Applies To:
  • CitectSCADA 5.21, 5.30, 5.31
Summary:
Whilst it is not recommended that you do so, it is possible to create trend tags with names that start with a number. Such tags can be compiled by setting the parameter

[GENERAL]
TagStartDigit

to 1 as described in Q1862. Two problems may arise at runtime if this functionality is used.

1. When you query such a tag using either the OLE-DB provider with a select on the TrendHistory table or CTAPI with ctFindFirst, you may have no rows of data returned.

2. When you query such a tag using the OLE-DB provider with a select <tagname> on the TrendView table the call may return an error.

 

Solution:
The parameter

[GENERAL]
TagStartDigit

must be set to 1 on both the Citect runtime client and the Trend Server.

CIT has confirmed this to be a problem in Citect for Windows versions 5.21 to 5.31. We are researching this problem and will post new information here as it becomes available.

 
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