Application Scenarios
In a water treatment facility, an aging SLC 5/03 processor controlling chemical dosing pumps communicates via its Channel 0 (DH-485 protocol). The plant engineer needs to connect a modern SCADA workstation, which only has an RS-232 port and expects DF1 protocol communication. The 1761-NET-AIC is deployed as the intermediary. The SCADA PC connects to the converter’s DB-9 RS-232 port, while the SLC processor links to its DH-485 terminal block port. The 1761-NET-AIC seamlessly translates the protocols and provides 500V of optical isolation, protecting the expensive SCADA hardware from ground loops and electrical noise generated by the motor control circuits. This setup extends the life of the legacy PLC system without requiring a costly full-system rip-and-replace.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1761-NET-AIC |
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Product Category | Advanced Interface Converter (AIC+) |
| Series | MicroLogix 1000 / SLC Communication |
| Power Supply | 20.4 – 28.8V DC (24V DC nominal) |
| Current Draw | 120 mA typical (200 mA max inrush) |
| Communication Ports | 2 x RS-232 (DB-9 & 8-pin Mini-DIN), 1 x DH-485 (Phoenix Connector) |
| Internal Isolation | 500V DC (Between Ports) |
| Supported Protocols | DF1, DH-485, ASCII |
| Baud Rate | 600 to 19,200 bps (Selectable/Auto) |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) |
| Mounting | DIN Rail or Panel Mount |
| Key Feature | Power Source Selector Switch (External/Cable) |
Technical Principles and Innovative Values
- Innovation Point 1: Multi-Protocol Bridging with Active Signal ConditioningThe 1761-NET-AIC is more than a simple level shifter; it actively manages protocol timing and handshaking. It can buffer and convert between the point-to-point DF1 protocol and the multi-drop DH-485 network protocol, handling the complex turnaround timing and hardware handshaking (RTS/CTS) automatically. This eliminates data collisions and lock-ups that were common when using simple passive adapters.
- Innovation Point 2: Dual-Power Flexibility and Cable-Powered OperationA key design innovation is its flexible powering scheme. It can be powered by an external 24V DC supply or, crucially, via the 8-pin Mini-DIN communication cable when connected to a compatible MicroLogix controller. This “cable power” feature simplifies wiring in tight control panels and reduces the need for an additional power supply, lowering the total installed cost.
- Innovation Point 3: Robust Industrial HardeningUnlike commercial-grade serial converters, the 1761-NET-AIC is built for harsh environments. It features 500V optical isolation on all ports, which breaks ground loops and protects against voltage transients. Its wide operating temperature range and high immunity to EMI/RFI make it suitable for installation directly in motor control centers (MCCs) without signal degradation.
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