Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
4-22
The final output of Input Channel 1 is readable on D800 and is the PV of the
3490 Series Control Unit, which is shown on the (factory default) display.
Figure 4-18. HART Input Blocks
and Parameters (Channel 2)
Notes:
Parameters from the HART transmitter are available on the 3490 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
P121 Channel 2 input source - select which HART variable is 'input source'.
P122 Channel 2 input offset - use for optional adjustment to the value from
the nominated 'input source'.
P123 Channel 2 profile selection. Keep the "Scaled" option unless requiring a
profile calculation (see Section “Profile Calculations for Contents and Flow
Applications“ on page 4-24.)
P124 Channel 2 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 (CH1) / P124 (CH2)
P127 Channel 2 low cut-off - use for forcing D800 to zero while D852 < P127
P20x Displayed units - P200 for PV (D800), P201 for SV (D801), P202 for TV
(D802) and P203 for FV (D803).
P210 Optional damping of PV where:
D800 = [D800before + ((D800now - D800before)/(1+10 * P210))], @ 10 Hz
For description of P125 and P126, see P115 and P116 in the section “Profile
Calculations for Contents and Flow Applications“ on page 4-24.
D800 is the PV (Process Variable) value of the 3490 Series Control Unit
D801 value is the same value as D851
D802 value is the same value as D852
D803 value is the same value as the transmitter variable selected by P151
Input
Source
Select
P121
D900
Txr (Tx2)
HART
Variables
D901
D902
D903
PV, SV,
TV or FV
P122
Apply
Input
Offset
P124
Apply
Input
Scale
(SV)
D801
(TV)
D802
(FV)
D803
Low
Cut-off
Check
D800
Profile
Select
P123
Scaled
Profiles
Non-Linear
Profile
Post
Scale
NLP
(PV)
P127
P150
D851
(CH1 O/P)
P125 P126
D852
(CH2 O/P)
FV
Select
Tx1
Tx2
PV, SV,
TV and FV
PV, SV,
TV and FV
P151
PV
Damping
P210
P121 = “Tx2 : PV”
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