Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario descargar pdf (Pagina 63)

Publication 1746-UM001A-US-P

Channel Configuration, Data, and Status 5-15

1746-NI4 Data Format Units to Real Units

Example: #5 A transducer is being used to measure flow rate.

The -10V dc to +10V dc signal range is proportional to 0 to 100 GPM

The input data is in “1746-NI4” format, i.e. input range of -32768 to 32767

Input value to convert = 10000

The Scaled range is 0 to 100 GPM

The Input range is -32768 to +32767

Find: Input value in GPM

Per the equations above:

User-Defined Scaling Data Format to Real Units

Example: #6 A transducer is being used to measure pressure.

The -10V dc to +10V dc signal range is proportional to 0 to 200 psi

The input data is in “User Defined Format”, where:

The lower input limit (configuration word 8) = 0

The upper input limit (configuration word 9) = 20000

Input value to convert = 16600

Scaled range is 0 to 200 psi

Input range is 0 to 20000

Find: Input value in psi

Per the equation above:

Slope

100 0

–

()

32767 32768

–

()

–

[]

------------------------------------------------------ 0 . 0015==

Offset 0 32768

–

0.0015

×()

49.15=

–=

Scaled Value 10000 0.0015

×()

49.15

64.15 GPM

=+=

Slope

200 0

–

()

20000 0

–

()

--------------------------------0.01==

Offset 0 0 0.01

×()

=–=

Scaled Value 16600 0.01

166 psi

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 119 120

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Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual de usuario Pagina 63

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