6.7 Analog input block parameters
Three sets of parameters can be set in the analog input block for:
• Scaling of the input and output values
• Tuning of the outputs
• Setting of alarms
ParametersFor the NI_FBUS tool, these are to be found in the Saling, Tuning and Alarms folders.
Example: OUT value
scaling (0 – 2
15
= 32768)
# Parameter Entry Significance
1 L_TYPE INDIRECT Switches in
OUT_Scale
function
2 Out_SCALE…
_MIN
_MAX
_UNIT
_DEC
0
32768
1997
0
Param. expands:
lower range-value
upper range-value
code for units *
decimal point
positon
* Units selected from pull-down menu.
If the display and the OUT value of the analog input block are to provide the same value,
then the lower and upper limits of the XD_SCALE value during calibration or linearization
must be entered as the lower and upper limits of the OUT_SCALE value (default = 0%
and 100%).
Parameter Significance
XD_SCALE.....
XD_SCALE_MIN
XD_SCALE_MAX
XD_SCALE_UNIT
XD_SCALE_DEC
Scales the input from the transducer block (result shown in FIELD_VAL)
Comprises the lower and upper range-values, the code for the engineering units and
the number of figures to the right of the decimal point.
Is effective for L_TYPE = INDIRECT. Only of interest after a linearization when the
OUT value is to be different to the display value. Default 0% – 100%
OUT_SCALE.....
OUT_SCALE_MIN
OUT_SCALE_MAX
OUT_SCALE_UNIT
OUT_SCALE_DEC
Scales the output of the analog input block
Comprises the lower and upper range-values, the code for the engineering units and
the number of figures to the right of the decimal point.
Only of interest when the OUT value is to be different to the display value, see
example below. Default 0% – 100%.
L_TYPE
Sets the type of linearisation in the analog input block, for level:
DIRECT bypasses the XD_SCALE and OUT_SCALE functions
INDIRECT switches in the XD_SCALE and OUT_SCALE functions
PV_FTIME
Influences the time it takes for the output to react to a sudden change in level (63%
of steady-state value), see also output damping, Chapter 6.4.
ACK_OPTION
Sets the way in which alarms and warnings are to be acknowledged.
ALARM_HYS
Sets the hysteresis (in output engineering units) for all configured alarms.
A hystersis of e.g. 2% on a HI_HI_LIMIT of 95% would cause the alarm to activate
when the level reaches 95% and to deactivate when the level drops below 93%.
A hystersis of e.g. 2% on a LO_LO_LIMIT of 5% would cause the alarm to activate
when the level drops below 5% and to deactivate when the level rises to 7%.
HI_HI_PRI
The priority (1 – 15, ) of the HI_HI alarm
HI_HI_LIM
Sets the HI_HI alarm limit in output engineering units
HI_PRI
The priority (1 – 15) of the HI alarm
HI_LIM
Sets the HI advisory limit in output engineering units
LO_PRI
The priority (1 – 15) of the LO alarm
LO_LIM
Sets the LO advisory limit in output engineering units
LO_LO_PRI
The priority (1 – 15) of the LO_LO alarm
LO_LO_LIM
Sets the LO_LO alarm limit in output engineering units
PV
SV
AI-OUT
XD_SCALE
MIN
0
0
1
1
MIN
MAX
MAX
OUT_SCALE
PV: Primary Value
SV: Secondary Value
BA211Y45
Cerabar S FF 6 Level Measurement
Endress+Hauser 45
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