Rockwell Automation 1746-NI8 SLC 500 Analog Input Modules User Manual - Manual (Page 76)

Appendix
A
Publication 1746Ć6.8 - April 1997
Specifications
This appendix lists the specifications for the 1746-NI8 Analog Input
Module.
Description Specification
Backplane Current Consumption
200 mA at 5V dc
100 mA at 24V dc
Backplane Power Consumption 3.4W maximum (1.0W @ 5V dc, 2.4W @ 24V dc)
Number of Channels 8 (backplane isolated)
I/O Chassis Location Any I/O module slot except slot 0
A/D Conversion Method Successive approximation, switched capacitor
Input Filtering Low pass digital filter with programmable filter frequencies
Normal Mode Rejection
(between [+] input and [Ć] input)
Provided by lowĆpass filter
Common Mode Rejection
(between inputs and chassis ground)
Greater than or equal to 75 dB at DC
Greater than or equal to 100 dB at 50/60 Hz
Input Filter Frequencies
1 Hz
2 Hz
5 Hz
10 Hz
20 Hz
50 Hz
75 Hz
Calibration The module performs continuous autocalibration.
Isolation
50V dc continuous between the analog inputs and the backplane
530V ac and 750V dc pulse withstand for 1 second
CommonĆMode Voltage Range ± 10.5V (21V maximum between any two terminals)
Description Specification
LED Indicators
9 green status indicators
one for each of 8 channels and one for module status
Module ID Code
Class 1 Interface: 3526
Class 3 Interface: 12726
Recommended Cable Belden #8761 or equivalent
Maximum Wire Size Two 14 AWG wires per terminal
Maximum Cable
Impedance
Voltage Source (with less than 10 Ω impedance):
40 Ω maximum loop impedance, for <1LSB error
Current Source (transmitter properly wired to its power supply):
250 Ω maximum loop impedance, to meet commonĆmode voltage requirements
Terminal Block Removable, AllenĆBradley spare part Catalog Number 1746ĆRT25G
Electrical Specifications
Physical Specifications