Link Active Scheduler (Las); Capabilities - Emerson Rosemount 3144P Reference Manual

Reference Manual
00809-0100-4021
Other types of modes
Other types of modes are Cas, RCas, ROut, IMan, and LO. Some of these may be supported
by different function blocks in the 644. For more information, see the
Reference
Note
When an upstream block is set to OOS, this will impact the output status of all
downstream blocks. The figure below depicts the hierarchy of blocks:
4.6

Link Active Scheduler (LAS)

The Rosemount 3144P can be designated to act as the backup LAS in the event that the
designated LAS is disconnected from the segment. As the backup LAS, the transmitter 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:
Procedure
1. Access the Management Information Base (MIB) for the transmitter. To activate the
2. Restart the device.
4.7

Capabilities

4.7.1 Virtual Communication Relationship (VCRs)
There are 20 VCRs, where one is permanent and 19 are fully configurable by the host
system. Also, 30 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
Reference Manual
Manual.
LAS capability, write 0x02 to the BOOT_OPERAT_FUNCTIONAL_CLASS object (Index
605). To deactivate, write 0x01.
F Fieldbus Configuration
OUNDATION
December 2019
Function Block
Value
8
2
32
8
4 (1 ms)
10
4
0
159