The Allen-Bradley 1794-OB16P is a high-reliability digital output module that includes electronic protection on every channel. This unit provides sixteen non-isolated, sourcing outputs with a nominal voltage of 24V DC. Its key advantage lies in the individual electronic fusing for each output, which prevents damage from overcurrent events. Furthermore, the 1794-OB16P simplifies system design by reducing the need for external fusing components. This module is an excellent choice for applications requiring robust output protection.
The standout feature of the 1794-OB16P is its comprehensive electronic protection. This built-in safeguard enhances system reliability and reduces maintenance costs.
Individual Channel Fusing: Each of the 16 output channels has its own electronic fuse. This protection isolates faults to a single point without affecting other outputs.
Automatic Reset: The electronic fusing typically resets automatically once the fault condition is removed. This feature minimizes downtime and manual intervention.
Surge Current Handling: Each channel can withstand a surge current of 1.5A for 50ms, repeatable every 2 seconds. This capability allows the module to drive loads with high inrush currents, such as solenoids and lamps.
Status Indication: Sixteen 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 dependable electrical performance for a wide range of automation tasks. Its specifications ensure reliable control of standard 24V DC field devices.
Output Characteristics
Number of Outputs: The 1794-OB16P provides 16 sourcing outputs arranged in a single, non-isolated group.
Voltage Range: The on-state voltage range is from 10V DC minimum to 31.2V DC maximum, with a nominal voltage of 24V DC.
Current Ratings: Each channel supports a minimum on-state current of 1.0mA and a maximum of 500mA. The total output current rating for all 16 channels is 8A.
Voltage Drop: The maximum on-state voltage drop is only 0.5V DC, ensuring efficient power delivery to the load.
Signal Delay: The module offers a fast off-to-on signal delay of 0.5ms and an on-to-off delay of 1.0ms maximum.
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-OB16P is 60mA at 5V DC.
Power Dissipation: Under maximum load at 31.2V DC, the module dissipates up to 5.0W of power.
Thermal Dissipation: Its thermal dissipation is rated at 17.0 BTU/hr under maximum load conditions.
Isolation Voltage: The module provides reinforced isolation, tested at 2121V DC for 1 second between the user and 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-OB16P is built to withstand harsh industrial settings.
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: The module snaps onto a DIN rail and is inserted into a compatible terminal base unit.
Conductors: It accepts stranded wire up to 12 gauge (4mm²) with a maximum insulation thickness of 3/64 inch (1.2mm).
Environmental Limits
Operational Temperature: You can operate this unit in environments from 0 to 55°C (32 to 131°F).
Storage Temperature: For storage, the acceptable range is -40 to 85°C (-40 to 185°F).
Shock and Vibration: The module withstands 30g of operating shock and is tested to 5g of vibration at 10-500Hz per IEC 68-2-6.
Humidity: It functions correctly in conditions with 5 to 95% non-condensing relative humidity.
Agency Certification: The 1794-OB16P carries Class I Division 2, Groups A, B, C, D certification, along with UL, CSA, and CE marks.
Proper installation ensures the longevity and reliability of the Allen-Bradley 1794-OB16P.
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-TB3K, and 1794-TB3SK base units. The wiring size and termination method depend on the specific terminal base you select.
Communication Adapters
The Flex I/O platform supports various communication adapters. Therefore, the 1794-OB16P can be used in systems with EtherNet/IP, ControlNet, DeviceNet, and PROFIBUS 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.
System Integration
You can mix the 1794-OB16P with any type of Flex I/O modules to implement a distributed I/O architecture. This modular approach provides scalability for machine and process control applications.
Your shipment for the Allen-Bradley 1794-OB16P will include the following item:
(1) Allen-Bradley 1794-OB16P Flex I/O Digital Output Module with Electronic Protection
1. What does the "P" designation mean in the 1794-OB16P model number?
The "P" in 1794-OB16P stands for "Protected." It indicates that each output channel includes individual electronic fusing for overcurrent protection.
2. What is the surge current rating for the 1794-OB16P?
Each channel on the 1794-OB16P can handle a surge current of 1.5A for 50ms, and this surge is repeatable every 2 seconds.
3. Which terminal bases are compatible with the 1794-OB16P?
This module is compatible with the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, and 1794-TB3SK terminal base units.
4. What is the output signal delay for the 1794-OB16P?
The off-to-on signal delay is 0.5ms maximum, and the on-to-off delay is 1.0ms maximum, ensuring fast and responsive output control.
5. How does the electronic protection on the 1794-OB16P compare to using external fuses?
The electronic protection on the 1794-OB16P provides faster response times and typically resets automatically after a fault clears. This feature reduces downtime and eliminates the need to replace physical fuses.
| Brand Name | |
| Model No. | 1794-OB16P |
| Product Type | Discrete Output Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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