User Manual

Publication 1746-UM003A-EN-P
4-14 Channel Configuration, Data, and Status
The following tables show the resistance ranges provided by the 1746-NR8.
Table 4.9 Data Format for 150Ω
ΩΩ
Ω Resistance Input
Table 4.10 Data Format for 500
Ω
ΩΩ
Ω and 1000 Ω
ΩΩ
Ω Resistance Input
Table 4.11 Data Format for 3000
Ω
ΩΩ
Ω Resistance Input
The following table shows the data resolution provided by the 1746-NR8 for
RTD input types using the various data formats. The table applies to both 0.25
and 1.0 mA excitation currents. The data resolution of the remaining RTDs
vary with excitation current.
Table 4.12 Channel Data Word Resolution for RTDs
Resistance Input Type Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
(Default)
0.01
Ω
(1)
0.1Ω
(1)
150Ω 0 to 15000 0 to 1500 0 to 16383 -32768 to 32767
(1) When ohms are selected, the temperature-units selection (bit 8) is ignored.
Resistance Input Type Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
(Default)
0.1
Ω
(1)
1.0Ω
(1)
500Ω 0 to 5000 0 to 500 0 to 16383 -32768 to 32767
1000
Ω 0 to 10000 0 to 1000 0 to 16383 -32768 to 32767
(1) When ohms are selected, the temperature-units selection (bit 8) is ignored.
Excitation Current Data Format
Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Proportional Counts
(Default)
0.1
Ω
(1)
1.0 Ω
(1)
0.25 mA 0 to 30000 0 to 3000 0 to 16383 -32768 to 32767
1.0 mA 0 to 12000 0 to 1200 0 to 16383 -32768 to 32767
(1) When ohms are selected, the temperature-units selection (bit 8) is ignored.
RTD Input Type
Data Format (Bits 4 and 5)
(1)
Engineering Units x 1 Engineering Units x
10
Scaled-for-PID Proportional Counts
(Default)
°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
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 0.0228°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 0.012 °C/step 0.0228°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 0.005 °C/step 0.0093°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 is 100
Ω per DIN standard.