8-Point Analog Current Output Module | 1769-OF8C Allen-Bradley
Manufacturer: Allen Bradley
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Part Number: 1769-OF8C
Condition：New with Original Package
Product Type: Analog Output Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Allen-Bradley 1769-OF8C CompactLogix Analog Output Module
The Allen-Bradley 1769-OF8C, also cataloged as the 1769-OF8C analog output module, operates as a dedicated hardware component for industrial automation control loops within CompactLogix network platforms. The module provides 8 single-ended current channels configured to drive final control elements such as control valves, variable frequency drives, and actuators. Operating via the 1769 system bus, the module converts digital controller arrays into continuous 0-20 mA or 4-20 mA current signals, utilizing physical hardware paths to maintain deterministic electrical execution under factory-calibrated accuracy parameters.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-OF8C |
| Brand | Allen-Bradley |
| Origin | Standard Factory Sourced |
| Weight | 0.62 lbs (281 g) |
| Dimensions | 118 x 35 x 87 mm |
| Operating Temp | 0 deg C to 60 deg C |
| Power Consumption | 145 mA at 5 VDC, 140-185 mA at 24 VDC |
| Output Channels | 8 single-ended current channels |
| Output Signal Ranges | 0-20 mA, 4-20 mA |
| Full Scale Range | 0-21 mA, 3.2-21 mA |
| Resolution | 16-bit (0.323 uA/bit) |
| Conversion Rate | Max 5 ms (all channels) |
| Step Response | Less than 2.9 ms to 63 percent output |
| Accuracy | +/-0.35 percent full scale at 25 deg C |
| Isolation Voltage | 500 VAC or 710 VDC for 1 min |
| Maximum Load Limits | Resistive load up to 500 ohm, inductive load max 0.1 mH |
| Heat Dissipation | 2.69 W |
| Enclosure Type | Open |
Backplane Bus Communication Velocity and Deterministic Networks
The module interfaces with the CompactLogix backplane assembly to sustain the backplane bus communication velocity necessary for high-density analog loops. To minimize data lag within EtherNet/IP deterministic networks, the hardware runs a 16-bit digital-to-analog converter (DAC) that provides a fast conversion rate of max 5 ms across all 8 active channels simultaneously. The single-slot module relies on its physical system bus connection to transfer diagnostic status arrays—including open-wire faults, high load resistance anomalies, and over/under-range metrics—back to the master controller block. System layout designers must evaluate firmware flash compatibility constraints to verify that the 8-channel array mapping aligns correctly across CompactLogix 1768/1769 or MicroLogix 1500 controller profiles.
Frequently Asked Questions
Q: Can this analog current output module be hot-swapped while the local chassis is energized?
A: No. The 1769 Compact I/O hardware platform does not support Removal and Insertion Under Power (RIUP). Attempting to remove or insert the module while backplane power is active can damage the internal digital isolation circuits and cause a major fault on the host processor.
Q: Does the module support manual adjustments or field calibration sequences if accuracy drifts?
A: No field calibration option exists for this hardware component. The 16-bit resolution accuracy parameters are permanently set at the factory. Technicians must address temperature-induced drift variations (+/-0.0058 percent per deg C) using programmatic compensation within the host controller logic application if needed.
Field Installation Guidelines
- Bus Attachment and Interlock Integration: Slide the module into position alongside the adjacent 1769 component by aligning the built-in tongue-and-groove side guides. Push the upper and lower bus levers forward to engage the electrical backplane connections. Ensure the locking mechanisms engage completely before applying utility power.
- DIN-Rail Assembly and Panel Mounting: Install the open enclosure hardware inside a protective electrical enclosure that limits exposure to dust, static discharge, and UV radiation. Mount the unit directly to an EN 50022 compliant 35 mm DIN rail or bolt it to the panel sub-plate using the pull-out tabs.
- Current Loop Shielding and Routing: Run all 4-20 mA signal runs using high-quality shielded twisted-pair copper wire. Route analog signal pathways away from high-voltage AC cables or motor supply lines to eliminate inductive cross-talk. Terminate the cable shield at a single structural earth ground point inside the local marshalling cabinet.