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Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
3-4
6. Set the Deadband from 0 to 90%. This threshold is used to clear the
PV status.
7. Set Status Priority. This determines what happens when the specific
limit has been exceeded. No Alert - Ignores limit settings. Advisory -
Sets Advisory Plant Web Alert, but does not do anything with PV
status. Warning - Sets a Maintenance Plant Web Alert and sets PV
status to uncertain. Failure - Sets A Failure Plant Web Alert and sets
PV status to Bad.
8. Set mode to Enabled for specific sensor.
COMMON
CONFIGURATIONS FOR
HIGH DENSITY
APPLICATIONS
For the application to work properly, configure the links between the function
blocks and schedule the order of their execution. The Graphical User
Interface (GUI) provided by the F
OUNDATION fieldbus host or configuration tool
will allow easy configuration.
The measurement strategies shown in this section represent some of the
common types of configurations available in the 848T. Although the
appearance of the GUI screens will vary from host to host, the configuration
logic is the same.
NOTE
Please ensure that the host system or configuration tool is properly configured
before downloading the transmitter configuration. If configured improperly, the
F
OUNDATION fieldbus host or configuration tool could overwrite the default
transmitter configuration.
Typical Profiling Application
Example: Distillation column temperature profile where all channels have the
same sensor units (°C, °F, etc.).
1. Place the Multiple Analog Input (MAI) function block in OOS mode
(set MODE_BLK.TARGET to OOS).
2. Set CHANNEL= “channels 1 to 8.” Although the CHANNEL_X
parameters remain writable, CHANNEL_X can only be set = X when
CHANNEL=1.
3. Set L_TYPE to direct or indirect.
4. Set XD_SCALE (transducer measurement scaling) to the appropriate
upper and lower range values, the appropriate sensor units, and
display decimal point.
5. Set OUT_SCALE (MAI output scaling) to the appropriate upper and
lower range values, the appropriate sensor units, and display decimal
point.
6. Place the MAI Function Block in auto mode.
7. Verify that the function blocks are scheduled.
MAI
Function
Block
Out_1
Out_2
Out_3
Out_4
Out_5
Out_6
Out_7
Out_8