Allen Bradley 1756-OF8IK ControlLogix 8-Channel Isolated Analog Output Module

Product Overview

The Allen Bradley 1756-OF8IK functions as a high-performance, isolated analog output module for the ControlLogix platform. It provides eight independent current output channels to drive field devices such as actuators, valves, and motor controllers. This specific model features factory-applied conformal coating (indicated by the "K" suffix), which provides essential protection against corrosive atmospheres and humidity. By utilizing channel-to-channel isolation, the 1756-OF8IK eliminates ground loop interference and ensures high-integrity signal delivery in complex industrial environments.

Technical Specifications

Engineering Advantages

• Channel-to-Channel Isolation: The 1756-OF8IK isolates each of its eight outputs individually. This prevents electrical noise and ground loops from propagating between loops, solving common signal distortion issues in large-scale facilities where field devices reside at different potential levels.

• Conformal Coating for Harsh Service: The "K" version includes a specialized protective layer over the internal circuitry. This barrier resists chemical vapors, salt spray, and moisture, making this module the mandatory choice for wastewater treatment, oil and gas, and chemical processing plants.

• High-Resolution Control: The 15-bit digital-to-analog converter ensures granular control over current loops. This precision allows the PLC to modulate control valves with extreme accuracy, optimizing process efficiency and reducing mechanical wear caused by "stepped" movements.

• Robust Fault Containment: Channel isolation ensures that a short circuit or electrical fault on one field device does not impact the remaining seven channels. This containment strategy minimizes system downtime and protects the overall integrity of the ControlLogix chassis.

• Simplified Maintenance: The module utilizes standard 1756-TBNH or 1756-TBSH terminal blocks. Maintenance teams can replace the module without disconnecting field wires, significantly reducing the Mean Time to Repair (MTTR) during critical hardware swaps.

FAQs

• Is the 1756-OF8IK 100% Brand New?

  Yes. We supply this module as 100% Brand New in original factory-sealed packaging. This ensures the conformal coating is fully intact and the hardware meets the latest OEM specifications.

• Can the 1756-OF8IK drive voltage loads?

  This specific model is optimized for current outputs (0–20mA or 4–20mA). For applications requiring ±10V voltage outputs, we recommend selecting the 1756-OF8 or the isolated 1756-OF6VI models.

• Does the module require an external power supply?

  Yes, the module draws 400 mA at 24V DC from the backplane or an external user-supplied 24V source to power the isolated current loops. Ensure your chassis power supply has sufficient headroom for the 6.5W dissipation.

• What is the difference between 1756-OF8I and 1756-OF8IK?

  The "K" suffix in 1756-OF8IK indicates the addition of conformal coating. Both modules share identical electrical performance, but the "K" model provides superior resistance to environmental corrosion.