Wonderware 10.1 Historical Trend Log Interval

bjh said:

As far as I know, Wonderware logs historical data if, and only if, the data in question changes. So there is no need for time-based logging settings.

The HTUpdateToCurrentTime only affects the trend you give it, not the data.

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Phrog30 said:

I'm not used to Wonderware, and I can't seem to see where I can setup how often tag(s) are logged. For testing, I have two analog tags setup to log data. I have historical logging enabled and set to keep files for 30 days, which is what the customer wants. However, they are not sure how often they want each point logged. For starters I was going to use one second. However, I don't see where this is setup at. On the 16-pen trend I can see where to configure the update time, but on a historical trend, which is what I am using (8-pen trend), there is no place to select this.

I have setup HTUpdateToCurrentTime within the trend window script to update once a second. However, this doesn't affect the data logging, does it?

Can you Wonderware gurus please point me in the right direction?

Thanks,
James

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tomjose.oze said:

The 'Log Deadband' sets a threshold that must be exceeded before the tag’s value is written to the log file. You can find this parameter as part of the analogue tag parameter in the 'Tagname Dictionary' in InTouch.

See image attached.

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Phrog30 said:

Thanks for the information, but a little slow on the reply.

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