WI-I/O 9-K
v1.9
Page 38
supply.
Consider the above example,
with WI-I/O K #14. T his
module is mounted on a water
tank, and the analog input is a
level transducer. The WI-I/O K
is powered by a WI-BP-I/O-9-K
battery pack and to conserve
power, a measurement is taken
every 30 minutes (1800 sec).
The transducer requires a warm-
up time of 7 seconds to achieve
accuracy, so a value of 10
seconds is chosen.
In another application involving
the continuous monitoring of pressure in a pipeline, values of zero are chosen for the sample
time and warm-up time. The analog loop will be continuously active and a measurement is taken
every 0.5 sec. Because occasional pressure fluctuations caused a lot of transmissions, then the
sample time value was increased to 5 seconds, and a measurement was taken every 5 sec.
Because the warm-up time is still zero, the analog loop is continuously active.
4.5
Analog Setpoints
A high setpoint value and a
low setpoint value may be
entered. The internal
setpoint status is
determined by these values
in comparison to the analog
input value. If the analog
input is less than the low
setpoint, then the setpoint
status is "on". If the analog input is more than the high setpoint, then the setpoint status is "off".
When the input is between the low and high setpoints, then the setpoint status remains
unchanged.
The setpoint values may be set between 0 and 100% of the calibrated range. The low setpoint
may be set to the same value as the high setpoint, however the low setpoint should not be set to a
higher value than the high setpoint.
