Inventors:
Warren E. Dion - Bristol CT
Assignee:
The Arthur G. Russell Company, Incorporated - Bristol CT
International Classification:
G05B 1128
Abstract:
A programmer or switching apparatus produces an ON and OFF valued control signal for turning an associated controlled component ON and OFF at preselected points in the variation range of a reference variable. The apparatus includes a reference transducer for converting the reference variable into a reference signal representing the variable. A pair of set-point devices provide a pair of set-point signals which are compared with the reference signal to define operating points at which the control signal switches between its ON and OFF values. The apparatus has the versatility of allowing, by merely setting the set-point devices and without making any circuit changes, the first transition of the control signal to be either from ON to OFF or from OFF to ON as the reference variable increases from its minimum to its maximum value. A number of basic units or parts of basic units may be combined to provide a number of control channels controlling the operation of a number of controlled components in response to the same reference variable. The reference variable may be the angular displacement of a rotatable shaft which may rotate continuously in one direction through repeated revolutions or which may oscillate back and forth between given end points.