FOUNDATION Fieldbus-compliant ALTImass series
L-740FF-1-E
1
5.3 AI Function Block
AI function block calculates instantaneous flow rate output.
5.3.1 AI Function Block Configuration
（1）Parameter setting
1. CHANNEL
AI function block calculates based on measured values from transducer block. Select one from
VOLUME FLOW, MASS FLOW, DENSITY, or TEMPERATURE for CHANNEL (input selection)
parameter of AI function block.
2. L_TYPE
To output CHANNEL values without scaling, set "Direct" for L_TYPE parameter. To scale by converting
values to different range or unit, set "Indirect" instead.
3. XD_SCALE
If "Indirect" is set for L_TYPE parameter, configure sub-parameters of XD_SCALE such as EU_100,
EU_0, UNITS_INDEX(
※
), and DECIMAL according to scale of CHANNEL.
※
: For UNITS_INDEX, set the unit of measurement value configured for CHANNEL. (For example, if
MASS FLOW is set for CHANNEL, set the unit that is configured for MASS_FLOW_UNITS of
transducer block for XD_SCALE.)
4. OUT_SCALE
To convert values to different range or unit by setting "Indirect" for L_TYPE parameter, configure sub-
parameters of OUT_SCALE such as EU_100, EU_0, UNITS_INDEX, and DECIMAL.
5. Other parameters
As necessary, set parameters associated with output of AI function block such as LOW_CUT,
PV_FTIME, etc.
TB1 (Volume flow)
TB2 (Mass flow)
TB3 (Density)
TB4 (Temperature)
PRIMARY̲VALUE
PRIMARY̲VALUE
PRIMARY̲VALUE
PRIMARY̲VALUE
ch1
ch2
ch3
ch4
Channel
Simulation
Simulated
value
Scale conversion
CHANNEL
SIMULATE
Disabled
Active
Measured
value
XD̲SCALE
Direct
L̲TYPE
Indirect
Indirect Square Root
√Conversion
OUT̲SCALE
FIELD̲VAL
Cutoff
Filter
Output
IO̲OPTS
Low cutoff disabled
Low cutoff
LOW̲CUT
PV̲FTIME
PV
MODE̲BLK
OUT
AUTO
MAN. O/S
STATUS̲OPTS, Alarm
Manual input value
or Previous value
Output status
processing
Alarm
LO̲LIM, LO̲PRI
LO̲LO̲LIM, LO̲LO̲PRI
HI̲LIM̲HI̲HI̲PRI
HI̲HI̲LIM̲HI̲HI̲PRI
LO̲ALM̲LO̲LO̲ALM
BLOCK̲ALM
UPDATE̲EVT
ALARM̲SUM
ACK̲OPTION
①
①
Fig.4.2 Block diagram of AI function block
