1715-A3IO | Allen Bradley | Redundant I/O System 3-Slot Base Unit

Product Overview

The Allen Bradley 1715-A3IO serves as the structural and electrical foundation for the 1715 Redundant I/O system. This 3-slot base unit facilitates high-availability configurations by providing the necessary backplane connections for redundant I/O modules. It enables mission-critical systems to maintain continuous operation during module swaps or internal faults. We supply this unit as 100% Brand New and factory-original, ensuring your safety-critical or high-availability control loops meet the most stringent industrial standards.

Technical Specifications

The 1715-A3IO manages power distribution and signal routing across three dedicated I/O slots with the following technical parameters:

Engineering Advantages

• Facilitates Hot Swapping: The 1715-A3IO design supports the removal and insertion of modules under power (RIUP). This allows technicians to replace faulty modules without interrupting the field signal or shutting down the process, effectively eliminating production downtime.

• High Thermal Resilience: Carrying a T4 temperature code, this base unit operates safely in hazardous environments where surface temperature control remains critical. The open-style enclosure design promotes natural convection to manage heat during high-density I/O operations.

• Optimized Signal Integrity: The unit features built-in isolation (50V continuous) between I/O ports and the backplane. This barrier prevents field-side electrical noise or surges from damaging the central controller, ensuring clean data transmission in electrically "noisy" industrial settings.

• Compact Footprint for High Density: At only 4.2 cm wide, this 3-slot base maximizes rail space. It solves the challenge of limited cabinet depth and width, allowing engineers to deploy redundant architectures in confined spaces that typically only accommodate simplex I/O.

FAQs

• Does this base unit include the I/O modules?

  No. The 1715-A3IO is the mechanical and electrical base unit. You must purchase the 1715-series I/O modules separately to populate the three available slots.

• Can I use this in hazardous locations?

  Yes. The T4 temperature rating (North American and IEC standards) permits installation in specific hazardous environments, provided the overall enclosure meets the requirements of the zone.

• What is the purpose of the 50 mA fuse?

  The 1715-A3IO includes a Type T fuse to protect the internal circuitry against overcurrent conditions. This safeguard prevents a single module fault from compromising the entire redundant backplane.

• How do I mount the 1715-A3IO?

  The unit clips directly onto a standard 35mm DIN rail. It interfaces horizontally with other 1715 base units (such as the 1715-A2A adapter base) to expand the I/O bus.