I use an R code to download datas from Aspentech IP21 database. Is there a way to know if a tag is in "bad" status or in "good" status. It would be useful, otherwise I get 0 (zeros) when a variable is bad, but I don't know if it really is zero. Thanks.
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It depends greatly of what you mean by tag, and where do your data comes from.
For most of the values, quality (good on else) is not defined on tag level, but rather on each value:
IP_AnalogDefdefinition, check for fieldIP_TREND_QSTATUS, orQSTATUS(IP_TREND_VALUE)HISTORYandAGGREGATE, it's fieldSTATUSBUT if your tag comes from a CIMIO for OPC interface, you can query the status of the related Get Transfer record:
select "IO_VALUE_RECORD&&FLD"->NAME tagname, IO_DATA_STATUS, IO_DATA_STATUS_DESC from "TransferDefName" where tagname = 'NameOfYouTag'Where TransferDefName can be
IoGetDef,IoLongTagGetDef, orIoLLTagGetDefI hope it helps.