National Instruments NI-FBUS - Manual (Page 87)

Chapter 4 Parameters
NI-FBUS Configurator User Manual 4-22 ni.com
L_TYPE (Scaling)
The linearization type. This parameter affects the way the value from the
transducer is linearized in the analog input block before it is presented as
the block output. In all cases, the
FIELD_VAL parameter behaves as
follows:
FIELD_VAL = 100 * (transducer_value – XD_SCALE.EU0) /
(XD_SCALE.EU100 – XD_SCALE.EU0)
FIELD_VAL can be simply described as the percentage of span reading
from the transducer, and therefore its units are percent.
LIM_NOTIFY (Alarming)
A limit on the number of unconfirmed alarm/event notification messages
the device can have active at once. This must be less than or equal
to
MAX_NOTIFY .
LO_ALM (Alarming)
The current state of the low alarm, along with a time and date stamp.
Table 4-15. Linearization Types
Type Description
Direct The block output is directly taken from the transducer value:
OUT = transducer_value
Indirect The block output is scaled according to OUT_SCALE from the value
in FIELD_VAL :
OUT = OUT_SCALE.EU0 + ((FIELD_VAL/100) *
(OUT_SCALE.EU100 – OUT_SCALE.EU0))
Indirect Square Root The block output is scaled according to OUT_SCALE from the value
in FIELD_VAL . Before the field value is rescaled, the square root is
taken.
OUT = OUT_SCALE.EU0 + (SQRT(FIELD_VAL / 100) *
(OUT_SCALE.EU100 – OUT_SCALE.EU0))
Uninitialized An invalid setting. The device reports a configuration error with an
Uninitalized
L_TYPE .