Jetter AG
Programming | 7
JVM-104-O15 User Manual
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Properties
The properties of the internal flash disk drive are listed below:
■
Up to 7 directory levels and 1 file level are allowed.
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No case sensitivity.
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Directory and file names with a length of up to 63 characters are possible.
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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.
7.7.6 USB flash drive
USB memory ex-
pansion
An optional USB flash drive lets you expand the storage capacity of the internal
memory.
■
Tested storage capacities range from 256 MB … 8 GB.
■
No case sensitivity.
■
The USB stick must be formatted using FAT 16 or FAT 32.
■
For directory and file names up to 260 characters are allowed.
■
The following characters are not permitted in directory and file names: "/", "\",
":", "*", "?", "<", ">" and "|"
■
There is no user/access administration.
Jetter AG cannot guarantee the proper functioning of all USB flash drives avail-
able on the market.
7.7.7 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.
7.7.8 Special registers
Special registers let you control OS functions and retrieve status information.
Properties
■
Global variables with dedicated addresses (%VL)
■
When the operating system is launched, special registers are initialized using
their default values.
■
Register numbers: 100000 ... 999999
Type of access
■
By JetSym
■
By browser (via HTTP server)
■
From HMIs
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From the application program
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From other controllers
