Allen Bradley 1746-OB16/D Digital DC Output Module

Product Introduction

The Allen-Bradley 1746-OB16/D is a digital DC output module designed for use within the SLC 500 programmable controller family. It is intended for reliable switching and control of DC-powered field devices in industrial automation systems where consistent output behavior and electrical robustness are required.

This module provides 16 independent DC output points, allowing high output density in a single I/O slot. It is commonly used to control solenoids, relays, indicator lamps, and other DC actuators in machine control and process automation applications. The /D revision represents a specific hardware revision of the 1746-OB16, maintaining functional compatibility while reflecting manufacturing or component-level updates.

Designed for continuous operation in industrial control cabinets, the 1746-OB16/D integrates seamlessly with SLC 500 processors and chassis. Its solid-state output architecture ensures predictable switching performance and long-term reliability in both new installations and existing legacy systems.

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Product Specifications

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Applications

• Industrial machine control, driving DC solenoids, relays, and pilot devices

• Manufacturing automation, providing reliable output control for production equipment

• Material handling systems, switching DC actuators and indicators

• Process control panels, managing DC field devices under PLC supervision

• Packaging and assembly machinery, enabling precise and repeatable output switching

• Legacy SLC 500 systems, maintaining compatibility while replacing or expanding output capacity

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Advantages

• High output point density, delivering 16 DC outputs in a single module

• Solid-state output design, minimizing mechanical wear and maintenance requirements

• Electrical isolation, protecting the controller and backplane from field-side disturbances

• Predictable switching performance, supporting stable machine operation

• Seamless integration with SLC 500, ensuring straightforward configuration and replacement

• Industrial-grade reliability, suitable for continuous duty applications

• Revision compatibility, allowing drop-in replacement within supported systems

FAQ

1. What does the /D revision indicate on the 1746-OB16/D?
   The /D designation identifies a specific hardware revision while maintaining functional compatibility with the 1746-OB16 module family.

2. What types of devices can be controlled by this module?
   It can control DC-powered devices such as solenoids, relays, indicator lamps, and small actuators.

3. Are the output points individually addressable?
   Yes, each of the 16 output points can be controlled independently by the SLC 500 processor.

4. Does the module provide isolation between field wiring and the controller?
   Yes, output-to-backplane electrical isolation is provided to protect system electronics.

5. Is the module suitable for inductive DC loads?
   It supports inductive loads when proper suppression and wiring practices are applied.

6. How is the module powered within the system?
   The module logic is powered by the SLC 500 backplane, while output power is supplied externally.

7. Can this module be used as a direct replacement for earlier OB16 revisions?
   In most cases, it can be used as a direct replacement without changes to the control program.

8. Is the module designed for continuous operation?
   Yes, it is intended for continuous industrial operation in control cabinet environments.

9. How does the module ensure stable switching behavior?
   Solid-state switching technology provides consistent and repeatable output operation.

10. Does replacing the module require reconfiguration in the PLC program?
    Typically no reconfiguration is required when replacing with a compatible 1746-OB16 revision.

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