448
Program Protection
Section 8-7
Auxiliary Area Words
Write-protection
Using Passwords
The program (or selected tasks) can also be write-protected if the write pro-
tection option is selected from the CX-Programmer when a password is being
registered for the entire program or those selected tasks. The write protection
setting can prevent unauthorized or accidental overwriting of the program.
Note
1.
If the selected tasks are write-protected by selecting this option when reg-
istering a password, only the tasks (program) that are password-protected
will be protected from overwriting. It will still be possible to overwrite other
tasks with operations such as online editing and task downloading.
2.
All tasks (programs) can be overwritten when program read protection is
not enabled.
Name
Address
Description
User Program
Date
A90 to A93
The time and date the user program was last over-
written in memory is given in BCD.
A90.00 to A90.07
Seconds (00 to 59 BCD)
A90.08 to A90.15
Minutes (00 to 59 BCD)
A91.00 to A91.07
Hour (00 to 23 BCD)
A91.08 to A91.15
Day of month (01 to 31 BCD)
A92.00 to A92.07
Month (01 to 12 BCD)
A92.08 to A92.15
Year (00 to 99 BCD)
A93.00 to A93.07
Day (00 to 06 BCD)
Day of the week:
00: Sunday, 01: Monday,
02: Tuesday, 03: Wednesday,
04: Thursday, 05: Friday,
06: Saturday
Parameter Date
A94 to A97
The time and date the parameters were last overwrit-
ten in memory is given in BCD. The format is the
same as that for the User Program Date given above.
MAC Address:
01234567890A
00
NC
02
04
06
08
10
00
02
04
06
08
10
01
COM
03
05
07
09
11
01
03
05
07
09
11
BKUP
ERR/ALM
LNK/ACT
SYSMAC
CP1L
POWER
RUN
INH
1
00
01
02
03
04
06
00
01
03
04
06
COM
02
COM
05
07
COM
COM(V+)
05
07
ANALOG INPUT
V1+ V2+ COM
2
CX-Programmer
Password?
When a password is being registered for the entire user
program or selected tasks, program write-protection can be
enabled/disabled with an option setting.
The user program cannot be overwritten.
CPU Unit
Overwriting can be prohibited with password protection,
regardless of the DIP switch setting.
Memory Cassette
The user program cannot be overwritten.
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
Page 4: ...iv...
Page 10: ...x...
Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
Page 855: ......