Allen-Bradley 1769-OF8C Analog Output Module

The Allen-Bradley 1769-OF8C is an advanced analog output module designed to support industrial automation applications. It is part of the CompactLogix I/O series, offering eight output channels for precise current signal control. This module ensures reliability and accuracy, making it perfect for driving Final Control Elements (FCEs) such as control valves, positioners, and Variable Frequency Drives (VFDs).

Key Features

Eight output channels, configurable for 0-20 mA or 4-20 mA current output, providing flexibility for different applications.
16-bit Digital to Analog Converter (DAC), offering superior signal conversion accuracy and resolution.
Fast response time, with a 5 ms conversion rate and less than 2.9 ms step response time.
High accuracy at ±0.35% of full-scale output, ensuring precise signal delivery for critical operations.
Short-circuit and overcurrent protection safeguards the system, preventing damage to connected devices.
Status LED indicator provides clear diagnostics, allowing quick identification of potential issues.
No enclosure required, though additional protection is recommended for harsh environments.

Technical Specifications

Specification	Details
Manufacturer	Allen-Bradley
Module Type	Analog Output Module
Part Number	1769-OF8C
Number of Outputs	8 channels
Output Current Range	0-20 mA / 4-20 mA
Resolution	16-bit
Conversion Rate (max)	5 ms
Accuracy at 25°C	±0.35% full scale
Output Impedance	>1 Ohm
Short-Circuit Protection	Yes
Overcurrent Protection	Yes
Operating Temperature Range	0°C to 60°C (32°F to 140°F)
Current Draw	145 mA at 5V DC, 185 mA at 24V DC
Heat Dissipation	2.69 Watts
Wire Size	22-14 AWG (solid), 22-16 AWG (stranded)
Enclosure	None (requires external protection)
Module Dimensions	4.65 in x 1.38 in x 3.43 in
Weight	0.45 kg (1.00 lbs)
Power Supply	24V DC external
Connector Type	Removable terminal block
Communication Interface	8-point cable
Housing Type	Finger-safe, removable door
Mounting Type	Single-width, fits in CompactLogix or MicroLogix racks

Compatibility and Applications

The 1769-OF8C is compatible with 1769 and 1768 CompactLogix controllers, as well as the MicroLogix 1500 controller. This module is commonly used in systems where accurate and reliable analog current signals are essential. Some typical applications include driving control valves, positioners, and VFDs, as well as interfacing with panel meters, data loggers, and other measuring devices. Moreover, integrating this module with a PID controller within the processor helps optimize automated control systems.

Installation and Wiring

Installing the 1769-OF8C module is straightforward, with the added convenience of a removable terminal block for easy wiring. The terminal block features finger-safe protection to ensure safety during installation. For wiring, the module supports copper wire sizes from 22 to 14 AWG (solid) and 22 to 16 AWG (stranded). Additionally, the module’s status LED indicator will light green when the system operates correctly. If there’s an issue, the LED will signal a problem, such as an open-loop condition.

Although the module does not include a physical enclosure, it is designed for use in indoor environments. If the application requires exposure to harsh conditions, you should install the 1769-OF8C within a protective enclosure. This setup ensures continued performance without risking damage to the module.