Allen Bradley 1771-OFE1 Analog Output Module

The Allen-Bradley 1771-OFE1 provides high-resolution voltage signaling for complex industrial automation tasks. This module converts digital data from the PLC-5 processor into precise analog output signals. It effectively controls external devices such as variable frequency drives, modulating valves, and industrial dampers. Furthermore, the 1771-OFE1 serves as an accurate signal source for data loggers and panel meters. The single-slot design allows for easy integration into any standard 1771 I/O chassis.

The hardware utilizes a 12-bit Digital-to-Analog Converter (DAC) to ensure superior signal linearity. Technicians can choose from three distinct voltage ranges to meet specific application requirements. These ranges include 1 to 5V DC, 0 to 10V DC, and -10 to +10V DC. Consequently, the module adapts to various international instrument standards with minimal configuration effort.

Primary Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• Model Number: 1771-OFE1
• Product Type: Analog Voltage Output Module
• Resolution: 12-Bit Digital-to-Analog Conversion
• Output Ranges: 1-5V DC, 0-10V DC, ±10V DC
• Settling Time: 0.8 ms (Resistive Loads)
• Backplane Current: 1.4 Amps @ 5V DC
• Power Dissipation: 7.9 Watts (Maximum)
• Thermal Dissipation: 26.9 BTU/hr
• Isolation Voltage: 1500V AC (Optoelectrical)
• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Dimensions: 2.9 x 19.3 x 25.4 cm
• Weight: 0.6 kg

Advanced Signal Processing and Speed

This module offers rapid data updates to maintain high system throughput. It processes binary data in just 1.6 ms per channel without scaling. If the application requires BCD data with scaling, the scan rate adjusts to 8 ms. This flexibility allows engineers to optimize the module for either speed or ease of programming. Additionally, the 1771-OFE1 includes short-circuit protection on every output channel. This protection prevents hardware damage during field wiring faults or equipment failures.

The 1771-OFE1 also emphasizes electrical safety through 1500V optoelectrical isolation. This barrier protects the PLC backplane from electrical noise and field-side surges. Furthermore, the module performs continuous self-diagnostic checks during operation. If a fault occurs, the front-panel LED indicators provide immediate visual feedback. These features enhance overall system reliability in high-availability manufacturing environments.