User guide

I-E67-84-1B February,2002 8-18
to increment the blinking digit and the
Key to move to the next digit, and
press the ENTER Key to enter the new
value.
4) Set the process variable value for the 20
milliampere point using the Key to
increment the blinking digit and the
Key to move to the next digit, and press
the ENTER Key to enter the new value.
5) Select the LINEAR Output State using the
SELECT Key for Advanced configurations.
For Basic configurations, this step will
not be accessible.
Non-Linear Output State (Advanced)
The Non-Linear Output State sets the end point
and break point values for a non-linear output
function. The default values for the output
represent the full scale process variable
range (e.g.,0 to 14 or -1999 to +1999 mV) and
the break points are set for a linear output
(e.g., 20% input equals 20% output).
To define the break point values, a plot of
the process variable against the desired
output (or variable that represents the output
value) must be segmented into six linear
regions that best fit the non-linear
relationship. The points where the linear
regions intersect should fall on the non-
linear function and represent the break points
that are entered into Non-Linear Output State.
As with the Linear Output State, the output
range must be defined and will represent the
0% input/0% output and 100% input/100% output
points. Since the 0% and 100% points are
defined by the output range, the break point
information (e.g., X-1/Y-1, X-2/Y-2, etc.
values) should not include the 0% input/0%
output and 100% input/100% output values and
must be entered as percentage of input range
and output span. Also as with a linear
output, a reverse acting non-linear output can
be implemented by reversing the zero or four
and 20 milliampere process variable and break
point values (e.g., 1999 mV for the 4
milliampere value and -1999 mV for the 20
milliampere value).
Set the Analog Output One Non-Linear State
using Figure 8-5 as a reference and the
following procedure: