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The 1769-OF8C (Part Number: 1769-OF8C) is a high-density current output expansion module designed for the Allen-Bradley CompactLogix (1768 and 1769) and MicroLogix 1500 controller platforms. This module provides eight single-ended channels, making it a critical component for...
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The 1769-OF8C (Part Number: 1769-OF8C) is a high-density current output expansion module designed for the Allen-Bradley CompactLogix (1768 and 1769) and MicroLogix 1500 controller platforms. This module provides eight single-ended channels, making it a critical component for driving Final Control Elements (FCE) such as modulating valves, actuators, and variable speed drives. Its ability to convert 16-bit digital data into precise analog current signals ensures smooth and accurate process control.
Engineered for performance, the 1769-OF8C features a rapid conversion rate of 5 milliseconds across all channels, ensuring that control loops respond quickly to setpoint changes. The module is fully software-configurable, allowing users to define output ranges and fault-state behaviors through the programming environment. With its high resolution and robust electrical isolation, it maintains signal integrity even in demanding industrial environments.
| Specification | Details |
|---|---|
| Digital to Analog Converter (DAC) | 16-bit resolution |
| Effective Resolution | 15.59 bits (4–20 mA) and 15.91 bits (0–20 mA) at 0.323 µA/bit |
| Conversion Rate | 5 ms for all 8 channels |
| Step Response | < 2.9 ms to 63% of output value |
| Accuracy Drift with Temp | ±0.008% of full scale per °C |
| Backplane Current Load | 145 mA at 5.1V DC; 185 mA at 24V DC |
| Power Consumption | 5.2 Watts maximum |
| Thermal Dissipation | 3.0 Watts |
| Load Impedance | 0 to 500 Ω |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
The 1769-OF8C is ideally suited for centralized process control in industries like:
Water treatment systems
Chemical batching
HVAC systems
Its 8-point density is perfect for applications requiring the simultaneous modulation of multiple proportional valves or the transmission of synchronized current signals to data loggers and recorders.
Does the 1769-OF8C support voltage output?
No, the 1769-OF8C is strictly a current output module. If your application requires 0–10V or ±10V signals, consider the 1769-OF8V or 1769-OF4 modules instead.
What happens to the outputs if the controller loses communication?
The module can be configured to either "Hold Last State" or go to a specific "Safe State" (e.g., 4mA or 0mA) in the event of a controller fault or communication loss, ensuring the safety of the connected hardware.
