on 10-27-2011 7:53 PM
Hi,
I'm trying to retrieve a certain tag in PI.
When I'm watching the tag at PI ProcessBook, I see the values as follow:
Time Value
24/10/2011 13:50:02 92,19048
24/10/2011 14:18:02 91,92674
24/10/2011 14:18:13 91,72161
24/10/2011 14:18:21 I/O Timeout
24/10/2011 14:28:08 92,337
24/10/2011 15:09:08 92,48351
But in xMII, when I'm retrieving the tag through TagQuery in HistoryEvent mode, the result is:
Time Value
24/10/2011 13:50:02 92,19048
24/10/2011 14:18:02 91,92674
24/10/2011 14:18:13 91,72161
24/10/2011 14:18:21 246
24/10/2011 14:28:08 92,337
24/10/2011 15:09:08 92,48351
How could I distinguish "246" as a true value or "246" as "I/O Timeout" error code?
I've imagined that it could be something in PCO settings. So, I've set up the Field: "Dig Str as String" as true in our PI Connection, according to this documentation: http://help.sap.com/saphelp_pco21/helpdata/en/b6/062c4fb8934e118ac6209f18c7dcf1/content.htm .
I was hoping that it could interpret the error code. Indeed, it does some interpretation. A certain query previously returned :
Time Value
24/10/2011 13:50:02 0
24/10/2011 14:18:02 1
24/10/2011 14:18:13 0
Now, it returns:
Time Value
24/10/2011 13:50:02 OFF
24/10/2011 14:18:02 ON
24/10/2011 14:18:13 OFF
But, when there are any "I/O Timeout error", the query doesn't execute and displays this error message:
Unexpected value type for Item XPTO_TAGNAME; expected System.Single, received System.String[Value = I/O Timeout]
Any suggestions?
Thanks,
Alexandre Sardinha
Assuming you're running an up to date PCo release, then at face value I would suspect that data quality is not filtering properly. I would expect NA for the I/O error, since the number is bogus.
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Hi Alexandre,
View the link below
http://help.sap.com/saphelp_pco21/helpdata/en/b6/062c4fb8934e118ac6209f18c7dcf1/content.htm
Configuration in PCO
Dig Str as String / If you set this indicator, the Dig Str values are interpreted as a string.
Hope this help.
Danilo Santos
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