Emerson Bristol ControlWave Express Manual de usuario descargar pdf (Pagina 2)

Product Data Document

420DS-3d

July 16, 2007 - Page 2

Bristol

ControlWave

Designer

Remote Automation Solutions

Website: www.EmersonProcess.com/Remote

ACCOL III Function Block Library

Speeds Application Development

In addition to the basic functions and function

blocks, ControlWave Designer brings the beneift of

over twenty years of SCADA and plant control expe-

rience in Emerson’s Bristol ACCOL III function block

library. ACCOL III includes over sixty function blocks

valuable for use in oil & gas, water & waste and pro-

cess measurement & control applications. Further,

ACCOL III is designed to take full advantage of the

signicant features offered by ControlWave. Briey,

this library includes function blocks for:

Average, Compare, Totalize

Scheduling & Sequencing

PID & Lead/Lag

AGA gas ow and liquids calculations

Alarming and Historical Storage

File handling

Most of the ACCOL III function blocks offer the

same functionality available to Network 3000 RTUs,

controllers, and ow computers. This greatly simpli-

es migration to ControlWave for existing Network

3000 users. To further provide forward compat-

ibility, the ACCOL Translator converts most ACCOL

functions into ControlWave Designer Structured

Text, thus allowing you to leverage previous ACCOL

development.

Even without previous ACCOL experience, engi-

neers will appreciate the power of ACCOL III for

performing the most common process measurement

and control applications.

Alarm System

One of the most important functions of any process

automation system is to detect and report alarm

conditions. ControlWave Designer with ACCOL

III provides the capability of adding any analog or

logical variable to an alarm function block to detect,

time stamp, store and report analog limit, discrete

status, and change of state alarms.

•

Unlike most other systems, ControlWave detects,

time stamps and stores alarms locally in the control-

ler rather than at the PC level, ensuring that alarms

are detected even in the event of a communication

failure. Alarms are then reported to the PC once

the communication link is re-established. The Alarm

Record Queue size is congurable. The default is

one hundred alarms. Once full, the oldest alarms

will be maintained with time stamp. New alarms will

be logged but without a time stamp until some of the

older alarm space is freed through reporting. Alarms

are time stamped to 1 ms for internal action and

reported to the PC with a resolution of 20 ms.

The following alarm blocks and types are supported:

Analog Alarm Function Block

Detects High, High-High, Low and Low-Low

alarms

Independent deadbands are provided for high

and low alarms

Alarm reports may be enabled or disabled to

suppress nuisance alarms

Alarm Priority – Event, Operator guide, Non-

critical or Critical

Alarm descriptor text string

Reports single, momentary and multiple alarm

conditions since last report

Discrete Alarm Function Block

Detects selectable On or Off status

Alarm reports may be enabled or disabled to

suppress nuisance alarms

Alarm Priority – Event, Operator guide, Non-

critical or Critical

Alarm descriptor text string

Reports single, momentary and multiple alarm

conditions since last report

Change of State Alarm Function Block

Detects discrete change of state from On to Off

or from Off to On

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ControlWave 1
Designer 1

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