DVC2000 Digital Valve Controller
July 2009
5-2
Viewing Variables
Note
These variables are not available for
instrument level AC.
Analog Input, Travel, Valve Set Point,
Drive Signal and Output Pressure
The following variables are displayed on the Online
menu:
Analog In shows the value of the instrument analog
input in mA (milliamperes) or % (percent) of ranged
input.
Travel shows the value of the DVC2000 digital valve
controller travel in % (percent) of ranged travel. Travel
always represents how far the valve is open.
Valve SP shows the requested valve position in % of
ranged travel.
Drive Sgl shows the value of the instrument drive
signal in % (percent) of maximum drive.
Pressure shows the value of the instrument output
pressure in psi, bar, or kPa.
Additional Instrument Variables
Note
These variables are not available for
instrument level AC.
The Variables menu is available to view additional
variables, such as the status of the auxiliary input, the
instrument internal temperature, cycle count, travel
accumulation and device free time. To view one of
these variables, from the Online menu select Setup &
Diag, Display, and Variables. If a value for a variable
does not appear on the display, select the variable and
a detailed display of that variable with its value will
appear. A variable’s value does not appear on the
menu if the value becomes too large to fit in the
allocated space on the display, or if the variable
requires special processing, such as Free Time.
Temp—The internal temperature of the
instrument is displayed in either degrees Fahrenheit or
Celsius.
Cycl Count—Cycle Counter displays the number
of times the valve travel has cycled. Only changes in
direction of the travel after the travel has exceeded the
deadband are counted as a cycle. Once a new cycle
has occurred, a new deadband around the last travel
is set. The value of the Cycle Counter can be reset
from the Cycle Count Alert menu.
Tvl Accum—Travel Accumulator contains 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. The value of the Travel
Accumulator can be reset from the Travel Accum Alert
menu.
Free Time—Free Time is the percent of time that
the firmware is idle. A typical value is 25%. The actual
value depends on the number of functions in the
instrument that are enabled and also on the amount of
communication currently in progress.
Viewing Device Information
The Device Information menu is available to view
information about the instrument. From the Online
menu, select Setup & Diag, Display, and Device
Information. Follow the prompts on the Field
Communicator display to view information in the
following fields: HART Univ Rev (HART Universal
Revision), Device Rev (Device Revision), Firmware
Rev (Firmware Revision), Firmware Date, Main Elect
Rev (Main Electronics Revision), Sec Elec Rev
(Secondary Electronics Revision), Sensor Serial Num
(Sensor Serial Number), Inst Level (Instrument Level),
and Device ID.
HART Univ Rev—HART Universal Revision is
the revision number of the HART Universal
Commands which are used as the communications
protocol for the instrument.
5
Содержание Fisher FIELDVUE DVC2000
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Страница 71: ...Parts July 2009 7 1 7 7 Section 7 Parts Parts Ordering 7 2 Parts Kits 7 2 Parts List 7 2 7 ...
Страница 77: ...Principle of Operation July 2009 A 1 A A Appendix A Principle of Operation DVC2000 Operation A 2 A ...
Страница 80: ...DVC2000 Digital Valve Controller July 2009 A 4 A ...
Страница 104: ...DVC2000 Digital Valve Controller July 2009 Index 8 C Index ...
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