Emerson Rosemount 3490 Series Reference Manual page 142

Service and troubleshooting
January 2021
Related information
Electrical installation
5.3.6 Monitoring the control unit readings
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Table 5-1: Control Unit Readings
Category Parameter
Answers D800 PV
D801 SV
D802 TV
D803 FV
D804 Ullage
D805 % Current
Output
D806 Current O/P
Rate of change D809 Rate of Change This indicates the calculated rate of change of the
142
MONITOR → [CONTROLLER] → READINGS
Description
(1)
This is the live control unit Primary/Process Value
(PV).
(1)
This is the live control unit Secondary Value (SV).
(1)
This is the live control unit Third/Tertiary Value
(TV).
(1)
This is the live control unit Fourth Value (FV).
This indicates 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 control unit PV i.e.
D804 = (P401 - D800).
This indicates the present amount of electrical
current being output from the 4–20 mA Current
Output as a percentage.
Note
The output current is while the control unit is in
the Program operating mode.
This indicates the present amount of electrical
current being output from the 4–20 mA Current
Output as a mA value.
control unit PV. See also
relay for how to use parameter D809.
Rate of change mode
Reference Manual
00809-0100-4841
MENU
ANSWERS → PV
ANSWERS → SV
ANSWERS → TV
ANSWERS → FV
ANSWERS → Ullage
ANSWERS → % Current
Out
ANSWERS → Current
Output
Rate of Change
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