Allen-Bradley 1715-TASOF8 Ruggedized Redundant Analog Output Module

Product Overview

Allen-Bradley 1715-TASOF8 Ruggedized Redundant Analog Output Module for Harsh Environments

The Allen-Bradley 1715-TASOF8 is an 8-channel redundant analog output module engineered for the ControlLogix 1715 Redundant I/O platform. Designed to sustain continuous, fault-tolerant operation in the most demanding industrial environments — including high-temperature process plants, high-humidity coastal facilities, dust-laden mining sites, high-vibration heavy machinery floors, and electromagnetically noisy power generation stations — this module delivers the signal integrity and system resilience that mission-critical automation demands.

Built on Rockwell Automation’s proven 1715 architecture, the 1715-TASOF8 provides true hardware redundancy at the I/O level. Each output channel is backed by a redundant signal path, ensuring that a single-point hardware failure does not interrupt the analog control loop. This is essential in continuous production lines where even a momentary output interruption can trigger costly process upsets, safety shutdowns, or equipment damage. The module communicates over the EtherNet/IP backplane, maintaining deterministic, low-latency data exchange with the ControlLogix L7x or L8x redundant controller chassis.

Rugged Specifications Table

Comprehensive Protection Solutions

The 1715-TASOF8 does not operate in isolation — it is the analog output backbone of a fully redundant control architecture. In a typical high-availability control cabinet, it works in concert with the 1715-AENTR EtherNet/IP Redundant Adapter, which manages the dual-ring network path between the I/O chassis and the redundant ControlLogix controller pair. The controller chassis typically houses a 1756-L73S or 1756-L83ES GuardLogix Safety CPU, providing integrated safety logic alongside standard process control — eliminating the need for a separate safety PLC in many SIL 2 applications.

On the input side, the 1715-TASOF8 is commonly paired with the 1715-TASIF8 redundant analog input module, forming a complete closed-loop control pair for critical process variables such as flow, pressure, temperature, and level. For discrete safety interlocks, the 1715-TBSH redundant digital input module and 1715-TBOF8 redundant digital output module round out the I/O complement within the same 1715 chassis.

Power integrity is maintained by a redundant 24 VDC industrial power supply — typically a 1606-XLP95E or equivalent Rockwell-compatible DIN-rail PSU — feeding the 1715 I/O chassis through a power distribution terminal block. Surge and transient protection is provided by 1492-XTBG series terminal blocks with integrated ground bus, ensuring that voltage spikes from motor starters, variable frequency drives (VFDs), or switching contactors do not propagate into the analog signal wiring.

For facilities running Profibus DP or HART field devices alongside EtherNet/IP, a 1788-EN2PAR EtherNet/IP-to-Profibus linking device or a HART multiplexer can be integrated upstream, allowing the 1715-TASOF8 to serve as the final analog output stage for HART-addressable field instruments such as control valves, positioners, and smart transmitters. This makes the module a versatile fit for both greenfield DCS migration projects and brownfield PLC upgrade programs.

Application in Critical Infrastructure

The 1715-TASOF8 is deployed across the most demanding sectors of critical infrastructure, where analog output reliability is non-negotiable:

Oil & Gas: In upstream wellhead automation and midstream pipeline compression stations, the module drives control valve positioners and variable-speed pump drives with the precision and redundancy required by IEC 61511 functional safety standards. Its hot-swap capability allows maintenance teams to replace a faulted module without halting the production process — a critical advantage in remote or offshore installations where downtime costs are measured in thousands of dollars per hour.

Power Generation: In coal-fired, gas turbine, and hydroelectric power plants, the 1715-TASOF8 manages analog setpoints for turbine governor controls, boiler feedwater flow regulation, and excitation system references. Its EMI hardening ensures stable signal output even in the presence of high-voltage bus switching transients and large rotating machinery.

Mining & Minerals Processing: Flotation cell level control, conveyor speed regulation, and crusher load management all rely on stable 4–20 mA output signals. In dusty, high-vibration mining environments, the module’s robust construction and redundant architecture prevent the signal drift and module failures that plague standard I/O in these conditions.

Water & Wastewater Treatment: Municipal water treatment facilities use the 1715-TASOF8 to control chemical dosing pumps, aeration blowers, and UV disinfection systems. Redundancy ensures that a module fault does not result in under- or over-dosing — a critical public health safeguard.

Metallurgy & Steel: In electric arc furnace (EAF) and continuous casting operations, the module provides precise analog control of electrode positioning, cooling water flow, and mold oscillation — all in environments characterized by extreme heat, electromagnetic interference, and mechanical vibration.

Security & Quality FAQ

Q1: What warranty does TOPNLMS provide for the 1715-TASOF8?
All 1715-TASOF8 units supplied by TOPNLMS carry a 12-month warranty from the date of shipment. Each unit undergoes functional testing and visual inspection prior to dispatch. If a module fails under normal operating conditions within the warranty period, we provide a replacement or full refund — no questions asked.

Q2: How is the module tested before shipment?
Every 1715-TASOF8 is bench-tested for channel-by-channel analog output accuracy, redundancy switchover function, and backplane communication integrity before packaging. Units sourced from authorized distribution channels are verified against Rockwell Automation’s original firmware and hardware revision records. Test reports are available upon request for quality-critical procurement.

Q3: Is the 1715-TASOF8 compatible with my existing ControlLogix system?
The 1715-TASOF8 is designed exclusively for the 1715 Redundant I/O platform and requires a 1715-AENTR adapter and a compatible ControlLogix redundant controller (L7x or L8x series). It is not compatible with standard 1756 ControlLogix I/O chassis. If you are unsure about compatibility with your existing system architecture, contact our technical team with your controller catalog number and firmware revision for a pre-sale compatibility check.

Q4: Can TOPNLMS support long-term supply and emergency replacement needs?
Yes. TOPNLMS maintains buffer stock of high-demand 1715 series modules to support both planned maintenance schedules and emergency breakdown replacements. We ship globally with DHL Express, FedEx International Priority, and UCP freight options. For critical infrastructure customers, we offer priority fulfillment agreements to guarantee module availability within agreed lead times — contact us to discuss your site’s spare parts strategy.