Various problems exist in the trend export
cicode which have been fixed in version 5.00. Following is a list
of the problems which existed in the functions TrnExportCSV(),
TrnExportDBF(), TrnExportClip() and TrnExportDDE().
- These functions will now return 0 if successful, or otherwise
an error code. (As stated in the Citect Programmer's Reference).
Previously, these functions returned the number of samples exported
and generated hardware alarms or error messages in the event of an
error.
- If no trend tags were specified, the error message "Attempt to
export trend data has failed" was displayed. The functions will now
return the error code 301.
- If the Time argument was greater than the current time, then
the output values were timestamped from that time. (in the future).
These functions now recognize this problem and set the time to the
current time.
- Generated a file even if no samples were exported.
- If there was a problem opening the scratch device used for the
output of the TrnExportDBF() function, then the hardware alarm
"Cicode General Cannot open file DevOpen Scratch " was generated.
This problem is now indicated by the function returning the error
code generated when opening the file.
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