When logging data from your machine you may see gaps in your logged data where you would expect there to be data logged, but isn't. This can be occasionally or periodically.

This can have various potential causes.

One of those causes is that the PLC may not be fast enough to process the data requests from the IXON edge gateway. The load on Its CPU may be too high.

Another potential cause is that the data source setting Polling sleep time is set too high, higher than your logging interval, meaning that the IXON edge gateway does not get data fast enough to log at the desired interval. This may look like gaps or missing data.

Change the polling sleep time in your data source settings and make sure it's shorter than your shortest logging interval.

1. Go to Fleet Manager > Devices and click on your device name.
2. In the left menu, go to Data sources.
3. Click on your data source.
4. Adjust the Polling sleep time accordingly.
   • Try a larger value. This may reduce the potential CPU load on your PLC.
   • Make sure that it is smaller than your shortest logging interval. For example, if your shortest logging interval is at 1 second, your polling sleep time should not exceed 500 ms.
   • Note that a higher value may also have a negative effect on the accuracy of tags that are configured "log on change". Effectively, it's possible that changes are detected later or not at all, because any changes during the polling sleep time are not detected. Changes that persist until after the polling sleep time has expired are detected.

You have now made the changes in the IXON Cloud, but these are not yet active in your device. You will need to push your changes to your device for them to take effect.

5. Click on Push device config in the top right corner.
6. Observe whether the newly logged data shows improvements.

If the issue is not resolved by this configuration change, please contact us to help with analysis of the problem.