Echelon OpenLNS Commissioning Tool - Manual (Page 138)

122 Designing Networks
Start
Unicast?
All targets on
same subnet?
# of targets
< Z ?*
SCD_Unicast
Acknowledged service
Aliases for selector conflicts
Does not use broadcast
SCD_SubnetBcast
Repeated service (3 repeats)
Aliases for selector conflicts
Subnet broadcast
SCD_AliasUnicast
Acknowledged service
Alias multi-unicast
Does not use broadcast
SCD_Default
Repeated service (3 repeats)
Aliases for selector conflicts
Domain broadcast
Group available?
SCD_Default
Repeated service (3 repeats)
Aliases for selector conflicts
Does not use broadcast
* Z = 5 by default
No
No
No
No
Yes
Yes
Yes
Yes
These automatic SCD selection rules do not apply to message tag connections, fan-in
connections (where the hub is an input network variable), or connections in which you specify
a non-SCD for the connection description.
To modify the automatic SCD selection rules, follow these steps:
1. In the OpenLNS CT drawing, click Add-ins, point to OpenLNS CT, and then select OpenLNS
CT Options. The Network Properties dialog box opens.
2. Select Smart Connection Descriptions from the Options Category list.