Allen-Bradley 1715-OF8I 8-Point Analog Output Module

Description

Allen-Bradley 1715-OF8I 8-Point Analog Output Module

Product Dimensions：

The Allen-Bradley 1715-OF8I is a high-availability 8-Channel Analog Isolated Output Module belonging to the 1715 Redundant I/O family. It is specifically engineered for critical control applications where system uptime and fault tolerance are paramount.

Product Detailed Description

The 1715-OF8I provides eight channels of isolated analog outputs, typically used to control actuators, valves, or motor drives. As part of the 1715 series, this module is designed to be used in a Redundant Configuration. When paired with a second 1715-OF8I in a redundant adapter base, the system ensures that even if one module fails, the analog output signal to the field remains stable and uninterrupted.

Technical Parameters

Product Advantages

• Fault Tolerance: Supports true “Hot-Repair” redundancy. You can replace a failed module while the partner module continues to drive the field process without a bump in the signal.
• Individual Channel Isolation: Each of the 8 channels is galvanically isolated from the others. This prevents a ground loop or electrical fault on one field device from affecting the other seven channels.
• Diagnostic Sophistication: The module provides extensive “Echo” diagnostics, where it monitors the actual current flowing in the loop and compares it to the commanded value to ensure the output is correct.
• Ruggedized Design: Rated for harsh industrial environments, including extreme temperatures and vibration, making it more durable than standard commercial I/O.

Important Considerations & Precautions

• Base Requirement: This module must be installed in a 1715-TADOF8 (Analog Output Terminal Assembly). It cannot be plugged into standard 1756 or 1769 chassis.
• Load Impedance: Ensure the total resistance of the field device and wiring does not exceed the maximum load impedance (typically 500 to 750 ohms depending on supply voltage) to maintain the 4-20 mA loop.
• Firmware Matching: In a redundant pair, both 1715-OF8I modules must have the identical firmware revision to synchronize correctly.
• Heat Dissipation: When mounting multiple redundant racks, ensure proper cabinet ventilation as the dual-module configuration generates more heat than a simplex system.

Product Applications

The 1715-OF8I is primarily found in “No-Fail” industrial sectors:

• Oil & Gas: Controlling critical flow valves on offshore platforms where a signal loss could lead to an emergency shutdown.
• Power Generation: Regulating fuel or steam valves in turbines where precise, uninterrupted control is required for grid stability.
• Chemical Processing: Managing exothermic reactions where the cooling or feed-rate actuators must never lose their command signal.
• Emergency Systems: Driving critical indicators or modulating dampers in life-safety ventilation systems.

Shipping Port: Xiamen, China

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