WI-I/O 9-K
v1.9
Page 40
4.7
Pulse Inputs
Each WI-I/O K has two pulse inputs. Each pulse input has 2 x 16 bit counters and a calculated
pulse rate value. The 2 x 16 bit counters are a base counter which increments on each pulse, and
an “HI” counter which increments each time the base counter overflows. Either or both counters
can be transmitted, although each is transmitted individually.
There are several configurable parameters for pulse inputs. The paralysis value can be adjusted
from the Unit Details selection, as per Digital Inputs.
The pulse inputs also have a Sensitivity
value. The pulse input sensitivity is the
number of pulse increments since the last
transmission to trigger another
transmission. For example, if the pulse
count at the last transmission for a pulse
input was 1000, and the sensitivity value
is 10, then another transmission will
occur when the pulse count reaches 1010
(provided there has not been an update transmission during this period). The sensitivity values
can be between 1 and 32000.
If either pulse input has an input rate of more than 10Hz, then the Fast Pulse Input option should
be selected from the Pulsed Inputs selection. This is selected at “Pulse Input 1 Count” even if
you are using PI2. That is, if either PI1 or PI2 is faster than 10Hz, select “Enable Fast Pulse
Inputs” for PI1. Selecting Fast PI will increase the power consumption of the WI-I/O K and is
not suitable for battery supplies.
PI2 has a user-configurable divider for scaling its pulse counters. PI1 does not have a divider.
The PI2 divider can be an integer from 1 – 255. If the divider is set to X, then the base counter
will increment by 1 for every X input pulses.
