Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 117)

117 Publication 1746-UM008B-EN-P - December 2006
Appendix
A
Specifications
This appendix lists the specifications for the 1746-NR4 RTD Input
Module.
1746-NR4 Electrical Specifications
Backplane current consumption 50 mA at 5V dc
50 mA at 24V dc
Backplane power consumption 1.5 W max (0.3 W at 5V dc, 1.2 W at
24V dc)
External power supply requirements None
Number of channels 4 (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) > 150 dB at 50 Hz (10 Hz and 50 Hz filter
frequencies)
> 150 dB at 60 Hz (10 Hz and 60 Hz filter
frequencies)
Normal mode rejection (between [+] input
and [-] input) > 100 dB at 50 Hz (10 Hz, 50 Hz filter
frequencies)
> 100 dB at 60 Hz (10 Hz, 60 Hz filter
frequencies)
Max common mode voltage ±1 volt
Max allowed permanent overload Volts = ±5V dc
Current= ±5 mA
Input filter cut-off frequencies 2.62 Hz at 10 Hz filter frequency
13.1 Hz at 50 Hz filter frequency
15.72 Hz at 60 Hz filter frequency
65.5 Hz at 250 Hz filter frequency
Calibration Module auto calibrates when a channel is
enabled or when a change is made to its
input type, filter frequency or excitation
current.
Isolation (optical) 500V dc for 1 min between inputs and
chassis ground, and between inputs and
backplane
Isolation between inputs None