Specifications
Publication 1794-SG002D-EN-P - May 2012
Select FLEX I/O Modules 53
1794-OE8H HART Enabled Analog 8 Output Module
The 1794-OE8H is a HART enabled analog output module that works with
HART enabled field devices that use current in the 0 to 20 mA range. Use with
2 wire devices. This module provides wire-off detection on a per-channel basis.
This module can be used on ControlNet, EtherNet/IP or PROFIBUS DP
networks. One HART field device per channel.
Accuracy drift w/temp Current input: 0.0069% Full Scale /°C
Voltage input: 0.0045% Full Scale/°C
Calibration None required
Isolation voltage 50 (continuous), I/O to system
Type tested at 850V DC for 1 s, I/O to system
Type tested at 850V DC for 60 s (for 1794-OE4XT only)
No isolation between individual channels
Power dissipation, max 4.5 W @ 31.2V DC
Thermal dissipation,
max
15.3 BTU/hr @ 31.2V DC 13.6 BTU/hr @ 31.2V DC
Wire size 0.34... 2.5 mm
2
(22...12 AWG) solid or stranded shielded copper wire
rated at 75 °C (167 °F) or greater 1.2 mm (3/64 in.) insulation max
Wire category 2 – on signal ports
2 – on power ports
(2)
2 - on signal ports
Dimensions (HxWxD),
approx
46 x 94 x 53 mm (1.8 x 3.7 x 3.1 in.)
94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.) installed
Temperature, operating 0…55 °C (32…131 °F) -20…70 °C (-4…185 °F)
(1) Includes offset, gain, non-linearity, and repeatability error terms
(2) Use this Conductor Category information for planning conductor routing. Refer to Industrial Automation Wiring
and Grounding Guidelines, publication 1770-4.1
.
HART Enabled Analog 8 Output Module
Specification 1794-OE8H
Output resolution 13 bit
Data format Configurable
Output conversion type —
Output conversion rate 10 ms for all channels
Step response to 99% of FS,
output
13 ms to 99% of FS
115 ms during HART communication
Current load on voltage output,
max
0…22 mA @ > 15V
Output current, resistive load 0…680 Ω @ 22 mA
0…770 Ω @ 20 mA
Accuracy 0.1% Full Scale @ 20 °C (68 °F)
Accuracy drift with temperature 0.010% Full Scale @ 20 °C (68 °F)
Analog 4 Input Modules
Specification 1794-OE4 1794-OE4XT