Flowserve 3400IQ Digital Positioner - Manual (Page 80)

Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
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Logix 3400IQ Digital Positioner Alert Objects
Three alert objects are defined in the Logix 3400IQ digital positioner for event and alarm reporting.
1 for events
1 for discrete alarms
1 for analog alarms
8.12 Alarm and Event Reporting
Fieldbus Alarms, Events and Alert Objects
Alarms are generated when a block leaves or returns from a particular state.
Events are instantaneous occurrences such as the change of a parameter.
Alarms and event messages are communicated to operator interfaces and other devices using alert
objects.
Fieldbus Alarm Messages
Alarm messages are usually transparent to the user. A host system typically receives these messages
and presents them to the user.
Acknowledgment of alarms by the operator may be necessary to satisfy operation requirements.
Event Messages
Event messages contain a time stamp
Events also must be confirmed; otherwise the block will continually report the event.
Acknowledgment of events may be necessary to satisfy operation requirements
Internal Positioner Alarms
NOTE: These are standard fieldbus alarms.
The Logix 3400IQ digital positioner has several internal alarms which monitor electronics operation.
An internal alarm causes the red LED code to blink. Positioner alarms differ from alerts because
the action of the positioner may be erratic during the alarm conditions. Alert warns operations that
a predefined, user-configured condition has occurred that may require service in the near future.
Alarms cause the red LED code to blink, while alerts cause the green LED code to blink.
Refer to the following parameters to view positioner alarms:
STATUS_FLAGS
CALIBRATE_FLAGS
TRAVEL_FLAGS
INTERNAL_FLAGS
PRESS_FLAGS
12 bit A/D Reference Alarm The Logix 3400IQ digital positioner utilizes a 12-bit Analog- to-Digital
(A/D) converter to acquire stem position readings. If the precision reference used by the A/D drifts
outside rated tolerances, the 12 bit A/D Reference Alarm will become active. A reference error will
cause change in calibration and control readings. If a continuous 12 bit A/D reference alarm exists,
the main PCB assembly must be replaced. Refer to the Logix Series 3400IQ Digital Positioner IOM for
spare parts kit numbers.
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