Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Manual do Utilizador descarregar pdf (Página 51)

5–10

Channel Configuration, Data, and Status

Publication

17466.8 - April 1997

1746-NI4 Data Format Units to “Real” Units

Situation: A transducer is being used to measure flow rate.

The –10V dc to +10V dc signal is proportional to 0–100 GPM.

The channel data word is in 1746-NI4 data format.

The channel data = 10000.

Find:

“Real” units equivalent in GPM.

Equation: Real Units Equivalentchannel data value



HIGH

S

LOW

input range



where: S

LOW

= 0 GPM

HIGH

= 100 GPM

channel data word = 5500

NI4 full scale default value (from table on page 5–6) = 65535

Solution: Real Units Equivalent10000



100 GPM0 GPM

65535



15.26 GPM

User Defined Limits Data Format to “Real” Units

Situation: A

transducer is being used to measure pressure.

The –10V dc to +10V dc signal is proportional to 0–200 psi.

The channel data word is in user defined data format.

The lower scale limit (configuration word 8) = 0.

The upper scale limit (configuration word 9) = 20000.

The channel data word = 16600.

Find:

“Real” units equivalent in psi.

Equation: Real Units Equivalentchannel data word



(

HIGH

S

LOW

)



upper scale limitlower scale limit





where: S

LOW

= 0 psi

HIGH

= 200 psi

Solution: Real Units Equivalent16600





200 psi0 psi



(

200000

)



166.00 psi

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