JPS58164352A - Loop type data communication system - Google Patents

Abstract

PURPOSE:To eliminate the need for a control station and to eliminate the need for a response signal from a reception side, by carrying about the right of communication in every station, and regenerating a frame at each station. CONSTITUTION:A figure shows a frame circulating in a loop and the frame consists of a flag F, control statements CNT (CH1-CHN), and data statements INF (CH1-CHN corresponding to the CHs of the control statements). A station having the right of communication sets addresses to some of the channels of the control statements and insert data to be transmitted into the channels of the corresponding data statements. If there is no data to be transmitted when this frame is received after one round, the right of communication is passed to a bext station. General stations read the control statements and receive only necessary data.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement to the loop type data communication system.

A loop-type data communication system is one in which a plurality of communication stages are connected in a ring with communication lines to form a closed loop, and communication signals are circulated throughout the loop. In such a loop-type data communication system [1], each communication stage only needs to transmit a signal to the next communication stage 1, which simplifies the control of the transmitted data. There are some advantages.

In such a loop-carved data communication system, some kind of communication control device is required to control the communication of the entire system. Conventional loop-type data communication systems are now equipped with a dedicated central control station, but in this way the system control center is concentrated in one place, which reduces reliability. This is not desirable when configuring or implementing a high-end system.

In addition, regarding the conventional loop data communication system,
Between two communication stages in a communication relationship, one communication is completed by sending a command from the leading side of the communication and returning a response from the passive side, so the communication speed is lower than that of the passive side. It is affected by how quickly the side returns a response. However, since the response cannot be made infinitely fast, there is a limit to how fast communication can be achieved.

An object of the present invention is to provide a loop data communication system that does not have a control stage and does not require the passive side of communication to return a response.

The present invention provides a loop-type data communication system in which a plurality of communication stages are connected in a ring by communication lines, and communication signals are circulated through the ring-shaped communication lines while being reproduced by each communication stage. Define statements and data statements that contain multiple split channel field pairs, and multiple communication stages.
The initiative of communication is rotated from one to another, and when the authority has the initiative, it inserts its own stageron honor code into the desired channel field of the control statement of the communication frame, and also communicates in the channel field of the data statement. insert the data,
The above object has been achieved by a loop type data communication system which is characterized in that it is equipped with a control circuit that relinquishes control of the communication by trapping the communication frame around the loop.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a conceptual configuration diagram of an embodiment of the present invention. In FIG. 1, 11 to 1fi are communication stages,
The configurations of the communication stages 11-111, which are loop-connected as shown in Communication II2, are all equal, and each stage has a special configuration as a control stage. do not have.

The input/output section of each stage is, for example, as shown in FIG. 2, an input signal receiver 8 and an output compensation transmitter! , a buffer IIUF for transmitting and receiving signals, and a controller C thereof. The signal on communication line 2 is sent to buffer IIT through reception @a.
JFK is taken in, and the contents of buffer IIUF are sent by the transmitter! Buffer m1UP sent to communication line 2 through
The operation and content of is controlled by controller C.

The frame structure of the signal to be communicated is, for example, as shown in FIG. S, and consists of a control statement CNT and a data statement INF with flag r at the beginning. The controller C performs control based on the flag F of such a signal and the control statement CNT. Flag F and control statement CNT are rewritten by the communication stage controller that has the initiative in communication. The initiative in communication is rotated among a plurality of communication stages in turn. Information regarding sovereignty is also flag F or control statement CNT.
include.

FIG. 4 shows a more detailed structure of the communication frame. Fourth
As shown in the figure, the control statement CPPr and the data statement! The dimensions are divided into multiple channel fields. The number of channels is control statement CNT and data statement! The channels are arranged in the same order so that channels of the same order form pairs. Each communication stage 1i (1-1 to n
) has data channels corresponding to these channels, and data is exchanged as described below between the corresponding channels.

A plurality of such communication frames are always circulating with serial number ζ on Communication@2. Communication stage Dan 11~
One of the stage codes in I11 that takes the lead in communication inserts its own stage number into several desired channel Φ fields in the control statement CNT, and
Data statement! Insert communication data into the paired channel field of V. - Each other communication stage code extracts the necessary information from the communication frame according to the flag of the circulating communication frame and the information contained in the control statement CNT. Import data. Therefore, once the communication frame completes the loop, the data sent by the stage with the initiative in communication is received by the other party's stage. The stage that sent the data recognizes that one overconfidence has been completed when the same overconfidence frame goes around the loop and returns, and does not send a response that might violate the receiving stage. - An overconfident stage master who has completed one communication either retains exclusive authority to conduct the next communication, or relinquishes the initiative and returns to the state of receiving data transmitted from other communication stage masters. enter. A similar operation is then performed at the communication stage, which takes the initiative in communication.

As described above, in the communication system of FIG. 1, each of the circulating communication frame communication stages 1t sends and receives this data as appropriate, so a special control stage controller is used to control the communication of the entire system. is not necessary. Furthermore, since no response is required from the receiving side, it is suitable for speeding up communication.

Although the present invention has been described above with reference to preferred embodiments, the present invention may be implemented in various ways within the scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a conceptual configuration diagram of an embodiment of the present invention, and FIG. 2 is a
FIG. S is a block diagram of a part of the communication stage, and FIG. S is an example of a communication frame. FIG. 4 is a more detailed block diagram of the communication frame. 11-1n...Communication stage seal 2...Communication line,
? ...Flag, CM? ...control statement, XNF...data statement. Procedural amendment - (method) Mr. Commissioner of the Patent Office 1, Indication of case, Japanese Patent Application No. 57-46786 2,
Title of the invention Loop-type data communication system 3, relationship to the amended person's case Applicant's address 32, Nakamachi 2-9, Musashino-shi, Tokyo Name (67G) Yokogawa Electric Corporation-Sakusho 4, Agent

Claims (1)

[Claims] In a loop-type data communication system in which multiple communication stage programs are circulated through a communication line while being played back by a circular stage code, multiple communication stages are used in control statements and data statements as communication frames. Defining a pair of split channel fields, multiple overconfidence stages take turns in taking control of the communication, and when they have the initiative, they define the desired channel field in the control statement of the overconfidence frame. It inserts its own stay lane number into the field, and also inserts communication data into the channel field that forms a pair of data statements, and when this communication frame returns through the loop, it relinquishes control of the transmission line. Do you want to be equipped? #Loop type data communication system with mold.