I2773-4.
4
en
111
Somat eDAQ
lite
6.2.2
Pulse Counter
For the ELDIO, the eDAQ
lite
allows two pulse counter channels on each of the three
connectors (i.e., bits |1-4|, |5-8| and |9-12|). Note that the quadrature decoder mode
requires two adjacent input bits (i.e., 1-2 or 3-4 for the first connector) and the odd
numbered input connector pin is typically designated encoder output A, while the even
numbered input connector pin is typically designated encoder output B.
For ELDIO pulse counters, the connector selection is different from other input
channels. For each pulse counter, select the ELDIO layer from the board drop down
list, bank and connector using the corresponding radio button and input bit from the
provided drop down list.
For more information on ELDIO pulse counters, see
.
NOTE
Because the quadrature decoder mode requires two input bits, it is recommended to
define these pulse counter first before other types of pulse counter channels.
Output Data Type
Select an output data type of 32-bit float, 32-bit unsigned or 32-bit integer. The 32-bit
float data type allows any of the operational modes. The 32-bit unsigned type limits the
available operational modes to time period, on time and pulse rate while the 32-bit
integer type is available only with the quadrature decoder mode. The 32-bit unsigned
and integer data types are considerably more efficient from a processing point of view.
NOTE
If the quadrature decoder input channel is expected to exceed about 16000000 counts
then using the 32-bit integer data type is required since the 32-bit float data type starts
to lose resolution around this count. To put this in some perspective, a 2048 counts per
revolution quadrature encoder on a shaft rotating at 3000 RPM accumulates
16000000 counts in about 2.5 hours; however, it takes about 350 hours to accumulate
2147483647 counts, the maximum value of the 32-bit integer data type.
Mode
There are several operational modes available for the pulse counter channel.
HBM: public
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