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26
Reference Manual
00809-0100-4140, Rev AA
January 2017
Note
When messages about the loop appear, take appropriate safe action and select “
”.
See
“Configuration basics” on page 10
for further information.
2.8.8
Analog output range points
The analog output is driven by a device variable mapped to the Primary Variable (“PV”).
Carefully read displayed warnings that appear before applying changes.
This section is for entering the range points for the PV to be output using the analog output.
The
Lower Range Value (LRV)
variable is the PV represented by 4 mA, and the
Upper
Range Value (URV)
variable is the PV represented by 20 mA. This PV range can be a sub-set
of the sensor limits defined by
Upper PV Limit
and
Lower PV Limit
variables (see
).
However, by default, the
Output State
is mapped to the PV. The range points for this are
read-only and identical to the associated sensor limits (see
If supported,
Sensor Frequency
or
Scaled Variable
can instead be re-mapped to the PV.
The range points then automatically change from read-only to editable, allowing range
points to be changed, but are subject to the sensor limits (see
).
Optionally, use
Scaled Variable Damping
(
) to smooth out large steps in output
current changes when the PV is a scaled variable.
“Site calibration of analog output” on page 70
for other related information.
Entering range points (Field Communicator)
1.
From the Home screen, select
2: Configure
.
2.
Select
2: Manual Setup >
2: Analog Output >
2: Set Range Points
.
3.
Enter the PV value at 20 mA in the
2: Upper Range Value
variable.
4.
Enter the PV value at 4 mA in the
3: Lower Range Value
variable.
Note
At the
4: Readings
menu (2, 2, 2, 4), the
1: Analog Output
item indicates the live output
current. The
2: Percent of Range
item indicates the percentage of that output current in
terms of the complete 4–20 mA range. For example, 8 mA is 25% of range, 12 mA is 50%
Note
When messages about the loop appear, take appropriate safe action and select “OK”.
See
“Configuration basics” on page 10
for further information.
Fast keys
2, 2, 2, 2
Summary of Contents for Rosemount 2140
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