Omron CJ1W-V680C11, Руководство пользователя

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SECTION 5
RF Ta
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RFID System
User's Manual
SECTION 5
ID Sensor Unit Functions

Number of Writes Control 2 (Life Control = User Setting)
The Number of Writes Control Area consists of 3 bytes from the
start address. The Number of Writes Control command is
executed with a Subtract specification. The specified number of
writes is subtracted and the result is written to the control area.
Therefore, to enable control of the number of writes, the
maximum number of writes must be written to the Number of
Writes Control Area beforehand. The user-specified number of
writes can be set to up to 16,700,000. The specified number of
writes for EEPROM RF Tags, however, is 100,000 writes
(0186A0 hex) at 25
°
C max., so be sure to set the number of
writes to 100,000 or less. When the value in the number of writes control area is less than 0, the Status
Flag (CIO n+8, bit 04) in the Results Information turns ON. If the value in the control area is already
less than 0, the value will not be changed.
• Application Method
A user-specified number of writes can be used for life control by writing the desired value in the
Number of Writes Control Area in advance. The life of the RF Tag can be managed by updating the
number of writes value when data is written to the address most frequently written. (The RF Tag has a
limited life for any one block of 8 bytes, so the number of writes must be counted for the address that is
written most frequently.) It is also possible to confirm the number of writes without updating number of
writes value.
Area start
address
Upper digit
Middle digit
Lower digit
3 bytes
Data written
No. of writes updated/
life checked
Life checked
Write stage
Life confirmation
stage