Allen-Bradley 1769-OF8C CompactLogix Analog Current Output Module
Configured for precise signal generation in process control loops, the Allen-Bradley 1769-OF8C (1769-OF8C Analog Output Module) provides direct physical/electrical execution across CompactLogix and MicroLogix 1500 system platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-OF8C |
| Brand | Allen-Bradley / Rockwell Automation |
| Origin | USA / Multiple |
| Weight | 0.26 kg (0.56 lbs) |
| Dimensions | 35 mm x 118 mm x 87 mm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 2.69 W max heat dissipation |
| Bus Current Draw | 145 mA at 5.1 VDC, 180 mA at 24 VDC |
| Number of Outputs | 8 single-ended current channels |
| Output Current Ranges | 0 to 20 mA, 4 to 20 mA |
| Full Scale Range | 0 to 21 mA, 3.2 to 21 mA |
| Conversion Rate | <= 5 ms (all channels) |
| Resolution | 16-bit (0.323 uA/bit) |
| Load Impedance | Resistive 0 to 500 Ohms, Inductive <= 0.1 mH |
| Isolation Voltage | 500 VAC or 710 VDC for 1 min (30 V AC/DC continuous) |
| Slot Width | 1 Slot |
| Wire Size | 22 to 14 AWG solid, 22 to 16 AWG stranded |
Backplane Bus & Deterministic Network Execution
The module transfers command values across the 1769 Compact I/O backplane bus communication velocity framework, establishing deterministic signal updating for output channels. Internal logic maps controller registers directly to the 16-bit digital-to-analog converter, executing simultaneous signal updates across all 8 single-ended channels within 5 ms. System firmware flash compatibility guarantees real-time output synchronization while enforcing channel-to-backplane isolation under varying load conditions. The onboard drive circuits maintain output loop accuracy across backplane backplane spans during active I/O density scaling, continuously monitoring for open-circuit and short-circuit fault states.
Frequently Asked Questions
Q: What power supply distance rating restrictions apply when placing this module on a 1769 backplane?
A: You must mount the module within 8 slot locations of the 1769 system power supply. Exceeding an 8-module power supply distance rating causes backplane voltage drops that can degrade current drive performance or disrupt module communications.
Q: What external power supply requirements are necessary to operate the analog output circuits?
A: The module requires an external Class 2 24 VDC power supply delivering 20.4 to 26.4 VDC. This external field power feeds the current loops while drawing 180 mA under full load conditions.
Field Installation Guidelines
Mount the unit on an IEC standard DIN rail or attach it securely to an enclosure panel backplate using M4 screws. Confirm that the ambient operating temperature inside the cabinet stays within 0 to 60 deg C during operation.
Connect field wiring using copper conductors rated for 90 deg C. Secure solid (22 to 14 AWG) or stranded (22 to 16 AWG) wires into the terminal block screws, tightening to a torque specification of 0.68 N m (6 lb in). Ensure load loop resistance stays under 500 Ohms per channel to maintain proper loop regulation.
Route current loop cables in dedicated raceways separated from high-voltage AC feeds and variable frequency drive output cables. Connect cable shielding to a single earth ground point on the cabinet chassis to shield analog signals from electromagnetic noise.
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| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
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