1771-ACN15 Allen Bradley ControlNet I/O Adapter Module

Product Overview

The Allen-Bradley 1771-ACN15 is a ControlNet adapter module for the PLC-5 platform. It connects 1771 I/O chassis to a ControlNet network, enabling deterministic, high-speed remote I/O communication between the PLC-5 processor and distributed I/O racks.

Technical Specs

• Network: ControlNet
• Media connection: 1 BNC connector (non-redundant), 1 NAP (RJ-48 8-pin with shield)
• Backplane current: 1.0 A @ 5 V DC
• Module location: Leftmost slot of 1771 I/O chassis
• Keying: Between 16-18 and 54-56
• Weight: 1.0 kg (2.1 lb)
• Cable: Quad-shield RG-6 coaxial

Key Features

• Deterministic ControlNet communication for real-time I/O updates
• Single BNC port for non-redundant media installations
• Supports rack connections to PLC-5 processors
• Network Access Port (NAP) for local configuration and diagnostics

FAQ

• What is the difference between ACN15 and ACNR15? The ACN15 supports non-redundant media with one BNC port; the ACNR15 adds a second BNC for redundant media.
• Which slot does it install in? The leftmost slot of the 1771 I/O chassis.
• What software configures the network? RSNetWorx for ControlNet with RSLinx communication software.

Installation Guide

1. Power down the 1771 I/O chassis.
2. Install the module in the leftmost slot with keying bands at positions 16-18 and 54-56.
3. Connect the BNC port to the ControlNet trunkline via a ControlNet tap.
4. Configure the node address and network parameters using RSNetWorx.
5. Verify network status LEDs indicate active communication.

Selection Tips

• Select 1771-ACN15 for standard ControlNet applications; choose 1771-ACNR15 for redundant media requirements.
• Confirm the chassis power supply supports 1.0 A backplane load.
• Use 1786-RG6 quad-shield coaxial cable for all ControlNet connections.