8.8.13 Application information
The configuration of the AI function block and its associated output channels
depends on the specific application. A typical configuration for the AI block
involves the following parameters:
Channel
If the device supports more than one measurement, verify that the selected
channel contains the appropriate measurement or derived value.
L_TYPE
Select Direct when the measurement is already in the engineering units that you
want for the block output.
Select Indirect when you want to convert the measured variable into another, for
example, pressure into level or flow into energy.
Select Indirect Square Root when the block I/O parameter value represents a flow
measurement made using differential pressure and when square root extraction
is not performed by the transducer.
Scaling
XD_SCALE provides the range and units of the measurement, and OUT_SCALE
provides the range and engineering units of the output.
8.8.14
Application examples
Temperature transmitter - situation
A temperature transmitter with a range of -328 to 842 °F (-200 to 450 °C).
Temperature transmitter - solution
Table 8-21 lists the appropriate configuration settings, and Figure 8-7 illustrates
the correct function block configuration.
Table 8-21: Analog Input Function Block Configuration for a Typical
Temperature Transmitter
Parameter Configured values
L_TYPE Direct
XD_SCALE Not used
OUT_SCALE Not used
Manual FOUNDATION
™
Fieldbus
00809-0500-4880 December 2022
Rosemount OCX8800A 159
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