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March 2016
Reference Manual
00809-0100-4772, Rev FA
167
D.2
PlantWeb alerts overview
Alerts are generated, mapped, and masked as NE 107 Status Signals. If PlantWeb alerts are
required the NE 107 Status Signals are automatically converted to PlantWeb Alerts for
annunciation and display. PlantWeb alerts have three alert parameters. They are in order
from highest to lowest priority:
1.
FAILED_ALM
2. MAINT_ALM
3. ADVISE_ALM
The eight alert conditions are factory configured to annunciate as one of the three specific
alert parameters.
PlantWeb alert parameter conditions and factory defaults
Devices are shipped from the factory with all applicable alerts enabled. The alert conditions
reported in each parameter are:
1.
FAILED_ALM
a.
Electronics failure
b. Open Thermocouple (MTA only)
A FAILED_ALM indicates a failure within a device that will make the device or some part of
the device non-operational. This implies that the process variable may no longer be
available and the device is in need of immediate repair.
2. MAINT_ALM
a.
Flow is simulated by an external signal source.
b. Flow is simulated using the internal signal generator.
c.
Flow is below the Low Flow Cutoff setting.
d. Flow is above the PV range limit.
e.
Flow is above the Sensor range limit.
f.
The measured process temperature is above the sensor limit (MTA only).
g. The measured process temperature is below the sensor limit (MTA only).
h. The measured process temperature is above the limit for density calculations (MTA
only).
i.
The measured process temperature is below the limit for density calculations (MTA
only).
A MAINT_ALM indicates that the device is experiencing pressure or temperature conditions
that are outside the device operating range. This implies that the process variable may no
longer be accurate. It also implies that if the condition is ignored the device will eventually
fail. The device should be checked to determine the type of abnormal condition and
recommended actions to resolve it.
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Industry Automation
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