18
Publication 1747-SG001D-EN-P — January 2009
8-Channel Input Modules
Cat. No.
Backplane Current (mA) at 5V
Backplane Current (mA) at 24V
Backplane Power Consumption
Number of Inputs
Converter Resolution
Type of Input (Selectable)
Type of Data (Selectable)
A/D Conversion Method
Input Filter Frequencies
Time to Detect Open Circuit
Common-Mode Voltage Range
Isolation Voltage
Module Update Time
Channel Turn-On Time
Channel Turn-Off Time
Channel Reconsideration Time
Calibration
General Input Specifications for 1746-NI8
1746-NI8
200 mA
100 mA
3.4 W maximum (1.0 W at 5V dc, 2.4 W at 24V dc)
8
16-bit
±10V dc
0…5V dc
0…20 mA
±20 mA
1…5V dc
0…10V dc
4…20 mA
0…1 mA
Engineering Units
Scaled for PID
Proportional Counts (-32,768…32,767 range)
Proportional Counts (User-Defined Range, Class 3 only)
1746-NI4 Data Format
Successive approximation, switched capacitor
1 Hz
2 Hz
5 Hz
10 Hz
20 Hz
50 Hz
75 Hz
1 module scan
±10.5V (15V maximum between any two input signal terminals when connected in a single-ended configuration)
Tested at 500V ac and 710V dc for 60 seconds
0.75 ms per enabled channel
101…107 ms maximum
1…7 ms maximum
101…107 ms maximum
module performs continuous autocalibration
Input Step Response for 1746-NI8
Filter
Frequency
Step Response for 1746-NI8
1% Accuracy
✶
0.1% Accuracy
✶
0.05% Accuracy
✶
1 Hz
730 ms + module update time
1100 ms + module update time
1200 ms + module update time
2 Hz
365 ms + module update time
550 ms + module update time
600 ms + module update time
5 Hz
146 ms + module update time
220 ms + module update time
240 ms + module update time
10 Hz
73 ms + module update time
110 ms + module update time
120 ms + module update time
20 Hz
36.5 ms + module update time
55 ms + module update time
60 ms + module update time
50 Hz
14.5 ms + module update time
22 ms + module update time
24 ms + module update time
75 Hz
10 ms + module update time
15 ms + module update time
18 ms + module update time
no filter
0.5 ms + module update time
0.75 ms + module update time
0.75 ms + module update time
✶
The module accuracy for current inputs is 0.05%, and for voltage inputs is 0.1%.
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