File System - KEB PCC C5 Betriebsanleitung

COMBICONTROL
4.5

File system

The file system consists of an internal built-in flash memory (drive C:) and an optionally
external plugged-in memory card (drive A:). Access can occur via CoDeSys or directly from
the program of the control.
Internal flash memory
This memory is accessed as drive C: and the boot project can be stored, which is automatically
loaded and started when switching on. Any other files (documentation, download lists, prescrip-
tions, etc.) can be stored and read here. The following particularities must be observed:
• Access is possible only to files in the root directory.
• Only short file names (8.3 format) are possible.
• Reading takes place with high speed and can occur also at any time in the time-critical
cyclic operating modes of the control.
• Writing occurs at a slow rate, because the flash must be programmed here. Any data can
be written if the control is in stop condition, but only one file can be opened for writing. If
the control is in run condition, only blocks of max. 32KByte can be written into the opened
file. As soon as this block was completely stored in the background the next data can be
written.
• Data is not physically deleted. First they are internal marked as deleted. Thus the free
available memory space decreases. The command "fileformat" can be used via the CoDe-
Sys PLC browser. Thus the complete memory is formatted again. All data is irrevocable
deleted.
• The deleted memory space can be make available again with the command "filecleanup"
without reformatting.
External memory card
A SD or MMC memory card of any capacity can be plugged-in into the slit-in unit of the ope-
rating unit. This memory is accessed as drive A:. Any files can be stored and read here, too.
The following particularities must be observed:
• The file system is FAT16 and thereby compatible to external memory card readers and
Windows operating systems.
• Access is possible only to files in the root directory.
• Only short file names (8.3 format) are possible.
• Reading and writing is not possible in cyclic operating modes. The card is completely igno-
red.
• The write protection switch (at SD cards) is not considered, writing on the card is always
possible.
Note:
The standard drive of C: can be changed to A: via CoDeSys PLC browser. Thus files can be
written and read via CoDeSys to the internal memory or the external memory card.
GB - 17