Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 74)

Publication 1746-UM008B-EN-P - December 2006
74 Channel Configuration, Data, and Status
The Channel Data Word Resolution for RTDs table shows the data
resolution provided by the 1746-NR4 for RTD input types using the
various data formats.
The Channel Data Word Resolution for 150
Ω Resistance Input table
and the Channel Data Word Resolution for 500
Ω, 1000 Ω, and 3000
Ω Resistance Inputs table shows the data resolution provided by the
1746-NR4 for resistance input types using the various data formats.
Channel Data Word Resolution for RTDs
RTD Input Type
Data Format (Bits 4 and 5)
(1)
Engineering Units x 1
Engineering Units
x 10
Scaled-for-PID
Proportional Counts
(Defaults)
°C °F °C °F °C °F °C °F
100
Ω Platinum 385
0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0641 °C/step 0.1154 °F/step 0.0160 °C/step 0.0288 °F/step
200 Ω Platinum 385 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0641 °C/step 0.1154 °F/step 0.0160 °C/step 0.0288 °F/step
500
Ω Platinum 385
0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0641 °C/step 0.1154 °F/step 0.0160 °C/step 0.0288 °F/step
1000 Ω Platinum 385 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0641 °C/step 0.1154 °F/step 0.0160 °C/step 0.0288 °F/step
100
Ω Platinum 3916 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0507 °C/step 0.0912 °F/step 0.0127 °C/step 0.0288 °F/step
200 Ω Platinum 3916 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0507 °C/step 0.0912 °F/step 0.0127 °C/step 0.0288 °F/step
500
Ω Platinum 3916 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0507 °C/step 0.0912 °F/step 0.0127 °C/step 0.0288 °F/step
1000 Ω Platinum 3916 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0507 °C/step 0.0912 °F/step 0.0127 °C/step 0.0288 °F/step
10
Ω Copper 426
0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0220 °C/step 0.0396 °F/step 0.0051 °C/step 0.0099 °F/step
120 Ω Nickel 618 (2) 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0220 °C/step 0.0396 °F/step 0.0051 °C/step 0.0099 °F/step
120
Ω Nickel 672
0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0208 °C/step 0.0374 °F/step 0.0052 °C/step 0.0093 °F/step
604 Ω Nickel Iron 518 0.1 °C/step 0.1 °F/step 1 °C/step 1 °F/step 0.0183 °C/step 0.0330 °F/step 0.0046 °C/step 0.0082 °F/step
(1)
When ohms are selected, the temperature-units selection (bit 8) is ignored. Analog input data is the same for either °C or °F selection.
(2) Actual value at 0 °C (32 °F) is 100 Ω per DIN standard.
Channel Data Word Resolution for 150
Ω Resistance Input
Resistance Input Type
Data Format (Bits 4 and 5)
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID
Proportional Counts
(Defaults)
Ohms Ohms Ohms Ohms
150
Ω
0.01
Ω / step
0.1
Ω / step
0.0092
Ω / step
0.0023
Ω / step