Parameter - Emerson Oxymitter 5000 Instruction Manual

Instruction Manual
IM-106-350, Rev 2.2
July 2008
Appendix D
http://www.raihome.com
Analog Input (AI) Function Block
Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-3
Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-4
Signal Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-5
Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-5
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-6
Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-6
Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-7
Advanced Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-8
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-8
Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-9
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page D-13
OUT
OUT _D
The Analog Input (AI) function block processes field device measurements
and makes them available to other function blocks. The output value from the
AI block is in engineering units and contains a status indicating the quality of
the measurement. The measuring device may have several measurements or
derived values available in different channels. Use the channel number to
define the variable that the AI block processes.
The AI block supports alarming, signal scaling, signal filtering, signal status
calculation, mode control, and simulation. In Automatic mode, the block's
output parameter (OUT) reflects the process variable (PV) value and status.
In Manual mode, OUT may be set manually. The Manual mode is reflected on
the output status. A discrete output (OUT_D) is provided to indicate whether a
selected alarm condition is active. Alarm detection is based on the OUT value
and user specified alarm limits. Figure D-1 illustrates the internal components
of the AI function block, and Table D-1 lists the AI block parameters and their
units of measure, descriptions, and index numbers.
OUT_D
AI
OUT
= The block output value and status
= Discrete output that signals a selected
alarm condition
Oxymitter 5000