Noise Detection for Digital Input Lines to Provide Increased Safety in Robot and Tool Operation
Original Publication Date: 1988-Nov-01
Included in the Prior Art Database: 2005-Feb-15
This article describes a technique for detecting noise on digital input lines required for robot and tool controllers. The levels and frequencies of noise a controller will encounter in a given application are not always known. This results in making an electrical solution to a noise problem incomplete, in that the noise environment of the controller may change, making the electrical solutions ineffective. By using the software, the controller can be programmed to define the frequency and level of noise to be tolerated and which to flag as an error. This allows a controller to continue operation in a new environment unless the level of noise would otherwise make it unsafe. One detail to be addressed with the technique disclosed herein is that of the digital signal transitioning while the digital input line is being sampled.