PACiS GTW GTW/EN T/C40, Техническое руководство

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GTW/EN CT/C40 Communication
Page 28/64 PACiS Gateway
3.7 SOE file management
The number of SOE files, SOE104 files, in the directory defined by keys Drive+Path is
limited. When the limit is reached, the oldest file is replaced by a new one.
A SOE file creation is divided into 3 steps:
- until the maximum number of events in a SOE number is reached, events are stored
in a xxxx.tmp file, where xxxx is the IEC name (number in [1…65535],
- when the xxxx.tmp file is full, it is immediately in xxxx.tmp_ready,
- every 20 seconds the dll looks for .tmp_ready files: if any, it tries to rename it in
.SOE104 file. If the file couldn’t have been renamed, a new trial will be done
20 seconds later, an so on. In a normal processing, the only thing which prevents from
renaming a .tmp_ready in a .SOE104 is when the directory is full and the oldest file is
being read by the SCADA (i.e. this oldest file cannot be deleted and replaced by the
new .tmp_ready). When the file is successfully renamed, a “directory” ASDU is sent
with Cause of Transmission = spontaneous.
When the dll starts, some .tmp and .tmp_ready can be present in the directory: .tmp will be
then renamed in .tmp_ready, and .tmp_ready will be renamed in .SOE104, as in the normal
processing, but no “directory” ASDU will be sent. However that may be, “directory” ASDU is
never sent on dll starting.
“directory” ASDU is sent when a new SOE file appears in the directory or, if
delete_file_after_read registry key is set to 1, after a file deletion. “directory”. ASDU is not
sent if the SCADA deletes a file explicitly with ASDU F_SC_NA_1 (122).
IOA and file name management:
The directory content is ordered by increasing file name: base IOA generally fit to oldest file,
which name (=IEC name = a number) is the smallest (exception if files a 1, 2, 65534, 65535).
Example (=”dir” ASDU content):
- 25.SOE104 IOA = 1000
- 26.SOE104 IOA = 1001
- 27.SOE104 IOA = 1002
- 28.SOE104 IOA = 1003
If file 25.SOE104 is read and deleted, the “dir.” ASDU content will become:
- 26.SOE104 IOA = 1000
- 27.SOE104 IOA = 1001
- 28.SOE104 IOA = 1002
Or if file 25.SOE104 is replaced by 29.SOE104
- 26.SOE104 IOA = 1000
- 27.SOE104 IOA = 1001
- 28.SOE104 IOA = 1002
- 29.SOE104 IOA = 1003
Only one file can be transferred at a time, it’s not possible to read 2 files or more
simultaneously: i.e if a file is currently selected, a selection on a second file will be refused.
If a loss of communication with the SCADA occurs while a transfer is in progress, on
communication recovery the processing has to be resumed from the beginning.
A SOE104 file is a binary file, which contains only the ASDUs (no other information is
present in the file).