Time Synchronization Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.6

Time Synchronization Function

The time synchronization function synchronizes the time of a high speed data logger module with that of a CPU module (CPU
No.1 in a multiple CPU system).
Time information is used for the logging data time stamp, time of event occurrence/restoration, and report creation time, and
date and time information of the "Diagnostics" screen.
Time synchronization timings
Time synchronization timings are as follows:
■Timing specified in Configuration Tool
Time is synchronized at the timing specified in the time synchronization setting in Configuration Tool.
The synchronization timing can be specified in fixed cycles (interval in minutes) or in fixed time (time and day of the week).
■Module startup
Time is synchronized at the timing when a high speed data logger module is started or restarted after performing any of the
following operations.
• Powering OFF and ON
• Resetting a CPU module
• Upgrading a setting
■Time synchronization request
Time is synchronized at the timing when the 'time synchronization request' (YB) is turned OFF to ON.
Daylight saving time
If daylight saving time is set in the CPU module, the clock will be set ahead by 1 hour when the daylight saving time starts, and
it will set back to the original time when the daylight saving time ends.
Ex.
If the daylight saving time starts from 02:00
The clock will be set ahead by 1 hour at the start time.
Disabled
Enabled
Ex.
If the daylight saving time ends at 02:00
The clock will be set back to the original time at the end time.
Disabled
Enabled
When specifying the time of one hour before and one hour after both the start and end time of daylight saving time with the
data logging setting, event logging setting, or report setting, there may be situations where the correct time cannot be judged.
When a "Time interval specification" is specified, the data cannot be sampled because the correct time cannot be judged for
that one last hour of the daylight saving time, when the time is adjusted back.
1 FUNCTION
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1.6 Time Synchronization Function
01:59:59
01:59:59
(Daylight saving time)
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(Daylight saving time)
02:00:00 02:00:01
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(Daylight saving time)
Start
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