Black Box IC108A Guia do Utilizador descarregar pdf (Página 89)

Advant

Smart Device (HART

) Interface User’s Guide

Section 3.4.4 FCM Input Templet

3BUR 001 085R0001 REV A 3-35

With this configuration, when the current count is 451, the equation and result become:

Example 2

To obtain a result expressed to the tenths digit:

A particular variable in the smart device can range from 0.0 to 100.0, with the value rounded to

the nearest tenth; for example, 54.3 is a possible value. This value is to be conditioned, stored in,

and read from the smart device. The current value read is to be sent to channel 36 in the analog

channel table of the smart device interface. To use this value as the input for a continuous loop

in the Advant OCS System, you can proceed as follows when configuring the smart device, and

the analog input FCM for the related loop.

In the smart device—Multiply the variable by 10 and store it, as an integer variable that has a

range of 0 to 1000, in a portion of smart device memory from which it will be read when

appropriate command(s) are received during scans by the interface.

In the Advant OCS System—Use the SMARTNET templet, as described in Section 3.3.5.4,

SMARTNET Object, to arrange for the conditioned value in the smart device to be sent to a

channel (number 36 in this example) in the analog channel table of the interface.

For the Related Loop in the Advant OCS Data Base—Include the following entries to the

Analog Input Templet to achieve an analog input FCM result equal to the original value of the

variable in the smart device:

With this configuration, if the current value is 54.3, and the conditioned value, 543, is sent from

the smart device to channel 36, the equation and result become:

Field of Templet Entry

CHANNEL NUMBER 36

COUNTS—LOWER BOUND 0

COUNTS—UPPER BOUND 1000

ENGU—LOWER BOUND 0.0

ENGU—UPPER BOUND 100.0

451 0–

()

1000 0–

()

1000 0–

()

-------------------------------------------------0+=

EU 451=

543 0–

()

100.0 0.0–

()

1000 0–

()

-------------------------------------------------------0.0+=

543

()

100.0

()

1000

--------------------------------=

EU 54.3=

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 117 118

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