Yokogawa EJX440A - Manual (Page 55)

<4. Diagnostics>
4-15
IM 01C25T01-01E
4.2.2.12 ILBD Parameter List
# Parameter name Default value Expanation
1 Diag Error 0x0000 The results detected by ILBD or Heat trace monitoring are stored into this
parameter.
Also the condition abnormality in the diagnostic process is stored as an error.
2 Diag Option 0x08FC The masking in this parameter enable to display each error message and the
status to the output signal or LCD.
The error assigned to each bit is corresponding to that of Diag Error.
Writable only when Diag Mode is "Stop".
3 Diag Out Option Off Output mode of 4-20mA when an advanced diagnostic alarm is generated.
There are following three output modes; Off, Burnout, or Fall back.
4 Diag Fixed Out
Va
21.6 mA Parameter for "Fall back" function in the Diag Out option. The output value of
4-20 mA analog signal is specified when an alarm is generated. The value can be
entered within 3.6 to 21.6 mA.
5 DO Select Off Available when option code /AL is specified. The variables for status output are
specified to this parameter. When the advanced diagnostic function (option code
/DG6) is installed, the parameters monitoring in diagnostic process can be also
assigned to the status output.
6 Diag Mode Stop The operation mode of ILBD is set.
Stop: The blockage detection is stopped.
Calculate: The blockage detection is carried out.
The alarms are generated along with the detected result.
Reference: The reference values are obtained and the update values are
overwritten.
After setting, this mode moves automatically to "Calculation".
7 Diag Period 180 (sec) The data acquisition period for ILBD is set within 20 to 65535 (sec). If the process
fluctuation values are unsteady, this value is changed to the longer to enhance
the accuracy of the blockage detection.
Writable only when Diag Mode is "Stop".
8 Diag Supp Count 3 Detection count to generate an alarm. When the statistical value as Ratio fDP
and BlkF exceeds consecutively the threshold by number of times preset to this
parameter, it is estimated that the impulse line is plugged.
9 Diag Description Memo field. 32 alphanumerics
10 fDP Average value of the sum of squares of differential pressure/pressure fluctuation.
11 fDP Status Status of fDP
12 fSPl Average value of the sum of squares of low-pressure-side static pressure
fluctuation. For gauge/absolute pressure transmitter, 0 is set.
13 fSPl Status Status of fSPl
14 fSPh Average value of the sum of squares of high-pressure-side static pressure
fluctuation. For gauge/absolute pressure transmitter, 0 is set.
15 fSPh Status Status of fSPh
16 BlkF Blockage degree characterized in comparison of high- and low-pressure side
pressure fluctuation value.
17 BlkF Status Status of BlkF
18 DPAvg Ratio of the average of differential pressure/pressure to the maximum span of an
EJX transmitter.
19 DPAvg Status Status of DPAvg
20 Ratio fDP CRatio fDP or NRatio fDP is used by Diag Comp setting.
fDP decreases and this parameter is used to determine whether one or both
sides are plugged.
21 Ratio fDP Status Status of Ratio fDP
22 Ratio fSPl SQRT ( fSPl/Ref fSPl).
fSPl decreases and this parameter is used to determine whether low-pressure-
side is plugged.
23 Ratio fSPl Status Status of Ratio fSPl
24 Ratio fSPh SQRT ( fSPh/Ref fSPh).
fSPh decreases and this parameter is used to determine whether high-pressure-
side is plugged.
25 Ratio fSPh
Status
Status of Ratio fSPh
26 Ref fDP Value of fDP obtained under normal condition.