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BACnet Insight

BACnet & BACtwin – One Language for

all Building Services Engineering Trades

BACnet & BACtwin – Eine Sprache

für alle TGA-Gewerke

Non-residential buildings with extensive technical buil- With technical monitoring,
ding equipment require building automation (BA). With experts continuously
analyze all building
increasing complexity and digitalization, interopera- services data.
bility has become a key challenge: BA systems often This enables them to
evaluate the performance
integrate components from different manufacturers,
of the building even over
using different communication standards. In practice, long periods of use.
this can prevent seamless interaction between trades. Mit dem Technischen
Monitoring analysieren
Nicht-Wohngebäude mit umfangreicher Gebäudeaus-
die Sachverständigen alle
rüstung müssen über eine Gebäudeautomation (GA) TGA-Daten kontinuierlich.
verfügen. In Zeiten zunehmender Komplexität und Dadurch können sie
die Performance des
Digitalisierung ist dabei die Interoperabilität eine zen- Gebäudes auch über
trale Herausforderung: In der GA werden oft Kom- lange Nutzungszeiträume
ponenten diverser Hersteller zusammengeführt, die bewerten. © TÜV SÜD
unterschiedliche Kommunikationsstandards nutzen.
Das kann in der Praxis dazu führen, dass die Gewerke
nicht nahtlos zusammenarbeiten.

This is why TÜV SÜD has further developed its BACnet- Where does the building management system (BMS) ard test rules. Where required, these rules are supple-
compatible DataBox into IntelliBridge. This enables oper- stumble? mented with project-specific target values from require-
ators to now have BA functions tested and monitored in ments documents, functional descriptions, operating
a targeted manner. Technical monitoring can reveal BA malfunctions before instructions, and AMEV specifications (Working Group
their consequences become noticeable. For monitoring for Mechanical and Electrical Engineering in State and
When efficiency losses start with configuration details to work reliably, however, all components must “speak” Municipal Administrations). Results are visualized live for
a common language. If transmission formats are incom- customers in a performance dashboard.
In an office building, the ventilation fans continue run- patible, the BA system may not even recognize a fault
ning for several hours after work, despite a sched- message coming from connected equipment. Greater transparency with the digital twin
uled night shutdown. How can that happen? The root
cause is often a configuration issue in the BA system: BACnet (Building Automation and Control Networks), BACnet-based monitoring becomes even more effec-
the switch-off command is not executed correctly. The defined in DIN EN ISO 16484-5, is the recognized inter- tive when integrated into a “Digital Twin in Build-
unnecessary runtime increases electricity costs and national standard for building automation. It enables ing Automation with BACnet” (AMEV BACtwin). This
accelerates wear and tear. cross-system, manufacturer-neutral communication allows experts to identify and verify each data point
across building services trades and forms a solid basis down to its detailed function.
A similar case occurs when heating and cooling are con- for efficient technical monitoring. This is precisely what
trolled by an outdoor temperature sensor installed on a TÜV SÜD’s IntelliBridge builds on For new construction projects, it is advisable to consider
façade with strong solar exposure. The readings become AMEV Recommendation No. 174 “BACtwin in Public
distorted. As a result, the building may not be heated suf- IntelliBridge: from data points to actionable insights Buildings” as early as the planning phase. Building own-
ficiently, or it is even actively cooled. That raises energy ers can then specify in tenders that only service provid-
consumption and impacts occupant comfort. TÜV SÜD IntelliBridge records relevant data points, such ers and systems meeting these requirements – and with
as measured values and operating states of system com- proven qualification – will be used.
Buildings account for a significant share of global final ponents. Compared to its predecessor, IntelliBridge is
energy consumption, and non-residential buildings designed for higher performance. It also places stronger New centralized building automation
represent an even larger portion. This makes efficient emphasis on OT security requirements, a necessity given
building services operation all the more important. At the growing convergence of IT and OT systems in build- IntelliBridge is already being used at more than 1,000
the same time, modern buildings feature more units, ing services engineering. TÜV SÜD locations worldwide – among them the new
assemblies, and systems and therefore more data building “Algorithmus”, commissioned by TÜV SÜD itself.
points: information provided by sensors and actuators in Data is transmitted automatically and assessed by TÜV In the pre-audit, the high-tech property achieved a com-
defined operating states that must be processed correctly. SÜD experts using comprehensive, industry-stand- pliance level of 89.3%, the highest rating level of the

54 BACnet Europe Journal 44 03/26