The Allen-Bradley 1771-OFE2 Series B Analog Output Module is a high-performance component designed to deliver precise current signals for industrial automation applications. As part of the 1771 I/O series, this module integrates seamlessly into Allen-Bradley PLC-5 systems, providing reliable and accurate control over various processes. Key Features Four Individually Isolated Channels: Each of the four output channels operates independently, ensuring signal integrity and minimizing interference. 4-20 mA Output Range: The module delivers a standard 4-20 mA current output, suitable for controlling a wide array of industrial devices. 12-Bit Resolution: High-resolution digital-to-analog conversion allows for precise control over output signals. Single-Slot Design: Occupies a single slot in the 1771 I/O chassis, optimizing space within the control system. Compatibility: Fully compatible with Allen-Bradley PLC-5 processors and 1771 series I/O chassis. Technical Specifications Output Channels: 4 individually isolated channels Output Signal Range: 4-20 mA Digital Resolution: 12-bit binary Backplane Current Draw: 1.5 A at 5V DC Power Dissipation: 7.9 Watts Thermal Dissipation: 26.9 BTU/hr Isolation Voltage: 850 VDC for 1 second per channel Operating Temperature Range: 0°C to 60°C (32°F to 140°F) Certifications: UL, CE, CSA approved for industrial use Applications The 1771-OFE2 B module is ideal for various industrial applications, including: Process control systems requiring precise current loop outputs Motor speed regulation and actuator positioning Integration with Variable Frequency Drives (VFDs), dampers, louvers, and valves Installation and Compatibility The 1771-OFE2 is designed for seamless integration into any 1771 I/O chassis, occupying a single slot. It utilizes the 1771-WC field wiring arm, facilitating straightforward installation and maintenance. Each channel has an isolation rating of 850 VDC for 1 second, ensuring robust protection against electrical disturbances. The module’s digital-to-analog converter (DAC) settling time is up to 0.8 milliseconds, providing rapid response for dynamic control applications. For wiring, it is recommended to use 12-gauge stranded or solid wire with an insulation thickness of 3/64 inch (1.2 mm), such as Belden 8761 cable. During installation, ensure that the module keying is set between 10 and 12, and between 26 and 28, to secure the module in the chassis. Tighten wire terminations with a force of 7-9 inch-pounds to maintain reliable connections. The 1771-OFE2 module is compatible with Allen-Bradley PLC-5 processors and 1771 series I/O chassis, making it a versatile choice for expanding or upgrading existing control systems. Diagnostic Features The module includes diagnostic capabilities to ensure reliable operation. It performs a self-test at startup, and if a fault is detected, the red fault indicator LED will illuminate, while the green power status indicator LED will remain off. This feature aids in quick identification and resolution of issues, minimizing downtime in critical industrial processes. In summary, the Allen-Bradley 1771-OFE2 Series B Analog Output Module offers precise control, robust isolation, and seamless integration, making it a valuable component for a wide range of industrial automation applications.