Function Block FS_ISFILE

The Function Block FS_ISFILE checks whether a file exists.

The File System must have been initialized beforehand using FS_INIT. All operations are performed asynchronously per configured storage medium.

Input CHECK

A positive edge triggers the search for the file on the storage medium.

Input DEV

Defines the device from which files should be accessed. The device is used per project and can be managed in the context menu under Project ▸ External Storage.

Input PATH

Specifies the path to the file on the storage medium. The path corresponds to a Unix file path in UTF-8 format, if supported. The path is represented as follows:

Folder/Subfolder/File.txt

Output DONE

The output returns a pulse upon success to perform the next operation. The pulse occurs when the process ends, even if an error has occurred.

Output EXISTS

The output is true if the file was found. The state is stored for later use.

Output ERROR

In case of an error, returns a text with an error message. This is FALSE if no error has occurred. The state is stored for later use.

Possible causes:

• The storage medium service was not started.
• The storage was not initialized.
• The login credentials are invalid.
• The remote server could not be reached.
• The storage medium does not exist.
• The specified path is invalid.