Allen Bradley 1771-OFE2 Series B Analog Output Module

Allen-Bradley 1771-OFE2 Series B Analog Output Module

The Allen-Bradley 1771-OFE2 Series B Analog Output Module is a versatile component designed to provide precise analog control within industrial automation systems. This module is part of the 1771 I/O series and is compatible with PLC-5 controllers, offering reliable performance for various applications.

Key Features

• Number of Outputs: Four (4) individually isolated analog output channels.
• Output Signal: Each channel delivers a 4-20 mA current output, suitable for controlling devices such as variable frequency drives (VFDs), dampers, louvers, and valves.
• Digital Resolution: 12-bit binary, ensuring accurate signal representation.
• Isolation: Each channel is isolated with a rating of 1000 Volts, enhancing system safety and reliability.
• Backplane Current: Draws 1.4 Amperes at 5 VDC from the I/O chassis backplane, eliminating the need for an external power supply.
• Power Dissipation: Maximum of 7.9 Watts, with a thermal dissipation of 26.9 BTU/hr.
• Module Width: Occupies a single slot in the 1771 I/O chassis, optimizing space utilization.
• Field Wiring Arm: Utilizes the 1771-WC wiring arm, facilitating easy installation and maintenance.

Applications

The 1771-OFE2 module is ideal for:

• Controlling final control elements such as VFDs, dampers, and valves.
• Implementing outputs for Proportional-Integral-Derivative (PID) controllers in automatic control loops.
• Transmitting signals to measuring, receiving, and recording instruments like signal isolators, converters, panel meters, and data loggers.

Installation and Wiring

For optimal performance and safety:

• Install the module in any slot of the 1771 I/O chassis, ensuring proper keying between pins 10 and 12, and 26 and 28.
• Use 12-gauge stranded or solid wire with an insulation thickness of 3/64 inch (1.2 mm) for field wiring. Belden 8761 cable is recommended.
• Secure wire terminations with a torque of 7-9 inch-pounds to maintain reliable connections.

Technical Specifications

• Channel Update Time: 8 milliseconds per 4 channels for BCD format; 1.6 milliseconds per 4 channels for Natural Binary format.
• DAC Settling Time: Maximum of 0.8 milliseconds, ensuring rapid response to control signals.
• Operating Temperature: 0 to 60 degrees Celsius, suitable for various industrial environments.
• Storage Temperature: -40 to 85 degrees Celsius, allowing for flexible storage conditions.

The Allen-Bradley 1771-OFE2 Series B Analog Output Module stands as a reliable solution for precise analog control in industrial automation, offering robust features and flexible applications to meet diverse operational needs.