The ABB IPR/S3.1.1 KNX IP Router connects the KNX twisted-pair bus to an Ethernet (IP) network using the standard KNXnet/IP protocol. Occupying just 2 modular spacings (2 MW) on DIN rail, it operates as a fast line and area coupler with full filter-table support for main groups 0–31, enabling structured segmentation of large ABB i-bus® KNX installations.

The router provides 5 Tunneling Servers for simultaneous ETS programming and client access over LAN. Power is supplied via 12 … 30 V DC auxiliary voltage or PoE (IEEE 802.3af class 1). Standard KNX multicast can be disabled to allow up to 10 IPR/S 3.1.1 devices to communicate via unicast.

Key Features — Routing, Tunneling, and Network Integration

KNXnet/IP Connectivity

• Routing: Links KNX lines and areas across the IP backbone with configurable group-address filtering.
• Tunneling: 5 Tunneling Servers for ETS commissioning and visualization clients over Ethernet.
• IP addressing: Fixed IP or automatic allocation via DHCP.
• Multicast / Unicast: Standard KNX multicast can be switched off; up to 10 routers support unicast communication.

Installation and Power

• Compact MDRC: 2 MW (36 mm) DIN-rail module — same footprint as line couplers and small power supplies.
• Dual power options: 12 … 30 V DC from a KNX power supply, or PoE from a compatible network switch.
• Low power loss: 1.5 W typical consumption.

At a Glance

Specification	Detail
Product type	KNX IP Router — KNXnet/IP (standard, non-secure)
Order code	IPR/S3.1.1 (2CDG110175R0011)
Coupler function	Fast line and area coupler; filter table main groups 0–31
Tunneling servers	5
Power supply	12 … 30 V DC or PoE (IEEE 802.3af class 1)
Power loss	1.5 W
Dimensions (W × H × D)	36 × 90 × 64.5 mm (2 MW)
Protection	IP20
Bus system	KNX TP + Ethernet (100 Mbit/s)

Full electrical ratings, ordering codes, and classification data are listed under Technical Specifications. Technical data, product manual, installation instructions, ETS application, CAD, and EPLAN data are under Downloads.

Applications and KNX Integration

• Multi-line buildings: Bridge KNX lines or areas over existing IP infrastructure without additional TP cabling between floors.
• Remote ETS access: Commission and service devices on remote lines via tunneling from a PC on the LAN.
• Visualization backbone: Connect server-based visualization or gateways to multiple KNX segments through one IP router per line.
• ETS configuration: Import the official .knxprod application (Downloads), assign physical address, configure filter table and tunneling endpoints.
• Power planning: When not using PoE, supply auxiliary power from an ABB KNX power supply such as the SV/S 30.640.3.1 KNX Power Supply 640 mA.

Choosing IP Routers and Line Couplers

For projects requiring encrypted IP communication, choose the IPR/S3.5.1 KNX IP Router Secure with KNXnet/IP Secure. For segmenting KNX lines on the twisted-pair side without IP, use the LK/S 4.2 KNX Line Coupler as a TP line, area, or repeater coupler with KNX Data Secure support.