Emerson Rosemount 644 FOUNDATION Reference Manual page 59

Foundation Fieldbus Block Information
September 2018
Table B-3. Definitions of AI Function Block System Parameters
Index
Parameter Available values
no.
LO_LIM 30 Out_Scale
LO_LO_ALM 36 Not applicable
LO_LO_LIM 32 Out_Scale
LO_LO_PRI 31 0 – 15
LO_PRI 29 0 – 15
LOW_CUT 17 > = 0
Auto
MODE_BLK 05 Manual
Out of Service
OUT 08 Out_Scale
OUT_D 37 Discrete_State 1 – 16
OUT_SCALE 11 Any output range
PV 07 Not applicable
PV_FTIME 18 > = 0
SIMULATE 09 Not applicable
ST_REV 01 Not applicable
Propagate fault forward
Uncertain if Limited
STATUS_OPTS 14
Bad if Limited
Uncertain if Man Mode
STDDEV 39 0 – 100
STRATEGY 03 0 – 65535
TAG_DESC 02 32 text characters
UPDATE_EVT 20 Not applicable
XD_SCALE 10 Any sensor range
1. The host system may write over default values pre-configured by Rosemount.
2. Assume that when L_Type = Direct, the user configures Out_Scale which is equal to XD_Scale.
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Units
(2) (2)
Out_Scale
None
(2) (2)
Out_Scale
None
None
(2)
Out_Scale
None
(2) (2)
± 10% Out_Scale
None
All available
(2)
Out_Scale
Seconds
None
None
Percent
None
None
None
inH O (68 °F)
2
inHg (0 °C)
ftH O (68 °F)
2
mmH O (68 °F)
2
mmHg (0 °C)
psi
bar
mbar
g/cm 2
2
kg/cm
Pa
kPa
torr
atm
deg C
deg F
Default Read/Write
Not applicable Read and Write
Not applicable Read only
Not applicable Read and Write
1 Read and Write
1 Read and Write
0 Read and Write
Not applicable Read and Write
Not applicable Read and Write
Disabled Read and Write
none Read and Write
Not applicable Read only
0 Read and Write
Disable Read and Write
0 Read only
0 Read and Write
0 Read and Write
0 Read and Write
none Read and Write
Not applicable Read only
(1)
AI1 = deg C
AI2 = deg C
Reference Manual
00809-0400-4728, Rev CA
Description
The setting for the alarm limit used to detect the LO
alarm condition.
The LO LO alarm data, which includes a value of the
alarm, a timestamp of occurrence and the state of the
alarm.
The setting for the alarm limit used to detect the LO LO
alarm condition.
The priority of the LO LO alarm.
The priority of the LO alarm.
If percentage value of transducer input fails below this,
PV = 0.
The actual, target, permitted, and normal modes of the
block.
Target: The mode to "go to"
Actual: The mode the "block is currently in"
Permitted: Allowed modes that target may take on
Normal: Most common mode for target
The block output value and status.
Discrete output to indicate a selected alarm condition.
The high and low scale values, engineering units code,
and number of digits to the right of the decimal point
associated with OUT.
The process variable used in block execution.
The time constant of the first-order PV filter. It is the
time required for a 63% change in the IN value.
A group of data that contains the current transducer
value and status, the simulated transducer value and
status, and the enable/disable bit.
The revision level of the static data associated with the
function block. The revision value will be incremented
each time a static parameter value in the block is
changed.
The average absolute error between the PV and its
previous mean value over that evaluation time defined
by VAR_SCAN.
The strategy field can be used to identify grouping of
blocks. This data is not checked or processed by the
block.
The user description of the intended application of the
block.
This alert is generated by any change to the static data.
In all Rosemount devices the units of the transducer
block is forced to match the unit code.
Foundation Fieldbus Block Information