BACnet/IP

BACnet (Building Automation Control Network) is a standardized, manufacturer-independent communication protocol for building automation. The protocol is used in HVAC, lighting control, security, and fire alarm applications.

As a BACnet building controller (B-BC), the CX8191 Embedded PC meets the following requirements:

• Certification according to BACnet standard ISO 16484-5, revision 14
• Support of the AS-B profile (extended functional range) according to AMEV BACnet 2017
• Integration of the BACnet protocol into the TwinCAT System Manager
• Newly developed library that can be used to create and change BACnet objects directly in the PLC runtime and to store the properties persistently
• All string encoding character sets defined in the BACnet standard (UTF8, USC2, USC2, ISO8859 ...) are supported

TF8020 BACnet supplement

The BACnet supplement TF8020 is pre-installed on the CX8191 in its delivered state. No further installations or keys are required. The TF8020 BACnet supplement can only be used via the X101/102 Ethernet interfaces.

Further information:
Supplement description for TF8020: https://www.beckhoff.com/en-en/products/automation/twincat/tfxxxx-twincat-3-functions/tf8xxx-industry-specific/tf8020.html

Adding the TF6100 OPC UA supplement

In contrast to the CX8091 predecessor device, the TF6100 OPC UA supplement is not pre-installed on the CX8191. OPC UA and other protocols such as Modbus/TCP can be activated and licensed later using the license manager.

Memory usage

Under certain circumstances, the RAM available on the CX8191 can be ‘eaten up’ by trend log objects. Check whether enough RAM is available for your application. Beckhoff recommends a maximum of 750 BACnet objects.

This is a guide value; the actual value can be higher or lower. It depends on the CPU's and RAM's load and on the BACnet objects used.