PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-OB8 is an 8-channel sourcing DC output module for the FLEX I/O distributed system. This module mounts directly into a compatible terminal base unit. It provides physical field device connectivity and Flexbus communication backplane connections. Field wiring terminates entirely on the terminal base unit. Operators can insert or remove the module under power without disturbing field terminations. This capability prevents system interruption during servicing.
The unit provides eight current-sourcing outputs rated for nominal 24V DC operation. Each channel supports up to 500mA continuous load current with an aggregate module capacity of 4A. Individual yellow status LEDs illuminate channel logic states. The module interfaces with ControlNet, DeviceNet, EtherNet/IP, and Universal Remote I/O adapters across the Flexbus backplane. It functions within an operating temperature range of 0 to 55 degrees Celsius.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Line | Flex I/O 1794 |
|---|
| UPC | 612598181292 |
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| Weight | 0.06 lbs (0.03 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 | 4A |
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| On-state Current max. | 500mA per Channel |
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| On-state Voltage Drop max. | 0.5V 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 | 60mA @ 5V DC |
|---|
| Power Dissipation | 3.3W @ 31.2V DC max. |
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| Thermal Dissipation | 11.2 BTU/hr. @ 31.2V DC max. |
|---|
TECHNICAL INFORMATION
Features
- Eight discrete current-sourcing outputs for 24V DC actuator and indicator control.
- Removal and insertion under power support eliminates field wiring disruption during module replacement.
- Yellow LED status indicators display signal conditions for all output channels.
- External power supply support from 10 to 31.2V DC with 5 percent AC ripple.
- Low Flexbus current draw of 60mA at 5V DC backplane logic supply.
TECHNICAL INFORMATION
Installation Guidelines
- Snap the terminal base unit onto an industry standard DIN rail.
- Mount the module directly into the terminal base unit until fully seated.
- Connect external DC power between 10V and 31.2V DC to the designated base terminals.
- Maintain ambient operating temperatures between 0 and 55 degrees Celsius inside the enclosure.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley 1794-TB3, 1794-TB3S, and 1794-TBKD terminal base units.
- Operates with FLEX I/O network communication adapters including EtherNet/IP, ControlNet, DeviceNet, and Universal Remote I/O.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley 1794-TB3, 1794-TB3S, and 1794-TBKD terminal base units. Operates with FLEX I/O network communication adapters including 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 terminal bases can be used with the 1794-OB8?
The 1794-OB8 module is compatible with 1794-TB3, 1794-TB3S, and 1794-TBKD terminal base units.
Can the 1794-OB8 module be removed under power?
Yes. The module supports insertion and removal under power because wiring connects directly to the terminal base.
What is the maximum current rating per channel for the 1794-OB8?
Each sourcing channel supports a maximum continuous current of 500mA. The total module current rating is 4A.
What is the market reference price for the 1794-OB8?
Observed market reference pricing ranges from 89.00 to 195.00 USD across condition grades. These figures are indicative market reference pricing only and are not a final quotation.
