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Reference Manual
00809-0200-4101, Rev AA
July 2008
Rosemount 2051
3-2
DEVICE CAPABILITIES
Link Active Scheduler The Rosemount 2051 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 2051 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.
Capabilities Block Execution times
Analog Input = 30 ms
PID = 45 ms
GENERAL BLOCK
INFORMATION
Modes
The Resource, Transducer, and all function blocks in the device have modes
of operation. These modes govern the operation of the block. Every block
supports both automatic (AUTO) and out of service (OOS) modes. Other
modes may also be supported.
Changing Modes
To change the operating mode, set the MODE_BLK.TARGET to the desired
mode. After a short delay, the parameter MODE_BLOCK.ACTUAL should
reflect the mode change if the block is operating properly.
Permitted Modes
It is possible to prevent unauthorized changes to the operating mode of a
block. To do this, configure MODE_BLOCK.PERMITTED to allow only the
desired operating modes. It is recommended to always select OOS as one of
the permitted modes.
Types of Modes
For the procedures described in this manual, it will be helpful to understand
the following modes:
AUTO
The functions performed by the block will execute. If the block has any
outputs, these will continue to update. This is typically the normal
operating mode.
Out of Service (OOS)
The functions performed by the block will not execute. If the block has any
outputs, these will typically not update and the status of any values passed
to downstream blocks will be “BAD”. To make some changes to the
configuration of the block, change the mode of the block to OOS. When
the changes are complete, change the mode back to AUTO.
MAN
In this mode, variables that are passed out of the block can be manually
set for testing or override purposes.