67
Data Carrier Life Check
Section 5-6
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
Data Carrier can be managed by updating the number of writes value when
data is written to the address most frequently written. (The Data Carrier has a
limited life for any one address, 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.
Note
1.
For any one Data Carrier, use only an Add specification or a Subtract spec-
ification for the Number of Writes Control command. If both specifications
are used for the same Data Carrier, the number of writes control will not be
possible.
2.
The number of writes value can be set as high as 16,700,000 write. The
life of an EEPROM Data Carrier, however, is 300,000 writes (= 0493E0
(hex)) at 40
°
C or lower. Do not set values that exceed 300,000.
Application Example
The following example uses 3 bytes starting at address 0010 (hex) as the
number of writes control area.
1,2,3...
1.
A Write command is executed to set the control area to 300,000 writes.
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
Address
7
0
000F
0010
0
4
0011
9
3
0012
E
0
0013
(hex)
Bit
Bit
Summary of Contents for CJ - 12-2004
Page 2: ...SYSMAC CS CJ Series ID Sensor Units Operation Manual Revised December 2004...
Page 3: ...iv...
Page 11: ...xii...
Page 55: ...36 Connections and Wiring Section 3 4...
Page 69: ...50 I O Data Allocations Section 4 3...
Page 91: ...72 Data Check Section 5 7...
Page 141: ...122 Sample Programming Appendix B...
Page 147: ...128 Revision History...