What happens?
Although opening a file with AM_APPEND_PLUS mode, new data is not attached to the open file, but a new file is created.
When does the problem occur?
With the SysFileOpen function from the SysFile library, there is always a new file created when the AM_APPEND_PLUS mode is selected at the function input.
Which products are concerned?
PLC Designer V3.0 and higher
SysFile.lib library
Possible diagnostics:
None
Short-term measures/recommendations:
Use the CAA_File.lib library instead of the SysFile.lib library.
Assessment:
Although selecting the AM_APPEND_PLUS mode (attach data to file), an existing file is overwritten when using the SysFile.lib library. When using the CAA_File.lib library, data can be attached to a file.
