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Reference Manual
00809-0100-2230, Rev BB
August 2014
4-23
Rosemount 2230
Section 4. Configuration and Operation
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 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.
Table 4-3. Address Ranges for
FOUNDATION fieldbus devices
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
Address range
(decimal)
Address range
(hexadecimal)
Allocation
0 through 15 00 through 0F Reserved.
16 through 247 10 through F7 Permanent devices.
Address range 16 - 247 is
subdivided into addresses that are
LAS capable (lower end) and not
LAS capable (upper end).
248 through 251 F8 through FB New or decommissioned devices
252 through 255 FC through FF Temporary (“visitor”) devices.
Example: 375/475 communicator.
Maximum number of VCR’s 38
Number of client and server VCR’s 20
Number of publisher VCR’s 20
Number of subscribers VCR’s 32
Number of source VCR’s 2
Number of sink VCR’s 0