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CHAPTER 3 FUNCTIONS
3
3.37 Write-Protect Function for Device Data (from Outside the CPU Module)
3.37.3 Operations and functions that cannot be executed for devices in write-protected range
(1) SLMP/MC protocol
An error occurs when the following operations are performed to devices in the write-protected range from an
external device such as a personal computer via the SLMP/MC protocol: writing/clearing of device data,
writing/changing of the initial device value file or file register file.
An error also occurs when the following commands are executed in the predefined protocol support function or
the SLMP frame send instruction.
• Writing or clearing device data by using the SLMP/MC protocol
• Writing or changing the initial device value file or file register file by using the SLMP/MC protocol
*1 The operation cannot be performed only when the open mode is for writing (0100H).
*2 The operation cannot be performed only when the extension is changed to QDI (initial device value) or QDR (file
register). (Subcommand: 0001, 0002)
For details on commands, refer to the following.
SLMP Reference Manual
MELSEC Communication Protocol Reference Manual
Classification Operation
Command
SLMP and
4C/3C/4E/3E
frame
2C frame 1C frame 1E frame
Writing to device
Batch write 1401
3BWJW02H
4WWQW03H
Random write (Test) 1402
6BTJT04H
7WTQT05H
Multiple blocks batch write 1406 - - - -
Clearing device
Remote RUN when clearing is
specified in the clear mode
1001 - - - -
Remote latch clear 1005 - - - -
Classification Operation
Command
SLMP and 4C/3C/4E/3E frame
Writing to file
New file creation
1820
1202
File copy
1824
1206
File change
File open
1827
*1
File information modification
1204
*2
File write
1829
1203
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