BACnet Driver

By default, a Desigo CC project has no BACnet driver added. For procedures about BACnet drivers, including how to add one, see BACnet Driver.

Sharing a Network Interface Card

If you create more than one BACnet driver, the drivers can be assigned to the same Network Interface Card (NIC). To avoid configuration conflicts, apply the following guidelines to the physical port configuration in the BT BACnet Stack Config expander:

• The Network Number of each Physical Port must be unique.
• The IP Address and UDP Port (default is 47808) of each Physical Port must be unique. This means that the Physical Ports must have a different IP address or a different UDP port. For instance, if two drivers are assigned to the same NIC, you can use the value 47809 for the UDP port of the Physical Port of the second driver.

Using Separate Network Interface Cards for Each Driver

If you create more than one BACnet driver, the drivers can also be assigned to separate NICs. To avoid configuration conflicts, apply the following guidelines to the Physical Port configuration in the BT BACnet Stack Config expander:

• The Network Number of each physical port must be unique.
• The IP Address of each physical port must be unique. This means that the physical ports must have a different IP address.

System Limitations

The following limitations apply to the Management System Server:

• Maximum number of FEPs: 5
• Maximum number of drivers per FEP: 40
• Maximum number of drivers per Server:
  Local = 20 (in a Server)
  Total = 80 (split between the local Server and a minimum of 2 FEPs)

NOTE: The default for the maximum number of BACnet drivers is 10. If required, you can increase the number to 40 in the BACnet Driver Object Model. In all cases, the system limits for the maximum number of drivers apply. See System Limits and Hardware Requirements, A6V12072883_en_a_(current revision).

Considerations