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Reference Manual
00809-0100-2230, Rev CA
4.9
Device capabilities
4.9.1
Link Active Scheduler
The Rosemount 2230 can be designated to act as the backup Link Active Scheduler (LAS) in the event
that the LAS is disconnected from the segment. As the backup LAS, the Rosemount 2230 will take over
the management of communications until the host is restored.
The host system may provide a configuration tool specifically designed to designate a particular device
as a backup LAS. Otherwise, this can be configured manually.
4.9.2
Device addressing
Foundation fieldbus devices use addresses divided into four sub ranges as shown in
Table 4-3. Address Ranges for F
Address range
(decimal)
0 through 15
16 through 247
248 through 251
252 through 255
The Link Active Scheduler device (LAS device) probes a list of addresses to allow devices to come online
during normal operation. The LAS can "skip" probing certain addresses in the range to speed up how long
it takes to detect new devices on the bus.
4.9.3
Capabilities
Virtual Communication Relationship (VCRs)
Table 4-4. VCR's
Item
Maximum number of VCR's
Number of client and server VCR's
Number of publisher VCR's
Number of subscribers VCR's
Number of source VCR's
Number of sink VCR's
Configuration and Operation
fieldbus devices
OUNDATION
Address range
(hexadecimal)
00 through 0F
10 through F7
F8 through FB
FC through FF
Number of VCR's
38
20
20
32
2
0
Configuration and Operation
Allocation
Reserved.
Permanent devices.
Address range 16 - 247 is subdivided into addresses
that are LAS capable (lower end) and not LAS capable
(upper end).
New or decommissioned devices
Temporary ("visitor") devices. Example: 375/475
Field Communicator.
July 2017
Table
4-3.
57
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