User manual

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Continuous profiling is set by entering 0 for the Profile Start Interval. This profiling is
asynchronous and provides the most dense MMP sampling possible. During continuous profiling
there is no delay between profiles (each profile begins as soon as the data from the previous
profile is saved).
Reference Date/Time <R>
Reference date/time is a calculation that takes place throughout the deployment to keep
the schedule in sync. The initial reference time is set to the intended start time of Profile 1 (as
illustrated in Figure 7-63). Range is 1970 to 2038 in 1 second increments. An example of how
reference time is used is shown below (profiles are intended to start at 0000, 0600, 1200, 1800,
and so on). Reference time is also used during recovery from a Watchdog reboot.
00.00 0600 1200 1800
A
ctual Profile Time
Reference Time Calculation
Profile 1 Profile 2 Profile 3
The actual time required for Profile 1 is less than the start interval for the deployment, so
the reference time calculation yields 0600 – the expected start time for Profile 2. In Profile 2, the
actual time required exceeds the start interval, therefore the reference time calculation yields 1800
and the profile scheduled at 1200 is skipped. The reference time algorithm synchronizes the
profile start time with the programmed deployment schedule, in the event of an unexpectedly
long profile time. In this example, Profile 3 would begin at 1800hrs.
Appendix 7-47