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1794-OB8EP

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Allen-Bradley 1794-OB8EP is an eight-point 24 V DC sourcing FLEX I/O output module with electronic protection and per-channel fault indication.
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Technical specifications for 1794-OB8EP

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-OB8EP
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O Eight-Point Electronically Protected DC Output Module
  • Stock:
    1
  • Output Points:
    8 current-sourcing outputs
  • Field Supply Range:
    19.2…31.2 V DC
  • Nominal Field Supply:
    24 V DC
  • Maximum Output Current:
    2 A per output
  • Maximum Module Current:
    10 A
  • Output Surge:
    4 A for 50 ms, repeatable every 3 seconds
  • Protection:
    Electronic output protection with fault status
  • Status Indicators:
    8 yellow output indicators and 8 red fault indicators
  • Maximum Off-State Leakage:
    0.5 mA
  • FLEXBUS Current:
    73 mA at 5 V DC
  • Operating Temperature:
    -20…55 °C
  • Dimensions:
    9.4 × 4.6 × 5.3 cm
  • Weight:
    0.104 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 Output Protection Load Matching Fault Recovery Application
  • Eight current-sourcing DC outputs with electronic fault protection
  • Operates from a 19.2…31.2 V DC field supply for nominal 24 V DC systems
  • Channel indicators and controller status support fault identification and reset

1794-OB8EP combines eight higher-current DC sourcing outputs with electronic fault protection at the distributed I/O point.

A tripped channel can be identified from its red indicator and controller status, then reset after the field fault has been corrected.

Match the positive-logic load, supply, base wiring, surge duty, suppression, and reset method before returning the station to service.

Availability, condition, price, and shipping time for 1794-OB8EP are confirmed during quotation.

Allen-Bradley 1794-OB8EP FLEX I/O Eight-Point Electronically Protected DC 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.

  • Each sourcing output is electronically protected against documented fault conditions.
  • Red channel indicators and controller status identify a tripped output.
  • Correct the field fault before using the approved reset method.
  • Connect only compatible positive-logic DC loads to the sourcing outputs.
  • Check steady current and starting surge against both channel and module limits.
  • Use suitable suppression for inductive loads without reversing required polarity.
  • Inspect the channel wiring and load before attempting a reset.
  • Choose front-button, controller-bit, or power-cycle reset according to the safe procedure.
  • Confirm normal status indication and commanded operation before restoring production.
  • Protected switching of compatible 24 V DC solenoids and actuators in distributed FLEX I/O stations.
  • Machine-output control requiring per-channel electronic fault detection and reset capability.
  • Higher-current DC load control where sourcing polarity and channel diagnostics are required.
Description
Allen-Bradley 1794-OB8EP provides eight current-sourcing DC outputs for a FLEX I/O station and electronically protects each channel against an output fault.

The module reports output faults through red indicators and status bits, supports a documented reset process, and operates from a 19.2…31.2 V DC field supply.

Before installation, verify sourcing-load polarity, terminal-base compatibility, channel current and surge, group commons, suppression, field power, reset logic, and the saved output map.
Revisions

Revision Part #

Also known as

1794-OB8EP Ser A
1794-OB8EP/A, Series A, Rev A
Alternative Names
1794-OB8EP 1794OB8EP 1794 OB8EP Allen-Bradley 1794-OB8EP Allen Bradley 1794-OB8EP AB 1794-OB8EP Rockwell Automation 1794-OB8EP
Technical notes
1794-OB8EP provides protected sourcing outputs; verify load polarity, inrush, terminal base, suppression, reset behavior, and output mapping 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.
Will Allen-Bradley 1794-OB8EP work with sinking field loads?
The module provides sourcing outputs, so each field device must be wired for compatible positive-logic operation with the correct DC common and supply polarity.
How is a faulted Allen-Bradley 1794-OB8EP output reset?
First remove the short or overload, then use the documented front reset, controller reset bit, or module power cycle as appropriate for the machine’s safe restart procedure.
What must be checked before replacing Allen-Bradley 1794-OB8EP?
Record the terminal base, keyswitch, load polarity, channel map, supply and commons, reset logic, fault handling, suppression, current demand, and slot position.
Why can Allen-Bradley 1794-OB8EP trip when a load appears to be within its running current?
Starting or inductive inrush can exceed the electronic protection threshold even when steady current is acceptable. Check surge profile, suppression, wiring faults, and supply behavior.
Can Allen-Bradley 1794-OB8EP output channels share one field supply?
They can operate from the documented field supply arrangement, but verify total module current, conductor and terminal capacity, common wiring, branch protection, and voltage drop.
What should the red indicators on Allen-Bradley 1794-OB8EP be used to diagnose?
Match each red indication to its channel fault bit, then inspect that output circuit for a short, overload, incorrect polarity, damaged load, or wiring error before resetting.
Is an ordinary unprotected DC output module a direct substitute for Allen-Bradley 1794-OB8EP?
Not automatically. Removing electronic protection, fault indication, current capability, or reset behavior can change machine diagnostics and risk; compare the complete circuit and controller logic.

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