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CHAPTER 3 FUNCTIONS
3
3.37 Write-Protect Function for Device Data (from Outside the CPU Module)
3.37.2 Target devices
3.37.2 Target devices
This section describes the devices that can be write-protected from outside the CPU module. Device data writing by
digit specification of bit data, bit specification of word, and index modification cannot be performed when it is specified
in the write-protected range.
One write-protected range can be set per device.
*1 The extended data register and extended link register are included.
*2 When the file register in the block switching method (R) is specified from the SLMP/MC protocol, the write-protected
range depends on the block number which is enabled.
When the write-protect function for device data (from outside the CPU module) is enabled, device data writing by indirect
specification cannot be executed regardless of the write-protected range specification.
Device data writing by the following files cannot be executed.
*1 The initial device value file cannot be written as long as this function is enabled, even if the write-protected range set
does not include the device set as the initial device value range.
*2 When the write-protected range is set for the file register, the file register file cannot be written.
Even when the write-protect function for device data (from outside the CPU module) is enabled, files can be deleted
(including format of the CPU memory).
The following table provides the availability of writing of files by the setting of the PLC file.
×: File cannot be written
Device type
X(DX), Y(DY), M, L, B, F, SB, V, S, T, ST, C, D
*1
, W
*1
, SW, Z, ZR(R)
*2
File type Condition under which writing of files is inhibited
Initial device value file
The write-protect function for device data (from outside the CPU module) is enabled.
*1
File register file
The write-protected range is set for the file register (ZR (R)), extended data register (D), and extended
link register (W).
*2
Item
Initial device value file File register file
Device in the
write-protected
range
Device out of the
write-protected
range
Device in the
write-protected
range
Device out of the
write-protected
range
Not used ××××
Use the same file name as the program××××
Use the following file ××××
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