Allen-Bradley 1715-TASOF8 Safety Redundant Analog Output Module

Allen-Bradley 1715-TASOF8 Safety Redundant Analog Output Module: Reliable Control in Harsh Industrial Sites

The Allen-Bradley 1715-TASOF8 is a safety-enhanced, redundant analog output module engineered for mission-critical industrial control environments where signal integrity, continuous availability, and functional safety are non-negotiable. Designed as part of the Rockwell Automation ControlLogix 1715 Redundant I/O System, this 8-channel module delivers fault-tolerant 4–20 mA analog output with hardware redundancy at the module level — ensuring that a single point of failure never interrupts your process control loop.

In high-load, high-interference production environments — including petrochemical plants, power generation facilities, mining operations, water treatment systems, metallurgical furnaces, and continuous manufacturing lines — the 1715-TASOF8 provides the output stability and diagnostic depth that safety instrumented systems (SIS) demand. Its dual-module redundancy architecture allows seamless bumpless transfer between primary and secondary output modules, eliminating the risk of control interruption during module faults, firmware updates, or scheduled maintenance windows.

Safety Reliability Table

Control Cabinet Protection Strategy

Deploying the 1715-TASOF8 within a redundant control cabinet demands a carefully coordinated protection architecture. The module pairs directly with the Allen-Bradley 1715-AENTR EtherNet/IP Adapter, which provides the redundant network interface between the I/O chassis and the ControlLogix controller backplane. For controller-level redundancy, the 1715-TASOF8 is typically paired with a ControlLogix 1756-L73 or 1756-L83E controller running in a primary/secondary redundancy configuration managed by the 1756-RM2 Redundancy Module.

On the power side, the 1715 I/O chassis is fed by a dedicated 1715-PS4 Power Supply, and best practice in safety-critical cabinets calls for dual power feeds with automatic switchover — often supported by a 1756-PA75R redundant power supply at the controller chassis level. Surge protection on incoming 24 VDC field power lines, using DIN-rail mounted surge protective devices (SPDs) rated to IEC 61643-11, is strongly recommended to guard against transient overvoltage events that could cause module misoperation or output signal drift.

For field signal integrity, each 4–20 mA output channel should be wired through shielded twisted-pair cable with proper grounding at a single point to suppress common-mode interference from variable frequency drives (VFDs), high-voltage bus bars, and inductive loads common in heavy industrial environments. The 1715-TASOF8’s built-in open-wire detection and channel-level diagnostics continuously monitor output loop integrity, feeding fault data back to the Studio 5000 Logix Designer HMI for operator awareness.

In safety instrumented system (SIS) architectures, the 1715-TASOF8 analog outputs may drive final control elements such as smart positioners, I/P converters, or electro-hydraulic actuators within a safety instrumented function (SIF). These outputs are often cross-validated against Allen-Bradley 1715-TASIF8 redundant analog input modules reading process feedback, creating a closed-loop verification layer that supports SIL 2 proof-test intervals. Communication health across the EtherNet/IP network is monitored via the 1715-AENTR adapter’s built-in diagnostics, with network switch redundancy provided by managed industrial Ethernet switches supporting RSTP or DLR ring topology.

Critical Industrial Safety Applications

Petrochemical & Refinery Plants: In continuous distillation columns, reactor temperature control loops, and pressure relief valve positioning systems, the 1715-TASOF8 provides the bumpless redundant output required to maintain precise setpoint control without process upset. A single analog output channel failure in these environments can trigger emergency shutdowns costing hundreds of thousands of dollars per hour — the 1715-TASOF8’s hardware redundancy eliminates this single point of failure.

Power Generation & Utilities: Turbine governor control, boiler feedwater flow regulation, and generator excitation systems rely on stable, drift-free 4–20 mA signals. The 1715-TASOF8’s 16-bit resolution and channel-level diagnostics ensure that output signals remain within calibrated tolerance even under the electromagnetic interference generated by large rotating machinery and high-voltage switchgear.

Mining & Mineral Processing: Conveyor speed control, flotation cell reagent dosing, and crusher load management in underground and open-pit mining operations expose control hardware to extreme vibration, dust ingress, and wide temperature swings. The 1715-TASOF8’s robust construction and IEC 60068-compliant environmental ratings make it a reliable choice for these demanding conditions.

Water & Wastewater Treatment: Chemical dosing pumps, aeration blower speed control, and sludge dewatering press control require continuous, uninterrupted analog output signals. Municipal water authorities and industrial effluent treatment facilities use the 1715-TASOF8 in critical interlock loops where output module failure could result in regulatory non-compliance or environmental incidents.

Metallurgy & Steel Production: Electric arc furnace electrode positioning, rolling mill tension control, and continuous casting mold level control demand sub-millisecond response and absolute output reliability. The 1715-TASOF8’s redundant architecture and fast bumpless transfer capability meet the stringent demands of these high-value, high-risk production processes.

Port & Heavy Logistics Automation: Ship-to-shore crane hoist control, automated stacking crane positioning, and conveyor speed regulation in bulk material handling terminals benefit from the 1715-TASOF8’s ability to maintain precise analog output control even in the presence of heavy electrical noise from large drive systems and outdoor environmental exposure.

Safety and Quality FAQ

Q1: What does the 12-month warranty cover for the 1715-TASOF8?
The 12-month warranty covers all manufacturing defects, component failures, and functional non-conformance under normal operating conditions. If the module fails to perform to its published specifications within the warranty period, we provide replacement or repair at no additional cost. Warranty claims are processed with priority to minimize your site downtime.

Q2: What pre-shipment testing is performed on the 1715-TASOF8?
Every 1715-TASOF8 unit undergoes functional verification testing prior to shipment, including power-on self-test, channel output accuracy verification across the 4–20 mA range, communication interface check with the 1715 adapter, and visual inspection for physical integrity. Units are shipped in anti-static packaging with individual test records available upon request.

Q3: Is the 1715-TASOF8 compatible with my existing ControlLogix 1756 system?
The 1715-TASOF8 is specifically designed for the ControlLogix 1715 Redundant I/O platform and requires a 1715 I/O chassis and 1715-AENTR adapter. It is not directly interchangeable with standard 1756 analog output modules. However, it integrates seamlessly with ControlLogix 5570 and 5580 controllers running Studio 5000 Logix Designer v21 or later, making it fully compatible with modern ControlLogix redundancy systems.

Q4: Can you guarantee long-term supply and replacement support for the 1715-TASOF8?
Yes. We maintain dedicated stock of the 1715-TASOF8 and related 1715 series components to support both new project deployments and ongoing spare parts programs. Our inventory is sourced from authorized distribution channels and verified for authenticity. For customers with critical infrastructure requirements, we offer reserved stock arrangements and expedited shipping to minimize lead times during unplanned outages.

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