The Allen-Bradley 1794-OB32P is a high-density digital output module that delivers exceptional channel count in a compact Flex I/O form factor. This unit provides thirty-two non-isolated, sourcing outputs with a nominal voltage of 24V DC. Each channel includes individual electronic protection, safeguarding your system against overcurrent and temperature overloads. Moreover, the 1794-OB32P features two independent output groups with separate voltage sources, offering flexible power distribution. This module is the perfect solution for large-scale control applications requiring numerous protected outputs.
The 1794-OB32P stands out with its comprehensive protection and smart channel grouping. These features enhance system reliability and simplify wiring.
Individual Channel Protection: Each of the 32 output channels has its own electronic fuse. This protection isolates faults to a single point, preventing a single failure from affecting other outputs.
Two Output Groups: The outputs are arranged into two groups of 16 channels. Channels 0 through 15 form Group 1, and Channels 16 through 31 form Group 2. Each group has its own separate voltage source, allowing you to power different loads independently.
Group Current Ratings: Group 1 (Channels 0-15) has a total current rating of 6A. Group 2 (Channels 16-31) has a total current rating of 8A. The total output current rating for the entire 1794-OB32P module is 14.0A.
Surge Current Capability: Each channel can handle a surge current of 2A for 50ms, repeatable every 2 seconds. This capability allows the module to drive loads with high inrush currents.
Status Indication: Thirty-two 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 robust electrical performance for demanding automation tasks. Its specifications ensure reliable control of standard 24V DC field devices.
Output Characteristics
Number of Outputs: The 1794-OB32P provides 32 sourcing outputs arranged in two groups of 16.
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 is 14.0A per module, with 6A for channels 0-15 and 8A for channels 16-31.
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-OB32P is 80mA at 5V DC.
Power Dissipation: Under maximum load at 31.2V DC, the module dissipates up to 5.3W of power.
Thermal Dissipation: Its thermal dissipation is rated at 18.1 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-OB32P 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: The module snaps onto a DIN rail and is inserted into a compatible terminal base unit.
Enclosure: It has an open-type enclosure rating.
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.
Proper installation ensures the longevity and reliability of the Allen-Bradley 1794-OB32P.
Terminal Base Requirements
This module requires a specific terminal base due to its 32-channel density. It is exclusively compatible with the 1794-TB32 and 1794-TB32S terminal base units. The wiring size and termination method depend on the specific terminal base you select.
System Integration
The 1794-OB32P works with any 1794 Flex I/O communication adapter. Therefore, you can integrate it into systems using EtherNet/IP, ControlNet, DeviceNet, or PROFIBUS networks. This flexibility allows you to use it with Logix controllers like ControlLogix and CompactLogix, as well as with legacy controllers.
Your shipment for the Allen-Bradley 1794-OB32P will include the following item:
(1) Allen-Bradley 1794-OB32P Flex I/O Digital Output Module with Electronic Protection
1. What terminal bases are compatible with the 1794-OB32P?
The 1794-OB32P is only compatible with the 1794-TB32 and 1794-TB32S terminal base units due to its 32-channel design.
2. How are the 32 outputs on the 1794-OB32P organized?
The outputs are arranged into two groups of 16 channels. Channels 0-15 form one group with a 6A total, and Channels 16-31 form the second group with an 8A total.
3. What is the total output current rating for the 1794-OB32P?
The total output current rating for the entire 1794-OB32P module is 14.0A (6A for group 1 plus 8A for group 2).
4. Does the 1794-OB32P have individual channel protection?
Yes, each of the 32 channels on the 1794-OB32P includes individual electronic protection against overcurrent and temperature overloads.
5. What is the output signal delay for the 1794-OB32P?
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.
| Brand Name | |
| Model No. | 1794-OB32P |
| Product Type | Discrete Output Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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