Changing sampling time for logging data in DSC

currently I created lots of shared variables by Modbus server. I'm wondering when I active logging data to Citadel, there is any option for change sampling time for logging data or not. I only saw option for changing base on percentage of value differences.
Since I want to export them to MS Excel later, I want decrease the number of sample datas by decreasing sampling time.
Thanks in advance.

This is my idea that i try
First, I add Enqueue Message for Enable time case
Then, I create Enable time cases and write box diagram fallow below pic.
But when i run program,it don't work, time don't count
Please help me.

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DSC 8.6.1 wrong timestamps for logged data with Intel dual core

Problem Description :
Our LV/DCS 8.6.1 application uses shared variables to log data to Citadel. It is running on many similar computers at many companies just fine, but on one particular Intel Dual Core computer, the data in the Citadel db has strange shifting timestamps. Changing bios to startup using single cpu fixes the problem. Could possibly set only certain NI process(es) to single-cpu instead (but which?). The old DSCEngine.exe in LV/DSC 7 had to be run single-cpu... hadn't these kind of issues been fixed by LV 8.6.1 yet?? What about LV 2009, anybody know?? Or is it a problem in the OS or hardware, below the NI line??
This seems similar to an old issue with time synch server problems for AMD processors (Knowledge Base Document ID 4BFBEIQA):
http://digital.ni.com/public.nsf/allkb/1EFFBED34FFE66C2862573D30073C329
Computer info:
- Dell desktop
- Win XP Pro sp3
- 2 G RAM
- 1.58 GHz Core 2 Duo
- LV/DSC 8.6.1 (Pro dev)
- DAQmx, standard instrument control device drivers, serial i/o
(Nothing else installed; OS and LV/DSC were re-installed to try to fix the problem, no luck)
Details:
A test logged data at 1 Hz, with these results: for 10-30 seconds or so, the timestamps were correct. Then, the timestamps were compressed/shifted, with multiple points each second. At perfectly regular 1-minute intervals, the timestamps would be correct again. This pattern repeats, and when the data is graphed, it looks like regular 1-sec interval points, then more dense points, then no points until the next minute (not ON the minute, e.g.12:35:00, but after a minute, e.g.12:35:24, 12:36:24, 12:37:24...). Occasionally (but rarely), restarting the PC would produce accurate timestamps for several minutes running, but then the pattern would reappear in the middle of logging, no changes made.
Test info:
- shared variable configured with logging enabled
- data changing by much more than the deadband
- new value written by Datasocket Write at a steady 1 Hz
- historic data retrieved by Read Traces
- Distributed System Manager shows correct and changing values continuously as they are written

Meg K. B. ,
It sounds like you are experiencing Time Stamp Counter (TSC) Drift as mentioned in the KB's for the AMD Multi-Core processors. However, according to this wikipedia article on TSC's, the Intel Core 2 Duo's "time-stamp counter increments at a constant rate.......Constant TSC behavior ensures that the duration of each clock tick is
uniform and supports the use of the TSC as a wall clock timer even if
the processor core changes frequency." This seems to suggest that it would be not be the case that you are seeing the issue mentioned in the KBs.
Can you provide the exact modle of the Core 2 Duo processor that you are using?
Ben Sisney
FlexRIO V&V Engineer
National Instruments

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Diagnosis
No IDocs could be sent to BI using RFC.
System Response
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Error handling:
If the TRFC is incorrect, check whether the source system is fully connected to BI. In particular, check the authorizations of the background user in the source system.
I am loading data through Process chain and user is BWREMOTE (authorized user).
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Dear Karthik
No I couldn't resolve till now
But Everything is fine.
Now status is yellow only (209 from 209). Now what i want to do.
Im getting below message in status tab
Missing data packages for PSA Table
Diagnosis
Data packets are missing from PSA Table . BI processing does not return any errors. The data transport from the source system to BI was probably incorrect.
Procedure
Check the tRFC overview in the source system.
You access this log using the wizard or following the menu path "Environment -> Transact. RFC -> Source System".
Error handling:
If the tRFC is incorrect, resolve the errors listed there.
Check that the source system is connected properly to BI. In particular, check the remote user authorizations in BI.
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Changing sampling time for logging data in DSC

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