Yokogawa EJX930A - Manual (Page 152)

<Appendix 8. Advanced Diagnostics>
A8-8
IM 01C25T02-01E
A8.2.5 Alarm and Alert Setting
The abnormal results, as the blockage detection
and high/low flange temperature (heat trace
monitoring) are given by an analog alert or the LCD
display of alarm status. The analog alert or the LCD
display of alarm status is set according to the flow
shown in below figure.
FA0806.ai
Discrete Alarm
FF Alert Notify and
(STB.FLG_TEMP_ALM)
Outside Diagnosis Range/
Invalid Ref xx
Masking
PV/SV/TV Status
Reflection Flag
(STB.DIAG_OPTION)
PV/SV/TV Status
Alarm Display
on LCD
Discrete Alarm
FF Alert Notification
(STB.DIAG_H_ALM)
(STB.DIAG_L_ALM)
Storage of Abnormal results
(STB.DIAG_ERR)
Alarm Masking
(STB.DIAG_OPTION)
Device Status
(RB.DEVICE_STATUS_7)
Alarm Enabling
(STB.ALAM_SUM.DISABLED)
Report Setting
(STB.DIAG_PRI)
Figure A8.5 Alarm and Alert Setting
A8.2.5.1 Alert Setting
 Link to DIAG_H_ALM and DIAG_L_ALM
DIAG_H_ALM and DIAG_L_ALM enable to indicate
the alarm status separately divided into the high-
and low-pressure-side alert. The factory setting is
not enabled to display them.
Enable to display the alarm status to DIAG_H_ALM
and DIAG_L_ALM according to the following
procedure.
1) Set "Stop" to DIAG_MODE.
2) Uncheck the checkbox of "Diag Alm Disabled”,
which is corresponding to bit 8, in ALARM_
SUM.
Note: Set to “Calculation” after setting the parameters.
 Report Setting
DIAG_PRI in SENSOR Transducer block defines
the priority to transfer the analog alert to the host.
The alert is generated according to the priority when
interfering in other alerts.
DIAG_PRI
Bit Description
0 An alert is not generated.
1 An alert does not be reported to the host.
2 Disabled
3-7 ADVISORY
8-15 CRITICAL
The default value at the factory setting is set to 1.
Set the priority according to the following procedure.
1) Set "Stop" to DIAG_MODE.
2) Enter the value to DIAG_PRI in the number of 3
to 15.
Note: The setting of the highest priority is 15.
Set to “Calculation” after setting the parameters.
A8.2.5.2 Alarm Display on LCD
If the ILBD algorithm detects the abnormality, the
content of the detected result is displayed with
“AL.88” or “AL.89” on the LCD. “AL.88” indicates
that condition is not applicable for the abnormality
detection and “AL.89” indicates the abnormality is
detected.
FA0808.ai
Figure A8.6 Display Example of High Side Blocking
The alarm display on LCD regarding ILBD is
described in Table 8.12 of the section 8.
A8.2.5.3 Alarm Status
When the algorithm of ILBD and Heat trace
monitoring detect the abnormality, the result is
stored in DIAG_ERR. The alarm status based on
the detected abnormality is displayed to DIAG_ERR
in the SENSOR Transducer block.
DIAG_ERR
Bit Alarm status
D
IA
G
_H
_
A
LM
D
IA
G
_L
_
A
LM
FL
G
_
TE
M
P_
A
LM
0 Not used.
1 Not used.
2 A Blocking
 
3 Large Fluctuation of Low Side 
4 Large Fluctuation of High Side 