1715-TADOF8 Allen-Bradley Redundant Analog Output Base

Product Overview

The Allen-Bradley 1715-TADOF8 is a specialized Duplex Analog Output Termination Assembly (TA) within the Bulletin 1715 redundant I/O product line. This assembly provides the critical physical interface for 1715-OF8 analog output modules, enabling redundant, fault-tolerant configurations in mission-critical process automation. With a lightweight design of only 0.15 kg, it allows for high-density mounting without compromising cabinet structural integrity. By supporting duplex module mounting, this unit ensures that signal delivery to field actuators remains uninterrupted, even in the event of a single module failure.

Core Technical Advantages

This termination assembly is built to support high-availability control strategies. It manages an output range of 0 to 24 mA per channel, providing versatile control for valves, actuators, and other current-driven field devices. The hardware is designed for robust field-side performance, featuring shielded signal ports and a category 2 wiring rating to minimize electromagnetic interference. With its 500V AC isolation test rating and support for 18–32V DC field power, the assembly provides a stable and secure connection point between the control logic and the industrial process.

Technical Specifications

Installation & Engineering Guide

For successful deployment, the termination assembly must be mounted within a suitable protective enclosure, as it is an open-style component. Use copper wiring rated for at least 85°C (185°F) and ensure the screw terminals are torqued to exactly 0.5 N-m to maintain electrical contact under industrial vibration. Because this is a redundant duplex assembly, engineers should populate both module slots with 1715-OF8 units to achieve full fault tolerance. Ensure that shielded cables are used for all 8 channels to comply with Category 2 noise immunity standards.

Engineering Advantages

The system eliminates single points of failure at the I/O termination level. Its design allows for "Hot Swap" capability when used with redundant 1715-OF8 modules, meaning a faulty module can be replaced while the remaining module continues to drive the field process. This capability is essential for industries like oil and gas or power generation, where a signal interruption could lead to significant safety risks or financial losses. Its slim 4.2 cm width allows for high-density mounting in standard control cabinets.

Technical FAQs

Q1: What modules are compatible with this termination assembly?
A1: This unit is specifically designed to support two 1715-OF8 8-channel analog output modules in a redundant (duplex) configuration.

Q2: Does this unit provide isolation between individual output channels?
A2: No. While the assembly provides 50V continuous basic insulation between the system and field side, there is no electrical isolation between the eight individual output ports.

Q3: What is the significance of the "Duplex" designation?
A3: Duplex means the termination assembly has two slots for two identical I/O modules. Both modules work in parallel; if one fails, the other maintains the output signal to the field device without interruption.