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Program Protection Section 6-7
2. Go online and then either select
PLC - Transfer - To PLC
to transfer the
program or select
PLC - Protection - Set Password
and click the OK but-
ton.
Application
The above procedure enables using a password to protect against disclosure
of the program to unauthorized persons.
Note (1) Copying the program is possible if read protection is not set.
(2) The setting to prohibit backing up the program is not effective until the
program is transferred to the PLC. Always transfer the program after
changing the setting.
Auxiliary Area Flags and Bits Related to Password Protection
▲
Properties
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
UM Read Protection
Release Enable Flag
A99.12 Indicates when UM read protection cannot be
released because an incorrect password was
input five times consecutively.
OFF: Protection can be released
ON: Protection cannot be released
Task Read Protection
Release Enable Flag
A99.13 Indicates when task read protection cannot be
released because an incorrect password was
input five times consecutively.
OFF: Protection can be released
ON: Protection cannot be released
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