Contact histogram for programmable controller

Details Contact histogram for programmable controller Contact histogram for programmable controller

G - Physics

06

F

354/230.3

G06F 11/00 (2006.01) G05B 19/05 (2006.01)

Patent

CA 1070844

CONTACT HISTOGRAM FOR PROGRAMMABLE CONTROLLER Abstract of the Disclosure A controller programmer connects to a programmable controller and serves as a means for loading and editing the control program. When the contact histogram mode of operation is employed the logic state of a selected I/O device connected to the controller is monitored, and each time its status changes, its present status is recorded along with the time interval between status changes. A first embodiment is described in which the invention is employed in a hardwired controller program loader and a second embodiment is described in which the controller pro- gram loader employs a programmed microprocessor. In the first embodiment the status changes are recorded on paper tape and in the second embodiment they are recorded on a cathode ray tube screen.

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