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KNX: The Standard in Home and Building System Technology

KNX is a uniform, manufacturer-independent communication protocol for intelligently networking state-of-the-art home and building system technologies. KNX is used to plan and control energy-efficient solutions for more functionality and convenience while simultaneously reducing energy costs.

KNX System Features:

  • A distributed bus system that allows devices to exchange information directly
  • Bus voltage: 24 VDC (+6/-4 V)

  • CSMA/CA protocol protects against data loss resulting from telegram collisions.

  • Up to 12,000 bus nodes can be connected

  • Data transmission rate of 9.6 kBit/s, termination resistors not required

KNX Simply Explained

For more than 20 years, KNX has proven itself as a global standard for home and building automation in accordance with EN 50090 and ISO/IEC 14543. A great advantage of KNX is its remote configuration: Instead of a central device, the functions are accommodated in the individual bus subscribers. The sensors, such as switches and presence detectors, send control commands directly to the lights, blinds, heating and ventilation systems. Assignments and functions are easily configured in the “Engineering Tool Software” (ETS) and can be modified or adjusted at any time.

KNX supports different transmission media, e.g., twisted-pair cable (KNX TP), ETHERNET (KNX IP), radio (KNX RF) or Powerline (KNX PL). With KNX, devices from different manufacturers are compatible and can be flexibly combined in one comprehensive solution. As each device has its own microprocessor, no control station is required.

Variable and Individualized – Using KNX in Building Automation

As an open standard, KNX technology provides a uniform, convenient user interface for home and building automation – from residential to commercial applications. Thanks to a broad range of applications, numerous devices and systems can be linked together with KNX. For example, this allows a networked system consisting of lighting, shading and HVAC to be easily controlled in commercial and utility buildings according to user requirements.

The individual components of a KNX system include sensors and actuators. Sensors such as thermostats, switches or wind gauges, generate commands in the form of telegrams. These telegrams are turned into actions by the actuators (e.g., switching relays for blinds or lighting). A two-wire bus line provides the connection, and thus telegram traffic, between sensors and actuators. As a result, individual system components do not have to be networked, which significantly reduces the amount of wiring.

Your Benefits:

  • Easy configuration and commissioning

  • Numerous manufacturers can use a large device portfolio

Functionality and Convenience: WAGO and KNX

With the KNX IP Controller (750-889) and the KNX TP1 Module (753-646), WAGO provides an innovative and upgradable solution to building automation. Connectivity to conventional sensors and actuators, as well as complex connections to DALI, EnOcean and others, are cost-effectively unified on the WAGO KNX IP Controller. The WAGO KNX TP1 Module connects to TP1 networks. ETHERNET as a medium, along with KNX IP as a transmission protocol, enable high-speed communication between devices while providing seamless integration into existing infrastructures.

Together, the KNX IP Controller and the KNX/TP1 Module make up the KNXnet IP Router, which connects traditional TP1 networks to ETHERNET. This considerably increases the transmission speed within a KNX network. It also enables a high level of data traffic on the backbone, preventing a bottleneck to the superimposed visualization system. The KNX IP Router also acts as a network interface for the ETS software for configuration and parameter setting. The respective product databases/plug-ins for the KNX IP Controller, KNX TP1 Module and KNX IP Router do more than support device-specific configuration. For convenient use, they are designed so that you can apply already known and proven methods and procedures of the ETS.

WAGO and KNX Advantages:

  • Freely programmable applications offer high project flexibility
  • Ability to connect digital and analog sensors, actuators and subsystems (e.g. DALI, EnOcean, etc.)
  • High speed, fast response times and larger amounts of data on devices directly connected to the ETHERNET
  • Complete integration of twisted-pair devices
  • KNX IP Controller can be combined with the KNX TP1 Module for versatile applications
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KNX System Graphics

KNX Products from WAGO

KNX IP Controller (750-889)

Free programmability makes the KNX IP Controller a powerful room and zone controller. It combines the benefits of the KNX IP communication protocol with the modular WAGO-I/O-SYSTEM 750. This means any control and regulation tasks in flexible building automation can be handled.

The KNX IP Controller is not only characterized by its extremely powerful processor, but also by its extensive data, program and retain memory. The large memory provides reserves for complex controller tasks. With the integrated 2-port switch, the controller can also be integrated in an ETHERNET line topology. If you need additional storage for complex Web visualizations or trend log data, for example, the on-board SD card slot can be used to save data to an SD card. The SD card is also practical for “backup & restore” functions, allowing you to not only archive the PLC program, but to also restore the program in case of service. The IP address, from which the controller is always accessible and reconfigurable, can be restored at any time at the touch of a button. Limiting telegram rates and an optimized boot sequence improve network traffic for faster startup.

Advantages:

  • Freely programmable control unit
  • Integrated KNX IP router
  • Combinable with all 750 Series I/O Modules
  • Slot for SD card
  • Button for restoring the IP address
  • Improved engineering workflow
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KNX TP1 Module (753-646)

The KNX TP1 Module provides two separate functions, which set themselves up automatically depending on the application. On the one hand, you can use the module as a KNX interface for the programmable controller of the WAGO 750 I/O-SYSTEM. In this case, it constitutes a standard KNX bus node on the KNX side, which is incorporated into a KNX network by means of the ETS. In combination with other modules connected to the controller, it can be used as a flexible interface to other building automation protocols and sub-busses including BACnet, MODBUS, TCP, DALI and EnOcean.

On the other hand, the module can also be used as a TP1 interface for the KNX IP router. In this case, the KNX TP1 network is routed to ETHERNET and can be operated via the ETHERNET network.

The application is programmed via WAGO‐I/O‐PRO CAA. An ETS plug-in is required so that data from the application program can be allocated to group addresses.


Advantages:

  • Integration of KNX TP1 networks into the WAGO-I/O-SYSTEM
  • Combinable with all building-related WAGO controllers (e.g., BACnet)
  • Supports 254 KNX objects
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KNX Router (750-889 and 753-646)

Controller and Module: Router

Together, the KNX IP Controller and the KNX/TP1 Module make up the KNXnet IP Router, which connects traditional TP1 networks to ETHERNET. This considerably increases the transmission speed within a KNX network. It also enables a high level of data traffic on the backbone, preventing a bottleneck to the superimposed visualization system. The KNX IP Router also acts as a network interface for the ETS 3/4 software for configuration and parameter setting.

Controller and Router: Two Devices in One

The KNX IP Router also includes the capabilities of the KNX IP Controller. Even if this device combination is together in one piece of hardware, it appears in the ETS as two separate KNX devices. There are two programming buttons on the controller for startup.

Advantages:

  • KNX IP Router by combining the KNX IP Controller and KNX TP1 Module
  • ETHERNET access to TP1 network for ETS or visualization

WAGO ETS Plug-in/Product Database

The respective plug-ins for the KNX IP Controller, KNX TP1 Module and KNX IP Router do more than support device-specific configuration. For convenient use, they are designed so that you can apply already known and proven methods and procedures of the ETS.

Download the WAGO-ETS Plug-in manual

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