Abstract: An attachment device is split collar that surrounds a conventional keyway or setscrews. The split collar arrangement is equipped with either two or four bolts (one or two per side) depending on the overall size of the invention. In the case of use on a keyway, one half of the invention has a groove to hold the keyway in position. As the bolts of the invention are tightened down, the keyway becomes locked in place.

Abstract: A process control system for controlling a set of outputs according to a multiplicity of inputs. The process control system analyzes the condition of the inputs as though they were arranged in a hypothetical ladder diagram which is a representation of the circuitry that would be required to control the loads if simple switches were interconnected, by wires, in the conventional way to control the loads. The hypothetical ladder diagram includes a plurality of hypothetical horizontal rows of circuit elements in which the circuit elements are also located in hypothetical vertical columns. All of the hypothetical vertical columns, except the last, are "input" vertical columns since they represent input circuit elements. The last vertical column contains the loads (or outputs) and is an "output" vertical column.