CLS200 Series User’s Guide
Chapter 4: Setup
80
Low Process Variable
Set a low process variable for input scaling purposes. The low process variable and the low reading
(
LO RDG
) together define one of the points on the linear scaling function’s conversion line. Set
LO
PV
to the value you want displayed when the signal is at the level set for the low reading (
LO RDG
).
ALARM
01 INPUT SCALING
LO PV ? 0
Selectable values:
Any value between the minimum process variable and the high process variable
for the selected display format. See
Table 4.9
on the previous page.
Low Reading
Enter the input signal level that corresponds to the low process variable (
LO PV
) you entered in the
previous parameter.
ALARM
01 INPUT SCALING
LO RDG? 0.0%FS
Selectable values:
For linear inputs, any value between -99.9% and 999.9% percent of full scale,
where 100% corresponds to 60mV and 0% corresponds to 0mV. For pulse inputs, any value
between
0
and
2000 HZ
. The low reading must be less than the high reading (
HI RDG
).
Input Filter
The controller has two types of input filtering:
• The rejection filter ignores sensor readings outside the acceptance band when subsequent
readings are within the band. For temperature sensors, the band is ±5° about the last
accepted reading. For linear inputs the band is ±0.5% of the input range. This filter is not
adjustable.
• A simulated resistor-capacitor (RC) filter damps the input response if inputs change
unrealistically or change faster than the system can respond. If the input filter is enabled, the
process variable responds to a step change by going to 2/3 of the actual value within the
number of scans you set.
ALARM
01 INPUT FILTER?
3 SCANS
Selectable values:
0
to
255
scans.
0
disables the filter.
