Abstract: A control for use with pressure-sensitive devices, such as in a machine-guarding application. A plurality of pressure-sensitive devices, such as pressure-sensitive safety mats, are operatively connected to produce a disable signal and a status signal. An activation module produces a switching output responsive to the disable signal and the status signal to disable a machine. In one embodiment the status signal is produced by a comparator in response to a quantity selector and a quantity indication signal produced by the pressure-sensitive devices. In the preferred embodiment, the control system of the present invention is able to detect proper safety mat configuration, whether a threshold pressure is being applied to a pressure-sensing region in the plurality of safety mats, and whether the quantity of operatively coupled safety mats conforms to the quantity specified to be deployed.
Type:
Grant
Filed:
September 17, 1999
Date of Patent:
July 16, 2002
Assignee:
Honeywell Data Instruments Inc.
Inventors:
Andrew Dexter Baker, Luis Filipe Travassos