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Procedia
Engineering
ProcediaProcedia Engineering Engineering 00 (2011) 15 (2011) 000–000 1234 – 1238

Advanced in Control Engineeringand Information Science
The Study of Soft PLC Running System
Quan Liang∗a, Li Lia
aSchool of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
Abstract
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 pro