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447
Program Protection
Section 8-7
Auxiliary Area Flags and Bits Related to Password Protection
8-7-2
Write Protection
Write-protection
Using the DIP Switch
The user program can be write-protected by turning ON pin 1 of the CPU
Unit’s DIP switch. When this pin is ON, it won’t be possible to change the user
program or parameter area (e.g., PLC Setup and routing tables) from the CX-
Programmer. This function can prevent the program from being overwritten
inadvertently at the work site.
It is still possible to read and display the program from the CX-Programmer
when it is write-protected.
CPU Unit DIP Switch
Confirming the User Program Date
The dates the program and parameters were created can be confirmed by
checking the contents of A90 to A97.
Name
Bit
address
Description
UM Read Protection
Flag
A99.00
Indicates whether or not the PLC (the entire user
program) is read-protected.
OFF: UM read protection is not set.
ON: UM read protection is set.
Task Read Protection
Flag
A99.01
Indicates whether or not selected program tasks
are read-protected.
OFF: Task read protection is not set.
ON: Task read protection is set.
Program Write Protec-
tion for Read Protec-
tion
A99.02
Indicates whether or not the write protection
option has been selected to prevent overwriting of
password-protected tasks or programs.
OFF: Overwriting allowed
ON: Overwriting prohibited (write-protected)
Enable/Disable Bit for
Program Backup
A99.03
Indicates whether or not a backup program file
(.OBJ file) can be created when UM read protec-
tion or task read protection is set.
OFF: Creation of backup program file allowed
ON: Creation of backup program file prohibited
Pin
Name
Settings
SW1
User Program Memory Write Protection
ON: Protected
OFF: Not protected
Содержание CP1L-EL20DR-D
Страница 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
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Страница 22: ...xxii...
Страница 34: ...xxxiv Software Licenses and Copyrights 7...
Страница 178: ...144 Connecting the CX Programmer Section 5 1 Click the Connect button to connect and then connection online is completed...
Страница 192: ...158 Trial Operation and Debugging Section 5 3...
Страница 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Страница 666: ...632 Trouble Shooting Section 11 7...
Страница 696: ...662 Standard Models Appendix A...
Страница 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Страница 836: ...802 PLC Setup Appendix G...
Страница 838: ...804 TCP Status Transitions Appendix H...
Страница 840: ...806 Ethernet Network Parameters Appendix I...
Страница 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Страница 844: ...810 Ethernet Specifications Appendix K...
Страница 851: ...Index 817 work words 118 write protection 447...
Страница 852: ...818 Index...
Страница 854: ...820 Revision History...
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