Product details
Allen-Bradley 1794-OF8IH HART Analog Output Module — Fast, Isolated, and Easy to Deploy
The 1794-OF8IH delivers eight isolated current outputs with HART, engineered for stable control. It supports 0–20 mA and 4–20 mA ranges with 16-bit resolution and a 10 ms conversion rate. The module belongs to the Flex I/O 1794 series from Rockwell Automation and installs on 1794-TB3 or 1794-TB3S bases.
Technical Specifications
- Brand / Manufacturer: Allen-Bradley / Rockwell Automation.
- Model / Catalog No.: 1794-OF8IH (HART Isolated Analog Output Module).
- Series: Flex I/O 1794; Terminal Bases: 1794-TB3, 1794-TB3S.
- Outputs: 8 isolated single-ended current channels.
- Measurement range: 0–20 mA or 4–20 mA per channel.
- Resolution: 16-bit; actual step size about 0.305 µA per count.
- Conversion method: 16-bit digital-to-analog converter; update time: 10 ms.
- Linearity and stability: isolated outputs reduce ground loops and noise.
- Environmental range: 32–131 °F (0–55 °C) operating.
- Power: FlexBus current 80 mA @ 5 V DC; no external loop power required for module electronics.
- Power dissipation: 5.0 W max @ 24 V DC; Thermal: 17.06 BTU/hr max @ 24 V DC.
- Data handling: Engineering Units, Percent of Full Scale, RAW/Proportional Count.
- Isolation and EMC: per Flex I/O design for robust industrial interference immunity.
- Calibration: Factory calibrated; no field potentiometers required.
Compatibility and Suffix Information
- Catalog Number: 1794-OF8IH (HART Isolated Analog Output, eight channels).
- Terminal Base Options (selection “suffix” at installation): 1794-TB3 or 1794-TB3S.
- System Series: Flex I/O 1794 with FlexBus backplane (80 mA @ 5 V DC).
- Keyswitch position requirement: 4 on the chosen terminal base.
Power and Thermal Characteristics
- FlexBus supply current: 80 mA @ 5 V DC; module electronics draw from backplane.
- Maximum power dissipation: 5.0 W @ 24 V DC input systems.
- Thermal dissipation: 17.06 BTU/hr @ 24 V DC conditions.
Packing List
- 1794-OF8IH HART Isolated Analog Output Module.
- Quick start installation and configuration guide.
- Note: 1794-TB3 or 1794-TB3S terminal base ships separately.
FAQ
- Q: Does 1794-OF8IH support both 0–20 mA and 4–20 mA? A: Yes, select per channel.
- Q: Can I program HART devices through the module? A: Yes, use pass-through messaging.
- Q: Do I need external power for the module? A: The FlexBus supplies the module.
- Q: Which base should I choose? A: Use 1794-TB3 or 1794-TB3S per wiring preference.
- Q: What temperatures does the module handle? A: Operate from 32–131 °F.
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