DESIGN OF INSTRUCTION LIST (IL) PROCESSOR FOR PROCESS CONTROL

Abstract

Programmable Logic Controller (PLC) is a device that allows an Electro-Mechanical engineer to automate his mechanical process in an efficient manner. Safety critical high speed application requires quick response. In order to improve the speed of executing PLC instructions, the IL processor is researched. Hierarchical approach has been used so that basic units can be modeled using behavioral programming. These basic units are combined using structural programming. Hardwired control approach is used to design the control unit. The proposed IL (Instruction List) processor work upon our developed IL instructions which are compatible with the programming language IL according to the norm IEC 61131-3. This can accelerate the instructions execution, ultimately improve real-time performance comparing to the traditional sequential execution of PLC program by giving quick response at such safety critical high speed application. The design is to be implemented   on FPGA for verification purpose. To validate the advance of the proposed design, two ladder programs are compiled to the instruction set of proposed IL processor as well as in IL programming language.