Flashdisk

The Flashdisk is an internal remanent mass storage device and can be used for any application purpose. It has a memory capacity of 4 GB (preformatted).

It is capable of high data throughput, but the actual achievable throughput is also use case depended. If the performance seems to get insufficient, check the following factors:

• High CPU load of the PLC:

  Reduce overall CPU load of the PLC to have more performance for file operations

• Low available free space on the device:

  Cleanup disk to free space

  Cluster size is 4 kB - Consider this in your application design to achieve optimal usage of the flashdisks space and access performance (e.g. 10 files with 10 Byte each require 10*4 kB disk space, while 1 file with 100 Byte requires only 4 kB).

• Fragmentation of the device:

  Cleanup disk to free space.

Name	Flashdisk
Description	Internal mass storage
Size	Product specific, see table Memory Sizes Introduction AC500 Storage Devices
IEC access	CAA_File_Library: CAA_File Library Contents
FTP access	FTP user = “flashdisk”
Diagnosis device number	33