VEGA VEGABAR 53 Foundation Fieldbus - Manuale (Pagina 55)

55
10 Appendice
VEGABAR 53 • Foundation Fieldbus
36724-IT
-130321
t
i
Simulat
e
ALARMS
Out PV
FIELD-VALUE
Mode & Status PVF-TIME LO
W
-C
UT
O
FF
L-TYP
E
OUT-SCALE PV-SCALE DIRECT
INDIRECT
INDIRECT
SQRT
bar % Lin%
Primary
Value
Secondary
Value 1
Secondary
Value 2
Sensor mounting
correction
AI 2
AI 3
AI 1
TB
Temperature
Sensor_Value
Linearization adjustment
Channel = 1: Primary Value
Channel = 2: Secondary Value 1
Channel = 3: Secondary Value 2
Channel = 4: Temperature
Figura 28: Transducer Block VEGABAR 53
TB Transducer Block
AI Function Block (AI =Analogue Input)
Diagramma di taratura
La seguente figura illustra la funzione di taratura:
Secondary_value_2
scale_in_0 scale_in_100 Sensor_value
0 %
100 %
bar
0,500 -0,500
0 % 100 %
scale_in_100 scale_in_0
Figura 29: Taratura VEGABAR 53
Lista dei parametri
La seguente lista contiene i principali parametri e il loro significato:
•
primary_value
– Process Value after min/max-adjustment and linearization. Selected as input to AIFB by setting
'Channel' = 1. Unit derives from 'Primary_value_unit'
•
primary_value_unit
– Unit code of 'Primary_value'
– %
•
secondary_value_1
– Process pressure. Selected as input to AIFB by setting 'Channel' = 2. Unit derives from 'Secon-
dary_value_1_unit'
•
secondary_value_1_unit
– Unit code of 'Secondary_value_1'
– bar, PSI, …, m, ft, …; in case of length type engineering unit and access to parameters the
corresponding values will be converted by density factor