Specifications

Publication 1794-SG002D-EN-P - May 2012
56 Select FLEX I/O Modules
1794-OF8IH HART Isolated Analog 8 Output Module
The 1794-OF8IH modules provides 8 HART enabled isolated outputs for 2-, 3-,
and 4-wire output devices that use voltage in the range of ±10V or 0…20 mA
current.
Power dissipation, max 4.7 W @ 31.2V DC
Thermal dissipation, max 16 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
3 – on power ports
(2)
Dimensions (HxWxD), approx 1794-OF4I:
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
1794-OF4IXT:
46 x 94 x 75 mm (1.8 x 3.7 x 2.95 in.)
94 x 94 x 91 mm (3.7 x 3.7 x 3.6 in.) installed
Temperature, operating 1794-OF4I: 0…55 °C (32…131 °F)
1794-OF4IXT: -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 Isolated Analog 8 Output Module
Specification 1794-OF8IH
Output resolution 16 bits – unipolar
0.305 μA/cnt unipolar
Data format Engineering units
Percent of Full Scale
RAW/proportional count
Output conversion type 16 Bit Digital to Analog Converter
Output conversion rate 10 ms
Step response to 63% of FS,
output
< 70 ms
Output current, resistive load 0…750 Ω
Accuracy ± 0.1% Full Scale at 25 °C
± 0.35% Full Scale at 0…55 °C
Accuracy drift w/temp ± 0.008% /ºC
0.0038 Full Scale /°C
Calibration Factory calibrated
Isolation voltage 120V (continuous), Basic Insulation Type
Type tested at 1000V AC for 60 s, between user power to
system, channel to system, and channel to channel
Power dissipation, max 5.0 W @ 31.2V DC
Isolated Analog 4 Output Module
Specification 1794-OF4I, 1794-OF4IXT