Hi! nice to meet you!

I'm a question about save cycle of S7-1200 datalog.
I used datalog to OB1 or OB30. but Save cycle was irregular

Save condition of datalog is 100ms. It should be save the ten block on one sec.

ex) 18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3
18:34:41 data1 data2 data3 ... Success

18:34:42 data1 data2 data3
18:34:42 data1 data2 data3
18:34:42 data1 data2 data3 ... Fail

18:34:43 data1 data2 data3
18:34:43 data1 data2 data3
18:34:43 data1 data2 data3
18:34:43 data1 data2 data3
18:34:43 data1 data2 data3 ... Fail

18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3
18:34:44 data1 data2 data3 ... Success

Now, I'm using cycle interrupt. It cyclic time is 100ms and Phase offset is 0ms.

I want to know detail about save cycle time of datalog.
I want to know detail about datalog.

I can't speak english well.
Thank you!