Mitsubishi Electric MELSEC iQ-R Series User Manual page 93

Operation for time synchronization
When implementing synchronization with CPU module time, high speed data logger module's time is changed.
As a result, high speed data logger module's time may be greatly changed.
Since there is inaccuracy in the clock element in CPU module and high speed data logger module, the time may be moved
slightly forward or backward when the time is synchronized.
However, data is sampled at a fixed cycle.
2015/1/15 15:48:32.8
2015/1/15 15:48:32.9
Time is synchronized
2015/1/15 15:48:31.5
2015/1/15 15:48:31.6
2015/1/15 15:48:31.7
■When the time of high speed data logger module is set forward by time synchronization
• Cycle determination: Sampling and condition satisfaction time may be shorter than the specified cycle.
• Time determination: Conditions may be satisfied immediately after the time updates.
■When the time of high speed data logger module is set back by time synchronization
• Cycle determination: Sampling and condition satisfaction time may be longer than the specified cycle.
• Time determination: Conditions have been satisfied may be satisfied again.
Considerations for time synchronization function
• Before using the high speed data logger module, set the time data of CPU No. 1.
For the time data settings, refer to the user's manual of the CPU module used.
• There is a deviation in the time data of CPU No. 1 used by the high speed data logger module.
For the time data accuracy, refer to the user's manual of the CPU module used.
• When the high speed data logger module acquires the time data from CPU No. 1, a maximum of one second of delay
occurs as the transfer time.
Therefore, a one-second deviation may occur in logging data time when setting the time.
• The time zone cannot be specified in the time synchronization function of the high speed data logger module because the
clock data follows the time zone set in the CPU module. When the time zone needs to be specified, set it in the CPU
module.
1028 1 100 15.9
1029 1 101 16.0
1030 1 102 16.1
1031 0 103 16.2
1032 0 104 16.3
Data are normally sampled in 100
milliseconds interval
1 FUNCTION
1.6 Time Synchronization Function
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