Emerson Rosemount 2230, Справочное руководство

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58
Reference Manual
00809-0100-2230, Rev CA
Configuration and Operation
July 2017
Configuration and Operation
4.10 General block information
4.10.1 Modes
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.
Note
When an upstream block is set to OOS, this will impact the output status of all downstream blocks. The
figure below describes the hierarchy of blocks:
Resource
Block Transducer
Block Other function
blocks