Abstract: A load tensiometer transducer, a boom angle transducer and a boom length transducer are operatively connected to a telescopic variable boom length and crane product. Boom load, angle and length analog signal control logic, responsive to the signals of each transducer, receives, amplifies, and converts the signals into corresponding digital signals that are continuously processed with data read from one of a plurality of selected memory circuits in which information based on the configuration of the crane in use is stored. Digital output signals are produced by the control logic for use in operating a digital radius readout, allowable load readout, and actual load readout, respectively.

Abstract: A logic programmer panel has been provided for programming a digital controller with instructions directly from a process representation of a process control system for directing the operation of the same. The digital controller has inputs and outputs for respectively sensing and controlling various stages of the process. The programming panel includes selectable means and defining indicia associated therewith for programming the computer with instructions in a human language format from the flow chart when the individual portions of the means are selected. The selectable switch means, each having a digital code associated therewith for converting the human language format of the associated instructions into a code instructions each code when read by the controller being effective to store the instructions within a memory portion of the controller so as to affect the instruction defined by the selection of the word indicia of the selectable means.