PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-OF4I is a FLEX I/O Analog Output Module featuring four isolated output channels. Each isolated channel operates independently to eliminate electrical ground loops. The module provides user-configurable current ranges of 0 to 20 mA and 4 to 20 mA. Selectable voltage ranges include 0 to 5V, 0 to 10V, and bipolar options. Terminal outputs remain at zero signal until configuration is complete.
Digital-to-analog conversion delivers a resolution of 15 bits plus sign. The voltage resolution is 0.320 mV per count. The current resolution is 0.656 mA per count. Nominal external supply input is 24V DC within 19.2 to 31.2V DC. The module draws 50 mA FlexBus current at 5V DC. Mounting options include standard DIN rail or panel installation.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Product Line | Flex I/O 1794 |
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| UPC | 612598171583 |
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| Weight | 0.56 lbs (0.26 kg) |
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| Update Rate | 2.5/5.0 ms all channels |
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| Conversion Type | Digital to Analog Converter |
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| Resolution | 15 bits plus sign |
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| Product Description | Flex IO High Output Module |
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| No. of outputs | Four (4) Isolated |
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| Output type | 4-20 mA, 0-20 mA and ±10VDC; 0-10VDC; +/- 5VDC and 0-5VDC |
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| Voltage Resolution | 0.320 mV/cnt |
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| Current resolution | 0.656 mA/cnt |
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| Step response to 63% of full scale | < 25 s |
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| Terminal base | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794- TB3TS, 1794-TBN |
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| External DC supply, nom | 24V DC |
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| External DC supply range | 19.2…31.2V DC (includes 5% AC ripple) |
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| Mounting | DIN Rail |
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| Operating Temperature | 0 to 55 C (32 to 131 F) |
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| Storage Temperature | –40…85 °C (–40…185 °F) |
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| Vibration | 5g @ 10 to 500 Hz |
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| Operating Shock | 30 g |
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| Outputs | 4 Isolated |
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| Current Load on Voltage Output | 3mA max. |
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| FlexBus Current | 50mA |
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| Isolation Voltage | 120V Continuous |
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| Output Current Terminal | 4-20mA |
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| Output Voltage Terminal | +/- 10V |
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| Thermal Dissipation | 16 BTU/hr. @ 31.2V DC max. |
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TECHNICAL INFORMATION
Features
- Four isolated analog output channels provide independent signal paths.
- Configurable current output ranges include 4 to 20 mA and 0 to 20 mA.
- Configurable voltage output ranges include 0 to 5V, 0 to 10V, and bipolar spans.
- Digital-to-analog conversion offers 15 bits plus sign resolution.
- Selectable channel update rates include 2.5 ms and 5.0 ms.
- Step response reaches 63 percent of full scale in under 25 microseconds.
- Continuous channel isolation is rated up to 250V depending on the base.
TECHNICAL INFORMATION
Applications
- Isolated analog current loop control within distributed FLEX I/O systems.
- Isolated analog voltage reference control in industrial automation architectures.
TECHNICAL INFORMATION
Connections / Interfaces
- Mounts onto compatible terminal base units including 1794-TB2 and 1794-TB3.
- Supports terminal bases 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN.
- Draws 50 mA backplane current at 5V DC FlexBus voltage.
- Accepts external DC power from 19.2 to 31.2V DC.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the module assembly onto a DIN rail or enclosure sub-panel.
- Seat the module securely onto an installed FLEX I/O terminal base.
- Maintain ambient operating temperatures between 0 and 55 degrees Celsius.
- Verify external DC supply stays between 19.2 and 31.2V DC.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure output ranges and channel operating modes via control software.
- Select an update rate of 2.5 ms or 5.0 ms across channels.
- Perform manual field calibration if application requirements demand adjustments.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley FLEX I/O communication adapters.
- Operates with terminal base units 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN.
TECHNICAL INFORMATION
Compliance and Certifications
- Approved for use in hazardous locations.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley FLEX I/O communication adapters. Operates with terminal base units 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What output ranges does the Allen-Bradley 1794-OF4I module support?
The 1794-OF4I supports current ranges of 4 to 20 mA and 0 to 20 mA. It also provides voltage ranges of 0 to 5V, 0 to 10V, and bipolar spans.
Which terminal bases are compatible with the 1794-OF4I module?
Compatible bases include 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN. Isolation voltage ratings depend on the selected base.
What is the conversion resolution of the 1794-OF4I module?
The module provides 15 bits plus sign resolution. Voltage resolution is 0.320 mV per count. Current resolution is 0.656 mA per count.
What are the power requirements for the 1794-OF4I module?
The module requires 24V DC nominal power between 19.2 and 31.2V DC. FlexBus current draw is 50 mA at 5V DC.
What is the reference price for the 1794-OF4I?
Any published pricing figures are indicative market reference pricing only and are not a final quotation. Quotations vary by condition, stock, and destination.
