Issue
BBMD and BBDT Enterprise Server or Automation Server
Product Line
EcoStruxure Building Operation
Environment
- Building Operation Enterprise Server and Automation Server
- BBMD (BACnet Broadcast Management Device)
- IP subnet, IP router
Cause
Clarification for both BACnet Broadcast Management Device (BBMD) and BACnet Broadcast Device Table (BBDT) when used within Building Operation servers.
Resolution
A BBMD is needed when communicating to BACnet devices on another IP segment/subnet (across IP routers). One BBMD is required per subnet; this is because IP routers block broadcast packets and BACnet uses broadcast packets to initiate and maintain communications.
Continuum CyberStation (below) or bCX4 can act as a BBMD.
A BBMD can be created in a Building Operation Enterprise Server or Automation Server.
The BBMD on the other subnet should be as below
Now all the BACnet devices should be visible on both subnets
Notes
- No more than a single BBMD should be created on each subnet for each IP port used.
- Additional information about BBMDs is available on WebHelp The Teach and Learn commands are useful for larger networks with multiple BBMDs
