Description

Product Overview

The Allen Bradley 1771-OFE1 is a high-performance analog voltage output module engineered for the PLC-5 platform. It provides four independent channels of high-resolution signal conversion to command field devices with extreme precision and speed.

High-Speed Signal Conversion

The 1771-OFE1 module utilizes a 12-bit Digital-to-Analog Converter (DAC) to translate digital processor data into precise analog voltage signals. Operators can configure each channel to operate within three distinct ranges: $1$ to $5$ V DC, $0$ to $10$ V DC, or $-10$ to $+10$ V DC. Because the module achieves a rapid settling time of 0.8 ms for resistive loads, it effectively manages high-speed process loops. Furthermore, the unit delivers impressive update rates, reaching 1.6 ms per channel for binary data, ensuring that control valves and drives receive nearly instantaneous command updates.

Robust System Integration and Protection

Rockwell Automation designed the 1771-OFE1 to withstand the electrical rigors of industrial environments. The module features optoelectrical isolation rated at 1500V, which shields the sensitive PLC backplane from field-side electrical noise and transients. Additionally, each output channel includes integrated overload protection. This safety feature proactively prevents hardware damage during short-circuit events or wiring errors. By drawing power directly from the 1771 chassis backplane (1.4A at 5V DC), the module eliminates the need for external power supplies, thereby simplifying enclosure wiring and reducing potential failure points.

Versatile Industrial Applications

This module serves as a critical interface for a variety of modulating equipment. It directly controls adjustable frequency drives, dampers, positioners, and modulating control valves. Beyond direct actuation, the 1771-OFE1 provides reliable reference signals for data loggers, panel meters, and secondary PID controllers. Its rugged construction allows for continuous operation in temperatures up to 60°C (140°F), making it a dependable choice for heavy manufacturing, chemical processing, and power generation facilities that utilize the legacy PLC-5 architecture.

Technical Specifications