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32 MEMORY SPECIFICATIONS
32.2 File Size Unit in Memory
Safety devices and safety labels cannot be latched, and therefore there is no latch area for safety devices and
safety labels.
32.2 File Size Unit in Memory
The following table lists the unit of the file size (cluster size) of the Safety CPU memory.
Data is written in the unit of the file size (cluster size). For example, when 464 bytes of CPU parameter is
written to the data memory on R08SFCPU, it is written as 2048 bytes of data because the file size unit of the
data memory is 2048 bytes.
32.3 Memory Operation
Using an engineering tool, each memory can be initialized and cleared to zero. For details on the operation method, refer to
the following.
GX Works3 Operating Manual
• If the power goes off during initialization or zero clear, the memory is left in the state of that point, and it is
necessary to re-execute the memory operation.
• Following initialization, write the file required to run the Safety CPU. ( GX Works3 Operating Manual)
• Following data memory initialization, if the power is turned off and on or reset, the device/label memory will
revert to the default status (default capacity for each area).
Safety CPU File size unit
Program memory Device/label memory Data memory
R08SFCPU 128 bytes 512 bytes 2048 bytes
R16SFCPU 4096 bytes
R32SFCPU 8192 bytes
R120SFCPU 16384 bytes
Items to be specified in the engineering tool Target
Initialization Data memory Deletes all the folders and files in the program memory and data
memory.
Device/label memory Deletes all the files in the file storage areas in the device/label memory.
SD memory card Deletes all the folders and files in the SD memory card.
Value clear Device, label Zero clear Excluding devices and labels with latch specified, clears the following to
zero: X, Y, M, B, F, SB, V, T, ST, LT, LST, C, LC, D, W, SW, FX, FY, FD, Z,
LZ, RD, SA\X, SA\Y, SA\M, SA\B, SA\T, SA\ST, SA\C, SA\D, SA\W, and
all labels (including module labels).
Zero clear (including Latches (1) and (2)) Including devices and labels with latch specified, clears the following to
zero: X, Y, M, B, F, SB, V, T, ST, LT, LST, C, LC, D, W, SW, FX, FY, FD, Z,
LZ, RD, SA\X, SA\Y, SA\M, SA\B, SA\T, SA\ST, SA\C, SA\D, SA\W, and
all labels (including module labels).
File register Zero clear All files Clears the contents of all the file registers to zero.
File specification Clears only the contents of the specified file register(s) to zero.
Zero clear excluding Latch (2) Clears the file registers other than Latch (2) to zero.
Device/label/file register latch clear Clears devices, labels, and file registers other than Latch (2) to zero.
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