Emerson Rosemount 644 FOUNDATION, Reference Manual

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Foundation Fieldbus Block Information
53
Foundation Fieldbus Block Information
September 2018
Reference Manual
00809-0400-4728, Rev CA
LO_LIM 30 Out_Scale
(2)
Out_Scale
(2)
Not applicable Read and Write
The setting for the alarm limit used to detect the LO
alarm condition.
LO_LO_ALM 36 Not applicable None Not applicable Read only
The LO LO alarm data, which includes a value of the
alarm, a timestamp of occurrence and the state of the
alarm.
LO_LO_LIM 32 Out_Scale
(2)
Out_Scale
(2)
Not applicable Read and Write
The setting for the alarm limit used to detect the LO LO
alarm condition.
LO_LO_PRI 31 0 – 15 None 1 Read and Write The priority of the LO LO alarm.
LO_PRI 29 0 – 15 None 1 Read and Write The priority of the LO alarm.
LOW_CUT 17 > = 0 Out_Scale
(2)
0 Read and Write
If percentage value of transducer input fails below this,
PV = 0.
MODE_BLK 05
Auto
Manual
Out of Service
None Not applicable Read and Write
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
OUT 08 Out_Scale
(2)
± 10% Out_Scale
(2)
Not applicable Read and Write The block output value and status.
OUT_D 37 Discrete_State 1 – 16 None Disabled Read and Write Discrete output to indicate a selected alarm condition.
OUT_SCALE 11 Any output range All available none Read and Write
The high and low scale values, engineering units code,
and number of digits to the right of the decimal point
associated with OUT.
PV 07 Not applicable Out_Scale
(2)
Not applicable Read only The process variable used in block execution.
PV_FTIME 18 > = 0 Seconds 0 Read and Write
The time constant of the first-order PV filter. It is the
time required for a 63% change in the IN value.
SIMULATE 09 Not applicable None Disable Read and Write
A group of data that contains the current transducer
value and status, the simulated transducer value and
status, and the enable/disable bit.
ST_REV 01 Not applicable None 0 Read only
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.
STATUS_OPTS 14
Propagate fault forward
Uncertain if Limited
Bad if Limited
Uncertain if Man Mode
0 Read and Write
STDDEV 39 0 – 100 Percent 0 Read and Write
The average absolute error between the PV and its
previous mean value over that evaluation time defined
by VAR_SCAN.
STRATEGY 03 0 – 65535 None 0 Read and Write
The strategy field can be used to identify grouping of
blocks. This data is not checked or processed by the
block.
TAG_DESC 02 32 text characters None none Read and Write
The user description of the intended application of the
block.
UPDATE_EVT 20 Not applicable None Not applicable Read only This alert is generated by any change to the static data.
XD_SCALE 10 Any sensor range
inH
2
O (68 °F)
inHg (0 °C)
ftH
2
O (68 °F)
mmH
2
O (68 °F)
mmHg (0 °C)
psi
bar
mbar
g/cm
2
kg/cm
2
Pa
kPa
torr
atm
deg C
deg F
AI1
(1)
= deg C
AI2 = deg C
In all Rosemount devices the units of the transducer
block is forced to match the unit code.
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.
Table B-3. Definitions of AI Function Block System Parameters
Parameter
Index
no.
Available values Units Default Read/Write Description