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BE57-646 ECLIPSE Guided Wave Radar Transmitter - FOUNDATION fieldbus
™
LO_LO_ALM: The status for low-low alarm and its associ-
ated time stamp.
BLOCK_ERR_DESC: Reports more specific details regard-
ing some errors reported through BLOCK_ERR.
The MODE_BLK parameter (within both the TB and AI
Blocks) must be set to AUTO to pass the PV Value through
the AI to the network.
Transducer scaling, called XD_SCALE is applied to the PV
from the CHANNEL to produce the FIELD_VAL in per-
cent.
• Valid XD_SCALE engineering units depend on the
Channel Type.
The AI blocks can display a BLOCK_ERR diagnostic
when:
1. The Channel is not set correctly. (Refer to Default Channel
Table in Section 2.4).
2. XD_SCALE does not have suitable engineering units
3. The SIMULATE parameter is active.
4. AI block MODE is O/S (out of service).
NOTE: This can be caused by the Resource Block being OOS or the AI
Block not scheduled for execution.
5. L-TYPE not set or set to Direct with improper
OUT_SCALE.
The AI block uses the STATUS_OPTS setting and the
TRANSDUCER PV LIMIT value to modify the AI PV
and OUT QUALITY.
A Damping Filter is a feature of the AI block. The
PV_FTIME parameter is a time constant of a single expo-
nential filter for the PV, in seconds. This parameter can be
used to dampen out fluctuation in level due to excessive tur-
bulence.
The AI block also has multiple ALARM functions that
monitor the OUT parameter for out of bound conditions.
The ECLIPSE Model 706FF transmitter incorporates a use-
ful feature that allows the Analog Input (AI) block Out val-
ues to be displayed on the local LCD.
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