705-5100-F21 Datasheet, PDF (34/52 Pages) Magnetrol International, Inc. – Enhanced Model 705 with PROFIBUS PA™ Digital Output

When the Model 705 is operating correctly, the QUALITY
is shown as “GOOD,” and the SUB_STATUS is “Non-
Specific.”
Depending on the FAIL SAFE MODE in AI BLOCK,
when the Enhanced Model 705 measurement cycle fails to
find a valid output level, the transmitter maintains the last
good value as the output and flags the failure. The LIMIT
attribute is the same as the last good measurement. Excessive
disrupted cycles causes the transmitter to go into a defined
operational mode based on the cause of the disrupted cycles.
When the Enhanced Model 705 detects a level above the
highest measurement point of the probe the operational
mode is shown as “May Be Flooded.” This is due to the fact
that since the actual level location above the top of some
probes is not known, the output may not be accurate.
The Model 705 operational mode is DRY_PROBE when
the level is below the end of the probe. Again, the output
may not be accurate, since the location of the level below
the end of the probe is not known. The TRANSDUCER
BLOCK output is calculated as LEVEL_OFFSET.
When in the dry probe condition, the Model 705 compares
the measured length of the probe to the value entered into
the PROBE_LENGTH parameter. If the measured value
does not match PROBE_LENGTH, a fault is reported. The
QUALITY will be shown as “Bad,” and the SUB_STATUS
is “Configuration error.”
If the Model 705 fails to find a measurable level, either due
to an actual loss of a level signal or the loss of a proper
Fiducial (reference) signal, the TRANSDUCER BLOCK
maintains the last good value as the output and flags the
failure. The QUALITY is “Bad,” the SUB_STATUS is
“Sensor failure” for no level (or “Device failure” for loss of
the Fiducial), and the LIMIT attribute is “Constant.”
Device status conditions and the effects on PV Status are
summarized in section 7.1.2.
6.1 Simulation Feature
The Eclipse Model 705 with PROFIBUS PA^™ supports the
Simulate feature in the Analog Input Block. The Simulate
feature is typically used to exercise the operation of an AI
block by simulating a TRANSDUCER block input.
When an Analog Input Block is in Manual Mode, the oper-
ator can also set the value and status of the OUT parameter
to simulate different AI BLOCK outputs.
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57-645 Eclipse Guided Wave Radar Transmitter - PROFIBUS PA^™