Omron CP1H-CPU - 05-2006, Operation Manual

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Program Protection
Section 6-6
2. The entire program can be transferred to another CPU Unit even if individ-
ual tasks in the program are read-protected. The task read protection will
remain in effective for the password-protected tasks.
3. When the CX-Programmer is used to compare a user program in the com-
puter's memory with a user program in the CPU Unit, password-protected
tasks will be compared too.
Restrictions to Function
Block Use Function block definitions can be read even if the entire program or individual
tasks in a program containing function blocks are read-protected.
Auxiliary Area Flags and Bits Related to Password Protection
6-6-2 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.
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