Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
4-20
Figure 4-17. HART Txr Input
Blocks and Parameters (Ch. 1)
Notes:
Parameters from the HART transmitter are available via the Control Unit from
P000 to P099 and D900 to D999. They are accessible from the DIRECT
menu and the MONITOR menu, selectable from the main menu.
D900 'Primary Variable' value from HART transmitter.
D901 'Secondary Variable' value from HART transmitter.
D902 'Tertiary Variable' value from HART transmitter.
D903 'Fourth Variable' value from HART transmitter.
P111 Channel 1 input source - select which HART variable is 'input source'.
P112 Channel 1 input offset - use for optional adjustment to the value from the
nominated 'input source'.
P113 Channel 1 profile selection. Keep the "Scaled" option unless requiring a
profile calculation (see “Profile Calculations for Contents and Flow
Applications“ on page 4-24.)
P114 Channel 1 scaling factor - for scaling the 'input source' value into
required units (P200). If PV value is the volume of liquid in a linear vessel, see
“Profile Calculations for Contents and Flow Applications“ on page 4-24 for use
of parameter P114.
P117 Channel 1 low cut-off - use for forcing D800 to zero whenever D851 is
less than P117
P20x Displayed units - P200 for PV (D800), P201 for SV (D801),
P202 for TV (D802), and P203 for FV (D803).
P210 Optional damping of MCU PV where:
D800 = [D800before + ((D800now - D800before)/(1+10 * P210))]
This is calculated 10 times a second before the MCU PV value is finalized.
For an explanation of P115 and P116, see “Profile Calculations for Contents
and Flow Applications“ on page 4-24.
D800 is the PV (Process Variable) value of the 3490
D801 value is the same value as D901
D802 value is the same value as D902
D803 value is the same value as D903
Input
Source
Select
P111
D900
Txr
HART
Variables
D901
D902
D903
PV, SV,
TV or FV
P112
Apply
Input
Offset
P114
Apply
Input
Scale
(SV)
D801
(TV)
D802
(FV)
D803
SV, TV and FV
Low
Cut-off
Check
D800
Profile
Select
P113
Scaled
Profiles
Non-Linear
Profile
Post
Scale
NLP
(PV)
Output
Map
P117
SV
P115 P116
TV
FV
D851
(CH1 O/P)
P111 = “Tx1 : PV”
PV
Damping
P210
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