Change The Clock - ABB RMC-100 User Manual

Figure 8-37: Restart using factory configuration
8.6

Change the clock

When applications are instantiated on the RMC, a change to the clock for daylight savings time, or
time drift of the instantiated applications, can affect the time on log period entries. A clock change
must preserve the integrity of accounting audit trails. Follow the guidelines for clock changes
according to Table 8-4.
Table 8-4: Types of clock changes
Type of clock Description
change
Clock change not The clock does not change for the next log period entry.
crossing an hour Example: If present time is 4:15 p.m. and the clock changes to 4:05 p.m. of the
boundary same day, the entry reflects accumulated averages over a 70-minute time-
period (15 minutes plus 55 minutes).
Forward clock This forces a log period entry for the portion of the hour that accumulated since
change crossing last hourly entry. The RMC then advances to the newly-defined data flow record
an hour boundary and maintains the day's data in the newly defined boundary.
boundary Example: If present time is 4:55 p.m. and clock changes to 5:05 p.m. of the
same day, the entry reflects only a 55-minute average accumulation. Then a
new flow record is written based on a 55-minute accumulation.
Backward clock The hourly entry includes the part of the hour that accumulated since the last
change crossing hourly entry. This is the same as it would be for a forward clock change that
an hour crosses an hourly boundary. The RMC advances to a new day's data flow record
boundary and maintains the balance of the day's data in the new record.
Example: If present time is 5:05 p.m. and clock is changed to 4:55 p.m. of the
same day, the log period record entry reflects only a 5-minute average
accumulation. Then a new flow record has a 60-minute accumulation.
Make time changes in the Date/Time field on the PCCU Station Setup tab.
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