Black Box IC108A Guia do Utilizador descarregar pdf (Página 87)

Advant

Smart Device (HART

) Interface User’s Guide

Section 3.4.4 FCM Input Templet

3BUR 001 085R0001 REV A 3-33

Analog Input FCM Templet Planning

This description, which supplements general information on parameters of the analog input

FCM contained in the Configurable Control Functions (CCF) instruction book, includes

considerations for processing of the input variable from a smart device in the FCM, and

conditioning of the variable in the smart device. Figure 3-14 is an example of an Analog Input

Templet.

The term counts is used to label the value at the analog channel table in the smart device

interface of the Advant OCS System. The counts value is always in 16-bit integer format.

From the channel you specify in the CHANNEL NUMBER field of the templet, the current

value (counts) is accessed and converted by CCF to a result in engineering units. This is done

with a proportion defined by using your entries in the COUNTS—LOWER BOUND,

COUNTS—UPPER BOUND, ENGU—LOWER BOUND, and ENGU—UPPER BOUND

fields. The equation used is:

where:

Figure 3-14. Analog Input Templet

EU is the result of the FCM in engineering units

C is the counts from the specified channel

CLC–

()

HU LU–

()

(

)

–

-------------------------------------------------- LU+=

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 117 118

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Black Box IC108A Guia do Utilizador Página 87