Allen Bradley 1746-OB16 Digital DC Output Module

Product Introduction

The Allen-Bradley 1746-OB16 is a digital DC output module designed for the SLC 500 programmable controller platform. It provides reliable control of DC-powered field devices in industrial automation systems where stable switching performance and predictable electrical behavior are required.

This module offers 16 independent DC output points, enabling high output density within a single SLC 500 I/O slot. Operating within a 10–30 VDC voltage range and supporting a total output capacity of 8 A, the 1746-OB16 is suitable for driving solenoids, relays, indicators, and other DC loads commonly found in industrial control panels.

Built for continuous industrial operation, the 1746-OB16 emphasizes electrical robustness, consistent output behavior, and seamless integration with SLC 500 processors. Its design supports efficient wiring practices and dependable long-term operation in both new installations and legacy control systems.

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Product Specifications

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Applications

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

• Material handling systems, controlling sensors, actuators, and DC indicators

• Manufacturing production lines, enabling reliable output control for automation equipment

• Process automation panels, switching DC loads under PLC control

• Packaging and assembly machinery, supporting fast and repeatable output switching

• Legacy SLC 500 installations, expanding DC output capacity without system redesign

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Advantages

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

• Wide DC voltage range, allowing compatibility with common industrial power supplies

• High total current capacity, supporting multiple loads from one module

• Solid-state output design, reducing mechanical wear and maintenance

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

• Stable and predictable switching behavior, ensuring reliable machine operation

• Seamless SLC 500 integration, simplifying configuration and system expansion

FAQ

1. What types of loads can the 1746-OB16 module drive?
   The module is suitable for driving DC loads such as solenoids, relays, indicator lamps, and small actuators.

2. Is the 8 A rating applied per point or to the entire module?
   The 8 A rating refers to the total current capacity of the entire module.

3. What supply voltage is required for the output circuits?
   The module operates with a DC supply voltage in the range of 10–30 VDC.

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

5. Does the module provide isolation between outputs and the controller?
   Electrical isolation between the outputs and the backplane is provided to protect system electronics.

6. Can the module be used with inductive loads?
   Yes, it supports inductive DC loads when proper suppression methods are applied.

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

8. Is the module suitable for continuous operation?
   The 1746-OB16 is designed for continuous industrial duty in control cabinet environments.

9. How does the module handle switching transients?
   Solid-state output design helps ensure stable switching with minimal electrical disturbance.

10. Can the module be replaced without changing the control program?
    In most installations, the module can be replaced directly without requiring changes to the PLC program.

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