ken_reiss

PE Expression for last good value of tag

Discussion created by ken_reiss on Dec 7, 2009
Latest reply on Dec 10, 2009 by cescamilla

Hi all,

 

Is it possible to get the last good time/value of a tag using a PE expression?  I want to use this last good value on a ProcessBook display so I was thinking of doing it via a DataSet.  My data comes from a PING interface that is measuring reply times from underground mining trucks, when they are near an Access Point.  When they are out of range of an access point, I obviously get I/O Timeout.  My data looks like this:

 

07-Dec-09 12:37:09 I/O Timeout
07-Dec-09 12:23:00 71
07-Dec-09 11:50:37 I/O Timeout
07-Dec-09 11:30:22 197
 

 

Ken

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