Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario descargar pdf (Pagina 60)

Publication 1746-UM001A-US-P

5-12 Channel Configuration, Data, and Status

Scaling Examples

The following scaling examples show how to convert the channel

data word from the configured data type to “real” units. Real units are

the values being measured, such as temperature and pressure. To

perform the scaling, you must know the defined voltage or current

range for the channel’s input type. The lowest possible actual value

for an input type is ScaledMin, and the highest possible actual value is

ScaledMax. Refer to the Channel Data Word Value tables on page 5-9

and page 5-10 for the channel word signal ranges.

Formulas

Three formulas are used in all of the following examples. They are:

where:

and

NOTE

In all of the examples on pages 5-13 to 5-15, the zero

offset is the low range limit (InputMin).

Scaled Value Input Value Slope

×()

Offset+

Slope

ScaledMax

ScaledMin

–

()

InputMax InputMin

–

()

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

Offset ScaledMin InputMin Slope

×()

–

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Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario Pagina 60