cycle timer Ts times up, the station 22 receives the token F1 issued by the token management station 21 from the management station 2.
1 sends text D2 → 1, all stations send texts one after another, management station 21 receives text D2 → 1, and finally token F0 issued by station 2n, which received the text, reads the text. Taking as an example a case in which a token issued by another station is received, a time schedule diagram of the maximum token delay time T pasted X and activation of the token issuance cycle timer Ts when receiving a token issued by another station is shown.

In FIG. 4, the token Fl issued by the token management station 21 is received as is by the management station 21 due to the time-up of the token issuance cycle timer Ts, and the token Fl is read and discarded. Also, there is a text transmission request to the management station 2, and the timer Ts At the time up, station 2n arm text Di →. and station 2n
As an example, assume that the token F1 issued by the management station 21 is read and discarded by the local station after receiving the text D1 → 0 addressed to the local station.
and a time schedule diagram for starting the token issuance cycle timer Ts.

According to this embodiment of the circuit configuration and functions described above, the token issuance cycle setting section 11 and a processing program that controls part of the timer based on this setting information and manages token issuance can be used to control the scale of various communication systems or the computer system. It is possible to issue tokens with cycles according to processing capacity,
Therefore, it is possible to realize a communication control method for a loop communication system that improves the communication efficiency of various communication systems and eliminates the drawbacks of conventional communication control methods that do not take such consideration.

〔Effect of the invention〕

As described above, according to the present invention, with a simple token issuance management program and circuit configuration, a communication path is formed in a loop between computer systems, and the scale of the communication system and the processing of each computer system are realized. Since tokens can be issued at intervals according to the ability, the communication efficiency of various communication systems can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a communication control device showing an embodiment according to the present invention, FIG. 2 is a block diagram of a loop communication system,
FIG. 3 is a time chart when receiving a token issued by another station, and FIG. 4 is a time chart when receiving a token issued by the own station. 11-1□... Main computer, 21-2n... Communication control device, 31-3n... Computer interface bus, 4... Communication circuit, 5... Arithmetic processing unit, 6...
Program storage unit, 7... Data storage unit, 8... Fraud machine side control unit. 9...Communication line side control unit, 10...Timer part, 1
1... Token issue cycle setting section, 12... Internal interface bus.

Claims (1)

[Claims] 1. Transmission of communication data between a plurality of computers in synchronization with tokens based on a transmission/reception control device processing program provided corresponding to each of the plurality of computers and stored in a program storage unit. In a loop communication system in which communication control devices that control transmission and reception are connected in a loop, only one of the communication control devices is set as the token issuance management station, and the token is issued to this token issuance management station. A token issuance cycle setting section capable of arbitrarily setting the issuance cycle is provided, a token issuance cycle processing program for controlling the token issuance cycle based on the setting information is stored in the program storage section, and the token issuance cycle is set by the stored program. A communication control method in a loop communication system characterized by controlling a timer. 2. A communication control method for a loop communication system according to claim 1, characterized in that the token issuance cycle setting section can be manually set. 3. In the communication control system according to claim 1, the setting of the token issuance cycle setting section is performed by a token issuance cycle information setting command from a computer and an arithmetic processing section program that interprets this command and performs the setting. A communication control method for a loop communication system characterized by: 4. In the communication control method as set forth in claim 1, the setting of the token issuance cycle setting unit is delayed to a maximum by a diagnostic token that causes all communication control devices to sequentially send texts at the time of startup of the communication system. 1. A communication control method for a loop-shaped communication system, characterized in that the communication control method is performed by an arithmetic processing unit program that diagnoses the time, and an arithmetic processing program that sets a token issuance cycle suitable for the communication system based on the diagnosis result.