1794-ACNR15XT | 1794-ACNR15XT | Allen-Bradley | ControlNet Adapter

Technical Summary

The 1794-ACNR15XT (1794-ACNR15XT) is a high-availability ControlNet adapter specifically engineered for the FLEX I/O XT™ platform. This module facilitates high-speed, deterministic data exchange between a central controller and distributed I/O modules. Unlike standard adapters, the "XT" designation signifies extended environmental protection, allowing the unit to operate in corrosive or extreme temperature conditions. It features dual BNC ports to support redundant media signaling, ensuring network resilience in mission-critical applications where downtime is not an option.

Detailed Technical Specifications

• Communication Interface: ControlNet (Redundant Media Support)

• Network Speed: Fixed at 5 Mbps

• Connectivity: 2 BNC connectors for redundant coaxial cable trunk lines

• Input Voltage Requirement: 24V DC nominal (19.2 to 31.2V DC range)

• Current Consumption: 400 mA maximum at 24V DC

• FlexBus Output Capacity: 640 mA maximum at 5V DC (powering up to 8 I/O modules)

• Thermal Dissipation: Approximately 11.1 BTU per hour

• Isolation Rating: 50V continuous (Basic Insulation Type)

• Dielectric Withstand: Tested at 860V AC for 60 seconds

• Operating Temperature Range: -25°C to +70°C (-13°F to +158°F)

• Storage Environment: -40°C to +85°C (-40°F to +185°F)

• Humidity Tolerance: 5% to 95% non-condensing

• Vibration and Shock: 5 g acceleration at 10–500 Hz; 30 g operating shock

• Enclosure Rating: IP20 (Open-style)

• Mounting Options: Horizontal or vertical DIN rail; optional panel mount

Advanced Capability and Application

The 1794-ACNR15XT (1794-ACNR15XT) excels in heavy-duty sectors such as oil and gas, wastewater treatment, and chemical processing. Because it is conformal coated, it offers superior resistance to noxious gases and humidity compared to standard 1794-ACNR15 models. By supporting up to 8 FLEX I/O modules, a single adapter can manage a significant density of digital, analog, or specialty signals while maintaining a compact footprint.

Common Maintenance FAQ

• What is the primary benefit of the XT version over the standard 1794-ACNR15?The 1794-ACNR15XT (1794-ACNR15XT) is designed for "Extended Temperature" and harsh environments, providing a wider operating range (-25°C to +70°C) and additional protection against atmospheric contaminants.

• Does this module support ControlNet redundancy?Yes, the dual BNC ports allow for media redundancy. If one cable path is compromised, the module automatically utilizes the second path without interrupting the I/O process.

• Can I mix XT and non-XT modules on the same FlexBus?While physically possible, the overall system environmental rating will be limited to the lowest-rated component. For full XT benefits, the entire terminal base and I/O assembly should be XT-rated.