Product Overview

The Allen-Bradley 1769-OF8C delivers high-density analog control for CompactLogix (1768/1769) and MicroLogix 1500 controller series. This module provides eight high-resolution current output channels specifically engineered to drive modulating control valves, Variable Frequency Drives (VFDs), I/P transducers, and valve positioners. By utilizing a 16-bit Digital-to-Analog Converter (DAC), the 1769-OF8C enables extreme precision in PID control loops where minute signal adjustments determine system stability. We offer this unit as 100% Brand New original factory stock to ensure maximum accuracy in your critical automated processes.

Technical Specifications

Engineering Advantages

• High-Granularity PID Control: The 16-bit resolution translates to increments as small as 0.323 µA. This precision allows the controller to make ultra-fine adjustments to valve positions or motor speeds, reducing process oscillation and improving final product consistency.

• Rapid Signal Conversion: The module converts and updates all eight channels within 5 ms. This fast execution ensures that the physical field devices respond nearly instantaneously to logic changes in the processor, which is essential for high-speed pressure or flow regulation.

• Optimized Hardware Density: Packing eight current outputs into a single 1769 slot maximizes cabinet space. This high-density format reduces the number of expansion racks and communication adapters required for large-scale I/O deployments.

• Versatile Range Selection: Software-selectable ranges (0–20 mA or 4–20 mA) eliminate the need for physical jumpers. This allows engineers to reconfigure outputs on the fly for different field devices without opening the control panel or disturbing field wiring.

• Robust Load Drive Capability: The module drives loads up to 500 Ω, providing sufficient power for long-distance cable runs to field instruments located far from the main control cabinet without signal degradation.

FAQs

• Can the 1769-OF8C drive voltage-based actuators (e.g., 0-10V)?

  No. The 1769-OF8C is a dedicated current-sourced module (0-20mA/4-20mA). To drive voltage devices, you would require a module like the 1769-OF8V or use a precision resistor at the load, though a dedicated voltage module is recommended for accuracy.

• Does this module require an external 24V DC power source?

  The 1769-OF8C draws its operating power directly from the 1769 backplane (145 mA @ 5.1V and 185 mA @ 24V). You must ensure your system power supply (e.g., 1769-PA2 or 1769-PB4) has sufficient capacity to support the total current draw of all modules in the bank.

• Is the 1769-OF8C compatible with the MicroLogix 1500?

  Yes. The 1769 Compact I/O platform serves as the expansion I/O for the MicroLogix 1500 controller. The module connects directly to the right side of the processor or existing I/O modules.

• What is the significance of the "Power Supply Distance Rating"?

  The rating of 8 modules means the 1769-OF8C must reside within 8 slots of the system power supply. Placing it further away can result in excessive voltage drop across the backplane, potentially causing intermittent signal errors or module failure.