Analog Input Block - Emerson Rosemount 5900S Series Reference Manual

Rosemount 5900S Series
C.2 ANALOG INPUT BLOCK
Figure C-1. Analog-Input Block
Figure C-2. Analog Input
Function Block Schematic
C-6
AI
OUT =The block output value and status
OUT_D =Discrete output that signals a selected
alarm condition
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. Table C-2 lists the AI block parameters and
their units of measure, descriptions, and index numbers.
Analog
Measurement
Access
HI_HI_LIM
Analog
HI_LIM
Meas.
LO_LO_LIM
LO_LIM
CHANNEL
ALARM_HYS
LOW_CUT
Convert
SIMULATE
L_TYPE
FIELD_VAL
OUT_SCALE
XD_SCALE
OUT_D
OUT
ALARM_TYPE
Alarm
Detection
Cutoff Filter PV
PV_FTIME
MODE
IO_OPTS
STATUS_OPTS
NOTES:
OUT = block output value and status.
OUT_D = discrete output that signals a selected alarm condition.
Appendix C. F
OUNDATION
Reference Manual
00809-0100-5900, Rev CA
June 2014
OUT_D
OUT
Status
Calc.
Fieldbus Block Information