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1794-0F4I

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The Allen‑Bradley 1794-0F4I is a high‑performance isolated analog output module from the Allen‑Bradley Flex I/O 1794 series, designed to deliver precise and reliable analog control signals in distributed industrial automation systems.
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Technical specifications for 1794-0F4I

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-0F4I
  • Product Family:
    Flex I/O
  • Resolution:
    15 bits plus sign
  • Voltage:
    0.320 mV/cnt
  • Current:
    0.656 mA/cnt
  • Conversion type:
    Digital-to-analog converter
  • Update rate:
    2.5/5.0 ms all channels
  • Output current terminal:
    0…20 mA output until module is configured
  • Step response to 63% of full-scale:
    < 25 µs
  • Current load on voltage output, max:
    3 mA
  • Resistive load on voltage output:
    0…750 Ω
  • Maximum overload:
    30V continuous or 32 mA continuous, one channel at a time
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    5.1x5.1x10.2cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Installation & Integration Compatibility & Interoperability

Features:

  • Interface Between the FLEX I/O System and Isolated Analog Field Devices
  • Combines Capability of High-Precision Signal Conversion with Channel-to-Channel Isolation
  • Operates in Conjunction with Multiple Terminal Base Units and FLEX I/O Communication Adapters
The Allen-Bradley 1794-0F4I 4 Output Isolated Analog Module serves as a critical analog output interface within the FLEX I/O architecture, providing reliable isolated current and voltage signals to field instrumentation. The 1794-0F4I continuously converts digital control commands from the programmable controller into precise analog outputs, supporting configurable current ranges of 4 to 20 mA and 0 to 20 mA, as well as voltage ranges of ±10 Volts, ±5 Volts, 0 to 10 Volts, and 0 to 5 Volts. Seamless signal integrity is standard with the 1794-0F4I, with channel isolation preventing cross-talk and ground loop interference between outputs. The 1794-0F4I has been engineered to deliver 15-bit plus sign resolution with exceptional accuracy of 0.1% full scale at 25 degrees Celsius.

The 1794-0F4I provides essential analog output functions for distributed control applications, and is a critical component of the control signal path, directly affecting the proper, precise operation of field actuators and process equipment. One or multiple 1794-0F4I modules may be deployed per FLEX I/O rack depending on the number of analog control points required.

For isolated multi-channel control applications, the 1794-0F4I provides four independent analog output channels with individual channel isolation. In addition to standard signal generation, the 1794-0F4I performs automatic output ranging based on user configuration. The 1794-0F4I module executes signal conversion using internal digital-to-analog circuitry specified in the module specifications. Using this method, the 1794-0F4I continually maintains output stability with update rates of 2.5 or 5 milliseconds for all channels. If the system detects configuration changes or power cycle events, the 1794-0F4I initializes outputs to 0 until valid configuration data is established.

The 1794-0F4I Allen-Bradley 4 Output Isolated Analog Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1794-0F4I 4 Output Isolated Analog Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1794-0F4I 4 Output Isolated Analog Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1794-0F4I
  • Condition New Original ready stock
  • Product Family 1794-OF4IXT,1794-IF4I,1794-IF4IXT
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Distributed Control Systems: Used across industries such as Water Treatment, Oil & Gas, and Automotive to manage remote analog devices while minimizing long wiring runs.
  • Safety & Compliance: Certified for use in SIL 2 safety-related applications (when used in 1oo2 configurations) and listed for Class I Division 2 hazardous locations.
  • High-Noise Environments: Its channel-to-channel isolation protects against signal interference and voltage spikes, critical in power plants or heavy manufacturing.
  • Precision Actuator Control: Ideal for driving proportional valves, motor drives, and actuators that require high accuracy and electrical isolation to prevent ground loops.
  • Terminal Base Mounting: The module must be snapped onto a compatible terminal base (like the 1794-TB3). Ensure the keyswitch on the base is rotated clockwise to Position 4 before insertion.
  • Power Connections: Connect external 24V DC power (19.2–31.2V DC) to terminal 34 and the common return to terminal 16.
  • Signal Wiring: Connect individual output leads to the numbered terminals on Row A.
  • Crucial: Connect only one current or one voltage signal per channel; never both simultaneously.
  • Use shielded copper wire and ground the shield as close to the module as possible to reduce noise.
  • Hot Swapping (RIUP): The module supports Removal and Insertion Under Power, allowing you to replace modules without interrupting the rest of the FLEX backplane system.
  • Terminal Bases: Fully compatible with various FLEX I/O bases.
  • Communication Adapters: Integrates with any 1794 FLEX communication adapter to connect to major networks like EtherNet/IP, ControlNet, and DeviceNet.
  • Controller Families: Works seamlessly with ControlLogix and CompactLogix systems using Studio 5000 Logix Designer for configuration.
  • Backward Compatibility: The 1794-OF4IXT (extended temperature) version is a direct drop-in replacement for standard environments requiring higher durability.
Description
The Allen‑Bradley 1794-0F4I is a high‑performance isolated analog output module from the Allen‑Bradley Flex I/O 1794 series, designed to deliver precise and reliable analog control signals in distributed industrial automation systems.

This module provides four (4) individually isolated analog output channels, each capable of generating configurable current (4‑20 mA, 0‑20 mA) or voltage (±10 V, 0‑10 V, ±5 V, 0‑5 V) outputs, making it suitable for controlling field devices such as valves, actuators, drives, and other process devices. Its 15‑bit plus sign resolution and high conversion accuracy (approximately 0.1 % of full scale at 25 °C) ensure fine analog control performance and consistent signal quality across all channels.

The module is part of the modular Flex I/O architecture, allowing distributed placement close to sensors and actuators, and communicates over the FlexBus interface, which supplies both data and power to the module. 

It requires a 24 V DC external supply (nominal 19.2–31.2 V DC range) and is compatible with a variety of 1794 terminal base units (such as 1794‑TB2, ‑TB3, ‑TB3S, ‑TB3T, ‑TB3TS, and 1794‑TBN), offering flexible mounting options including DIN‑rail or panel mounting.
Revisions

Revision Part #

Also known as

1794-0F4I Ser A
1794-0F4I/A, Series A, Rev A
Alternative Names
I794-OF4I I794-0F4I I794-0F41
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What type of signals does the 1794-0F4I support?
The 1794-0F4I provides four isolated analog output channels that can be configured for a variety of current and voltage signal types, including 4–20 mA, 0–20 mA, ±10 VDC, 0–10 VDC, ±5 VDC, and 0–5 VDC, allowing flexible control of field devices such as valves, actuators, and drives.
How is the 1794-0F4I powered and mounted?
This module requires an external 24 V DC power supply (nominal 19.2–31.2 V DC) and mounts via DIN rail or panel with a compatible Flex I/O terminal base (e.g., 1794‑TB2, 1794‑TB3, or 1794‑TBN).
What makes the 1794-0F4I suitable for industrial use?
Each output channel is individually isolated, which helps prevent ground loops and reduces interference, and the module offers high resolution (15‑bit plus sign), fast update rates (2.5 ms or 5 ms for all channels), and robust environmental ratings for reliable operation in harsh industrial environments.