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5/20/2005 10:15am). Throughout this document the first scenario is called run-time and the
second is called real-time. These two scenarios cannot be used interchangeably; if the user
wants real time stamps, they must always set the clock after power-up; otherwise they must
never set the clock.
The following will show users how to log out Fault, Warning, Alarm, Calibration, and
Maintenance events.
5.12.1 Fault Event
Whenever a fault occurs, the fault and the time of the fault will be recorded. If the same
fault occurs, it is logged for every 30 seconds.
The quantity of faults will be saved in a counter and the counter increments when there
is a new fault, the count is saved after the event. When the fault is removed, it is not
saved and the counter is not incremented. The maximum count is 65535 and then the
counter will rollover to zero and begin counting again.
There are a total of 10 event time stamps stored. If there is a new fault after that, the
oldest event time stamp is no longer to be logged.
5.12.1.1 Event Index (0x0057)
Before the user wants to read a logged time of a fault, warning, alarm, calibration, or
maintenance event, the user has to write a number to this event index register.
An event index range should be determined before to read all event logged times. The user
should read Fault Event Count (0x006F), or other (Warning, Alarm, Calibration, Maintenance)
Event Count registers, in order to determine the range of the index event. The range is valid if it
equals fault event count minus 1 provided that fault counter is less or equal 10. If the counter is
greater than 10, the range is 0 to 9, and because the maximum events logged are 10, the
maximum range is also 0 to 9.
An index event number is reverse to the number of the event. For example, if there are 5 fault
logged events, writing 0 will affect the event logged time #5, or 4 the event logged time #1.
A read will return the value that is just written.
NOTE:
This Event Index register is used for all Fault, Warning, Alarm, Calibration and
Maintenance Logged Events.
5.12.1.2 Fault Seconds Time Hi (0x0068)
A read will return the upper seconds stored in Hi word for a Fault event log entry. The
maximum value is 65535 or 0xFFFF in hex.
5.12.1.3 Fault Seconds Time Hi (0x0069)
A read will return the lower seconds stored in Lo word for a Fault event log entry. The
maximum value is 65535 or 0xFFFF in hex.