Emerson Rosemount 848T, Reference Manual, Page: 31 / 136

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Reference Manual
00809-0100-4697, Rev GA
Section 3: Configuration
November 2014
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.
Monitoring application with a single selection
Example: Average exhaust temperature of gas and turbine where there is a single alarm level for
all inputs.
1. Link the MAI outputs to the ISEL inputs.
2. Place the Multiple Analog Input (MAI) function block in OOS mode (set
MODE_BLK.TARGET to OOS).
3. Set CHANNEL= “channels 1 to 8.” Although the CHANNEL_X parameters remain
writable, CHANNEL_X can only be set = X when CHANNEL=1.
4. Set L_TYPE to direct or indirect.
5. Set XD_SCALE (transducer measurement scaling) to the appropriate upper and lower
range values, the appropriate sensor units, and display decimal point.
MAI
Function
Block
Out_1
Out_2
Out_3
Out_4
Out_5
Out_6
Out_7
Out_8
MAI
Function
Block
Out_1
Out_2
Out_3
Out_4
Out_5
Out_6
Out_7
Out_8
ISEL
Function
Block
IN_1
IN_2
IN_3
IN_4
IN_5
IN_6
IN_7
IN_8
Out
Out_D