System.tag.configure creating a tag with Uncertain_InitialValue

Ignition
1

Hello all,

I have the following script that I run in the script console:

tagdict = {
'historyEnabled': True, 
'formatString': u'#,##0.00', 
'historicalDeadband': 0.05, 
'scaleMode': u'Linear', 
'historyProvider': u'Hist', 
'rawHigh': 4095.0, 
'opcItemPath': u'ns=2;s=PLC00.PLC00.P00_TnkLvl@Float', 
'historyMaxAgeUnits': 'HRS', 
'opcServer': u'ServerMain', 
'engUnit': u'Ft', 
'documentation': u'History Floating Point Tag', 
'dataType': u'Float4', 
'alarms': [{'setpointA': 7.0, 'notes': u'Floating Point High Alarm', 'priority': u'High', 'mode': u'AboveValue', 'name': u'High', 'inclusiveA': False}, {'setpointA': 2.0, 'notes': u'Floating Point Low Alarm', 'mode': u'BelowValue', 'name': u'Low', 'inclusiveA': False}], 
'historicalDeadbandStyle': u'Discrete', 
'sampleMode': u'TagGroup', 
'name': u'HistoryFloat', 
'engHigh': 10.0, 
'valueSource': 'OPC'
}
system.tag.configure("[Default]_TestImport",tagdict,'m')

When the tag gets created, it has Uncertain_InitialValue. The only thing I can figure out is that when I create the tag with history disabled the value will come back in. This gateway is running 8.0.16. Has anyone else run into this behavior?

Thanks,
Brandon

2

Your opcItemPath doesn’t look valid for Ignition’s OPC server (should have a device name in square brackets). What kind of server is “ServerMain” ?

3

Oh ServerMain is the name of our connection to a TopServer. I can confirm that this path works fine if I use it when creating a tag via the GUI in the designer.

EDIT: Top Server is a third party OPC server.

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4

I would run a system.tag.getConfiguration on it right after creating it, and then after correcting it, and compare the dictionaries.
Something isn’t setting correctly on the creation.

5

For posterity. I found the issue:

‘historyMaxAgeUnits’: ‘HRS’

Should be -

‘historyMaxAgeUnits’: ‘HOURS’

Thanks for the help everyone!

1 Like