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Programming | 7
JVM-104-O09 User Manual
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7.4.5 Flash disk
Data can be stored directly on the flash disk. The following rules apply when us-
ing a flash disk:
■
Do not open more than 8 files at a time.
■
Separate directory names by a slash “/”.
■
The properties of all created files hold their creation date and time as provided
by the controller.
■
Date, time, and file size are not available for all system files.
Flash disk
Capacity
The following disk space is available to the user:
Parameter
Value
Flash disk capacity,
total
512 MB
Size of folder
App
(of the
a.m. capacity)
64 MByte
Size of folder
Data
(of the
a.m. capacity)
368 MByte
Tab. 29:
Flash disk capacity
Properties
The properties of the internal flash disk drive are listed below:
■
Up to 7 directory levels and 1 file level are allowed.
■
No case sensitivity.
■
Directory and file names with a length of up to 63 characters are possible.
■
All characters except "/" and ".." are permitted for directory and file names
■
The location of the directories "App" and "Data" is on the flash disk drive.
7.4.6 Storing registers and variables
Storing to a non-
volatile (remanent)
memory
Registers and variables of the application program can be globally stored to a
non-volatile memory with dedicated registers.
The register variables %VL are always 4 bytes in size. They are not initialized by
the operating system.
These %RL registers always occupy 480,000 bytes.
The number of %VL register variables is limited to 120,000.
The register array for %VL or %RL ranges from 1000000 to 1119999.
Storing to volatile
(non-remanent)
memory
Variables of the application program can be stored to volatile memory.
Global variables that do not have a static assignment to addresses and are
stored compactly.
Their register number starts with the value 0.
7.4.7 Flag
Flags are one-bit operands. This means they can either have the value TRUE or
FALSE.
Properties
of user flags
■
Global variables which are assigned to permanent addresses (%MX)
■
Non-volatile
■
Quantity: 256
■
Flag numbers: 0 ... 255
Properties
of overlaid
user flags
■
Global variables which are assigned to permanent addresses (%MX)
■
Non-volatile
■
Overlaid by registers 1000000 ... 1000055
