Product Overview
The Allen-Bradley 1794-OM8 is a Flex I/O Digital Output Module from Rockwell Automation, designed for reliable AC switching in industrial environments. With 8 nonisolated outputs rated at 240V AC nominal and 4.0A total current, this module efficiently drives solenoids, contactors, and indicators. Its hot-swappable design reduces downtime by allowing module replacement without powering down the system.
Technical Specifications Breakdown
Key parameters for the 1794-OM8 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Output Type | Digital Output Module |
| Number of Outputs | 8 Nonisolated |
| Output Voltage (nom.) | 240V AC |
| Output Current Rating | 4.0A |
| On-state Voltage Drop (max.) | 1.5V AC @ 0.5A |
| Off-state Leakage (max.) | 2.5mA |
| Isolation Voltage | 250V Continuous |
| Flexbus Current | 60mA @ 5V DC |
| Power Dissipation | 5W @ 0.5A max. |
| Thermal Dissipation | 17.1 BTU/hr. @ 0.5A max. |
Industry Applications
Its 240V AC nominal voltage suits motor starters and valve actuators in manufacturing lines. The nonisolated design simplifies wiring in common-ground installations, reducing component count and cost.
Installation & Setup Guidance
Mount the 1794-OM8 on a DIN rail using compatible terminal bases (1794-TBNF or 1794-TBN). Ensure the Flexbus connector is properly seated for communication. The module supports hot insertion under power, but always follow lockout/tagout procedures for safety. Connect field wiring per the terminal base labeling, respecting the 250V continuous isolation voltage.
Maintenance & Reliability
Operate within 0–55 °C (32–131 °F) and 5–95% noncondensing humidity for optimal life. Inspect connections annually for corrosion or looseness. The XT versions offer enhanced protection for extreme environments, reducing panel maintenance.
Compatibility & Integration
This module integrates with ControlNet, DeviceNet, EtherNet/IP, and Universal Remote I/O networks via the Flexbus backplane. It works with Allen-Bradley controllers and 1794 series I/O. The 16 yellow LED indicators per channel simplify status monitoring.
Selection Guide & Purchasing Advice
For applications requiring 240V AC digital outputs with moderate current (up to 500mA per channel), the 1794-OM8 is a cost-effective choice. Verify lifecycle status with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 1794-OM8 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
