Emerson 3051S Especificaciones descargar pdf (Pagina 92)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

6-14

EDDL Trending of Mean

and Standard Deviation

Once the SPM has been enabled, the EDDL user interface allows for easy

viewing and trending of mean and standard deviation. To open up the trending

screen, go to

Service Tools > Trends > SPM and click the desired “Process Monitor #”

button

The EDDL Screen will show an on-line trend of mean and standard deviation,

along with the baseline values, percent change, and detection limits

(Figure 6-11).

Figure 6-11. EDDL Trend of

Mean and Standard Deviation

Note that data shown on the EDDL trends are not stored in a process

historian or other database. When this screen is closed, all of the past data in

the trends plots are lost. See “Trending SPM Data in DeltaV” on page 6-14 for

configuring SPM data to be stored in a historian.

Trending SPM Data in

DeltaV

Refer to “Trending Statistical Values in Control System” on page 6-10 for

general information about accessing the SPM data through the AI and MAI

function blocks. This section shows a specific example of how SPM Data can

be accessed within the DeltaV host system, saved into the process historian,

and used to generate a process alert.

In DeltaV Control Studio, add an AI function block, and assign it to one of the

AI function blocks in the 3051S Device. Set the CHANNEL to one of the valid

SPM channel values from Table 6-1 on page 6-11. For example, set the

CHANNEL to 13 for SPM1 Standard Deviation, as shown in Figure 6-12.

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Emerson 3051S Especificaciones Pagina 92