Fisher FIELDVUE DVC6200 Instruction Manual page 31

Commissioning the Digital Valve
Controller for use with the HART
Tri-Loop Signal Converter
To prepare the digital valve controller for use with a
333 HART Tri-Loop, you must configure the digital
valve controller to burst mode, and select Burst
Command 3. In burst mode, the digital valve controller
provides digital information to the HART Tri-Loop
HART-to-Analog Signal Converter. The HART
Tri-Loop converts the digital information to a 4 to 20
mA analog signal. Each burst message contains the
latest value of the primary (analog input), secondary
(travel target), tertiary (configured output pressure),
and quaternary (travel) variables.
To commission a DVC6200 for use with a HART
Tri-Loop, perform the following procedures.
Note
Instrument level AC does not support
HART Command 3 or Burst Mode
communications.
September 2010
Set the Burst Operation
1. From the Online menu, select Configure / Setup,
Detailed Setup, Mode and Protection, and Burst
Mode.
2. Select Burst Enable. Select Enable then press
ENTER and SEND.
3. Select Burst Command. Select the desired
command (HART Univ Command 3).
4. Select Cmd 3 Press. Select the pressure you
desire the HART Tri-Loop to use as the tertiary
variable.
Command 3 provides the following variables:
Primary variable—analog input in % or ma,
Secondary variable—travel target in % of ranged
travel,
Tertiary variable—supply or output pressure in psig,
2
bar, kPa, or kg/cm . Select Select Cmd 3 Press from
the Burst menu to select if the output A, output B,
differential (A−B), or supply pressure is sent.
Quaternary variable—travel in % of ranged travel.
Installation
(1-2-1-4)
23
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