Horner APG XLt OCS - Manual (Page 41)

MAN0878-04-EN CH. 10
August 12, 2009 Page 41 of 100 ECN # 979
Width Low 1 µs Counts - In this sub-mode the accumulator value will contain the number of 1 µs
counts the pulse is low.
Period Rising Edges 1 µs Counts – In this sub-mode the period of the input signal is reported in
one (1) µs units. The period measurement will start on the rising edge of the input.
Period Falling Edges 1 µs Counts – In this sub-mode the period of the input signal is reported in
one (1) µs units. The period measurement will start on the falling edge of the input.
10.2.4 Quadrature
Two HSC inputs are consumed for each of the two possible Quadrature counters. For example, selecting
quadrature mode for HSC 1 will use HSC inputs 1 and 2, which correspond to A and B quadrature
signals. Therefore, HSC 1 and 3 may be configured for quadrature input. Alternately, HSC 3 may be
configured to reset HSC1 (quadrature) count on a marker input
Quadrature mode works much like the totalizer except the accumulator will automatically increment or
decrement based on the rotation phase of the two inputs. See the following example for more details.
Quadrature inputs are typically used for reporting the value of an encoder.
Two modes are available for quadrature that select whether the accumulator counts up or down when the
phase of input 1 leads input 2. Check your encoder’s documentation to determine the output form it uses
or try both modes to determine if the encoder counts up when expected.
Width Low
Period from Rising Edge
Period from Falling Edge