Abstract: A method for implementing object oriented programming in Programmable Logic Controller graphical programming languages. The method for creating, executing and controlling objects and object subroutines, including allocation of private data memory, passing of parameters and parameter references and passing of program control. The extension of object programming to embedded objects resident on a separate processor coupled with the passing of data and control between the embedded object and its host processor. The further implementation of embedded object automatic identification capability to enable the implementation of “plug and play” functionality within PLC systems.

Abstract: A method for the extension of the reliable distance and improvement in reliable speed for Programmable Logic Controller high speed serial bus communications between its logic unit and input/output modules. The insertion of differential line drivers and receivers into signal lines, originally developed for IC to IC on board communications, to enable wired bus communications over tens or hundreds of meters.

Abstract: A system for the development, compilation, execution, monitoring and debug of automated test and simulation systems in a flow chart programming language. A development and debug system, implemented as software on a computer, which provides an application developer the capability to enter fully defined application programs through the use of graphical flow charts. An executions system, implemented as a program on a device incorporating a central processing unit, memory, communications and necessary interfaces, which executes graphical flow charts compiled by the development and debug system. The development and debug system communicates with the execution system to download programs, control operation, monitor operation and provide a debugging environment.