Specifications

Publication 1747-SG001E-EN-E - February 2013
Select SLC 500 I/O Modules 21
8-Channel Input Modules
General Input Specifications for 1746-NI8
Specification 1746-NI8
Backplane current (mA) @ 5V 200 mA
Backplane current (mA) @ 24V 100 mA
Backplane power consumption 3.4 W maximum (1.0 W @ 5V DC, 2.4 W @ 24V DC)
Number of inputs 8
Converter resolution 16-bit
Type of input (selectable) ±10V DC
0…5V DC
0…20 mA
±20 mA
1…5V DC
0…10V DC
4…20 mA
0…1 mA
Type of data (selectable) Engineering Units
Scaled for PID
Proportional Counts (-32,768…32,767 range)
Proportional Counts (User-Defined Range, Class 3 only)
1746-NI4 Data Format
A/D conversion method Successive approximation, switched capacitor
Input filter frequencies 1 Hz
2 Hz
5 Hz
10 Hz
20 Hz
50 Hz
75 Hz
Time to detect open circuit 1 module scan
Common mode voltage range ±10.5V (15V maximum between any two input signal terminals
when connected in a single-ended configuration)
Isolation voltage Tested @ 500V AC and 710V DC for 60 s
Module update time 0.75 ms per enabled channel
Channel turn-on time, max 101…107 ms
Channel turn-off time, max 1…7 ms
Channel reconsideration time,
max
101…107 ms
Calibration Module performs continuous autocalibration
Input Step Response for 1746-NI8
Filter
Frequency
Step Response for 1746-NI8
1% Accuracy
(1)
0.1% Accuracy
(1)
0.05% Accuracy
(1)
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