Patent ID: 9513617
Filing Date: 2016-12-06
CPC Classification: G05B

Claim Text:
1. An I/O module for industrial control comprising: an input for receiving a trigger signal from a first sensor at a first stationary location, the trigger signal indicating passage of an object located stationary in a moving frame, the moving frame being defined by detectable registration marks spaced apart on a moving conveyor; a network interface adapted to communicate with an industrial control network to receive periodic motion data from an encoder indicating sensed positions of the moving frame by sensing positions of the moving conveyor with respect to a reference line, the reference line being defined by a second sensor at a second stationary location adapted to detect passage of a detectable registration mark on the moving conveyor; and an electronic computer communicating with a memory to execute a stored program contained in a fixed medium of the memory to: (1) interpolate the periodic motion data to determine a current position value of the moving conveyor between arrivals of the periodic motion data; (2) extrapolate the current position value to determine an extrapolated current position value; (3) capture the extrapolated current position value at a time of the trigger signal indicating passage of the object to determine a captured extrapolated current position value; and (4) correct the captured extrapolated current position value by a spatial offset value stored in the memory to determine a corrected captured extrapolated current position value, the spatial offset value being defined by a spatial separation between the reference line and the first sensor at the first stationary location providing the trigger signal.