Jetter AG
Programming | 7
JCM-501-E00 User Manual
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All characters except "/" and ".." are permitted for directory and file names
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The location of the directories "App" and "Data" is on the flash disk drive.
7.8.6 USB flash drive
USB memory ex-
pansion
An optional USB flash drive lets you expand the storage capacity of the internal
memory.
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Tested storage capacities range from 256 MB … 8 GB.
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No case sensitivity.
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The USB stick must be formatted using FAT 16 or FAT 32.
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For directory and file names up to 260 characters are allowed.
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The following characters are not permitted in directory and file names: "/", "\",
":", "*", "?", "<", ">" and "|"
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There is no user/access administration.
Jetter AG cannot guarantee the proper functioning of all USB flash drives avail-
able on the market.
7.8.7 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.
7.8.8 Flag
Flags are one-bit operands. This means they can either have the value TRUE or
FALSE.
Properties
of user flags
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Global variables which are assigned to permanent addresses (%MX)
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Non-volatile
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Quantity: 256
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Flag numbers: 0 ... 255
Properties
of overlaid
user flags
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Global variables which are assigned to permanent addresses (%MX)
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Non-volatile
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Overlaid by registers 1000000 ... 1000055
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Quantity: 1,792
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Flag numbers: 256 ... 2047
Properties of spe-
cial flags
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Global variables which are assigned to permanent addresses (%MX)
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When the operating system is launched, special flags are initialized using their
default values.
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Quantity: 256
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Flag numbers: 2048 ... 2303
