Control high-performing buildings with DESIGO PXC4 and PXC5 controllers

Your turn with PXC4 and PXC5.

Control high-performing buildings with the Desigo PXC controllers
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A new era

Take the next step in building automation control

The new Desigo PXC4 and PXC5 controllers allow you to transform buildings into high-performing buildings. Discover how you can enter a new era of automation control. It’s your turn!

Tackle your challenges with a new generation of controllers

There are many challenges for high-performing buildings that can be mastered with the help of the new Desigo PXC4 and PXC5 controllers. These buildings need to intelligently connect field devices, enable quick and easy engineering, be both open and secure at the same time, and provide all the information necessary to optimally manage a building. This calls for a new generation of controllers. It’s time for Desigo PXC4 and Desigo PXC5 controllers – the first of a new range of building automation controllers that expand and strengthen the Desigo system.

Portfolio at a glance

Explore the Desigo PXC4 and PXC5 controllers

The new generation of Desigo automation controllers consists of the Desigo PXC4 for HVAC plants and the Desigo PXC5 for system functions and integration. Both offer a wide range of benefits for automating small to medium-sized buildings.

Desigo PXC4 BACnet HVAC automation controller

The Desigo PXC4 controller is designed as a compact device with 16 onboard I/Os that can be expanded to a maximum of 40 IOs with additional TX-I/O modules. TX-I/O modules can be directly connected or installed on another location by island bus. The PXC4 has an integrated power supply for up to 4 TX-I/O modules and an RS485 port used for Modbus RTU. You can add as many devices as you like, either on RTU or TCP, up to a limit of 40 Modbus data points. The hardware is ready for future connection of KNX devices by simply installing a firmware update. 


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System controller

The PXC5 is a freely programmable controller used for BACnet system-level functions like alarm routing, system-wide scheduling and trending, and device supervision. It also comes with a web interface for generic datapoint commanding. Two RS485 ports can be configured as either BACnet MS/TP or Modbus RTU, and Modbus TCP devices can also be integrated. Integration of up to 500 Modbus data points is included. The hardware is ready for future connection of KNX and Mbus devices by simply installing a firmware update.


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Features and functionalities for the future of building automation

The Desigo PXC4 and PXC5 controllers bring a broad range of new functionalities.

Intuitive engineering

Our Desigo engineering framework lets you get things done better, easier, and faster. ABT Site is the engineering tool for the end-to-end engineering and commissioning of Desigo PXC4 and Desigo PXC5. It’s easy to learn and to train, so you can start working with it in just a few minutes. ABT Site also comes with cloud connectivity that uses the available internet connection of a PC or laptop. A standard library provides many function blocks that save lots of time during engineering. In addition, you can expand it with your own customizations. ABT Go is a mobile app that also offers on-site efficiency, especially during installation, commissioning, and maintenance.

Open by design

Both controllers are freely programmable to meet the specific requirements of any project. Their housing size is also optimized to reduce their footprint in the cabinet. Despite the compact size, they come with plenty of I/Os and integration capabilities that can be easily extended to meet the needs of specific projects. Regardless of what protocol you choose to integrate, the workflow remains consistent. The Desigo PXC4.E controller additionally comes with integrated Modbus RTU and TCP interfaces to intelligently connect field devices.

Easy access

PXC4 and PXC5 can create their own hotspot to allow wireless access for ABT Site and ABT Go engineering and commissioning. The hotspot can also be used to access the built-in web interface. Remote operation and engineering of the system can be performed via cloud access*. Remote functionalities will allow both controllers to benefit from current and future cloud applications. 


*subject to regional availability and a valid subscription

Security in mind

Advanced connectivity calls for even higher security. That’s why the controllers provide encrypted communication with the embedded web interface, certificate handling, and signed firmware. The local device hotspot can be permanently disabled or automatically deactivated when not in use. They come with a password protection policy and system hardening with penetration tests, and they’re prepared for BACnet Secure Connect.


Download the BACnet Secure Connect white paper

Discover what the PXC can do for you

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Desigo Engineering Framework

Engineer high-performing buildings

A single framework for maximum efficiency

It’s the perfect match for the Desigo PXC4 and PXC5 controllers: The Desigo Engineering Framework enables you to realize high-performing buildings. It allows to plan, engineer, install, commission, and operate highly reliable and efficient building automation systems.

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Digital offerings that get you up to speed

Get the most out of the Desigo PXC4 and PXC5 controllers with our free digital offerings in various formats.

Watch these short tutorial videos and learn how you can turn the engineering of your building automation system into a child's play.

Our Webinars give you the information that you need on the key features and benefits of our building automation technologies. Register for free and enjoy the recordings.

Are you interested in learning how to work with your Desigo PXC4 and PXC5 controllers comfortably in your office? Then don’t hesitate to watch our training videos online. Here you’ll find recorded lectures and demonstration videos. 

In our training program, you’ll learn how to safely and efficiently work with Siemens products and prepare you for a subsequent certification as a Siemens system partner. Advanced trainings provide you with all the knowledge you need, to stay successful as a professional.


We are looking forward to your attendance!

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For additional information simply contact your local Siemens department by e-mail:


Now it's your turn!

Discuss your project with a certified partner of Siemens.

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Desigo – the state-of-the-art building automation system

The Desigo building automation system from Siemens is a highly flexible and scalable offering. It helps building owners to increase productivity, health and happiness besides keeping users safe and secure. Discover the full scope of benefits and functionalities for your use case.

Downloads & Support

Downloads, tools, and global customer support

Download brochures, catalogs, manuals, and order documentation with more details on the Desigo controller portfolio here.

The most flexible and scalable plant automation

The flexible, scalable, and open controllers in our Desigo portfolio satisfy all building and application needs. They can be easily adapted to future changes and offer the highest reliability, which ensures maximum value. 



The direct way to your Desigo controller contact

The availability of certain controllers may vary depending on your region. Do you have questions about our Desigo controller portfolio, or do you want to discuss specific challenges with our experts? Contact our regional offices – we’re looking forward to hearing from you!