Device Description; Device Capabilities; Link Active Scheduler (Las); Capabilities - Emerson Rosemount 3051S Series Reference Manual

Configuration
October 2016
3.3

Device description

Before configuring the device, ensure the host has the appropriate Device Description file revision for
this device. The device descriptor can be found on FieldCommGroup.org. The initial release of the
Rosemount 3051S with F
3.4

Device capabilities

3.4.1

Link Active Scheduler (LAS)

The Rosemount 3051S can be designated to act as the backup LAS in the event that the LAS is
disconnected from the segment. As the backup LAS, the Rosemount 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 Base (MIB) for the Rosemount 3051S.
2. To activate the LAS capability, write 0x02 to the BOOT_OPERAT_FUNCTIONAL_CLASS object (Index
605). To deactivate, write 0x01.
3. Restart the processor.
3.4.2

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.
Network parameter
Slot Time
Maximum Response Delay
Maximum Inactivity to Claim LAS Delay
Minimum Inter DLPDU Delay
Time Sync class
Maximum Scheduling Overhead
Per CLPDU PhL Overhead
Maximum Inter-channel Signal Skew
Required Number of Post-transmission-gab-ext Units
Required Number of Preamble-extension Units
Host timer recommendations
T1 = 96000
T2 = 1920000
T3 = 480000
26
Fieldbus Protocol is device revision 20. This manual is for revision 23.
OUNDATION
Reference Manual
00809-0200-4801, Rev DA
Value
6
4
47
7
4 (1ms)
21
4
0
0
1
Configuration