Rosemount 3491, Reference Manual, Page: 112 / 152

Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
5-4
Monitoring The 3490 Series Control Unit Readings
Menu:
MAIN MENU / MONITOR / [CONTROL UNIT /] READINGS
Answers:
D800 PV ANSWERS / PV
This is the live PV (Process Variable) value as seen in Section “Transmitter
inputs to the 3490” on page 4-13.
D801 SV ANSWERS / SV
This is the live (3490) SV value as seen in Section “Transmitter inputs to the
3490” on page 4-13.
D802 TV ANSWERS / TV
This is the live (3490) SV value as seen in Section “Transmitter inputs to the
3490” on page 4-13.
D803 FV ANSWERS / FV
This is the live (3490) FV value as seen in Section “Transmitter inputs to the
3490” on page 4-13.
D804 Ullage
This is an indication of by how much a vessel or open-channel falls short of
being full. It is calculated as the difference between the upper range value
(URV) of the Current Output and the PV value i.e. D804 = (P401 - D800)
D805 % Current Output ANSWERS / % Current Out
This is the percentage of actual current from the 4-20mA output of the 3490
Series Control Unit.
NOTE:
The current output is frozen when the 3490 Series Control Unit is in the
Off-line operating mode.
D806 Current O/P ANSWERS / Current Output
Actual current output from the 4-20mA output of the 3490 Series Control Unit.
NOTE:
The current output is frozen when the 3490 Series Control Unit is in the
Off-line operating mode.
Rate of change:
D809 Rate of change Rate of Change
This displays the calculated Rate of Change of the PV value. See also “Rate
of Change Relay” on page 4-53 for use of parameter D809.
Relay:
D811 RL1 Ops RELAY / RELAY OPERATIONS