Allen-Bradley 1794-OB16P Output Module

Description

Allen-Bradley 1794-OB16P Output Module

Product Dimensions：

The Allen-Bradley 1794-OB16P is a high-density, sourcing digital output module from the FLEX™ I/O family. It is designed to provide reliable control of 24V DC industrial actuators, solenoids, and indicators in a distributed I/O architecture.

Product Detailed Description

The 1794-OB16P features 16 current-sourcing outputs split into two isolated groups of 8 channels. The primary characteristic of the “P” version is its built-in electronic protection. It continuously monitors the output channels for overcurrent, short-circuit, and overtemperature faults, automatically shutting down affected channels to prevent module damage and field failures.

Technical Parameters

Product Advantages

• Short-Circuit Protection: The integrated electronic protection guards the module against field-wiring shorts, instantly resetting once the fault is cleared without requiring fuse replacements.
• Space-Saving Flex I/O Design: Features a modular, compact footprint where the electronics plug directly into a terminal base. This allows for rapid hot-swapping without disconnecting field wiring.
• Network Versatility: Can be paired with different FLEX I/O adapters to communicate over EtherNet/IP, ControlNet, DeviceNet, or PROFIBUS.
• Granular Isolation: Channels are isolated in two groups of eight, allowing users to safely mix different power sources or isolate fault domains across the module.

Important Considerations & Precautions

• Sourcing Output Behavior: This is a sourcing module (V_{out} = Positive supply voltage). Ensure your field devices are wired as sinking loads (the other side of the load must connect to the DC Common).
• Terminal Base Selection: Ensure you match the module with a compatible terminal base. A 1794-TB3 or 1794-TB3S is highly recommended to easily accommodate the necessary 3-wire connections (Output, Common, and +V DC).
• Power Sequencing: External 24V DC power must be supplied directly to the terminal base to power the output channels; the backplane power from the adapter only powers the module’s internal logic.
• Inductive Loads: When switching highly inductive loads (such as large relay coils or heavy-duty solenoids), external surge suppressors (diodes) should be installed across the load to maximize output transistor lifespan.

Product Applications

The 1794-OB16P is used in a broad spectrum of distributed automation scenarios:

• Conveyor and Sortation Systems: Direct control of sorting gates, pneumatic diverters, and localized stack lights.
• Packaging Machinery: Actuating fast-response solenoid valves, indexing mechanisms, and small labeling devices.
• Water Treatment Plants: Controlling distributed chemical dosing pumps and minor valve actuators housed in remote control cabinets.
• Automotive Assembly Lines: Interfacing localized control blocks back to a central ControlLogix or CompactLogix processor over EtherNet/IP.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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