Flow of Data Collection
Collected data is stored in the internal buffer, where the data is partitioned at END processing and saved in the SD memory
card. When a trigger is generated, the END process will take longer than usual.
SD memory card
• If a user interrupt occurs while transferring the device data to the internal buffer, a data inconsistency will occur.
• If a user interrupt occurs while transferring double-word devices, an inconsistency will occur in the high-order and low-order
Effect on the scan time
If the memory dump function detects a trigger, the scan time will increase by approx. 12 ms when collecting the data. Transfer
to the SD memory card does not affect the scan time.
Memory Dump File
This file stores data that is collected through memory dump (collection result by memory dump). Data collected by one
execution is saved in one file. The memory dump file is saved in a binary format and stored under the "MEMDUMP" folder.
Save file name
The file name can be arbitrarily set within a range of 64 characters (extension and period included) together with an
autoassigned number (00 to 99). Specify the save file name in the memory dump settings. (GX Works3 Operating Manual)
*1 Between a specified file name (MEMDUMP) and an auto-assigned number (00), the single-byte underbar (_) is added.
If a file name with 5 or less characters is specified, the lowercase characters used in the file name may be handled as uppercase
When the memory dump function is registered, the debug folder (DEBUG (fixed)) and the memory dump folder (MEMDUMP
(fixed)) are created in the SD memory card. The memory dump file (result file) is stored in the memory dump folder. One folder
can contain a maximum of 100 files. If any file does not exist in creating a save file, the file with the number 00 is created. If
any file already exists in creating a save file, the behavior is as follows:
Number of files
For less than 100
For 100 (maximum)
*2 If the corresponding file number is 99, a file with file number 00 is created.
20 MEMORY DUMP FUNCTION
20.4 Flow of Data Collection
Creates a file
assigning the number obtained by adding 1 to the number of the file where the creation date and
time is the latest.
Deletes the file where the creation date and time is the oldest and creates a new file using the deleted number as
Writing of sampling data