Rockwell Automation 1746-NR8 SLC 500 RTD/Resistance Input Module User Manual - Manual (Page 101)

1 Publication 1746-UM003A-EN-P
Appendix
A
Specifications
This appendix lists the specifications for the 1746-NR8 RTD Input Module.
Electrical Specifications
Physical Specifications
Backplane Current Consumption 100 mA at 5V dc
55 mA at 24V dc
Backplane Power Consumption 1.82W maximum (0.5W at 5V dc, 1.32W at 24V dc)
External Power Supply Requirements None
Number of Channels 8 (backplane isolated)
I/O Chassis Location Any I/O module slot except slot 0
A/D Conversion Method Sigma-Delta Modulation
Input Filtering Low pass digital filter with programmable notch
(filter) frequencies
Common Mode Rejection
(between inputs and chassis ground) > 120 dB at 50 Hz (28 Hz and 50 Hz filter frequencies)
> 120 dB at 60 Hz (28 Hz and 60 Hz filter frequencies)
Normal Mode Rejection
(between [+] input and [-] input) 65 dB minimum at 50/60 Hz with 50/60 Hz filter
110 dB minimum at 50 Hz with 28 Hz filter
95 dB minimum at 60 Hz with 28 Hz filter
Max. common mode voltage ± 1 volt
Max. allowed permanent overload
(1)
(1) Do not apply a voltage or current to the module.
Volts = ± 5V dc; Current = ± 5 mA
Input Filter Cut-Off Frequencies 7.80 Hz at 28 Hz filter frequency
13.65 Hz at 50/60 Hz filter frequency
209.6 Hz at 800 Hz filter frequency
1676 Hz at 6400 Hz filter frequency
Calibration Module autocalibrates when:
•
power is provided to the module
•
a channel is enabled
•
a change is made to its input type, filter
frequency or excitation current
•
the periodic calibration disable is set to 0
Isolation (optical) 500V ac for 1 minute between inputs and chassis
ground, and between inputs and backplane
Isolation Between Inputs ±5 V dc
LED Indicators 9 green status indicators, one for each of 8 channels and one
for module status
Module ID Code 3508 - Class 1
12708 - Class 3
Maximum Termination Wire
Size One 14 AWG wire per terminal
Maximum Cable Impedance 25 ohms maximum impedance for 3-wire RTD configuration
Terminal Block 1746-RT35