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62
Write Protection
Section 5-5
If the end address is set to 00 (hex), the entire area except for address 0000
(hex) will be write-protected.
Example: End Address Set to 00 (hex)
Clearing Write Protection
To clear write protection, set bit 7 of address 0000 (hex) to 0. Write protection
will be cleared and the end address set in address 0000 (hex) will be dis-
abled. When clearing write protection, write only to the write protection setting
area (1 byte starting from address 0000). If other addresses are written to, a
write protection error will occur and write protection will not be cleared.
5-5-2
SRAM (Built-in battery) Data Carriers
Setting Write Protection
The write protection setting uses 4 bytes of the Data Carrier, from address
0002 (hex) to 0005 (hex). Write protection can be enabled and disabled by
setting bit 7 of address 0002 (hex).
Write Protection Bit
Write Protection Setting Range
Address
Bit No.
7
6
5
4
3
2
1
0
0000
1
0
0
0
0
0
0
0
8
0
Address (hex)
0000
0001
00FD
Write-protected
area
Address
Bit No.
7
6
5
4
3
2
1
0
0002
Pro-
tected/
Not
pro-
tected
Leftmost 2 digits of start address
0003
Rightmost 2 digits of start address
0004
Leftmost 2 digits of end address
0005
Rightmost 2 digits of end address
Address 0002 (hex), bit 7
Description
1
Enable write protection.
0
Disable write protection.
Address
Write protection setting range
Start address
0006 (hex) to 7FFF (hex)
End address
0006 (hex) to FFFF (hex)
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...