Distributed multi-host communication system, functional module and communication method thereof

Abstract

This application discloses a distributed multi -host communication system, including multiple function modules connected through the communication bus. Each functional module has a unique identification code. Each functional module is repeatedly planned simultaneously, and the time time period reaches the wheel.Determine whether the unique identification code of this function module matches the current identifier code of the communication system during the trigger cycle. When determining the identification code matching, send data to other functional modules in the communication system through the communication bus.Data from the only function module of the current identification code with the current identifier code of the communication system with the communication bus.The system saves cable dosage and wiring workload, reducing the requirements for data throughput, and any failure of a host will not affect the operation of other normal hosts.

Description

technical field [0001] The present application relates to the technical field of data communication, in particular to a distributed multi-host communication system and its communication method, as well as a functional module of the distributed communication system and its communication method. Background technique [0002] At present, in the data collection and function execution of the control equipment, the PLC master-slave station is generally adopted. The slave station provides the interface with the field device and the communication with the master station, and is responsible for sending the data collected from the field device to the master station. Station, the master station provides functions such as calculation processing and communication processing, and is responsible for processing the collected data, knowing the on-site situation according to the processing results, and controlling the on-site equipment to perform corresponding actions to achieve the desired pu...

AI Technical Summary

Problems solved by technology

[0004] 1. Under this communication architecture, when there are many field devices, since each device needs to be connected to the master station to be controlled by the master station, and the field devices may be far away from the I / O module of the PLC in the master station’s central control cabinet, Therefore, a large number of communication cables will be generated, which is not conducive to the construction of communication architecture and increases the cost

[0005] 2. Since the sites under this communication architecture are divided into master stations and slave stations, and there is only one master station, when the communication module or even the CPU of the master station fails, the entire architecture will be paralyzed and the stability is poor. too sensitive to failure

[0006] 3. When adding field devices, since all control programs are in the same program file of the master station, when there are many devices connected to the master station, the content of the control program will be more, and the addition of field devices may involve modification of the program. For the case where all programs are concentrated in one file, the workload is large, time-consuming and labor-intensive

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