Become a partner
DEOS composing Portfolio

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.


Discover our range of services for our partners, customers and interested parties.


We make our partners more successful. You too can find out why you should work with us.

Contact us

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

Products DDC controller OPEN 4100 EMS & OPEN 3100 EMS

OPEN 4100 EMS & OPEN 3100 EMS

Our DEOS controllers for maximum safety with redundancy functions. The OPEN 4100 EMS (BACnet) and the OPEN 3100 EMS (proprietary) are particularly well suited for critical infrastructure due to their high operational reliability.

Product highlights

With the OPEN 4100 EMS and OPEN 3100 EMS, you benefit from numerous features and advantages. Discover them now.

  • Maximum operational safety

    Redundancy solutions such as CAN-HSB safety ring bus or hot standby controller ensure maximum operational reliability.

  • Made in Germany

    Guaranteed high quality and durability through production on our own innovative SMD production line.

  • Free programmable

    Ensures maximum flexibility in your projects.

  • 2 Ethernet Ports

    Enable easy on-site maintenance without communication outages and serial (daisy chain) cabling of controllers reduces cabling overhead.

  • Time-saving programming

    Save up to 90% of your plant programming time with DEOS libraries.

  • Onboard-GLT/-MBE

    Equipped with integrated HTML5 web server OPENview for plant visualization.

  • IT security

    Highest possible operational security through redundant system design, HTTPS and integrated firewall.

  • Top-hat rail mounting

    The top-hat rail mounting enables easy integration into the control cabinet on site.

  • Certified

    Multiple certified according to international standards such as AMEV / BTL.

  • IoT- & Cloud-Ready

    Ready to use the DEOS GLT OPENweb Cloud and the pro.Building Suite IoT platform.

  • Scalable

    Simple expansion of the controllers by means of IO modules.

  • Controller at a glance

    The OPEN 4100 EMS BACnet controller and the OPEN 3100 EMS controller (proprietary) are among the more powerful controllers in the DEOS product portfolio, with up to 4,000 physical data points. These are freely programmable or programmable with our time-saving libraries and have been developed for the realization of demanding building automation projects (GA projects) with high demands on operational safety – 100% made in Germany.

    In addition to the standard C1 variant, to which up to 99 OPEN IO modules can be connected, the two automation stations are also available as a C2 variant. This supports the connection of up to 198 OPEN IO modules and, as a hot standby controller, is part of our redundancy solution, which ensures the highest possible operational reliability in your project.


    Redundancy enables maximum operational reliability

    Redundant hot standby controller

    For the highest possible operational reliability, you can also use the OPEN 4100 EMS / OPEN 3100 EMS as a redundant hot standby controller. For this purpose, two controllers are operated on one CAN bus. The Primary Controller is responsible for the control and regulation tasks. On the other hand, the secondary controller remains in standby mode and automatically takes over the control and regulation of the building services equipment in the event of a primary controller failure (no physical switching of the CAN bus required).

    Redundancy through CAN-HSB safety ring bus

    The CAN-HSB safety ring bus (High Safety Bus) offers additional safety functions compared to the simple CAN bus: In case of interruption of a CAN bus, the complete system remains in operation due to redundant control. The narrowing down diagnosis is done automatically and a detailed report shows the user via which CAN segment the connected IO modules can still be reached. This allows you to detect errors and correct them as quickly as possible.

    Interest aroused?

    Then contact us! We’re glad to help.