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Fieldbus functionality
Types of modes
For the procedures described in this manual, it is 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.
MAN
In this mode, the output of the block can be manually overwritten
for testing purposes.
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 other blocks is "BAD". Before you
make 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.
Mode parameters
Mode parameters are used to change the block mode from one state
to another. There are four types of mode parameters: Target, Actual,
Permitted, and Normal.
The Target mode is the mode assigned to a block and is used to
change a block to a desired mode.
The Actual mode is the current mode of the block.
The Permitted mode lists the modes that are allowed for a block.
Setting the Permitted modes prevents unauthorized changes to the
operating mode of a block. To do this, configure the Block:Mode
Permitted parameter to allow only the desired operating modes. It is
recommended to always select OOS as one of the Permitted modes.
The Normal mode is the mode the block should be set to during normal
operation conditions.
Locate mode parameters
In the resource and transducer blocks, the mode parameters are
normally found in the Process menu. In all other function blocks, they
are found in the Common Config menu. The mode parameters are
also included in the All parameter list; see "Device blocks" on page 69.
You can view and edit the Target mode parameter by tapping the
MODE button in the menus.
67
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