Prorgammable Logic Controller(PLC)is a kind of control device which is applied in everywhere and atached importance to ineducation depatrment. But in Many schools,experimental facilities for PLC are dissatisfied to instruction Requirement because of the various kinds of reasons.With the development of Computer multimedia technology, "Simulation Experiment StyleCAI" plays more .And more impotrantly role in the course of experiment instruction."PLC Simulation Experiment System”，which has been ifnished,can fillagapto developed PLC Experimental facilities and provide a good teaching-tool to teachers.
To expand the methods of developing PLC control system with computer simulatiotechnology, a software of computer simulation platform based on LabVIEW is developed for PLC control system. By the means of the graphical programming language and hierarchicastructure of LabVIEW, the software is designed after deep analyzing the working principle anprocess of PLC control system.
On this simulation platform, the users can use the block diagramin ladder form to build the simulation model for PLC control system and adjust the systemconveniently and rapidly. Experiment results show that, with the help of the simulation platformthe PLC control system can be developed efficiently, safely and economically. The simulation platform is some value in engineering application
Key words: PLC control system, computer simulation, LabVIEW, failure test
