The Allen-Bradley 1794-OB8EP is a high-power digital output module designed for demanding applications requiring significant current per channel. This unit provides eight non-isolated, sourcing outputs with a nominal voltage of 24V DC. Each channel delivers a robust 2A continuous current, making the 1794-OB8EP suitable for driving large solenoids, motor contactors, and other high-inrush loads. Furthermore, this module includes individual electronic fusing on every output. The 1794-OB8EP offers a powerful and protected solution for heavy-duty control tasks.
The 1794-OB8EP combines high current handling with comprehensive protection. These features ensure reliable operation and safeguard your system from faults.
Electronic Fusing: Each output channel includes an electronic fuse that disconnects the output if a fault occurs. This protection isolates faults to a single point, preventing damage to the module and the system.
High Current Rating: The 1794-OB8EP delivers 2A per channel, which is four times the standard output module rating. This high current capability allows you to drive larger loads directly without external interposing relays.
Total Output Current: The total output current rating for all 8 channels is 10A per module. This aggregate rating supports multiple high-power loads simultaneously.
Low Voltage Drop: The module features an exceptionally low on-state voltage drop of only 0.2V DC maximum. This characteristic ensures efficient power delivery and reduces heat generation.
Status Indication: Eight yellow LED indicators provide clear visual status for each channel. These indicators are logic-driven and help with quick on-site troubleshooting.
This output module delivers high-power electrical performance for demanding automation tasks. Its specifications ensure reliable control of heavy-duty 24V DC field devices.
Output Characteristics
Number of Outputs: The 1794-OB8EP provides 8 sourcing outputs in a single, non-isolated group.
Voltage Range: The on-state voltage range is from 19.2V DC minimum to 31.2V DC maximum, with a nominal voltage of 24V DC.
Current Ratings: Each channel supports a maximum on-state current of 2.0A. The total output current rating for all 8 channels is 10.0A.
Voltage Drop: The maximum on-state voltage drop is only 0.2V DC, ensuring efficient power delivery to high-current loads.
Signal Delay: The module offers an extremely fast output signal delay of just 0.1ms for both off-to-on and on-to-off transitions. This rapid response is crucial for precision control applications.
Off-State Leakage: The maximum off-state leakage current is a low 0.5mA, which prevents unwanted current flow when the output is off.
Power and Isolation
FlexBus Current: The maximum FlexBus current drawn by the 1794-OB8EP is 73mA at 5V DC.
Power Dissipation: Under maximum load at 31.2V DC, the module dissipates up to 5.5W of power.
Thermal Dissipation: Its thermal dissipation is rated at 18.8 BTU/hr under maximum load conditions.
Isolation Voltage: The module provides a continuous isolation voltage of 50V between the field side and the system. However, there is no isolation between the individual output channels.
Understanding the physical and environmental limits is essential for a successful installation. The 1794-OB8EP is built to perform reliably in demanding industrial environments.
Physical Dimensions
Dimensions (HxWxD): The module measures 46mm x 94mm x 53mm (1.8in x 3.7in x 2.1in).
Weight: This unit weighs approximately 78 grams (2.75 oz).
Installation: You can install the module by snapping it onto a DIN rail. It is inserted into a compatible terminal base unit.
Hot Swapping: A key advantage of the Flex I/O system is that you can insert or remove the 1794-OB8EP under power. Since the module has no direct wiring, this saves time and eliminates system restart inefficiencies.
Environmental Limits
Operational Temperature: You can operate this unit in environments from 0 to 55°C (32 to 131°F). For extreme environments, XT-rated versions are also available.
Storage Temperature: For storage, the acceptable range is -40 to 85°C (-40 to 185°F).
Humidity: It functions correctly in conditions with 5 to 95% non-condensing relative humidity.
Hazardous Location Rating: The 1794-OB8EP is rated for safe operation in hazardous locations, making it suitable for use in potentially explosive atmospheres.
Proper installation ensures the longevity and reliability of the Allen-Bradley 1794-OB8EP.
Terminal Base Requirements
This module must be mounted on a compatible terminal base unit. Specifically, it is designed for use with the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, and 1794-TBKD base units. The wiring size and termination method depend on the specific terminal base you select. For high-current applications, ensure you use appropriate wire gauges.
Communication Adapters
The Flex I/O platform supports various communication adapters. Therefore, the 1794-OB8EP can be used in systems with EtherNet/IP, ControlNet, DeviceNet, and Universal Remote I/O networks. This flexibility allows you to integrate it with Logix controllers like ControlLogix and CompactLogix, as well as legacy controllers such as PLC-5 and SLC 500.
Your shipment for the Allen-Bradley 1794-OB8EP will include the following item:
(1) Allen-Bradley 1794-OB8EP Flex I/O High-Current Digital Output Module with Electronic Protection
1. What is the maximum current per channel on the 1794-OB8EP?
The 1794-OB8EP delivers a maximum of 2.0A per channel, which is significantly higher than standard output modules.
2. What does the "EP" designation mean in the 1794-OB8EP model number?
The "EP" stands for "Electronic Protection." This indicates that each output channel includes an electronic fuse that disconnects the output if a fault occurs.
3. What is the total output current rating for the 1794-OB8EP?
The total output current rating for the entire 1794-OB8EP module is 10.0A across all 8 channels.
4. What is the output signal delay for the 1794-OB8EP?
The output signal delay is only 0.1ms for both on-to-off and off-to-on transitions. This fast switching speed is ideal for high-precision control applications.
5. Which terminal bases are compatible with the 1794-OB8EP?
This module is compatible with the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, and 1794-TBKD terminal base units.
| Brand Name | |
| Model No. | 1794-OB8EP |
| Product Type | Discrete Output Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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