PART 1: CX-Programmer
CHAPTER 5 – Advanced Topics
OMRON
CX-Programmer _Page 124
C-Series PLCs
For certain C-series PLCs the password is embedded in the program using a specific ladder construct and is not
specified on the PLC properties page. The password must be entered as four hexadecimal digits as shown below.
Check the availability of password protection in the appropriate manual for the PLC.
The program must first be set up with an open contact with the address ‘AR10.01’ applied. The password
protection can then be applied. The password can be any four-digit number. To set the password, select the
Protection
tab within the PLC Properties dialog. The following example illustrates the functionality of the
password protection, with the password of ‘1111’.
When enabled, the password is required every time the program is accessed. To set and release the protection
after the program is protected, select
Protection Write Protect
from the
Transfer
menu.
CV-Series PLCs
Two levels of password protection are provided for CV-series PLCs, ‘System protection password’ and ‘Partial
protection password’, both of which are set on the PLC Properties dialog.
The ‘System protection password’, specified as a four-digit hexadecimal value, provides overall protection for
the whole of program memory.
It is possible to protect several programs or chapters of programs using the ‘Partial protection password’. For
each program that needs to be protected check the
Protect program
option and specify a range of steps on the
protection tab of the Program Properties dialog.
When setting or releasing the protection, it is possible to select the programs to affect in the Program Protection
dialog.
CS/CJ/CP-Series PLCs
CS/CJ/CP-series PLCs support a single eight-digit alphanumeric
System protection password
option for all
CS/CJ/CP-series PLCs. This provides read protection for the whole of program memory, accessed from the PLC
Properties dialog.
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