Emerson Rosemount 3490 Series Reference Manual page 67

Reference Manual
00809-0100-4841
Figure 4-12: Transmitter Input Channel 1 for HART Input
P111 = "Tx1 : PV"
A
A. Txr HART Variables
B. Input Source Select
C. Apply Input Offset
D. Apply Input Scale
E. Profile Select
F. Non-Linear Profile
G. Post Scale NLP
H. Low Cut-off Check
I. Output Map
J. PV Damping
Optional damping of control unit PV ten times a second: D800 = [D800before +
((D800now - D800before)/(1+10 × P210))]
HART digital data is continuously read from the transmitter
The HART transmitter digitally communicates pre-calculated values of four HART variables
Primary Variable (PV), Secondary Variable (SV), Tertiary Variable (TV), and Fourth Variable
(FV) to the Rosemount 3490 Series Control Unit.
Selection of a HART variable as source for further processing
Parameter P111 selects one of the four HART variables (PV, SV, TV, or FV) on the
transmitter to be the source for further processing to get a result from Input Channel 1.
The unselected HART variables are mapped to control unit D80x parameters (see
4-12).
Note
In Figure
SV, Tx1: TV, or Tx1: FV can be selected.
Read-only parameters D80* are in the menu MONITOR → READINGS.
Applying the optional offset adjustment to the selected source
Parameter P112 is a positive, negative, or zero offset for adjustment of the selected HART
variable. As an example, this feature may be used to handle a standing level in a tank.
Note
P112 is in the menu:
SETUP → CONTROLLER → INPUT CHANNEL → Ch1 I/P Offset (on 3491/3) or SETUP →
CONTROLLER → PV CALCULATION → CHANNEL 1 → Ch1 I/P Offset (on 3492)
Emerson.com/Rosemount
P111 P112 P114
D900
PV, SV,
TV or FV
D901
B C D
D902
D903
SV, TV and FV
4-12, the selected source is the HART Primary Variable (PV). Alternatively, Tx1:
P115 P116
P113
F G
Scaled
E
Getting started
January 2021
P117
P210
I
(CH1 O/P)
(PV)
H D851 J
(SV)
D801
SV
(TV)
TV
D802
(FV)
FV
D803
Figure
D800
67