The Study of Soft PLC Running System

摘要

PC-based automatic control system is low cost, open good, easy to use, etc., so it becomes a new direction in the automation technology. The formulation of international standards EIC61131-3 not only normalizes the field of industrial control programming language, but also provides the conditions for the development of PLC technology. This paper introduces the theory of soft PLC, discusses the PLC software models and implementations based on the EIC61131-3 standard, detailed describes the principle and implementation of soft PLC operating system programs, designs soft PLC running system software based on industrial PC, constructs soft logic control system based on industrial PC. Finally, the real-time performance and reliability of the soft PLC were verified. The results show that the system is reliable and control effect is good.