Research And Development On The Soft-PLC

The Soft-PLC technology is a brand new control system that based on the PC platform. It has open architecture, more capacity in the network communication and data processing. Besides, this system can meet the control requirement of modern automation. So the research of this system becomes the focus of industrial automation field.This thesis expounds the architecture of the Soft-PLC system and gives the approach that how to design and realize the Soft-PLC system by analyzing and discussing the related technique and concepts. It also gives the architecture and work elements of the PC and lower system and puts detail to realize them.Combined with the IEC61131-3 standard, we set the Soft-PLC system up by using VC++6.0. This system gives the related function such as programming of the ladder diagram/IL and the transform between them, procedures compiler and offline simulation.Mainly work that this paper has done is as follows:(1). Pointes out the advantage of the Soft-PLC system compared with the traditional PLC and the necessity of developing this system.(2). Pointes out the necessity of using the IEC61131-3 standard during developing the Soft-PLC system. For the sake of the Soft-PLC possess- ing versatility and probability, this paper has carried on the plan of the concrete application about using IEC61131-3 during developing the Soft-PLC system.(3). Establishes the frame of Soft-PLC platform and the overall construction of the software module of the Soft-PLC system according to the IEC61131-3 standard.(4). Designes the project manager module, compiler module and simulation module; Realizes the ladder diagram editor, IL editor, transform mechanism between ladder diagram and IL and compiler on the PC system and so on.(5). Carries out the research and analysis about the lower system and proposed the available realization on both hardware and software for it.Finally, this paper carries on the thorough analysis about essential technical question during research and proposed the concrete solution.