PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-OM8 is a FLEX I/O Digital Output Module featuring eight nonisolated AC outputs. The unit connects field loads through a compatible terminal base to the central Flexbus backplane. Field wiring attaches directly to the terminal base rather than the module. This design allows technicians to remove and insert the module under power. Operating line voltages range from 159V AC to 264V AC with a 240V AC nominal rating.
Each output channel handles up to 500 mA continuous current at 55 degrees Celsius. Total module current capacity reaches 4.0 A across all eight output circuits. The internal circuit maintains a maximum on-state voltage drop of 1.5V AC at 0.5 A. Backplane power consumption requires 60 mA of Flexbus current at 5V DC. Yellow status LEDs provide channel indication for field troubleshooting and operational checks.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Line | Flex I/O 1794 |
|---|
| UPC | 612598179978 |
|---|
| Weight | 1.88 lbs (0.85 kg) |
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| Outputs | 8 Nonisolated |
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| Output Voltage nom. | 240V AC |
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| Output Current Rating | 4.0A |
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| On-state Current max. | 500mA per Output |
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| On-state Voltage Drop max. | 1.5V AC @ 0.5A |
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| Off-state Leakage max. | 2.5mA |
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| Isolation Voltage | 250V Continuous |
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| Flexbus Current | 60mA @ 5V DC |
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| Power Dissipation | 5W @ 0.5A max. |
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| Thermal Dissipation | 17.1 BTU/hr. @ 0.5A max. |
|---|
TECHNICAL INFORMATION
Features
- Provides eight nonisolated 240V AC digital output points.
- Permits removal and insertion under power without rewiring field connections.
- Supplies up to 500 mA continuous current per output channel at 55 degrees Celsius.
- Supports a total module output current rating of 4.0 A.
- Draws 60 mA of Flexbus current at 5V DC from the communication adapter.
- Includes individual yellow LED indicators for output channel status monitoring.
- Operates in ambient temperatures between 0 and 55 degrees Celsius.
TECHNICAL INFORMATION
Applications
- Distributed AC control in FLEX I/O stations using EtherNet/IP, ControlNet, DeviceNet, or Universal Remote I/O.
- Switching 240V AC circuits within the 159V AC to 264V AC operating voltage range.
TECHNICAL INFORMATION
Connections / Interfaces
- Mounts onto 1794-TBN and 1794-TBNF terminal base units.
- Connects to the system communication adapter through the Flexbus backplane interface.
- Operates with ControlNet, DeviceNet, EtherNet/IP, and Universal Remote I/O adapters.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the compatible terminal base directly onto a DIN rail.
- Align the module over the terminal base and press down firmly to secure it.
- Complete all field wiring on the terminal base unit before applying circuit power.
- Maintain ambient enclosure temperatures within the rated 0 to 55 degrees Celsius range.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure the module in the controller software using the appropriate communication adapter profile.
- Ensure connected loads draw at least 5 mA to maintain proper on-state operation.
- Verify that off-state leakage current of 2.5 mA does not activate connected loads.
TECHNICAL INFORMATION
Compatibility
- Allen-Bradley 1794-TBN terminal base unit.
- Allen-Bradley 1794-TBNF terminal base unit.
- Allen-Bradley FLEX I/O communication adapters for EtherNet/IP, ControlNet, DeviceNet, and Universal Remote I/O.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSAllen-Bradley 1794-TBN terminal base unit. Allen-Bradley 1794-TBNF terminal base unit. Allen-Bradley FLEX I/O communication 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 terminal base units are compatible with the 1794-OM8 module?
The 1794-OM8 installs onto the 1794-TBN and 1794-TBNF terminal base units.
Can the 1794-OM8 module be removed under power?
Yes. The module supports removal and insertion under power because field wiring terminates on the base.
What is the operating voltage range for the 1794-OM8 output channels?
The nominal voltage is 240V AC, with an operating range of 159V AC to 264V AC.
What is the maximum current capacity per output point?
Each output point supports up to 500 mA continuous current at 55 degrees Celsius.
