Emerson FIELDVUE DVC6200f, Instruction Manual

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Introduction and Specifications
November 2010 3
W9616_fieldbus
Figure 1-2. FIELDVUE DVC6200f Digital Valve Controller
Integrally Mounted to a Fisher GX Control Valve and
Actuator System
Advanced Diagnostics (AD)
Fieldbus Diagnostics (FD)
Performance and Advanced Diagnostics are available
with ValveLink software. They provide visibility to
instrument alerts. Fieldbus Diagnostics can be viewed
with any host system.
Instrument Blocks
The digital valve controller is a block-based device.
For detailed information on the blocks within the digital
valve controller, see the Detailed Setup section of this
manual.
The DVC6200f digital valve controller includes the
resource and transducer block:
Resource Block—The resource block contains
the hardware specific characteristics associated with a
device; it has no input or output parameters. The
resource block monitors and controls the general
operation of other blocks within the device. For
example, when the mode of the resource block is Out
of Service, it impacts all function blocks.
Transducer Block—The transducer block
connects the analog output function block to the I/P
converter, relay, and travel sensor hardware within the
digital valve controller.
Function Blocks
In addition to the resource and transducer block, the
digital valve controller may contain the following
function blocks. For additional information on function
blocks, refer to Appendix D, F
OUNDATION
fieldbus
Communication.
Analog Output (AO) Function Block—The
analog output function block accepts the output from
another function block (such as a PID block) and
transfers it as an actuator control signal to the
transducer block. If the DO block is selected, the AO
block is not functional.
Proportional-Integral-Derivative (PID)
Function Block—The PID function block performs
proportional-plus-integral-plus-derivative control.
Input Selector (ISEL) Function Block—The
input selector function block selects from up to four
inputs and may provide the selected signal as input to
the PID block. The input selection can be configured
to select the first good input signal; a maximum,
minimum or average value; or a hot spare.
Output Splitter (OS) Function Block—The
output splitter function block accepts the output from
another function block (such as a PID block) and
creates two outputs that are scaled or split, according
to the user configuration. This block is typically used
for split ranging of two control valves.
Analog Input (AI) Function Block—The analog
input function block monitors the signal from a
DVC6200f sensor or internal measurement and
provides it to another block.
Multiple Analog Input (MAI) Function
Block—The Multiple Analog Input (MAI) function block
has the ability to process up to eight DVC6200f
measurements and make them available to other
function blocks.
Discrete Output (DO) Function Block—The
discrete output function block processes a discrete set
point and sends it to a specified output channel, which
can be transferred to the transducer block for actuator
control. In the digital valve controller, the discrete
output block provides both normal open/closed control
and the ability to position the valve in 5% increments
for course throttling applications. If the AO block is
selected, the DO block is not functional.
Discrete Input (DI) Function Block—The
discrete input function block processes a single
discrete input from a DVC6200f and makes it available
to other function blocks. In the digital valve controller,
the discrete input function block can provide limit
switch functionality and valve position proximity
detection.
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