User`s guide

I/O Driver Blocks
4-23
- double — Counts the rising edges from both stripe sets
-
single — Counts the rising edges from one stripe set
-
quadruple — Counts rising and falling edges from both stripe sets
Quadruple mode yields four times more pulses per revolution than the single
mode. Therefore, quadruple is more precise and is recommended unless
other parameters dictate otherwise.
5 The encoder interface chip has a reset pin in addition to encoder inputs. This
pin is usually connected to the index output of the encoder. However, it can
be connected to any signal or not be used at all. The
Reset input function
specifies the function of this pin.
-
gate — Enables encoder counting
-
reset — Level reset of the encoder count
-
rising edge index — Resets the encoder count on the rising edge
-
falling edge index — Resets the encoder count on the falling edge
6 The encoder interface chip has a built-in lowpass filter that attempts to filter
out any high frequencies, which are interpreted as noise. The
Input filter
clock frequency
is the cutoff frequency (Hz) of this filter. The cutoff
frequency you specify is rounded to the nearest frequency supported by the
chip.
If the encoder is moving slowly and high-frequency noise is present, employ
the filter to eliminate the noise. This keeps the noise from being counted as
encoder pulses. If the encoder is moving quickly, the filter can filter out all of
the high-frequency pulses, including those you want to count. In this case,
consider leaving the filter disabled by setting the cutoff frequency to
Inf.
7 Do one of the following:
- Click
Apply to apply the changes to your model and leave the dialog box
open.
- Click
OK to apply the changes to your model and close the Block
Parameters: Encoder Input
dialog box.