Abstract: Graphical editing methods are employed to construct programs in high-level graphical languages prior to compilation and operation in controllers for industrial or commercial equipment. The editing methods include process, hardware and program editing tasks for defining both process and hardware I/O points and connecting them to variables in a controller program. Each editing task has a tree graph window, a graph editing window, and a palette with rotating panels of graphical editing tools. The hardware editing taks uses two-layered icons to graphically simulate the hardware environment. A plurality of graph types are based on generalized node-vert-arc graphical elements which are special classes programmed in the Smalltalk programming language. Languages for the controller program include function block, sequential function chart and ladder diagram.

Abstract: A synchro-to-digital converter circuit is disclosed which includes memories that store digitized representations of the waveforms produced by the resolver. By matching these digitized waveforms to the specific resolver with which the circuit is to be employed, errors produced by the resolver are compensated.Two embodiments of the synchro-to-converter circuit are disclosed as well as a circuit for creating and storing the matched waveforms.