PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-OB8EP FLEX I/O Digital Output Module provides eight current-sourcing outputs. This module operates with a nominal on-state voltage of 24V DC. It features electronic fuse protection designed to disconnect an individual output under fault conditions. Each channel supports up to 2A, with a maximum module load of 10A. Field connections terminate on an external terminal base rather than directly on the module. This design allows module removal and insertion under power without rewiring field devices.
The module interfaces with the FLEX I/O communication adapters across the backplane Flexbus. It draws 73mA of backplane current at 5V DC from the adapter. External field power requirements range from 19.2 to 31.2V DC with up to 5 percent AC ripple. Sixteen yellow status indicators provide visual feedback for channel activity and fault detection. Maximum power dissipation is rated at 5.5W at 31.2V DC. Thermal dissipation reaches 18.8 BTU per hour under peak operating conditions.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Line | Flex I/O 1794 |
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| UPC | 612598172641 |
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| Weight | 0.38 lbs (0.17 kg) |
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| Outputs | 8 Sourcing Current |
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| On-state Voltage nom. | 24V DC |
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| Output Current Rating | 2A max. per Output |
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| On-state Current max. | 2A per Channel |
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| On-state Voltage Drop max. | 0.2V DC |
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| Off-state Leakage Current max. | 0.5mA |
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| Isolation Voltage | 50V Continuous |
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| Flexbus Current | 73mA @ 5V DC |
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| Power Dissipation | 5.5W @ 31.2V DC max. |
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| Thermal Dissipation | 18.8 BTU/hr. @ 31.2V DC max. |
|---|
TECHNICAL INFORMATION
Features
- Eight current-sourcing 24V DC digital output points.
- Integrated electronic fuse protection to isolate output circuit faults.
- Removal and insertion under power capability without disturbing field wiring.
- Sixteen yellow LED status indicators for status and fault monitoring.
- Fast switching response with 0.1ms maximum turn-on and turn-off delay.
- Continuous isolation voltage rating of 50V.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to communication adapters via the 1794 backplane Flexbus.
- Direct termination to compatible 1794 terminal base units.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the compatible terminal base directly onto an industrial DIN rail.
- Align the module over the terminal base and press firmly to seat.
- Connect external 24V DC supply wiring to the designated base terminals.
- Maintain adequate enclosure ventilation to support heat dissipation.
TECHNICAL INFORMATION
Compatibility
- Compatible with terminal bases 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, and 1794-TBKD.
- Works with FLEX I/O network adapters for EtherNet/IP, ControlNet, DeviceNet, and Universal Remote I/O.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with terminal bases 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, and 1794-TBKD. Works with FLEX I/O network adapters for EtherNet/IP, ControlNet, DeviceNet, and Universal Remote I/O.
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 does the EP designation signify on the 1794-OB8EP?
The EP designation indicates electronic fuse protection that disconnects an individual output when an overcurrent fault occurs.
Can the 1794-OB8EP be installed or removed under power?
Yes, the module supports removal and insertion under power because field wiring connects directly to the terminal base.
Which terminal bases can be used with the 1794-OB8EP?
Compatible terminal bases include the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, and 1794-TBKD.
What is the indicative market pricing for the 1794-OB8EP?
Observed market pricing is approximately $89.00 USD for refurbished units. These figures are indicative market reference pricing only and are not a final quotation.
