Allen Bradley 1756-OX8I ControlLogix Digital Relay Output Module

Product Introduction

The Allen-Bradley 1756-OX8I is a ControlLogix digital relay output module engineered for applications requiring electrically isolated relay outputs, versatile voltage compatibility, and robust industrial performance. As part of the ControlLogix I/O family, this module provides reliable control of DC and AC devices while protecting the controller from electrical disturbances on the field side.

The 1756-OX8I features individually isolated channels, allowing flexible wiring of mixed-voltage devices in industrial automation systems. Its design supports both DC and AC loads, making it suitable for process control, factory automation, and systems that demand high reliability and flexibility.

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Product Specifications

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Applications

• Used for control of DC and AC devices such as solenoids, contactors, indicator lights, and small motors

• Suitable for industrial automation systems where electrical isolation is required between field devices and the controller

• Applied in process control, packaging, material handling, and assembly lines requiring flexible load control

• Commonly used in systems with mixed-voltage devices, thanks to individually isolated relay outputs

• Ideal for applications demanding high reliability, easy maintenance, and robust thermal management

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Advantages

• Individually isolated channels provide protection against electrical faults and allow flexible wiring of mixed loads

• Wide voltage compatibility (5–125 VDC / 125–240 VAC) supports a broad range of industrial devices

• Reliable mechanical relay outputs offer deterministic switching for both DC and AC applications

• Low power and thermal dissipation reduce cabinet heating and improve overall system longevity

• Seamless ControlLogix integration allows easy configuration, monitoring, and diagnostics

• Designed for stable operation in demanding industrial environments

FAQ

1. What types of loads can the 1756-OX8I drive?
   It can drive DC loads from 5–125 V and AC loads from 125–240 V, including solenoids, contactors, and indicator devices.

2. What is the benefit of individually isolated outputs?
   Isolation protects each channel from electrical faults and allows mixed-voltage connections without interference.

3. Can this module operate in high-density ControlLogix systems?
   Yes, it can coexist with other modules in a standard ControlLogix chassis.

4. How is output status monitored?
   Output status is communicated to the controller via the ControlLogix backplane for real-time monitoring.

5. What is the maximum power dissipation?
   The module dissipates a maximum of 3.1 W at 60 °C, with a thermal dissipation of 10.57 BTU/h.

6. Can the module operate in extreme temperatures?
   Yes, it operates from 0–60 °C and can withstand non-operating temperatures down to -40 °C.

7. How quickly can the relays switch?
   Mechanical relay switching speed is suitable for standard industrial digital output applications.

8. Can the module control mixed DC and AC devices simultaneously?
   Yes, each channel is independently isolated and can drive DC or AC loads concurrently.

9. What wiring considerations are important for relay outputs?
   Correct conductor sizing, polarity (for DC), and adherence to industrial wiring standards are essential.

10. Is this module suitable for safety-critical control systems?
    It is suitable for standard industrial applications, though additional safety measures may be required for SIL-rated systems.

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