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Lock Function
Section 3-3
3-5
3-3
Lock Function
The Lock function protects against data being erased due to the unintentional
overwriting of fixed data stored in the Tags.
There is a lock setting area in the Tag’s system area, so you can write-
protect user-defined areas by page. If a write command is performed on a
page that is write-protected, a write processing error will occur.
The lock setting area is configured using one bit per page, to a total of 12 bits
of data. Make the lock settings using the Lock Command (LK).
Refer to 5-3-6 System Commands and Responses for details.
Lock setting area
1 byte
1 byte
b7
b6
b5
b4
b3
b2
b1
b0
b7
b6
b5
b4
b3
b2
b1
b0
Page 1
0
Page 0
9
Page 0
8
Page 0
7
Page 0
6
Page 0
5
Page 0
4
Page 0
3
Page 0
2
Page 0
1
Page 0
0
Fam
ily cod
e
and
appl
ica
tion
ID
Fixe
d v
a
lu
e
0
Fixe
d v
a
lu
e
0
Fixe
d v
a
lu
e
0
Fixe
d v
a
lu
e
0
Note: With the Lock function used in the V720 Series, you cannot turn OFF the lock
settings. Data cannot be written twice to pages that are write-protected, so
be careful when using the function.