Multi-host communication system with multi-layer expansion architecture and communication method

Abstract

The invention discloses a multi-host communication system with a multi-layer expansion architecture. The multi-host communication system comprises multiple communication layers, wherein each communication layer comprises one or more communication buses; each communication bus comprises at least one node function module; at least one node function module in the same communication bus is connected with the node function module of one communication bus in the adjacent communication layer; each node function module in the same communication bus sends data to the communication bus and receives thedata transmitted on the communication bus in a self-adaptive mode in a rotating mode; the data sent to the communication bus by each node function module connected with the node function module of theadjacent communication layer in the same communication bus comprises the received data sent by the node function module of the corresponding adjacent communication layer; and the data sent to the node function module of the corresponding adjacent communication layer comprises the received data transmitted on the communication bus. According to the system, infinite expansion of communication nodesand stations is realized, and the cable reuse rate is improved.

Description

technical field [0001] The present application relates to the technical field of data communication, in particular to a multi-host communication system and a communication method with a multi-layer extended architecture. 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 purpose. [0003] When the number of field devices is relatively large, the...

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Problems solved by technology

However, in these two ways, the amount of cables will increase significantly with the increase of field devices, because the cables are point-to-point connections for each level of master-slave and slave-slave control equipment, and As the level increases, the amount of cables in the same transmission direction will be large, and there will be a large bundle of cables bundled from a slave station to the master station or from a slave station to the slave station control equipment, the collected cables There will be more and thicker I / Os because there are other slave stations or devices to be connected, so a large number of communication cables will be generated, which is not conducive to the construction of communication architecture, and it will increase the cost, and it is difficult to cover the higher order of magnitude equipment and it is difficult to deal with scenarios where equipment is widely distributed

[0004] In addition, the current distributed control system, master-slave control system or other bus system, the site expansion capability is limited by hardware load capacity, communication rate and other factors, resulting in low actual expansion capability and limited equipment expansion capability. It also makes it difficult for existing systems to be applied to scenarios with high-order devices and large-scale device distribution

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