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CHAPTER 3 FUNCTIONS
3
3.37 Write-Protect Function for Device Data (from Outside the CPU Module)
3.37 Write-Protect Function for Device Data (from Outside the
CPU Module)
This function disables device data writing (including the file register) from outside the CPU module such as the
programming tool, GOT, SLMP/MC protocol, and FTP to the write-protected range set in the parameter. Desired
device data can be protected from tampering.Note 3.25
Even when the write-protected range is set, the operation of the CPU module which is set and device data writing by
the execution of functions (device data writing by instructions and internal device data writing by initial device value
setting, boot operation, and CPU module data backup/restoration function) are not inhibited.
Note 3.25
The write-protect function for device data (from outside the CPU module) can be used only with the High-speed Universal
model QCPU and Universal model Process CPU. When using the write-protect function for device data (from outside the
CPU module), check the versions of the CPU module and programming tool used. ( Page 465, Appendix 2)
: Can be written (function/instruction can be executed)
×: Cannot be written (function/instruction cannot be executed)
Universal
M0, D0 =
M200, D10000, ZR100 =
M0, ZR0 =
ZR100 =
D0 =
D10000 =
D0 =
D10000 =
MM
DD
ZRZR
M0
M200
D0
D10000
ZR0
ZR100
M0, D0, ZR0 =
M200, D10000, ZR100 =
M0, D0 =
D10000, ZR100 =
Writing device data
from an external device
â–ª Internal operations by using
instructions
â–ª Setting of initial device values
â–ª Link refresh
Writing device data
from the programming tool
Writing device data
from GOT
Simple PLC communication
function (writing data to
a destination device)
Writing device data by
using network dedicated
instructions
â–ª Boot operation
â–ª CPU module change function with memory card
â–ª CPU module data backup/restoration function
Device memory
Standard RAM
: Writing enabled
: Writing disabled
=
=
=
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