1794-OF4I | Allen-Bradley Flex I/O 4-Point Isolated Analog Output Module

Overview

The Allen-Bradley 1794-OF4I is a high-precision isolated analog output module for the Flex I/O 1794 series. It provides four independently isolated output channels capable of driving voltage and current signals, making it suitable for process control and instrumentation applications requiring fast, accurate analog control.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model Number: 1794-OF4I

• Product Type: Flex I/O Analog Output Module

• Series: Flex I/O 1794

• Module Type: 4-Point Isolated Analog Output

• Number of Outputs: 4 isolated channels

• Output Signal Types:

• 4–20 mA, 0–20 mA

• ±10 VDC, 0–10 VDC

• ±5 VDC, 0–5 VDC

• Voltage Resolution: 0.320 mV/count

• Current Resolution: 0.656 mA/count

• Update Rate: 2.5 / 5.0 ms for all channels

• Step Response (63% full scale): < 25 μs

• External DC Supply (Nominal): 24 V DC

• External DC Supply Range: 19.2–31.2 V DC (with up to 5% AC ripple)

• Mounting: DIN Rail

• Terminal Base Compatibility: 1794-TB2, TB3, TB3S, TB3T, TB3TS, TBN

• FlexBus Current: 50 mA

• Isolation Voltage: 120 V continuous

• Output Current: 4–20 mA

• Output Voltage: ±10 VDC

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

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

• Storage Temperature: –40–85 °C (–40–185 °F)

• Vibration: 5 g @ 10–500 Hz

• Operating Shock: 30 g

• Weight: 4.00 lbs (1.81 kg)

Key Features

• Four isolated analog outputs allow simultaneous multi-channel control

• Supports both current and voltage output ranges for versatile applications

• High-resolution 15-bit DAC plus sign for precise control

• Fast update rate and minimal step response for responsive analog output

• DIN rail mounting and multiple terminal base compatibility for easy integration

Application Scenarios

• Process automation requiring multiple analog outputs

• Integration with sensors, actuators, and control loops

• High-precision instrumentation in industrial plants

• Multi-channel output for chemical, pharmaceutical, or manufacturing processes

FAQ

Q1: How many isolated analog outputs does this module provide?
A1: The 1794-OF4I provides four independently isolated outputs.

Q2: What output signal types are supported?
A2: Current (4–20 mA, 0–20 mA) and voltage (±10 V, 0–10 V, ±5 V, 0–5 V) signals.

Q3: What is the module’s update rate?
A3: Channels update at 2.5 / 5.0 ms per channel.