Product Overview

The Allen-Bradley 1761-NET-AIC, commonly known as the AIC+, is a high-performance Advanced Interface Converter designed to bridge communication between RS-232 devices and DH-485 networks. This module provides essential signal conversion and electrical isolation, allowing DF1-compatible controllers—such as the MicroLogix and SLC 500 series—to integrate seamlessly into a multi-node DH-485 architecture.

By converting RS-232 signals to the RS-485 electrical standard used by DH-485, the 1761-NET-AIC enables expanded networking capabilities and long-distance data transmission for legacy and standard industrial automation systems. It is an indispensable tool for engineers looking to connect multiple PLCs, HMIs, and programming workstations on a single network link while maintaining complete electrical protection between nodes.

Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation

• Model Number: 1761-NET-AIC

• Module Type: RS-232 to DH-485 Interface Converter

• Communication Port A: RS-232 (8-pin Mini-DIN)

• Communication Port B: RS-232 (9-pin D-Shell)

• Communication Port C: DH-485 (6-pin Phoenix Connector)

• Input Voltage: 24V DC (External or via Cable)

• Current Draw: 120 mA @ 24V DC

• Isolation: 500V DC (between communication ports and power)

• Mounting: DIN Rail or Panel Mount

• Dimensions: 5 x 7 x 12.5 cm

• Weight: 0.2 kg

Key Technical Characteristics

• Tri-Port Connectivity: Features three independent ports (two RS-232 and one DH-485), providing maximum flexibility for connecting a local controller and a programming terminal simultaneously to a broader network.

• Dual Power Modes: The unit can be powered directly from a MicroLogix controller via the communication cable or through an external 24V DC supply. A physical selector switch allows users to toggle between "External" and "Cable" power sources.

• Point-to-Point and Multi-Drop Support: Operates effectively as a point-to-point isolator between two RS-232 devices or as a node interface for a multi-drop DH-485 industrial fieldbus.

• Baud Rate Adaptability: Includes a front-panel selector switch to manually set communication speeds, ensuring compatibility with various hardware generations and network traffic requirements.

• Industrial Isolation: Provides robust opto-isolation to prevent ground loops and protect sensitive PLC circuitry from transients and electrical noise in harsh industrial environments.

System Compatibility

The 1761-NET-AIC is compatible with a wide array of Rockwell Automation hardware, including:

• MicroLogix Series: 1000, 1100, 1200, and 1500.

• SLC 500 Series: SLC 5/01, 5/02, 5/03, and 1747-AIC Link Couplers.

• Fixed Controllers: Compatible with various PC-based programming interfaces and PanelView™ operator terminals utilizing the DH-485 protocol.