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Discover our extensive product portfolio for building automation. From the BACnet/SC controller to the B-AWS certified building control system OPENweb, you will find the right product for your individual project.


Discover our practical solutions for building automation. Benefit from energy monitoring, remote access and site networking, and many other solutions.


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Here you will find practical information and tips on classic building automation and modern smart buildings in a high-quality format.

Building management system OPENweb

Our web-based and B-AWS certified BACnet building control system (BMS) OPENweb specializes in monitoring and controlling HVAC systems as well as zone and room control in the building – locally on site or as a BMS in the cloud.

Product highlights

With OPENweb you benefit from numerous features and advantages. Discover them now.

  • Simple operation

    With OPENweb ‘s HTML 5 Web Client you access your assets via a browser.

  • Certified B-AWS

    OPENweb is our B-AWS certified BACnet building control system.

  • Market-oriented in-house development

    Joint development with our system partners and the requirements of the market.

  • Clear trend display

    Graphical recording and display of trend data and its historization.

  • Individually scalable

    From the smallest project as a cloud BMS to large projects, OPENweb covers the entire range.

  • Cloud BMS

    Also available from 100 data points in the cloud subscription as Software as a Service – building automation has never been so easy.

  • Modularly expandable

    OPENweb can be individually extended by, for example, interfaces to hotel booking systems (Fidelio).

  • Intuitive message management

    With the intuitive alarm and message management and the Secure AlarmApp, you can react flexibly and quickly to system malfunctions.

  • Quick installation

    Our BMS OPENweb can be installed and ready for operation in less than one hour. This is only available at DEOS.

  • Graphical visualisation

    The graphical visualization facilitates the operation of your building services equipment.

  • Energy efficient monitoring & control of your buildings

    With our B-AWS certified BACnet building control system (BMS) OPENweb, you always have an overview of your building technology systems. For this purpose, an HTML 5 web client (operation via browsers such as Mozilla Firefox, Google Chrome, etc.), a desktop client and an app are available. In addition, our intelligent control strategy ensures operation at the energetic optimum. Plant faults and alarms are communicated directly via the internal Event Control Center (ECC) and can be sent to your service staff via the DEOS Secure AlarmApp. This allows you to act quickly and efficiently.

    From secure remote maintenance and simple system integration to economical site networking of your properties – OPENweb is the right BMS for your individual projects and requirements.

    OPENweb features at a glance

    Individually scalable

    In offices, hotels, schools or leisure pools – thanks to OPENweb ‘s scalability, the software is suitable for almost any project. From the smallest application to large and complex projects with redundancy requirements. Decide for yourself whether OPENweb should be implemented locally on your computer or as a modern cloud solution. Thanks to the cloud solution, even small building automation projects with 100 data points or more benefit from a fully comprehensive BMS. Our BMS can also be quickly and easily expanded to a cloud BMS at a later date. This guarantees investment security, reduces internal maintenance costs and also means that operating personnel do not need to be retrained in the system.

    Time-saving plant graphics

    The graphics for visualizing your plant are created fully automatically during programming with the OPEN FXL programming tool and the DEOS libraries for all terminals. This saves you important staff resources and ensures a uniform presentation on all end devices and platforms. Subsequently, the generated plant graphics can be retrieved via the integrated OPENview web server on the controller or via our BACnet BMS OPENweb. Plant programming with DEOS is that easy!

    Flexible integration

    OPENweb stands for flexibility: It integrates plants and systems from different manufacturers and guarantees communication between different bus systems and products with standardized protocols and interfaces – even from third-party manufacturers. Use our BMS easily and without problems in existing plants (retrofit) or in new buildings. We can also meet individual implementations on request.

    Extensive trend management

    With the OPENweb trend management you always keep an eye on your investment and can act quickly in case of irregularities. There are no limits to what you can do: Define the data points as well as the query intervals according to your needs and simplify your daily work by compiling frequently used trend data in recipes and loading them simply with a click.

    Innovative alarm management

    The innovative alarm management makes OPENweb so special: Plant malfunctions and alarms are communicated directly via the internal Event Control Center and can be automatically received as a push message by your service staff via the DEOS Secure AlarmApp. Coordinate your service calls more efficiently than ever and access app features such as fault message assignment, technician chat or service history. HVAC services have never been so easy!

    Building control is that easy with OPENwebCloud!

    Eliminate the need for expensive hardware for your on-site BMS server, tedious installation and update procedures, or additional staffing to maintain your BMS software. With OPENwebCloud you not only rely on a user-friendly BMS but also on Software as a Service. We deliver your BMS on our DEOS high performance servers (located in Germany), keep OPENweb always up to date and are always available with our IT experts to support and advise you. Go for manageable monthly payments instead of large investments. It doesn’t matter how small or large your HVAC system is: planning is done on a data point basis starting at 100 data points. BACnet and physical data points are treated in the same way. This way, even small plants can benefit from the advantages of a full-fledged BMS like OPENweb.

    In addition to our worry-free service, we also offer you exclusive benefits in the cloud version: You receive our modular extensions such as the OPENweb Event Control Center or the Event Server free of charge in addition to the cloud subscription. Thus, you can enjoy the full functionality of OPENweb.

    OPENwebCloud – this is how we make the future!

    Which operation suits you? You have the free choice!

    The graphical operating concept of our BMS is one thing above all: simple! Whether with a PC, smartphone or tablet – you operate OPENweb as flexibly as you wish. The graphic display of the system makes operation child’s play and even more intuitive. This way, even employees without prior knowledge can monitor and control the room and system parameters.

    Web Client

    With the Web Client of OPENweb you can monitor and control your plants platform independent (Android/iOS/Windows/…) thanks to HTML 5 and a web browser. Access your system from any device without installing additional software. This way you remain maximally flexible.

    Mobile app

    Optimized for Android smartphones and tablets, HVAC system monitoring and control is enabled via our OPENweb app and OPENview app – whether you are in your own building or on the road.

    Desktop client

    With the OPENweb ControlPanel, your building control system can be fully and graphically operated and configured from your PC. You can easily access all parameters of your heating, ventilation, air conditioning and lighting technology. The Desktop Client is mainly used to configure the installations.

    OPENweb in detail

    Scope of functions

    Event Control Center

    The Event Control Center (ECC) is the central interface for displaying and editing messages (alarms and events). In addition to the temporal recording of acknowledgements, events such as alarms and messages can be edited and filtered.

    • Management, display and processing of messages (alarms and events)
    • Comprehensive information – proprietary and BACnet
    • Display of existing and historical events in separate views

    Trend management

    • Optimise system settings during operation with live trending
    • Wide range of tools such as axis parameterisation, CSV export or report printing
    • Unlimited number of trend curves per diagram
    • Free and individual selection of trend data from different controllers
    • Automatic CSV export by e-mail
    • Historisation of trend data in case of value changes
    • Freely adjustable query interval of each data point
    • Automatic connection set-up to decentralised OPEN EMS

    Graphic system visualisation

    • Representation of plant graphics can be individually designed
    • Process-dependent animations of the graphic objects
    • Creation of own BACnet graphics libraries
    • Cross-project use of own libraries through export and import functions
    • Variety of supported image formats: Vector graphics WMF, SVG as well as JPG, PNG, GIF, animated GIF
    • Display of system graphics with graphic objects for visualisation of target, actual and event data as images, sliders, columns, texts, lines, colour objects

    Communication driver

    • Proprietary TCP/IP Connection on Demand (Intranet or Internet)
    • Proprietary TCP/IP Connection on Demand (Intranet or Internet)
    • Dial-up (e.g. via modem)
    • BACnet/IP (extension module)
    • LDAP (for connection to Active Directory systems)


    • Automatic historising of events and messages


    ECC configuration

    User-specific design of the Event Control Centre

    • Number of views, filters, table columns, acoustic signalling, authorisations etc. can be individualised

    Trend & Event APIs

    Connection of third-party systems to OPENweb via standardised APIs (OpenAPI)

    • Trend API
      • Reading of all trend data points from proprietary controllers and BACnet devices
      • Various endpoints e.g. for querying samples per trend data point, trend data points per controller etc.
    • Event API
      • Reading of all event information, e.g. for use in ERP systems
      • Writing comments and acknowledging events


    • Bidirectional data exchange with external systems via integrated SQL server
    • Data exchange via ODBC interface
    • Data points from different projects can be freely selected
    • Update interval for each data point individually adjustable

    BACnet/SC Hub

    • Latest BACnet protocol for secure communication
    • OPENweb can be used as BACnet/SC Primary Hub or BACnet/SC Failover Hub
    • Not required for OPENweb to be used as a BACnet/SC Node

    FIAS / Fidelio

    • Connection (via BACnet according to ISO 16484-5) of the Fidelio hotel booking system
    • Provision of information on room occupancy (check-in, check-out, etc.) as BACnet objects
    • One BACnet object (multistate) is used per room

    Trend authorisation

    • Combining controllers and BACnet devices into authorisation groups
    • Users who are assigned to an authorisation group only have access to the trend data of the controllers and BACnet devices in this group

    Interest aroused?

    Then contact us! We’re glad to help.