Product Overview:
The AEG AS-C484-266 is a communication interface module from the AEG AS automation product line. It functions as a protocol gateway, translating between different industrial fieldbus protocols to enable interoperability between devices from different manufacturers. It is primarily used in building automation, process control, and SCADA systems where multi-vendor device integration is required.

Technical Specifications:

• Module Type: Protocol Converter / Fieldbus Gateway
• Supported Protocols (Side A): Profibus DP (Slave), Baud rate 9.6 kbps – 12 Mbps
• Supported Protocols (Side B): Modbus TCP/IP (Ethernet), Baud rate 10/100 Mbps auto-negotiate
• Number of Ports: 2 (1× RS-485 / 1× RJ45 Ethernet)
• Power Supply: 24V DC (via bus or external PSU)
• Current Consumption: 350 mA (typical)
• Isolation Voltage: 1500V DC between ports and 500V DC between channels
• Operating Temperature: -10°C to +60°C
• Dimensions (W×H×D): 50 mm × 125 mm × 95 mm
• Mounting: DIN rail (35 mm)
• Weight: 0.42 kg
• LED Indicators: Power (green), Port A activity (yellow), Port B activity (green), Fault (red)

Material Composition:

• Housing: Flame-retardant polycarbonate (PC), UL94 V-0
• PCB: FR-4, 4-layer, gold-plated edge connector
• Connectors: Sub-D 9-pin (RS-485), RJ45 with integrated magnetics (Ethernet)
• Isolation: Digital isolators (Si86xx series) per channel
• EMC Protection: TVS diodes, common-mode chokes on both ports

Structural Features:

• DIN rail mounting with lock-in clip
• Front panel: 4 LED status indicators + 2 DIP switches for address setting
• Top: RS-485 (Sub-D 9) and RJ45 Ethernet ports with dust caps
• Bottom: 24V DC power terminal block and ground terminal
• Firmware updatable via Ethernet port using TFTP

Working Principle:
The module continuously monitors both ports. Data packets received on Port A (Profibus DP) are parsed, mapped to Modbus register addresses, and retransmitted on Port B (Modbus TCP/IP) to the SCADA/BMS system. Conversely, Modbus write commands from the SCADA are converted to Profibus DP write commands and sent to field devices (VFDs, sensors, actuators). The protocol mapping is configured via DIP switches and a local web interface. All data transfer is galvanically isolated to prevent ground loops.

Key Advantages:

• Dual-protocol support eliminates need for separate gateway hardware — reduces BOM cost by 30%
• 1500V isolation between ports protects sensitive SCADA equipment from field-side transients
• Web-based configuration — no proprietary software required for setup
• TFTP firmware update enables remote maintenance without physical access
• LED status indicators provide immediate diagnostic feedback

Applicable Industries:

• Building Management Systems (BMS) — HVAC, lighting, access control integration
• Industrial process automation — connecting legacy Profibus devices to Ethernet-based SCADA
• Water/wastewater treatment — integrating multi-vendor PLCs and sensors
• Energy management — connecting smart meters (Modbus) to building controllers (Profibus)

Installation Requirements:

• Mount on 35 mm DIN rail in control cabinet
• Connect RS-485 A/B to Profibus network — terminate with 120Ω resistor at last device
• Connect RJ45 to Ethernet switch — use shielded Cat5e/Cat6 cable
• Set DIP switches: Switch 1 = Profibus address (1–126), Switch 2 = Modbus unit ID (1–247)
• Power from 24V DC bus — verify polarity before energizing

Usage Precautions:

• Do not connect both ports to the same network segment — will cause broadcast storms
• Set Profibus address using DIP switches before connecting to bus — duplicate addresses cause bus errors
• Maximum cable length: 1200 m for Profibus DP (RS-485), 100 m for Ethernet
• Update firmware only via TFTP from trusted IP addresses — unauthorized firmware can brick the module
• Clean RJ45 port contacts with contact cleaner every 12 months in dusty environments