DeltaV Inspect.pdf

Product Data Sheet

DeltaV Inspect

July 2002—Page 1

DeltaV Inspect

Let DeltaV Inspect help keep your plant’s control healthy.

Keeps tabs on the health of process

equipment and instrumentation

DeltaV Inspect identifies and quantifies the following

conditions and presents them graphically: loop

utilization; bad, uncertain and limited measurement

status; control limited; and abnormal process

variability. This functionality, combined with an easy-

to-use, no configuration required interface, ensures a

finely tuned process that produces on spec products at

optimal cost.

Automatically Identifies problem areas

Monitors the pulse of your plant

Requires no configuration

Introduction

Don’t let poorly tuned loops and malfunctioning field

devices compromise control quality and safety at your

plant. DeltaV Inspect is an advanced process-

monitoring system that instantly identifies under-

performing loops.

Benefits

Keeps tabs on the health of process equipment.

Use DeltaV Inspect variability indexes to monitor plant

control performance for all input/output, and control

blocks. Know immediately when the process variability

increases from its normal value, signifying that a

Product Data Sheet

DeltaV Inspect

July 2002—Page 2

measurement or control element may need attention

or a loop may need tuning.

Identifies problem areas. DeltaV Inspect

automatically displays abnormal conditions, so you

can easily identify the problem control or input/output

block. Using the tree structure it is possible browse

abnormal conditions for just a single loop, for a unit or

process area, or for the entire system.

Monitors the pulse of your plant. Plant-wide control

performance and control utilization indices are

calculated automatically. The performance index is a

measure of how close loop performance is to minimum

variance control. The control utilization value is based

on the percentage of time that control loops are in the

correct mode.

Requires no configuration. DeltaV Inspect

automatically recognizes input/output and control

blocks as they are added to or deleted from any

DeltaV controller. Default limits are automatically

provided and can be easily reset either individually or

system wide.

In the case of control blocks, the variability index

calculated by the DeltaV Inspect server indicates how

close loop performance is to minimum variance

control. Based on this measurement of variability,

individual modules that contain blocks with excessive

variability are automatically flagged for display in

DeltaV Inspect.

By selecting a displayed module, you can view the

variability index calculated for each input, output, or

control block in that module. To prevent false

indication caused by short-term changes in

throughput, this detection is based on the average

variability over a selected timeframe: hour, shift or day.

DeltaV Inspect uses a total standard deviation and

capability standard deviation, calculated in the DeltaV

input/output and Control Function Blocks, to calculate

a variability index. This indicates the possible

improvement for control blocks as compared to

minimum variance control.

Product Description and Specification

To allow process variability to be accurately assessed

by DeltaV Inspect, total standard deviation (S tot ) and

capability standard deviation (S cap ) are automatically

calculated by each input, output and control function

block in the DeltaV controller. The value determined

after 100 executions of each block is communicated

from the controller to the DeltaV Inspect server in the

DeltaV ProfessionalPLUS Station. This information is

automatically used to calculate a variability index for

each block. Block status-and-mode information is

reported to the server using exception reporting, i.e.

reporting when the value changes. The server uses

these mode and status values to detect any abnormal

conditions associated with the block operation.

Product Data Sheet

DeltaV Inspect

July 2002—Page 3

Based on block mode and parameter status, DeltaV

Inspect automatically identifies abnormal conditions

and graphically displays them on a DeltaV workstation.

The conditions detected are:

Bad I/O. The block process variable is bad,

uncertain, or limited.

Limited control action. A downstream condition

that limits the control action taken by the block has

developed.

When the DeltaV Inspect capability is enabled on a

controller, all input/output, and control blocks from that

DeltaV controller and connected Emerson Process

Management F OUNDATION fieldbus devices will be

automatically monitored. From the file menu, you can

select individual controllers for monitoring by DeltaV

Inspect.

Mode not normal . The actual mode of the block

does not match the normal mode configured for

the block.

The percentage of time that these conditions exist over

an hour, shift, or day is computed for each block and

compared to a configured global limit for each

condition. When one of these limits is exceeded, a

graphical module summary is generated, which

includes the associated module, as shown in the graph

on page 3.

DeltaV Inspect automatically configures itself as

control strategies are added to or deleted from the

system. No communications interface or mapping of

tags is required for DeltaV Inspect to run, which means

no extra engineering work for you.

Although DeltaV Inspect provides default limits for the

variability index and for system incorrect mode, limited

and bad percent time, you can change these default

values based on your specific knowledge of your

process.

If you have a non-continuous process or are subject to

intermittent out of service periods DeltaV Inspect

calculations can even be configured to stop and start

programmatically based on the state of your process.

Using the Inspect function block it’s possible to make

inspect disable calculations for a specific area based

on the running state of the process.

The modules included in this summary are also

individually listed. By selecting one of these modules,

you get a detailed view of the input/output, or control

blocks in the modules that are malfunctioning. You can

also view the calculated variability and percentage of

time an abnormal condition existed.

From this detail display, you may change time

percentage and variability limits.

The Inspect block also allows you to historically trend

and even alarm on the performance or utilization

parameters for a given process area or the entire

system.

Product Data Sheet

DeltaV Inspect

July 2002—Page 4

Ordering Information

Description

Model Number

DeltaV Inspect

Standard functionality included in every DeltaV

system, and installed on every DeltaV workstation.

Prerequisites

The DeltaV Inspect client application can be run from any DeltaV workstation.

To locate a sales office near you, visit our website at:

www.EasyDeltaV.com/reach

…or call us at: Asia Pacific: 65.777.8211

Europe, Middle East: 41.41.768.6111

North America, Latin America: +1 800.833.8314 or

+1 512.832.3774

For large power, water, and wastewater applications contact Power and Water Solutions at:

www.emersonprocess-powerwater.com

…or call us at: Asia Pacific: 65.777.8211

Europe, Middle East, Africa: 48.22.630.2443

North America, Latin America: +1 412.963.4000

DeltaV, the DeltaV design, SureService, the SureService design, SureNet, the SureNet design, and PlantWeb are marks of one of the Emerson

Process Management group of companies. All other marks are property of their respective owners. The contents of this publication are presented for

informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warrantees or guarantees,

express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by our terms and conditions,

which are available on request. We reserve the right to modify or improve the design or specification of such products at any time without notice.

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