705-5100-F21 datasheet(34/52 Pages) MAGNETROL

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57-645 Eclipse Guided Wave Radar Transmitter - PROFIBUS PA™

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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