Description
Description
The Allen-Bradley 1794-OM8 is a high-performance 8-point digital AC output module designed for the FLEX I/O distributed system. This module provides a reliable interface between PLC/PAC control logic and high-voltage AC field devices, such as actuators, solenoids, and alarm indicators. Engineered for space-efficient industrial applications, the 1794-OM8 allows for seamless integration into distributed control architectures, supporting a nominal output voltage of 240V AC.
Features
- 8-Point Discrete Output Configuration
- High-Voltage AC Switching (159V to 264V AC range)
- Modular FLEX I/O Architecture for flexible system design
- Zero-Cross Switching Technology to reduce electrical noise
- Hot-swappable design when used with compatible terminal bases
Applications
- Packaging and bottling line control
- Assembly automation systems
- Fluid handling and chemical dosing systems
- Industrial HVAC control machinery
- Remote I/O distributed control nodes
Technical Specifications
| Model |
1794-OM8 |
| Number of Outputs |
8, non-isolated |
| Nominal Output Voltage |
240V AC |
| Operating Voltage Range |
159V to 264V AC |
| Output Current Rating |
4.0 A total (8 outputs @ 500 mA each) |
| Surge Current |
7 A for 40 ms |
| Off-state Leakage Current |
2.5 mA max |
| Flexbus Current |
60 mA @ 5V DC |
| Power Dissipation |
5.0 W @ 0.5 A |
| Thermal Dissipation |
17.1 BTU/hr @ 0.5 A |
Installation Guidelines
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Mounting: Secure the compatible FLEX I/O terminal base onto a 35 x 7.5mm DIN rail.
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Keyswitch: Set the keyswitch on the terminal base to position 8 to ensure mechanical compatibility with the 1794-OM8 module.
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Module Insertion: Align the module with the terminal base slots, ensuring pins are straight, and press firmly until the latching mechanism clicks into place.
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Wiring: Ensure all field power is disconnected before installing or removing the module. Use appropriate wire gauges for the terminal base connections.
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Environment: Ensure adequate ventilation for heat dissipation; avoid mounting near high-EMI sources or extreme heat zones.
FAQ
What is the primary function of the 1794-OM8?
The 1794-OM8 is a digital output module used to interface a FLEX I/O system with 240V AC field devices, allowing the controller to switch high-voltage loads.
Is this module hot-swappable?
Yes, the FLEX I/O architecture allows for the electronic module to be removed and replaced while the system is powered, provided it is mounted on a compatible, pre-wired terminal base.
What is the maximum current capacity?
The module supports a maximum of 500 mA per output, with a total module current limit of 4.0 A.
