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Reference Manual
00809-0100-4696, Rev AA
September 2004
3-3
Rosemount 848L
Link Active Scheduler The Rosemount 848L 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 848L 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
848L.
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.
Block Instantiation Rosemount devices are pre-configured with function blocks at the factory, the
default permanent configuration for the Rosemount 848L is listed below. The
Rosemount 848L can have one additional instantiated function block.
• 8 Discrete Input Blocks
• 4 Discrete Output Blocks
• Multiple Discrete Input Block
• Multiple Discrete Output Block
The Rosemount 848L supports the use of Function Block Instantiation. When
a device supports block instantiation, the number of blocks and block types
can be defined to match specific application needs.The number of blocks that
can be instantiated is only limited by the amount of memory within the device
and the block types that are supported by the device. Instantiation does not
apply to standard device blocks like the Resource, I/O Transducer, and Logic
Transducer Block.
Block instantiation is done by the host control system or configuration tool, but
not all hosts are required to implement this functionality. Please refer to your
specific host or configuration tool manual for more information.