Hello,

Our problem is that the data logger creates a log entry each time the data server polls the variables, even though the value hasn't changed. But we'd like it to create an entry only in case the value of the input variables has changed (='On Change'), not if it's only updated.

We are wondering whether that is the way it should be, or if that is a bug, or if we did something wrong in the config of the data logger.

Best regards,

 Hi Daniel,

set the Pollrate = 0, Min.Delta Time = 2minutes (not critical), Min.Delta Value = 'On Change'. in the DataLogger and set a pollrate=1800 of the input data point  ( in Driver Mode). 

Hi Chelo,

maybe I'm missunderstanding something, but as far as I understand your post, it's the same configuration I wrote in my first post. It doesn't work, but it creates an entry into the dataLogger every 30 minutes...

Could you please tell me what's the difference between your solution and mine? Thanks!

Daniel

Hi Daniel,

in the data logger configuration page you have to set the poll rate of the data point to 0!!!!!!!!!!!!!!!!!! NO polling.

Instead you should click on the input data point in the tree (in Driver Mode) and set the poll rate there. In the data point configuration page you see the DP selector, the direction, Static/Dynamic and the (Driver) poll rate...

Hi chelo,

thanks for your time. What you are telling me is exactly what I was doing all the time. And maybe my english is to bad, but it's also what I tried to write in my original post:

1.) set the poll rate on the dataLogger configuration page to 0

2.) set the (Driver) poll rate to 1800

It doesn't work...

Unfortunately I'm unable to use the 'Insert / Image' feature of this forum otherwise I would like to publish my screenshots here.

Daniel

Daniel, it looks like you are doing everything correctly.  I just tried this with the Log on Updates option and On Change selected and the poll rate set in the driver page to 10 seconds, and guess what?  The Data Logger is logging the data point every 10 seconds. I don't believe this is as designed. But I will check today and get back to you.

Here is some information just for clarification purposes:

1.  In the Polling dialog in the Data Logger: Configuration Web page, you should indeed select the Log on Updates option and set the Min. Delta Value  property to On Change.  This means the Data Logger will only log the data point update when the value changes.  Note that when you set the poll rate in this dialog, you are specifying how frequently the Data Logger application polls the SmartServer's internal data server for data point updates.  

2. When you set the poll rate in the Setup - LON Driver Data Point Web page, you are specifying how frequently the SmartServer's internal data server polls the data point over the physical LON channel. Setting the poll rate to 1,800 seconds means that the the SmartServer's internal data server will poll the data points every 30 minutes, and updated data point values should be provided to the SmartServer's built-in applications (e.g., Data Logger, Scheduler, and so on) no sooner than every 30 minutes. 

Hello Jonathan,

thanks for helping me... and thanks for clarification.

Just one interesting observation: In the 'DataLogger: Data Points' Configuration Web page ('General'), I can see that all my data points are configured correctly, as to my understanding. The 'Min Delta Value' is set to 'On Change'.

If I click on one of these data points a form is displayed which allows to set all the parameters. Strange: in the 'Min Delta Value' combobox, the value is set to '0'. That may be only an error while filling the form, or maybe its more than just that...

I'm longing for the next service release...

Best regards,

Daniel

Daniel.

The good news is that I can no longer reproduce this in the latest builds of the next service release. The issue with the settings in the Logging dialog not being saved should also be fixed.

Thank you. I can confirm that with the new Service Release 4.02.054, the problem is solved.

Daniel