PCI-PIO
Seite 4
2.3
Counters
The PCI-PIO features three 32-bit counters allowing the connection of incremental encoders. The
counter inputs (A, B, and Reset) can be assigned to any digital lines of the two digital ports (configure
by software).
The PCI-PIO counts the number of incoming pulses (max. 16MHz) sampled at the connection of signal
A. If the maximum counting range is reached, the counter will be reset to the minimum value of the
counting range. If the external counter reset is connected, the counter can be reset at any time.
In comparison to a counter, the quadrature decoder considers the counting direction by decoding a
second phase-shifted signal.
To activate the counting function, the respective digital lines of the PCI-PIO must be assigned to the
counter via software.
Function
Description
Max. pulse frequ.
Connection
Pins/Counter
Counting range
Counter
count
16MHz
Signal A
1
0..2
32
-1
Up/Down counter
count
16MHz
Signal A, Signal B
2
-2
31
.. 2
31
-1
Incremental encoder count
4MHz
Signal A, Signal B
2
-2
31
.. 2
31
-1
Please refer to the relevant documentation of your product for further information about connecting
your incremental encoder.
