Allen Bradley Analog Output Module 1771-OFE1 /B

Allen-Bradley 1771-OFE1/B Analog Output Module

The Allen-Bradley 1771-OFE1/B is a 4-channel analog output module designed for the PLC-5 series programmable logic controllers. It converts digital signals into precise analog voltage outputs, facilitating seamless integration with various analog devices.

Key Features

• Four Individually Isolated Outputs: Each channel is differentially isolated up to 1000V, ensuring signal integrity and protection against electrical interference.
• Selectable Voltage Ranges: The module supports three output voltage ranges:
  • +1 to +5 V DC
  • 0 to +10 V DC
  • -10 to +10 V DC

  This flexibility allows compatibility with a wide array of analog devices.

• High Resolution and Accuracy: With a 12-bit digital resolution, the module offers precise signal conversion. It maintains an accuracy of ±0.1% of full scale, with ±1/2 Least Significant Digit (LSD) in BCD mode and ±1/2 Least Significant Bit (LSB) in binary mode.
• Efficient Data Transfer: Utilizing block transfer programming, the module efficiently handles data exchange:
  • Block Transfer Write (BTW): Transfers up to 13 words from the processor to the module for digital-to-analog conversion.
  • Block Transfer Read (BTR): Retrieves up to 5 words from the module to the processor, facilitating diagnostics and monitoring.
• Rapid Response Time: The module boasts a converter settling time of 0.8 milliseconds for resistive loads, ensuring swift signal processing.
• Integrated Overload Protection: Each output channel is safeguarded against short-circuit conditions lasting up to one minute, enhancing system reliability.

Technical Specifications

• Power Requirements: Draws 1.5 A at 5 V DC from the I/O chassis backplane, eliminating the need for an external power supply.
• Power Dissipation: Maximum of 7.9 W.
• Thermal Dissipation: 26.9 BTU/hr.
• Operating Temperature Range: 0°C to 60°C (32°F to 140°F).
• Storage Temperature Range: -40°C to 85°C (-40°F to 185°F).
• Vibration Tolerance: 2 g at 10-500 Hz.
• Shock Tolerance: 30 g.

Installation and Compatibility

The 1771-OFE1/B module occupies a single slot in the 1771 I/O chassis and is compatible with various PLC-5 processors. It includes a wiring arm, allowing for module replacement without disconnecting field wiring, thereby minimizing downtime during maintenance.

Applications

This module is ideal for applications requiring precise analog voltage outputs, such as controlling valve positioners, motor speed controllers, signal converters, and recorders. Its high accuracy and reliability make it suitable for diverse industrial automation tasks.

For detailed installation instructions and configuration guidelines, refer to the official Allen-Bradley documentation.