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Auxiliary Area Allocations by Function Appendix C
Information on Read Protection Using a Password
Name Address Description Access Updated
UM Read Protection Flag A99.00 Indicates whether the entire user program in the PLC is
read-protected.
OFF: UM not read-protected.
ON: UM read-protected.
Read-only
Task Read Protection Flag A99.01 Indicates whether read protection is set for individual
tasks.
OFF: Tasks not read-protected.
ON: Tasks read-protected.
Read-only
Program Write Protection for
Read Protection
A99.02 Indicates whether the program is write-protected.
OFF: Write-enabled.
ON: Write-protected.
Read-only
Enable/Disable Bit for Pro-
gram Backup
A99.03 Indicates whether creating a backup program file (.OBJ)
is enabled or disabled.
OFF: Enabled.
ON: Disabled.
Read-only
UM Read Protection
Release Enable Flag
A99.12 Indicates when UM read protection cannot be released
because an incorrect password was input five times con-
secutively.
OFF: Protection can be released
ON: Protection cannot be released
Read-only
Task Read Protection
Release Enable Flag
A99.13 Indicates when task read protection cannot be released
because an incorrect password was input five times con-
secutively.
OFF: Protection can be released
ON: Protection cannot be released
Read-only
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