turck BL20-PG-EN-V3, User Manual, Page: 62 / 78

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6 USB Host port functions
The USB Host port serves for connecting USB storage devices for the storage, restore and transfer of
CODESYS applications as well as for updating the device firmware.
6.1 Compatible storage devices
The USB Host port is generally suitable to connect commercially available USB storage devices.
Depending on the current consumption of the devices, compatibility problems may occur in iso-
lated cases.
In order to guarantee error-free operation, we recommend to use industrially tested storage
devices. Ident-Nr. 6827348 - USB 2.0 Industrial Memory Stick.
6.2 Functions of the USB Host port
For further information, see Function overview (page 63) .
 Read access

The read access does not require a user intervention.

The CODESYS program continues to run.
– BACKUP_1: Storing the CODESYS application on the storage device
– BACKUP_2: Storing the CODESYS application and further device data on the storage device
– USB_DATA: Storing of CODESYS recipes and/or log-fileson the storage device.

Write access

The write requires user intervention (press the SET-button for at least 3 seconds).

The CODESYS program is stopped.
– RESTORE_1: Loading the CODESYS application from the storage device to the device.
– RESTORE_2: Loading the CODESYS application and further device from the storage device to
the device.
– USB_DATA_WRITE: Loading of CODESYS recipes and/or log-files from the storage device to the
device
– FW_UPDATE
NOTE
The USB Host function can be deactivated using the web-server of the CODESYS program
(bit 14 of the device parameter object).
NOTE
Only use USB memory sticks formatted to FAT or FAT32. The use of memory sticks format-
ted to NFTS is not possible.
NOTE
Connecting other USB devices like for example hard disks, keyboards, computer mouses
etc. is not possible.