
Product Overview
The Allen-Bradley 1761-NET-AIC is an Advanced Interface Converter (AIC+) used in MicroLogix and SLC communication systems. It is designed to provide electrical signal conversion and network isolation between RS-232 and DH-485 networks, enabling reliable multi-device serial communication in industrial automation systems.
It is commonly used when multiple controllers or HMIs need to communicate over a DH-485 network where direct RS-232 point-to-point communication is not sufficient.
Technical Specifications
| Parameter |
Details |
| Product Type |
Advanced Interface Converter |
| Manufacturer |
Allen-Bradley |
| Model |
1761-NET-AIC |
| Function |
RS-232 to DH-485 / RS-485 conversion |
| Communication Protocols |
DF1, DH-485, ASCII |
| Ports |
2 × RS-232, 1 × DH-485 |
| Power Supply |
20.4 – 28.8V DC |
| Current Draw |
~120 mA |
| Isolation |
500V DC electrical isolation |
| Mounting Type |
DIN rail or panel mounting |
| Operating Temperature |
0 to 60°C |
| Dimensions |
118 × 52.07 × 64.8 mm |
| Weight |
0.2 kg |
Function and Working Principle
The 1761-NET-AIC acts as a communication bridge between serial devices and DH-485 networks. Since RS-232 is point-to-point, the AIC allows multiple devices to share a common communication network by converting signals into a multidrop-compatible format.
It performs:
- RS-232 to DH-485 signal conversion
- Electrical isolation between devices
- Network expansion for MicroLogix and SLC controllers
- Multi-drop communication support
This makes it essential for older Allen-Bradley serial-based automation networks.
Industrial Role
The 1761-NET-AIC is typically used in:
- MicroLogix 1000/1200/1500 systems
- SLC 500 PLC networks
- HMI-to-PLC communication setups
- Legacy DH-485 industrial networks
- Multi-device serial communication systems
It enables multiple controllers and operator interfaces to communicate on the same network.
Installation and Integration
- Mounted on DIN rail or panel
- Powered by 24V DC supply
- Connected via RS-232 and DH-485 ports
- Requires proper node addressing for network communication
- Used alongside MicroLogix PLCs and HMIs
Compatible Systems
- Allen-Bradley MicroLogix PLCs
- SLC 500 controllers
- PanelView operator terminals
- Industrial PCs with RS-232 ports
- DH-485 network devices
Alternative / Replacement Options
| Model |
Description |
| 1761-NET-ENI |
Ethernet communication module (modern replacement for many cases) |
| 1761-NET-ENIW |
Enhanced Ethernet interface |
| MicroLogix 1100/1400 |
Built-in Ethernet reduces need for AIC |
| 1747-UIC |
USB to DH-485 interface (for programming) |
| Ethernet/IP gateways |
Modern industrial network solutions |
Key Advantages
- Enables multi-device DH-485 networking
- Provides electrical isolation for protection
- Supports legacy Allen-Bradley systems
- Reliable serial communication conversion
- Compact and easy DIN-rail installation
- Stable operation in industrial environments
Conclusion
The Allen-Bradley 1761-NET-AIC Advanced Interface Converter is a key communication module for legacy MicroLogix and SLC systems. It enables RS-232 to DH-485 conversion, allowing multiple devices to communicate reliably on a shared industrial network while providing electrical isolation and stable performance in automation environments.