Procure now the 1794-OM8, a high-voltage digital AC output module engineered for the Allen-Bradley FLEX I/O system. This 8-point module is the industrial standard for switching 240V AC loads, providing the power and reliability needed for heavy-duty machinery control.
What Is the 1794-OM8?
The 1794-OM8 is a discrete output module that provides eight non-isolated AC outputs. It is specifically designed to switch voltages in the 240V AC range, making it ideal for controlling large industrial solenoids, heating elements, and motor starters. The module is built onto the compact FLEX I/O form factor, allowing it to fit into small enclosures while providing high-voltage switching capacity. With its support for hot-swapping (RIUP), maintenance teams can replace the module without disconnecting any wiring from the terminal base, significantly reducing repair times in mission-critical environments like chemical plants or oil and gas facilities.
Key Technical Specifications
- Outputs: 8 (non-isolated)
- Voltage Category: 240V AC
- Operating Voltage Range: 159V AC to 264V AC
- Output Current: 1.0A maximum per channel (max 4.0A per module)
- Surge Current: 7A for 45ms
- Off-State Leakage: 2.5mA maximum
- On-State Voltage Drop: 1.0V AC @ 0.5A
- FlexBus Current: 80mA
Architecture and Safety Standards
The 1794-OM8 architecture utilizes high-quality triacs for switching, which offer a much longer lifespan than mechanical relays when switching AC loads. It integrates perfectly with Allen-Bradley communication adapters, providing status data to the master controller. Because this module handles 240V AC, the architecture prioritizes thermal dissipation; the module is designed with internal heat sinking to maintain stable operation even when all channels are under significant load.
Maintenance Tips
Given the high voltage handled by the 1794-OM8, always verify that the terminal base (1794-TBN or 1794-TBNF) is correctly grounded. Periodically check for any discoloration on the terminal base as a sign of overheating due to loose connections. If an output fails to turn off, check for leakage current or a shorted triac; using external fuses on the 1794-TBNF terminal base is the best way to prevent module destruction during a load failure.
Frequently Asked Questions
Q: What is the maximum response time for an output to turn on?
A: The 1794-OM8 has a maximum turn-on time of 1/2 cycle plus any communication latency from the FLEX I/O adapter.
Q: Can I use this module to control a 3-phase motor directly?
A: No, you should use the 1794-OM8 to switch the coil of a 3-phase contactor, which in turn switches the high-power motor circuit.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here: https://atlantechdrives.com/manufacturers/allen-bradley/
