Allen Bradley 1794-OF4I FLEX I/O Isolated Output Analog Module

Allen-Bradley 1794-OF4I FLEX I/O High Output Analog Module

General Information

• Manufacturer: Rockwell Automation

• Brand: Allen-Bradley

• Part Number / Catalog No.: 1794-OF4I

• Product Type: FLEX I/O Isolated Output Analog Module

• Module Type: Isolated Analog Output

• Number of Outputs: 4 Isolated

• Conversion Type: Digital to Analog Converter

• Resolution: 15 bits + sign

• Voltage Resolution: 0.320 mV/cnt

• Step Response to 63% of Full Scale: < 25 µs

• FlexBus Current: 50 mA

• External DC Supply, Nominal: 24 V DC

• Current Load on Voltage Output: 3 mA max

• Output Current Terminal: 4–20 mA

• Output Voltage Terminal: ±10 V

• Thermal Dissipation: 16 BTU/hr @ 31.2 V DC max

• Update Rate: 2.5 / 5.0 ms all channels

• Operating Temperature: 0–55 °C (32–131 °F)

• Vibration: 5g @ 10–500 Hz

• Operating Shock: 30 g

• Mounting: DIN Rail

• UPC: 10612598171580

• Physical Dimensions: 3.7 × 2.6 × 3.7 in (94 × 66 × 94 mm)

• Weight: 0.62 lbs (0.28 kg)

Module Overview
The 1794-OF4I is a FLEX I/O analog output module with four isolated channels designed for precise digital-to-analog conversion. It supports both current and voltage outputs that are fully configurable: 4–20 mA, 0–20 mA, ±10 V, ±5 V, 0–10 V, and 0–5 V. The module provides high-resolution performance with 15-bit + sign accuracy, a fast step response (<25 µs), and update rates of 2.5 or 5 ms for all channels.

Power and Isolation
The module operates with an external DC supply of 19.2–31.2 V DC and draws 50 mA from the FlexBus. Maximum continuous voltage output load is 3 mA, and isolation voltage is 120 V continuous (or 250 V when used with the 1794-TBN base). Thermal dissipation is rated at 16 BTU/hr at 31.2 V DC.

Performance and Accuracy
Both voltage and current terminals have an absolute accuracy of 0.1% full scale at 25 °C. Temperature drift is 0.0012%/°C for voltage and 0.0025%/°C for current. The module ensures reliable performance under vibration (5g) and shock (30 g) conditions.

Description
The 1794-OF4I is compatible with multiple terminal bases (1794-TB2, 1794-TB3 series, 1794-TBN) and can be mounted on DIN rail or panel. Its four isolated outputs provide flexible control of analog devices, including transducers and actuators, in industrial automation systems. Its high-speed update rate, precise conversion, and robust construction make it ideal for demanding control applications requiring reliable analog output.