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Reference Manual
00809-0100-4697, Rev GA
Section 3: Configuration
November 2014
Configuration
Table 3-4. Alarm Priority Levels
Status handling
There are no status parameters associated with the resource block.
3.4.2
Field Diagnostics & PlantWeb Alerts
The 848T ITK6 has two mechanisms for alarms, one is Field Diagnostics (FD) and other is
PlantWeb Alerts (PWA) for backward compatibility only.
The flexible capability has been added to allow user to select any alarm to be in the PWA
FAILED/FD FAILED group or PWA MAINTENANCE/FD OFFSPEC group or PWA ADVISE/FD
MAINTENANCE group or PWA ADVISE/FD CHECK group.
In PlantWeb Alerts, the alarms can be represented in three groups i.e. FAILED, MAINT & ADVISE.
In Field Diagnostic, the alarms can be represented in four groups i.e. FAILED, OFFSPEC, MAINT &
CHECK.
Parameter FAILED_PRI is used as a switch for using Field Diagnostic and PlantWeb Alerts.
How to use Field Diagnostic Alarm
If FAILED_PRI is equal to 0, Field Diagnostic alarms are supported and PlantWeb alarms are not.
Field Diagnostic functionality includes four different Field Diagnostic Alarms such as
FD_FAIL_ALM, FD_OFFSPEC_ALM, FD_MAINT_ALM and FD_CHECK_ALM. For these alarms,
there are corresponding alarm priority parameter, masking parameter alarm active and alarm
mapping parameter such as FD_*_PRI, FD_*_MASK & FD_*_ACTIVE & FD_*_MAP.
How to use PlantWeb Alarm
If FAILED_PRI is greater than 0, PlantWeb alarms are supported and Field Diagnostic are not.
PlantWeb functionality includes three different PlantWeb Alarms FAILED_ALM, MAINT_ ALM
and ADVISE_ ALM. For PlantWeb Alerts, there are corresponding alarm masking parameter,
alarm active parameter and alarm mapping parameter such as *_MASK, *_ACTIVE & *_ENABLE.
These parameters have Read only access and are duplicated from corresponding FD parameters.
So for example, in case of PWA alarms, if user wishes to change the mapping of any PlantWeb
Alerts then the new value is written to the corresponding FD_*_MAP parameter. *_ENABLE shall
reflect whatever is being written to FD_*_MAP parameter. The same applies for *_MASK
parameters.
Note
Here * implies all 4 categories of FD alerts for e.g. FD_*_ACTIVE resembles FD_FAIL_ACTIVE,
FD_OFFSPEC_ACTIVE, FD_MAINT_ACTIVE & FD_CHECK ACTIVE.
The similar notation is also applicable for PWA alarms for e.g. FD_*_ACTIVE resembles
FAIL_ACTIVE, MAINT_ACTIVE & ADVISE ACTIVE.
Number
Description
0
The priority of an alarm condition changes to 0 after the condition that caused the
alarm is corrected.
1
An alarm condition with a priority of 1 is recognized by the system, but is not reported
to the operator.
2
An alarm condition with a priority of 2 is reported to the operator, but does not require
operator attention (such as diagnostics and system alerts).
3-7
Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.
8-15
Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.
Содержание Rosemount 848T
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