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Appendix C
Fieldbus Parameters
C-12
©
National Instruments Corporation
LIM_NOTIFY
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
the device can have active at once. This must be less than or equal to
MAX_NOTIFY
.
LO_ALM
The current state of the low alarm, along with a time and date stamp.
LO_LIM
The limit, in PV units, beyond which the low limit alarm is considered
active.
active.
LO_LO_ALM
The current state of the low-low alarm, along with a time and date stamp.
LO_LO_LIM
The limit, in PV units, beyond which the low-low limit alarm is considered
active.
active.
LO_LO_PRI
The priority of the low-low limit alarm.
Table C-8. Linearization Types
Type
Description
Direct
The block output is directly taken from the transducer value:
Indirect
The block output is scaled according to
OUT_SCALE
from the value in
FIELD_VAL:
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.
Uninitialized
An invalid setting. The device reports a configuration error with an
Uninitalized
L_TYPE
.
OUT
transducer_value
=
OUT
FIELD_VAL(OUT_SCALE.EU100-OUT_SCALE.EU0)
(
)
=
OUT
OUT_SCALE.EU0
FIELD_VAL
100
--------------------------------
+
OUT_SCALE.EU100
OUT_SCALE.EU0
–
(
)
⋅
=