Specifications

Publication 1794-SG002D-EN-P - May 2012
38 Select FLEX I/O Modules
1794-IE8 and 1794-IE8XT Analog 8 Input Module
The 1794-IE8 is a voltage/current measurement module that works with a
variety of input sensors to measure input voltage in ±10V range or input current
in the 0…20 mA range. Each channel is individually configurable for the desired
input range. Use the 1794-IE8 with 2-, 3-, and 4-wire input sensor field devices.
The 1794-IE8XT module is the extended temperature version of the
1794-IE8 module. The module is conformal coated.
IMPORTANT
Only connect either a voltage input or a current input per channel,
not both.
Use caution to prevent ground loops when using a common ground, since the
channels are not isolated.
Analog 8 Input Modules
Specification 1794-IE8 and 1794-IE8XT
Voltage, input, max overload 30V, single channel, continuous
Current, input, max overload 32 mA, single channel, continuous
Input impedance, nom Current Input: 238 Ω
Voltage Input: 100 kΩ
Input resolution 12 bits – unipolar
11 bits + sign – bipolar
5.13 μA/cnt
2.56 mV/cnt – unipolar
5.13 mV/cnt – bipolar
Data format 16-bit 2’s complement, left-justified
Input conversion type Successive approximation
Input conversion rate 256 μs all channels
Normal mode rejection ratio Current input:
-3 dB @ 9 Hz; -20 dB/decade
-15.3 dB @ 50 Hz
-16.8 dB @ 60 Hz
Voltage input:
-3 dB @ 17 Hz; -20 dB/decade
-10 dB @ 50 Hz
-11.4 dB @ 60 Hz
Calibration None required
Step response to 63% of FS,
input
Current input: 18.2 ms
Voltage input: 9.4 ms
Dimensions (HxWxD), approx 46 x 94 x 53 mm (1.8 x 3.7 x 2.1 in.)
94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.) installed
Accuracy Current input: 0.20% Full Scale @ 25 °C (77 °F)
Voltage input: 0.20% Full Scale @ 25 °C (77 °F)
(1)
(1) Includes offset, gain, non-linearity, and repeatability error terms
Temperature, operating 1794-IEI8: 0…55 °C (32…131 °F)
1794-IE8XT: -20…70 °C (-4…185 °F)