Introduction; Product Overview; Purpose Of This Document; Abbreviations And Definitions - Fisher FIELDVUE DVC2000 Instruction Manual Supplement

DVC2000 Digital Valve Controller
September 2017

Introduction

Product Overview

The DVC2000 digital valve controller is a communicating, microprocessor-based current-to-pneumatic valve
positioner. It is designed to replace standard pneumatic and electro-pneumatic valve positioners.
In addition to the traditional function of converting an input current signal (4-20 mA) to a pneumatic output pressure,
the DVC2000 digital valve controller communicates via a local display panel and/or via the HART protocol. An option is
available which provides isolated circuitry for two (2) integrated limit switches (for open/close valve indication) and a
valve position transmitter (for separate valve position feedback).

Purpose of this document

This specification is designed to be a technical reference for HART capable host application developers, system
integrators and knowledgeable end-users. It also provides functional specifications (e.g., commands, enumerations
and performance requirements) used during field device development, maintenance and testing. This document
assumes the reader is familiar with HART Protocol requirements and terminology. Additional product information is
available in DVC2000 product literature, available from Emerson Automation Solutions.

Abbreviations and definitions

AR Alert Record
Variables which represent nonvolatile values of manufacturing­initialized data or user­specified
Configuration
configuration information. These variables cannot be enumerated via Command 54 and as such
Variables
stand on their own with no associated units or range information.
Measured variables that are exposed to HART and can be enumerated using Command 54.
Generally there are variables whose ID is in the range of 0 to 10 and are associated with units
Device Variable
codes, status, and range values.
Enumeration A pre-defined set of values or text.
MV Measured Variable, a physical input to the instrument.
Named Variable – a logical point inside the device, hard­mapped to a given MV as the source of
NV
NV data.
A term that applies to diagnostic data packets. It is defined as a collection of periodically sampled
Point
variables captured at a single instant in time. It does not include the "Monitor" point.
PS1 The PORT A output pressure which increases with increasing drive signal.
PS2 The PORT B output pressure which decreases with increasing drive signal.
PST Partial Stroke Test, a limited form of ramped valve diagnostic.
Byte An 8­bit unsigned integer.
Word A 16­bit unsigned integer.
Float Refers to the IEEE 754 floating point format.
A special form of characters defined by HART in which 6­bit ASCII characters are packed into byte
Packed ASCII
data.
Standard Span A proprietary 16­bit integer format for numerical values used by some of this device's Device
Format Specific commands.
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Instruction Manual Supplement
D103783X012