Reference Manual
00809-0100-4377, Rev BA
September 2010
Rosemount 752
2-8
Link Active Scheduler
The 752 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 752 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 752.
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 752 is listed below. The
Rosemount 752 can have up to nine additional instantiated function blocks.
•
1 Proportional/Integral/Derivative Block (tag name PID_1600)
•
1 Input Selector Block (tag name ISEL_1700)
•
1 Signal Characterizer Block (tag name CHAR_1800)
•
1 Arithmetic Block (tag name ARITH_1900)
•
1 Integrator Block (tag name INTEG_2000)
The Rosemount 752 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 and LCD Transducer Block.
By reading the parameter “FREE_SPACE” in the Resource block you can
determine how many blocks you can instantiate. Each block that you
instantiate takes up 4.5573% of the “FREE_SPACE”.
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.
Summary of Contents for 752
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