Fisher FIELDVUE DVC6200f Instruction Manual page 7

Instruction Manual
D103412X012
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:
D 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.
D 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
D 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.
D Proportional‐Integral‐Derivative (PID) Function Block—The PID function block performs
proportional‐plus‐integral‐plus‐derivative control.
D 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.
D 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.
D 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.
D 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.
D 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.
D 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.
Introduction and Specifications
fieldbus Communication.
OUNDATION
July 2013
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