Emerson 3051S Dokumentacja Pobierz pdf (Strona 89)

Reference Manual

00809-0200-4801, Rev CA

July 2010

6-11

Rosemount 3051S

See Table 3-1 for a complete listing of valid Channels for the AI Block.

The SPM Mean and Standard Deviation are always displayed in the unit

inches of water, regardless of the measurement unit configured in the

transducer block for the primary pressure measurement. Therefore, when

configuring an AI Block to read one of the SPM values, the engineering unit of

the XD_SCALE parameter must be set to “inH2O at 68 ºF”.

The OUT_SCALE parameter should be set to the engineering unit and range

which are desired for the mean and standard deviation output. For example, it

is possible to use the OUT_SCALE parameter to convert mean and standard

deviation to some other pressure unit. See “Analog Input (AI) Function Block”

on page 3-8 for additional details on setting the XD_SCALE, OUT_SCALE,

and L_TYPE parameters of the AI function block.

The Multiple Analog Input (MAI) function block can be used to read the mean

and standard deviation from all four SPM blocks simultaneously. The Channel

of the MAI block must be set to 11. The mapping between output parameters

of the MAI and the SPM values is shown in Table 6-2:

The output values from the MAI block are always in the unit inH

SPM Configuration with

EDDL

For host systems that support Electronic Device Description Language

(EDDL), using SPM is made easier with step-by-step configuration guidance

and graphical displays. This section of the manual uses AMS Device Manager

version 10.5 for illustrations, although other EDDL hosts could be used as

well.

The SPM Configuration Wizard can be launched by clicking the button

“Statistical Process Monitor Setup” from the page Configure > Guided Setup

This Wizard will take you step-by-step through the parameters that need to be

set in order to configure SPM. On the first screen (Figure 6-7), select which

SPM block (1, 2, 3, or 4) that you want to configure.

Table 6-1. Valid SPM Channels for the AI Block

Channel

SPM Variable

12 SPM1 mean

13 SPM1 standard deviation

14 SPM2 mean

15 SPM2 standard deviation

16 SPM3 mean

17 SPM3 standard deviation

18 SPM4 mean

19 SPM4 standard deviation

Table 6-2. SPM Output Values for the MAI Block

Parameter SPM Variable

OUT1 SPM1 mean

OUT2 SPM1 standard deviation

OUT3 SPM2 mean

OUT4 SPM2 standard deviation

OUT5 SPM3 mean

OUT6 SPM3 standard deviation

OUT7 SPM4 mean

OUT8 SPM4 standard deviation

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 239 240

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