Allen-Bradley 1769-OF4 CompactLogix Analog Output Module

Functional Performance

The Allen-Bradley 1769-OF4 serves as a high-precision analog output interface within the CompactLogix and MicroLogix 1500 controller families. By providing four independent voltage or current channels, this module enables the PLC to command external devices such as variable frequency drives (VFDs), control valves, and actuators. To ensure operational accuracy, the unit utilizes advanced 15-bit resolution to deliver fine-tuned adjustments to the field process. Furthermore, the module communicates directly over the 1769 Compact I/O bus, ensuring high-speed data synchronization and deterministic control for critical automation loops.

Operational Characteristics

• Maximizes Signal Versatility: Each of the four channels allows for individual configuration of voltage (±10V, 0–10V, 0–5V, 1–5V) or current (0–20mA, 4–20mA) ranges. As a result, engineers can interface with a wide variety of industrial hardware using a single module type.
• Enhances System Protection: The module incorporates comprehensive galvanic isolation between the backplane and the output channels. In doing so, it prevents electrical noise and ground loops from compromising the central processor’s stability.
• Simplifies Real-Time Monitoring: The 1769-OF4 performs continuous self-diagnostics and reports open-circuit or short-circuit faults back to the controller. Consequently, maintenance teams can identify field-side wiring issues immediately through the software interface.
• Streamlines Hardware Maintenance: Because the module supports a removable terminal block (RTB), technicians can replace the unit without disconnecting individual field wires. This feature effectively reduces downtime during routine hardware upgrades or emergency repairs.
• Optimizes Space Efficiency: The compact, rackless design allows for high-density mounting on a standard DIN rail. Therefore, it provides a robust I/O solution for space-constrained control cabinets without sacrificing industrial-grade performance.

Technical Specifications

• Catalog Number: 1769-OF4
• Product Series: Compact I/O
• Output Type: Analog (Voltage and Current)
• Number of Channels: 4 (Isolated from backplane)
• Resolution: 15 bits plus sign
• Voltage Ranges: ±10V, 0–10V, 0–5V, 1–5V
• Current Ranges: 0–20 mA, 4–20 mA
• Conversion Rate: 2.5 ms (Typical for all channels)
• Backplane Current: 120 mA at 5.1V / 120 mA at 24V
• Bus Current Draw: 2.9 W
• Operating Temperature: 0 °C to +60 °C
• Mounting: DIN Rail or Panel Mount