20 FLEX I/O Isolated Output HART Analog Module
Publication 1794-IN120D-EN-P - September 2015
Specifications
Specifications – FLEX I/O Isolated Output Analog Module – 1794-OF8IH
Attribute Value
Number of outputs 8 single-ended, isolated
Recommended terminal base unit 1794-TB3, 1794-TB3S
Resolution 16-bits – unipolar
Current 0.305 μA/cnt – unipolar
Data format Engineering Units
(3)
Percent of Full Scale
RAW/Proportional Count
Conversion type 16-bits digital to analog converter
Conversion rate 10 ms
Output current terminal 4...20 mA (user configurable)
0...20 mA (user configurable)
0 mA output until product is configured
Settling Time 70 ms, 0...99%
Normal mode rejection ratio – current
terminal
>70 dB @ 50/60 Hz (4.17 Hz ADC conversion rate)
>65 dB @ 50/60 Hz (10.0 Hz ADC conversion rate)
>75 dB @ 50 Hz (16.7 Hz ADC conversion rate)
>85 dB @ 60 Hz (19.6 Hz ADC conversion rate)
Common mode rejection ratio >60 dB @ 50 Hz
>60 dB @ 60 Hz
Load resistance 0...750 Ω standard
Load reactance, max 10 μH
Absolute accuracy
(1)
± 0.1% full scale @ 25 °C
± 0.35% full scale @ 0...55 °C
Accuracy drift with temperature
(1)
± 0.008% / °C
0.0038% full scale / °C
Calibration required Factory calibrated
Maximum overload 30V continuous or 32 mA continuous, one channel at a time
Isolation voltage 120V (continuous), Basic Insulation Type
Type tested @ 1000V AC for 60 s, between User power to
system, channel to system, and channel to channel.
Flexbus current 80 mA @ 5V DC
Power dissipation, max 5.0 W @ 24V DC
Thermal dissipation, max 17.06 BTU/hr @ 24V DC
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