Allen Bradley 1794-ACNR15 FLEX I/O Redundant ControlNet Adapter Module

Overview

The Allen-Bradley 1794-ACNR15 is a high-performance FLEX I/O ControlNet adapter designed for industrial automation systems requiring reliable, redundant communication. It connects distributed FLEX I/O modules to ControlNet networks, ensuring continuous data transfer even in mission-critical environments. Moreover, its compact DIN rail design simplifies panel integration and optimizes space utilization. This module supports up to eight FLEX I/O modules, delivering consistent performance across diverse industrial applications. In addition, built-in LEDs provide intuitive status monitoring for both communication channels and connected I/O devices.

Key Features

• Redundant Communication: Dual ControlNet ports automatically switch over to maintain connectivity if one network fails.

• Distributed I/O Support: Integrates remote FLEX I/O modules into ControlNet systems, enabling scalable automation architectures.

• High Reliability: Engineered for demanding industrial environments, including manufacturing, energy, and utilities sectors.

• Compact DIN Rail Design: Saves panel space while providing secure mounting for modular installations.

• Future Planning: Scheduled for discontinuation on October 31, 2026; replacement planning recommended.

Technical Specifications

• Communication Protocol: ControlNet 1.5

• Data Rate: 5 Mbps

• ControlNet Ports: Two BNC ports supporting dual media redundancy

• I/O Capacity: Supports up to 8 FLEX I/O modules

• Power Supply: 19.2–31.2 VDC (nominal 24 VDC), max 450 mA

• Power Dissipation: 3.4 W maximum @ 19.2 VDC

• Flexbus Output Current: 640 mA maximum

• Indicators: LED status for Comm A/B and I/O health (red/green)

• Mounting: DIN rail

• Operating Temperature: -20…55 °C (-4…131 °F)

• Vibration & Shock: IEC 60068-2-6, 5 g; IEC 60068-2-27, 30 g

• Isolation Voltage: 850 VDC

• Inrush Current: 23 A for 2 ms

• Weight: 0.51 lbs

Typical Applications

• Process automation systems requiring fault-tolerant communication

• Distributed I/O in manufacturing plants and industrial facilities

• High-availability systems in energy, utilities, and transportation

• ControlNet-based architectures demanding consistent uptime and reliability

FAQ

Q1: How many FLEX I/O modules can this adapter support?
A1: The 1794-ACNR15 supports up to eight FLEX I/O modules per adapter.

Q2: What type of communication redundancy does this module provide?
A2: It features dual ControlNet ports that allow automatic switchover if one network path fails.

Q3: What is the operating temperature range?
A3: The module operates reliably between -20 °C and 55 °C (-4 °F to 131 °F).

Q4: Can it be mounted on a standard DIN rail?
A5: Yes, it is designed for easy DIN rail installation in industrial panels.