Installation Instructions for Allen-Bradley 1734-ACNR POINT I/O ControlNet Adapter

A comprehensive installation and configuration guide for the Allen-Bradley 1734-ACNR and 1734-ACRNK ControlNet Adapter. Includes step-by-step mounting instructions, wiring diagrams, status indicator troubleshooting, and technical...

Quick answers from the manual

Quick answer

The 1734-ACNR is a communication interface for POINT I/O modules on a ControlNet network. Installation requires mounting on a DIN rail, setting the node address (01-99), and connecting 24V DC power. p. 5, 6, 7

Key actions

Set the node address p. 6
Mount the adapter p. 6

First start

Configure autobaud p. 5

Problems and fixes

Module status flashing red

Recoverable fault: Firmware update, MAC ID changed, or CPU load exceeded.

p. 8

Maintenance and reset

Use a soft dry anti-static cloth to wipe down equipment. Do not use any cleaning agents. p. 4

Technical specifications

Parameter	Value	Meaning	Pages
Input voltage	10-28.8V DC	Nominal 24V DC input range.	p. 9

Where to find it in the PDF

Installation p. 6
Status Indicators p. 8

Table of contents

Manual images

Click an image to enlarge

Figure 1 - POINT I/O ControlNet Adapter features

Page 5

Page 6

Page 7

Page 7

Page 8

Page 12

Quick Guide from the Manual

The 1734-ACNR and 1734-ACRNK are communication interfaces for POINT I/O modules on a ControlNet network. This document provides essential procedures for installation, wiring, and troubleshooting. Important: This equipment is intended for use in Pollution Degree 2 industrial environments and must be mounted within an enclosure. Always ensure power is removed or the area is nonhazardous before performing installation or maintenance to prevent electric arcs.

Installation

The adapter is designed for DIN rail mounting. Follow these steps to install:

Position the adapter vertically above the DIN rail.
Press down firmly until the locking mechanism snaps into place.
Set the node address using the 2-position thumbwheel switch (valid range 01-99).
Remove the safety end cap by sliding it up to expose backplane and power interconnections.
If replacing an existing adapter, disconnect the ControlNet connector, remove the RTB, and use a small screwdriver to release the DIN rail locking screw.

Wiring

Proper wiring is critical for system operation. Use zinc-plated chromate-passivated steel DIN rail to ensure proper grounding. Secure the DIN rail to the mounting surface approximately every 200 mm.

Adapter Wiring: Connect the ControlNet cable using a tap; do not connect directly to the coax cable.
Power Wiring: Connect 12/24V DC power to the internal power bus. Do not connect 120/240V AC power.
NAP Port: The Network Access Port (NAP) is for temporary local programming only and requires a 1786-CP cable assembly.

Status Indicators

The adapter features several status LEDs to assist with troubleshooting:

Module Status: Steady green indicates normal operation. Flashing red indicates a recoverable fault (e.g., MAC ID changed, CPU load exceeded). Steady red indicates an unrecoverable fault (e.g., self-test failure).
ControlNet A/B Status: Steady green indicates normal operation (MAC frames received). Flashing red/off indicates a severe link error.
POINTBus Status: Green indicates the adapter is online with connections established.

Specifications

Key technical parameters for the 1734-ACNR adapter:

Input Voltage: 10-28.8V DC (Nominal 24V DC).
Operating Temperature: -20 to +55 °C (-4 to +131 °F).
Expansion I/O Capacity: Up to 17 modules (dependent on backplane bus current draw).
Dimensions: 76.2 x 54.9 x 133.4 mm.

Manufacturer information

Allen-Bradley

Brand profile

Manufacturer website https://www.rockwellautomation.com Support https://www.rockwellautomation.com/en-us/support.html Manufacturer manuals https://www.rockwellautomation.com/en-us/support/literature-library.html

Practical help

Common problems

Module status LED is flashing red

A recoverable fault has occurred. Check for firmware updates, MAC ID changes, or excessive CPU load.

Improper grounding

Ensure you are using zinc-plated chromate-passivated steel DIN rail. Aluminum or plastic rails can result in intermittent grounding.

Electric arc during installation

Ensure power is removed or the area is confirmed nonhazardous before connecting or disconnecting any wiring or modules.

Before use

Verify you are using Series C POINT I/O modules (Series A and B are not compatible).
Ensure the DIN rail is zinc-plated steel and secured every 200 mm.
Confirm the power supply is 24V DC (10-28.8V DC range).
Set the node address thumbwheel to the desired address (01-99).
Ensure the safety end cap is removed only when necessary and replaced to cover exposed interconnections.

Specs in practice

Input Voltage: Nominal 24V DC, with an operating range of 10-28.8V DC.
Operating Temperature: The device is rated for -20 to +55 °C (-4 to +131 °F).
Expansion I/O Capacity: Supports up to 17 modules, provided the total backplane current draw does not exceed 1.3 A.

Images and diagrams

Figure 1: Identifies external features including the node address thumbwheel, status indicators, and terminal blocks.
Figure 2: Shows the adapter wiring layout, including Coaxial channels A/B and terminal assignments.
Figure 3: Illustrates the 12/24V DC power supply connection to the internal power bus.

Model compatibility

Requires Series C POINT I/O modules.
Not compatible with Series A or B POINT I/O modules.
Intended for use in Pollution Degree 2 industrial environments.

Show more Show less

Manual page author

David Miller

Documentation analyst

Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.