Allen-Bradley 1734-ACNR ControlNet Adapter Module

1734-ACNR POINT I/O ControlNet Adapter – Reliable Network Interface

Product Introduction

The 1734-ACNR from Allen-Bradley serves as a dedicated ControlNet adapter within the POINT I/O family. This module creates a seamless communication link between a ControlNet network and various I/O modules, enabling fast and deterministic data exchange. Furthermore, it supports redundant media configurations, which enhances network reliability for critical applications. With its compact form factor and standard 24 Volts DC input, the 1734-ACNR integrates easily into existing control architectures. Its network access port also allows for local configuration and diagnostics without disrupting the main network traffic.

Key Technical Specifications

This ControlNet adapter operates on a nominal 24 Volts DC input voltage and draws 425 milliamps of power under normal conditions. Its inrush current reaches 6 amps for 10 milliseconds during startup, which is typical for this class of device. The 1734-ACNR consumes 8 watts of total power and dissipates approximately 2.8 watts at 28.8 Volts DC. For backplane communication, it supplies 1000 milliamps of POINTBus current to power connected I/O modules. Input overvoltage protection includes reverse polarity protection, safeguarding the module from accidental wiring errors. The adapter connects to the ControlNet network via two BNC-style connectors, supporting both trunk-line and drop-line topologies.

Connection Capacity and I/O Expansion

Using just one 1734-ACNR adapter, you can establish multiple I/O control connections to suit different module types. Specifically, it supports up to 5 rack-optimized connections for digital I/O modules, which efficiently groups multiple modules into a single connection. For analog or specialty modules, it allows up to 25 direct connections, giving you finer control over each individual channel. The total number of supported connections ultimately depends on your specific I/O configuration and network bandwidth. Moreover, you can expand the I/O capacity to as many as 63 I/O modules by adding multiple 1734-EP24DC power supplies along the POINTBus. This scalability makes the 1734-ACNR suitable for both small distributed stations and larger control subsystems.

Compatibility and Media Support

It is important to note that the 1734-ACNR only controls I/O modules from Series C or later. Earlier series modules are not compatible, so always verify your module revisions before installation. On the network side, this adapter handles redundant media, meaning you can connect two ControlNet cables for fault tolerance. If one cable fails, the adapter automatically switches to the redundant path without interrupting communication. Additionally, the local network access port provides a convenient point for temporary connection of a programming terminal or diagnostic tool, simplifying setup and troubleshooting.

Mechanical and Environmental Parameters

The 1734-ACNR operates within a temperature range of 0 to 55 degrees Celsius and stores safely between -40 and 85 degrees Celsius. It withstands non-condensing humidity from 5 to 95 percent, making it suitable for most industrial environments. For vibration resistance, it handles 5 G at 10 to 500 Hertz, and shock tolerance reaches 30 G. The module mounts directly on a DIN rail inside a control cabinet, and its compact design occupies a single POINT I/O slot. Power dissipation remains low at 2.8 watts, so heat buildup is minimal even in densely populated racks.

Installation Guidelines

Installing the 1734-ACNR requires a standard DIN rail and a 24V DC power source. Begin by snapping the module onto the DIN rail, ensuring it locks firmly into place. Next, connect the 24V DC power supply to the terminals, observing correct polarity to avoid triggering the reverse polarity protection. For the ControlNet network, attach the coaxial cables to the BNC connectors, using terminators at both ends of the trunk line if necessary. If you plan to use redundant media, connect both cables and verify that the adapter recognizes both paths. Finally, power up the system and check the status indicators on the front panel to confirm normal operation.

Packaging List

• Allen-Bradley 1734-ACNR ControlNet Adapter Module (1 unit)

• DIN rail mounting base (pre-attached)

• Removable terminal block (for power connection)

• Quick start installation guide

• Anti-static protective bag

Shipping Information

All orders ship via FedEx, UPS, or DHL with real-time tracking and insurance included. Express delivery options are available at checkout.

Frequently Asked Questions

Q1: Can the 1734-ACNR work with older POINT I/O modules?
No, this adapter only supports Series C or later modules. Check the series marking on your I/O modules before connecting.

Q2: How many I/O modules can I connect to one 1734-ACNR?
With additional 1734-EP24DC power supplies, you can expand up to 63 I/O modules per adapter, depending on power and network limits.

Q3: What does the redundant media feature do?
It allows connection of two ControlNet cables. If the primary cable fails, the adapter automatically switches to the secondary path for uninterrupted communication.

Q4: Is the 1734-ACNR compatible with RSLogix 5000?
Yes, you can configure and monitor this adapter using RSLogix 5000 or Studio 5000 software via the ControlNet network.

Q5: What is the difference between rack-optimized and direct connections?
Rack-optimized connections group multiple digital modules into one connection, saving bandwidth. Direct connections assign a separate connection to each analog or specialty module for detailed control.