Emerson Fisher Fieldvue DVC6020f User Manual

AO Function Block
March 2006
5-69
B2718-1 / IL
CAS_IN, 2
OUT
SP
Time
Figure 5-10. Analog Output Function Block Timing Diagram
SP RATE UP
SP
RATE DN
1 second 1 second 1 second 1 second
1 macrocycle
1 macrocycle
TRANSDUCER BLOCK
TRAVEL TARGET
options, the tracking options, and the conversion and
status calculations.
Output Block PV Status
The Output Block PV Status is determined by the
enabled status of the Resource Block parameter
FEATURE_SEL [18], the Transducer Block mode, and
enabled Active PlantWeb alarms. Refer to table 5-1.
Set Point Selection and Limiting
To select the source of the SP [8] value use the
MODE [5] attribute. In Automatic (Auto) mode, the
local, manually-entered SP [8] is used. In Cascade
(Cas) mode, the SP [8] comes from another block
through the CAS_IN [17] input connector. In
RemoteCascade (RCas) mode, the SP [8] comes from
a host computer that writes to RCAS_IN [28]. The
range and units of the SP [8] are defined by the
PV_SCALE [11] attribute.
In Manual (Man) mode the SP [8] automatically tracks
the PV [7] value when you select the SP-PV Track in
Man I/O option. The SP [8] value is set equal to the
PV value when the block is in manual mode, and is
enabled in IO_OPTS [14]. You can disable this option
in Man or OOS mode only.
The SP [8] value is limited to the range defined by the
setpoint high limit attribute (SP_HI_LIM [20]) and the
setpoint low limit attribute (SP_LO_LIM [21]).
In Auto mode, the rate at which a change in the SP [8]
is passed to OUT [9] is limited by the values of the
setpoint upward rate limit attribute (SP_RATE_UP
[19]) and the setpoint downward rate limit attribute
(SP_RATE_DN [18]). A limit of zero disables rate
limiting, even in Auto mode.
As shown in figure 5-10, the block executes a
percentage of the set point change each macrocycle.
For example, if the set point rate is set at 10% per
second and the macrocycle is 500 milliseconds (0.5
seconds or 50% of 1 second), then during the first
macrocycle the set point will change 5% (50% of the
10% per second rate). If the macrocycle is 750
milliseconds (0.75 seconds or 75% of 1 second), then
during the first macrocycle the setpoint will change
7.5% (75% of 10).
When the transducer block receives the setpoint
change from an AO block with rate limits, it will
smoothly move the valve to the requested setpoint at
the rate limit configured in the AO block.
In Auto mode, the converted SP [8] value is stored in
the OUT [9] attribute. In Man mode, the OUT [9]
attribute is set manually, and is used to set the analog
output defined by the CHANNEL [22] parameter.
You can access the actuator position associated with
the output channel through the READBACK [16]
parameter (in OUT units) and in the PV [7] attribute (in
5

Emerson Fisher Fieldvue DVC6020f Specifications

General

Brand	Emerson
Model	Fisher Fieldvue DVC6020f
Category	Controller
Language	English

Summary

Errata Sheet

DVC6000f Quick Start Guide Correction

DVC6000f Instruction Manual Corrections

Instruction Manuals dated March 2006 and March 2005

Instruction Manuals dated December 2004

NEPSI Approvals and Hazardous Location Instructions

Special Instructions for Safe Use and Installations in Hazardous Locations

Details specific installation requirements and conditions for safe use based on agency approvals.

NEPSI Intrinsic Safety Notes

Provides notes for safe use of certified products, including Ex marking and certificate number.

Installation Overview

Special Instructions for Safe Use and Installation in Hazardous Locations

Provides safety instructions tailored for specific hazardous location certifications like CSA, FM, ATEX, and IECEx.

Mounting Instructions

Details mounting procedures for various DVC6000f series digital valve controllers on different actuator types.

375 Field Communicator Basics

Online Operation

Basic Setup and Tuning

Basic Setup Procedures

Covers essential setup steps including Transducer Block Mode, Protection, and Setup Wizard.

Auto Travel Calibrate

Procedure to automatically calibrate the instrument's travel using valve and actuator stops.

Tuning - Stabilize/Optimize

Method to improve valve response by adjusting tuning sets for instability or sluggishness.

Detailed Setup / Blocks

Resource Block

Details the hardware-specific characteristics and operational parameters of the DVC6000f Series digital valve controller.

Transducer Block

Explains how the transducer block accepts signals, performs setup, calibration, and diagnostics.

Analog Output (AO) Function Block

PID Function Block

Input Selector (ISEL) Function Block

Output Splitter (OS) Function Block

Analog Input (AI) Function Block

Multiple Analog Input (MAI) Function Block

Discrete Output (DO) Function Block

Discrete Input (DI) Function Block

Calibration Procedures

Travel Calibration

Covers procedures for calibrating valve travel, including Auto and Manual methods.

Relay Adjustment

Travel Sensor Adjust

Provides procedures for adjusting the travel sensor, including methods using a multimeter or Field Communicator.

Pressure Sensor Calibration

Describes calibration procedures for supply, output A, and output B pressure sensors.

Maintenance and Troubleshooting

Instrument Troubleshooting

Provides guidance on diagnosing and resolving common instrument issues.

Module Base Maintenance

Details procedures for removing and replacing the module base assembly.

Submodule Maintenance

Covers maintenance for submodules like I/P converter, PWB assembly, and pneumatic relay.

Travel Sensor Replacement

Operating with DeltaV

Getting Started with DeltaV Host Systems

Starting Methods

Accessing Parameters

Simulate PlantWeb Alarms