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Technology Technik
BACnet protocol as client station Advantages Components used in the example include high
This approach enables a distributed availability control via AC500-HA redundant
When BACnet operates as a client, it means the architecture where multiple clients can pull PLC architecture for uninterrupted chiller
BACnet device or system is requesting data or data from shared servers. It also supports and HVAC operation. AC500 supports both
services from other BACnet devices (servers) scalability by allowing specialized applica- BACnet/IP and BACnet MSTP, ensuring
rather than acting as the central controller. tions (analytics, billing) to act as clients compatibility across cooling equipment and
without disrupting core control systems. systems in the data center. Direct sensor
This includes the following characteristics: connectivity is realized through Modbus TCP
Role in communication Practical example: data center chiller integrating temperature, flow, and other key
The client initiates request for information or management system. sensors for precise monitoring. Comprehensive
actions from BACnet servers (e.g. sensors, HVAC integration is realized through BACnet and
controllers, meters). Examples include A BACnet enabled PLC centrally manages cooling Modbus RTU (RS485) connecting to HVAC and
reading temperature from a sensor or writing capacity and continuously monitors sensor data building automation devices. AC500 integrated
a setpoint to an HVAC controller. to maintain ideal server room conditions. The condition monitoring system allows for instant
Use cases in data centers entire chiller system, even in complex setups reaction to anomalies like vibrations or signs
Energy monitoring: a BACnet client retrieves with integrated PID loops and multi-protocol of potential failures in critical equipment. Field
power consumption data from meters for data analysis for flow, level, and pressure can level application control – cooling towers, chilled
analytics. be controlled. water pumps etc. – is realized through BACnet-
Environmental control: requests real-time enabled variable speed- HVAC drives (VSDs), to
temperature and humidity data from HVAC Remote PLC I/Os can act as local smart avoid external gateways and overcomplexity.
systems. nodes, enabling fast and reliable decisions.
Integration with higher-level systems: acts as Flexible integration is supported by BACnet/IP Die Infrastruktur eines Rechenzentrums umfasst
a client to collect data for dashboards, and BACnet MSTP enabled PLCs and variable zahlreiche Hilfssysteme zur Unterstützung der
billing, or predictive analytics. speed drives (VSDs) controlling applications, Leistungsfähigkeit der IT-Ausrüstung. Industri-
Technical behavior for smooth connection with BMS and HVAC/ elle Prozesssysteme beinhalten daher schwere
The client implements BACnet services like cooling systems. BACnet MSTP and BACnet/IP Anlagen wie Wasserversorgungs- und Pumpen-
ReadProperty, WriteProperty, and Subscribe- are integrated over redundant Ethernet networks netze, Kälteanlagen-Netzwerke, raumlufttech-
COV (Change of Value). It communicates to ensure continuous operation of critical cooling nische Anlagen (AHUs), Feuerlöschpumpensys-
over BACnet/IP or BACnet MS/TP depending systems. teme usw.
on the network architecture.
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