Emerson Fisher FIELDVUE DVC6000f, Instruction Manual

Page: 265 / 384

Viewing Device Variables and Diagnostics
December 2009 6-11
Setpoint Status
Shows the Foundation Fieldbus status of Setpoint
Value (FINAL_VALUE.STATUS [13.2]); Good,
Uncertain, or Bad.
Travel (DeChar)
Travel (FINAL_POSITION_VALUE.VALUE [17.2])
shows the value of the travel in % (percent) of ranged
travel. Travel always represents how far the valve is
open.
AO Control-Post Characterization
(TB
>
Device Variables
>
AO Control-Post Char)
Travel Target
Travel target is the output from the characterization
function.
Travel
Travel (TRAVEL.VALUE [34.2]) displays the actual
position of the valve in percent (%) of calibrated travel.
Travel Status
Shows the Foundation Fieldbus status of Travel Value
(TRAVEL.STATUS [34.1]); Good, Uncertain, or Bad.
DO Control
(TB
>
Device Variables
>
DO Control)
Setpoint(D)
Discrete Setpoint (SETPOINT_D.VALUE [32.2])
shows the value of the setpoint in discrete values.
0 = closed, 1 = open, 5, 10, 15... = setpoint in 5%
units. This parameter will be written directly if the
transducer block is in MAN mode, or will be written
automatically by the DO block if the transducer block
is in AUTO mode.
Travel(D)
Travel (TRAVEL_D.VALUE [33.2]) shows the value of
the setpoint in discrete values. 0 = closed, 1 = open,
5, 10, 15... = setpoint in 5% units.
Input Characterization
(TB
>
Device Variables
>
Input Characterization)
Input Characterization (INPUT_CHAR [50]) defines
the relationship between the setpoint specified by the
output function block and the desired valve position.
Travel/Pressure State
(TB
>
Device Variables
>
Travel/Pressure State)
Travel/Pressure State (TVL_PRESS.STATE [41.2])
indicates if the instrument is being used for travel
control (position control) or as an I/P (pressure control)
PD Inside Status
(TB
>
Device Variables
>
PD Inside Status)
PD Inside Status shows the status of Performance
Diagnostics.
Protection
(TB
>
Device Variables
>
Protection)
Indicates the status of Protection.
Drive Signal
(TB
>
Device Variables
>
Drive Signal)
Drive Signal (DRIVE_SIGNAL [53]) indicates the drive
signal, as a percentage of the maximum drive
available, going to the I/P converter from the printed
wiring board. In most applications, the drive signal
ranges between 50% and 75% of the maximum drive
signal.
Temperature
(TB
>
Device Variables
>
Temperature)
Temperature (TEMPERATURE [48]) displays the
internal temperature of the instrument in either
degrees Fahrenheit or Celsius.
Cycle Counter
(TB
>
Device Variables
>
Cycle Counter)
Cycle Counter (CYCLE_COUNT [73]) records the
number of times the travel changes direction. The
change in direction must occur after the deadband has
been exceeded before it can be counted as a cycle.
Travel Accumulator
(TB
>
Device Variables
>
Travel Accumulator)
Travel Accumulator (TRAVEL_ACCUM [72]) indicates
the total change in travel, in percent of ranged travel.
The accumulator only increments when travel exceeds
the deadband. Then the greatest amount of change in
one direction from the original reference point (after
the deadband has been exceeded) will be added to
the Travel Accumulator.
Travel Count
(TB
>
Device Variables
>
Travel Count)
Travel Count (TVL_COUNT [43.1]) is the Travel
Sensor readback displayed in A/D counts.
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