Eaton XNE-2CNT-2PWM, Руководство пользователя

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4 Functions of the count inputs (CNT1 and CNT2)
4.1 Basic functions of the count inputs CNTx
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XI/ON: XNE-2CNT-2PWM 04/2011 MN05002035Z-EN www.eaton.com
Time span between direction signal (B) and count signal (A)
For pulse generators with a direction signal, it must be ensured that there is a gap of at least
1,25
μ s or 4 μ s between the direction signal (B) and the counter signal (A), depending on the
input filter configured.
Operation mode: AB mode:
In the AB mode, pulse and direction are determined by the phasing of the input signals Ax and
Bx.
The counter counts upwards, if the signal sequence is run through from the left to the right
(pos. count direction). The counter counts upwards, if the signal sequence is run through from
the left to the right (neg. count direction).
The points in the following figure mark the scan points (change in count value) depending on
the parameterization.
Figure 9:
Time span be-
tween direction
signal (B) and
count signal (A)
Figure 10:
AB mode
signal A
1,25 µs / 4 µs
signal B
(direction)
time
Signal A
Signal B
Single evaluation
Double evaluation
Quadruple evaluation
Neg. count direction Pos. count direction