Omron V670 Series, User Manual

Page: 71 / 143

4-11
The Write Protect Function prevents a fixed data, such as pallet information or product information stored in memory in a tag, being
erased by careless writing.
By setting protect information in the tag, Write Protect can be enabled in any area (a maximum of two areas) of a specified address. If
you try to write anything into a write-protected page, a Protect error occurs.
The protect area information is set by using a part (address $0000 to 0003) of user data area.
To enable the Write Protect, write the protect area information into a specified address and specify "Protect Setting" with process desig-
nation parameter using a tag function setting command (TF). Similarly, to disable the Write Protect, specify "Disable" with the process
designation parameter.
♦
Relation between Protect information and Protect area
* Available range of Protect area: 0004h to 007Fh
User Address Description Example of data
$0000 Start address of Write Protect area 1 05h
$0001 End address of Write Protect area 1 10h
$0002 Start address of Write Protect area 2 70h
$0003 End address of Write Protect area 2 75h
$0004
User Area
$0005
Write Protect area 1
.
.
$0010
$0011
.
.
$006F
$0070
Write Protect area 2 .
.
$0075
$0076
$007F
Correct Usage
If you use the Write Protect function, the area $0000 to 0003 cannot be used as a data area. Also, if you enables the
Write Protect function, the communication time is prolonged (approximately 3 ms).
4-6 Write Protect Function