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

1.5

Time Synchronization Function

The time synchronization function synchronizes the time in a C intelligent function module with the CPU module time (in
multiple CPU system, CPU No. 1).
Time synchronization timing
Timing of time synchronization is as follows.
• When the power is turned OFF and ON
• When the CPU module is reset
*1
• Every 500 ms
• When the C intelligent function module dedicated function (CITL_SyncTime) is executed
*1 The operating status of time synchronization can be set with the C intelligent function module dedicated function
(CITL_SetSyncTimeStatus).
Time Time
synchronization synchronization
500ms 500ms
Time
(1) (2)
(1) The power is turned OFF and ON, or the CPU module is reset.
(2) The C intelligent function module dedicated function (CITL_SetSyncTimeStatus) is executed. (Synchronization is stopped.)
(3) When the C intelligent function module dedicated function (CITL_SyncTime) is executed.
(4) The C intelligent function module dedicated function (CITL_SetSyncTimeStatus) is executed. (Synchronization is started.)
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 be set back to the original time when the daylight saving time ends.
The following shows an example of daylight saving setting time.
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
(Daylight saving time)
Time
synchronization
500ms 500ms
(3)
01:59:59 02:00:00
01:59:59 03:00:00
(Daylight saving time)
Start
00:59:59 01:00:00
01:59:59 01:00:00
End
Time Time
synchronization synchronization
500ms 500ms
(4)
02:00:01
03:00:01
(Daylight saving time)
01:00:01
01:00:01
1.5 Time Synchronization Function
500ms
1 FUNCTION
35
1