The Allen-Bradley 1771-OFE2/B is a high-performance analog output module designed for precise control in industrial automation systems. This module is part of the 1771 I/O series and is compatible with PLC-5 controllers, providing reliable and accurate analog signal outputs for various applications.
Key Features
- Four Individually Isolated Channels: Each channel operates independently, ensuring signal integrity and reducing the risk of interference between outputs.
- Output Signal Range: Delivers a standard 4-20 mA current output, suitable for controlling a wide range of industrial devices.
- High Resolution: Utilizes a 12-bit digital-to-analog converter, providing fine granularity and precise control over output signals.
- Rapid Update Rate: Offers a channel update time of 1.6 milliseconds for binary data, facilitating swift response in dynamic control environments.
- Robust Isolation: Each channel is electrically isolated, with a tested isolation voltage of 850 VDC for one second, enhancing system safety and reliability.
Technical Specifications
- Backplane Current Draw: 1.5 Amperes at 5 VDC.
- Power Dissipation: 7.9 Watts, ensuring efficient energy usage.
- Thermal Dissipation: 26.9 BTU/hr, maintaining optimal operating temperatures.
- Operating Temperature Range: 0°C to 60°C (32°F to 140°F), suitable for various industrial environments.
- Storage Temperature Range: -40°C to 85°C (-40°F to 185°F), allowing for flexible storage conditions.
- Humidity Tolerance: 5% to 95% non-condensing, accommodating diverse operational settings.
Installation and Compatibility
The 1771-OFE2/B module occupies a single slot in any 1771 I/O chassis and is compatible with PLC-5 controllers. It utilizes the 1771-WC field wiring arm, allowing for straightforward installation and maintenance. Proper module keying is essential, with keying bands set between pins 10 and 12, and 26 and 28, to ensure correct placement and operation.
Applications
This module is ideal for controlling final control elements such as variable frequency drives (VFDs), dampers, louvers, and valves. It is also suitable for transmitting signals to measuring and recording instruments like signal isolators, signal converters, panel meters, and data loggers. Its high resolution and rapid update rate make it well-suited for applications requiring precise and responsive analog control.
Diagnostic Features
The 1771-OFE2/B includes a self-check feature that runs at startup to detect faults. If a fault is identified, a red fault indicator LED illuminates, while the green power status LED remains off, providing clear visual diagnostics to operators.
In summary, the Allen-Bradley 1771-OFE2/B analog output module offers a reliable and precise solution for industrial analog control applications, combining high-resolution outputs, robust isolation, and user-friendly installation features.
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