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Reference Manual
00809-0200-4801, Rev BA
April 2007
Rosemount 3051S
3-2
DEVICE CAPABILITIES
Link Active Scheduler The Rosemount 3051S 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 3051S 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 as follows:
1. Access the Management Information Bose (MIB) for the 3051S.
2. To activate the LAS capability, write 0x02 to the
BOOT_OPERAT_FUNCTIONAL_CLASS object (Index 605). To
deactivate, write 0x01.
Restart the processor.
Capabilities Virtual Communication Relationship (VCRs)
There are a total of 20 VCRs. One is permanent and 19 are fully configurable
by the host system. Twenty-five link objects are available.
Host timer recommendations
T1 = 96000
T2 = 1920000
T3 = 480000
Block Execution times
Analog Input = 20 ms
PID = 25 ms
Arithmetic = 20 ms
Input Selection = 20 ms
Signal Characterizer = 20 ms
Integrator = 20 ms
Analog Output = 20 ms
Output Splitter = 20 ms
Multiple Analog Input = 20 ms
Control Selector = 20 ms
Network Parameter Value
Slot Time 6
Maximum Response Delay 4
Maximum Inactivity to Claim LAS Delay 47
Minimum Inter DLPDU Delay 7
Time Sync class 4 (1ms)
Maximum Scheduling Overhead 21
Per CLPDU PhL Overhead 4
Maximum Inter-channel Signal Skew 0
Required Number of Post-transmission-gab-ext Units 0
Required Number of Preamble-extension Units 1