Allen-Bradley 1794-OF4I Flex I/O Isolated Analog Output Module
Product Overview
The 1794-OF4I is a Flex I/O isolated analog output module from Allen-Bradley, part of the Rockwell Automation portfolio. It delivers four isolated output channels supporting current (4-20 mA, 0-20 mA) and voltage (±10V, 0-10V, ±5V, 0-5V) signals. This module offers high resolution (15 bits + sign) and rapid update rates (2.5/5.0 ms). Designed for demanding industrial environments, it features robust isolation, wide temperature tolerance, and flexible mounting. The 1794-OF4I ensures reliable signal conversion for precise control applications.
Key Technical Specifications
| Brand | Allen-Bradley / Rockwell Automation |
| Model | 1794-OF4I |
| Series | Flex I/O |
| Outputs | 4 isolated analog outputs |
| Output Types | 4-20 mA, 0-20 mA, ±10V, 0-10V, ±5V, 0-5V (user-configurable) |
| Resolution | 15 bits + sign (Voltage: 0.320 mV/cnt; Current: 0.656 µA/cnt) |
| Update Rate | 2.5 ms or 5.0 ms (all channels) |
| Step Response (63%) | < 25 µs |
| Accuracy (25°C) | ±0.1% full scale (voltage & current) |
| Accuracy Drift | Voltage: 0.0012% FS/°C; Current: 0.0025% FS/°C |
| Isolation Voltage | 120V continuous (250V with 1794-TBN base) |
| External DC Supply | 19.2…31.2V DC (nominal 24V DC) |
| FlexBus Current | 50 mA @ 5V DC |
| Current Load (Voltage Out) | 3 mA max. |
| Resistive Load (Voltage) | 0 to 750 Ω |
| Overload Protection | 30V or 32 mA continuous (1 channel at a time) |
| Thermal Dissipation | 16 BTU/hr @ 31.2V DC max. |
| Operating Temp. | 0 to 55 °C (32 to 131 °F) |
| Storage Temp. | –40 to 85 °C (–40 to 185 °F) |
| Vibration | 5g @ 10-500 Hz |
| Shock | 30 g |
| Mounting | DIN rail or panel mount |
Installation & Compatibility
Mount the 1794-OF4I on a standard DIN rail or directly to an enclosure sub-panel. It works with any Flex I/O communication adapter. Compatible terminal bases: 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN. The module draws 50 mA from the FlexBus and requires an external 24V DC supply (range 19.2-31.2V DC). All connections are made via the terminal base.
Diagnostics & Configuration
This module features factory calibration with optional manual calibration. Outputs remain at 0 until configuration is complete. Diagnostic indicators assist in troubleshooting. Configuration is user-selectable per channel for current or voltage ranges. The module provides robust isolation and overload protection for reliable operation.
Typical Applications
Ideal for process control, actuator control, valve positioning, and signal conversion in PLC and DCS systems. Suitable for automotive, pharmaceutical, food & beverage, and water treatment industries. The 1794-OF4I ensures precise analog output in demanding automation environments. Also compatible with Modicon Quantum systems via appropriate adapters.
Certifications & Environmental
- Approved for use in hazardous locations
- Open enclosure rating
- RoHS compliant
- CE marked
- UL listed
Why Buy From Oiltech Controls?
- 15+ years of industrial automation parts expertise
- Global shipping support with FedEx, UPS, DHL
- Tested industrial surplus and refurbished options
- 12-month warranty on all products
- Technical verification prior to shipment
- Support for obsolete control systems
Frequently Asked Questions (FAQ)
- Q: Can I use this module with a 1794-TB3 base?
A: Yes, it is compatible with 1794-TB2, TB3, TB3S, TB3T, TB3TS, and TBN bases. - Q: What is the update rate?
A: The update rate is configurable to 2.5 ms or 5.0 ms for all channels. - Q: Does it support both voltage and current outputs?
A: Yes, each channel is individually configurable for voltage or current ranges. - Q: Is calibration required?
A: Factory calibrated; optional manual calibration is available. - Q: What is the isolation voltage?
A: 120V continuous (250V with 1794-TBN base).
Packaging & Warranty
Each 1794-OF4I module is packaged securely to prevent damage during transit. The package includes the module and necessary mounting hardware. We provide a 12-month warranty against defects. For any inquiries, please contact us at info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).
Shipping: We ship worldwide via FedEx, UPS, and DHL. Tracking information is provided upon dispatch.
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