User programmable PLC (programmable logic controller) serial communication extension module

Abstract

The invention discloses a user programmable PLC (programmable logic controller) serial communication extension module, which uses a naked machine framework instead of an embedded operating system, and provides a serial read-write drive interface required by user programming and development and library functions such as a system data area read-write interface function, a soft timer operating function and the like; a user accomplishes works such as development, debugging and downloading of an application program of a communication protocol and the like and then performs module configuration, configuration file downloading, serial communication debugging and the like through an Ethernet interface and at the same time; and the Ethernet can provide communication functions of Modbus TCP communication or other communication protocols. As the embedded operating system is not used in a software layer, associated expenses of the operating system and works such as development and maintenance and the like of the operating system are reduced; and the user programmable PLC serial communication extension module has lower requirements on performances of a core CPU (central processing unit) and a memory system, so that development difficulty and cost of software and hardware are reduced greatly.

Description

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AI Technical Summary

Benefits of technology

The technical effect of this patented technology reduces cost for developing and debugging serial ports by reducing their size while improving its performance compared with older versions.

Problems solved by technology

This patented describes how it can work together by connecting several types of equipment through one interface called a serial bus (USB). However, this method requires that all these machines operate within certain specifications such as timing synchronization, data transfer rates between them, and memory access capabilities. To achieve compatibility across various interfaces, there must be some way to allow any device connected over those interfaces to perform operations quickly without interfering with other components being controlled by another machine. Additionally, current methods require expensive firmware modules like LAN cards and servers to handle complex network communicating applications.

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