Appendix
A
Publication 17946.5.2 - May 1996
Specifications
Specifications - 1794IE8/B Analog Input Module
Number of Inputs
8 singleended, nonisolated
Module Location
Cat. No. 1794TB2, TB3 Terminal Base Unit
Resolution
Voltage
Current
12 bits unipolar; 11 bits plus sign bipolar
2.56mV/cnt unipolar; 5.13mV/cnt bipolar
5.13
µ
A/cnt
Data Format
left justified 16bit 2's complement
Conversion Type
Successive approximation
Conversion Rate
256
µ
s all channels
Input Current Terminal
420mA (user configurable)
020mA (user configurable)
Input Voltage Terminal
±
10V (user configurable)
010V (user configurable)
Normal Mode Rejection Ratio
Voltage Terminal
Current Terminal
-3db @ 17Hz; -20db/decade
-10.0dB @ 50Hz, -11.4dB @ 60Hz
-3db @ 9Hz; -20db/decade
-15.3dB @ 50Hz, -16.8dB @ 60Hz
Step Response to 63%
Voltage Terminal
Current Terminal
9.4ms
18.2ms
Input Impedance
Voltage Terminal
Current Terminal
100k ohms
238 ohms
Input Resistance
Voltage Terminal
Current Terminal
200k ohms
238 ohms
Absolute Accuracy
1
Voltage Terminal
Current Terminal
0.29% Full Scale @ 25
o
C
0.29% Full Scale @ 25
o
C
Accuracy Drift with Temperature
Voltage Terminal
Current Terminal
0.00428% Full Scale/
o
C
0.00407% Full Scale/
o
C
Calibration
None Required
Maximum Overload
30V continuous or 32mA continuous,
one channel at a time
Isolation Voltage
Tested at 850V dc for 1s between user and system
No isolation between individual channels
Indicators
1 green power indicator
Flexbus Current
20mA
Power Dissipation
3W maximum @ 31.2V dc
Thermal Dissipation
Maximum 10.2 BTU/hr @ 31.2V dc
Keyswitch Position
3
Specifications continued on next page.