User Manual v1.9
Manual
WI-I/O 9-K
v1.9
Page 43
4.7.1
Manually Setting Counter Values
The values in the counters can be manually set to any value - refer to section 5.3.2 of this
manual.
4.7.2
Shaft Encoder Inputs
If the pulse inputs are connected to a shaft encoder (incremental or quadrature types), then the
Shaft Encoder Inputs option should be selected. The WI-I/O K will then look at both pulse input
signals and calculate a “position” value for the shaft encoder.
If an incremental encoder is used, then the correct counter value will be stored in the PI1
counter. If a quadrature encoder is used, the value will be stored in the PI2 counter. Note that
you don’t need to select which type of encoder is used. The WI-I/O K will calculate both values.
Only the base counters should be used; do not use the Hi or overflow counters.
If the pulse rate from the encoder is greater than 10Hz, then Fast Pulse Inputs should be selected
as for normal pulse inputs. The scaling divider for PI2 must be set to 1.
To physically set up the shaft encoder, set the shaft encoder to the middle of the range, then
manually set the counter value to the value required (refer section 5.3.2). As the encoder moves
up and down, the counter value will increase or decrease.
4.7.3
Pulse Rates
The WI-I/O K calculates the
rate of the pulse inputs and
makes these values available
to be mapped as internal
analog inputs. For PI2, the
pulse rate is calculated on the
scaled counter - that is, after
the input is divided. The
maximum rate that can be
calculated for both inputs is
1000Hz.
The maximum value of the
pulse rate is user-configurable.
That is, you select the
maximum rate that corresponds
to 100% of the analog value.
For example, if the normal
pulse rate is 35Hz, you may
decide that the maximum
signal should be 50Hz. The
WI-I/O K will then transmit
