Some Key-technologic Research And Application Of Control Software Based On IEC 61131-3 Standard

The IEC 61131-3 Standard, which was publicized by IEC, is a criterion about program language, and formatted the program languages and basic elements of programmable controllers. It is important for the technologic development of programmable controller, even in the whole industrial control software. The advantage of IEC 61131-3 is that it uses concepts and mechanism of modern software engineering in the conventional PLC program languages.The origin of this project is the National Innovation Fund For TechnologyBased Firms project——"the soft-PLC control software based on IEC 61131-3standard", and the Significant Technology Research Fund of GuangxiUniversity——"the advanced control software based on IEC 61131-3 standard".This paper mainly researched some key-technologies of control software based on IEC 61131-3 standard: 1) opening technology, 2) realization technology of firm function block, 3) driving of hardware, 4) OPC interface. The program system based on IEC 61131-3 standard, which adapts to the field of industrial control, offers the OPC interface and advanced control arithmetic function block.