AB 1794-OF4I
AB 1794-OF4I
AB 1794-OF4I
AB 1794-OF4I
AB 1794-OF4I
AB 1794-OF4I
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1794-OF4I

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Allen-Bradley 1794-OF4I is a four-channel isolated analog output module for FLEX I/O systems.
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Technical specifications for 1794-OF4I

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-OF4I
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O Four-Channel Isolated Analog Output Module
  • Stock:
    1
  • Output Channels:
    4 isolated
  • Conversion Type:
    Digital-to-analog converter
  • Resolution:
    15 bits plus sign
  • Voltage Resolution:
    0.320 mV/count
  • Current Resolution:
    0.656 µA/count
  • Current Output Ranges:
    4–20 mA; 0–20 mA
  • Voltage Output Ranges:
    ±10 V; 0–10 V; ±5 V; 0–5 V
  • Update Rate:
    2.5 ms or 5.0 ms for all channels
  • Step Response:
    Less than 25 µs to 63% of full scale
  • Maximum Voltage-Output Current Load:
    3 mA
  • Resistive Load on Current Output:
    0–750 Ω
  • Absolute Accuracy:
    0.1% full scale at 25 °C
  • Calibration:
    Factory-calibrated; recalibrate when necessary
  • Backplane Current:
    55 mA at 5 V DC
  • External Supply Voltage:
    19.2–31.2 V DC
  • External Supply Current:
    210 mA
  • Power Dissipation:
    4.7 W maximum
  • Thermal Dissipation:
    16 BTU/h maximum
  • Isolation Test:
    850 V DC for 1 second
  • Operating Temperature:
    -20 to +55 °C
  • Approved Terminal Bases:
    1794-TB2, TB3, TB3S, TB3T, TB3TS, TB3G, TB3GS
  • Dimensions:
    9.4 × 4.6 × 5.3 cm
  • Weight:
    0.14 kg
  • Tariff Code:
    8538900000
  • 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 Channel restoration Load and isolation Terminal and wiring checks Application
  • Four isolated analog output channels for FLEX I/O systems
  • Configurable voltage and current ranges with 15-bit-plus-sign resolution
  • Channel-to-channel, channel-to-backplane, and channel-to-power isolation

1794-OF4I is the Allen-Bradley FLEX I/O module for four isolated analog output channels.

Each channel can be configured for the documented current or voltage range, with factory calibration, independent isolation, and selectable update timing.

Before replacement, confirm the terminal base, 24 V DC field power, channel wiring, output mode, scaling, load resistance, update rate, calibration, and controller configuration.

Availability, condition, price, and shipping time for 1794-OF4I are confirmed during quotation.

Allen-Bradley 1794-OF4I Isolated Analog Output Module Manuals, Datasheets, Links

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.

  • Record the voltage or current mode assigned to every channel
  • Preserve engineering scaling, update timing and fault behavior
  • Restore controller ownership and tag mapping before enabling outputs
  • Each output channel is isolated from the other channels
  • Current-loop resistance must remain within the available drive capability
  • Voltage-output loads must remain within the documented current limit
  • Use an approved FLEX I/O terminal base for the installed arrangement
  • Compare terminal designations and keying with the wiring drawing
  • Verify 24 V DC field power, polarity, shields and loop continuity
  • Isolated 4–20 mA and 0–20 mA control loops
  • Isolated bipolar and unipolar voltage commands
  • Distributed analog-output control in FLEX I/O systems
Description
1794-OF4I is an Allen-Bradley FLEX I/O module providing four independently isolated analog output channels.

Each channel can be configured for a supported current or voltage range and provides 15-bit-plus-sign resolution, independent isolation and selectable update timing.

Before replacement, record every channel mode and scaling value, then verify the terminal base, field power, polarity, shielding, connected load, controller ownership and calibration status.
Revisions

Revision Part #

Also known as

1794-OF4I Ser A
1794-OF4I/A, Series A, Rev A
Alternative Names
1794-OF4I 1794 OF4I 1794OF4I Allen-Bradley 1794-OF4I Allen Bradley 1794 OF4I AB 1794-OF4I FLEX I/O 1794-OF4I 1794-OF4I Analog Output
Technical notes
Allen-Bradley 1794-OF4I provides four isolated voltage/current outputs; confirm the approved terminal base, 24 V DC supply, channel ranges, scaling, load, update rate, and calibration before replacement.
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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 channel configuration must be recovered before replacing Allen-Bradley 1794-OF4I?
Record each channel's voltage or current mode, engineering scaling, update rate, fault behavior, load, and controller tag mapping before removing the module.
What must be verified before reconnecting current-loop loads to Allen-Bradley 1794-OF4I?
Confirm whether each loop uses 4–20 mA or 0–20 mA, check polarity and field power, and keep the total resistive load within the documented limit.
Why can Allen-Bradley 1794-OF4I drive a voltage load incorrectly after replacement?
A replacement channel can retain the wrong voltage mode, scaling, polarity or controller mapping. Restore the saved channel configuration and verify the field reference and load before enabling the output.
What should be checked before reusing the existing terminal base with Allen-Bradley 1794-OF4I?
Confirm that the base is one of the approved 1794 types, then compare its terminal designations, keying and field wiring with the installation drawing before inserting the replacement module.
Why can an Allen-Bradley 1794-OF4I channel remain at zero after installation?
The module holds zero output until configured; also check field power, channel mode, scaling, wiring, load, and controller ownership.
Why might an Allen-Bradley 1794-OF4I current loop fail to reach its commanded value?
Excessive field-device and cable resistance can exceed the channel's available drive capability. Also check field power, polarity, loop continuity, channel mode and scaling before treating the module as faulty.
When should Allen-Bradley 1794-OF4I be recalibrated?
It is factory-calibrated; recalibrate when required by the maintenance program or when verification shows accuracy outside the documented limit.

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