A real-time serial communication system supporting multiplexing of modbus and ppi protocols

Abstract

The present invention relates to the field of industrial control technology, a real-time serial communication system supporting Modbus and PPI protocol multiplexing, including a management computer, a control master station, a control slave station and a serial network communication line, and the control master station includes a resolution The configuration file module and its sequentially connected traversal resource information module and assembled message module also include a parsed message module and a serial communication interface, the parsed configuration file module, assembled message module, parsed message module and serial network The communication lines are respectively connected with the serial communication interface, and the serial network communication lines are respectively connected with the equipment 0, 1, 2, 3...N in the control slave station through the serial port, and the present invention realizes the Modbus slave equipment and the Siemens PPI slave equipment seamless integration. In addition, the present invention establishes a complete state machine of the Modbus and PPI protocol multiplexing serial communication system, multiplexes the real-time scheduling state machine processing mechanism with the Modbus and PPI protocol, ensures that the work of the master and slave stations is coordinated, and makes the entire network system self-adaptive. sex.

Description

technical field [0001] The invention relates to a real-time serial communication system supporting multiplexing of Modbus and PPI protocols, belonging to the technical field of industrial control. Background technique [0002] In the field of industrial control technology, there are many types of products, and each manufacturer supports its own protocol, which makes it difficult to interconnect various devices. The RS485 serial bus is widely used, and there are many types of serial communication protocols, each of which has a different format or mechanism. In order to meet the interconnection requirements of various devices in different control systems, it is necessary to build multiple protocols in the device, and realize the data interaction between the control master station and different protocol control slave station devices through the assembly and analysis of messages. At present, different gateways are used to realize the interconnection of various devices. The syst...

AI Technical Summary

Problems solved by technology

At present, different gateways are used to realize the interconnection of various devices. The system composition is complex, there are many types of devices, and network system management and system integration are difficult.

Images