CPU Specifications
and Operation
4–10
CPU Specifications and Operation
The DL05 PLCs allow you to use a password to help minimize the risk of
unauthorized program and/or data changes. Once you enter a password you can
“lock” the PLC against access. Once the CPU is locked you must enter the password
before you can use a programming device to change any system parameters.
You can select an 8-digit numeric password. The Micro PLCs are shipped from the
factory with a password of 00000000. All zeros removes the password protection. If
a password has been entered into the CPU you cannot just enter all zeros to remove
it. Once you enter the correct password, you can change the password to all zeros to
remove the password protection.
WARNING: Make sure you remember your password. If you forget your password
you will not be able to access the CPU. The Micro PLC must be returned to the
factory to have the password removed.
You can use the D2–HPP Handheld
Programmer or DirectSOFT
to enter a
password. The following diagram shows how
you can enter a password with the Handheld
Programmer.
D2–HPP
00000000
PASSWORD
DirectSOFT
XXXXXXXX
PASSWORD
CLR CLR AUX
8
I
1
B
ENT
X X ENTX
Select AUX 81
Enter the new 8-digit password
Press CLR to clear the display
There are three ways to lock the CPU once the password has been entered.
1. If the CPU power is disconnected, the CPU will be automatically locked
against access.
2. If you enter the password with DirectSOFT, the CPU will be automatically
locked against access when you exit DirectSOFT.
3. Use AUX 83 to lock the CPU.
When you use DirectSOFT, you will be prompted for a password if the CPU has
been locked. If you use the Handheld Programmer, you have to use AUX 82 to
unlock the CPU. Once you enter AUX 82, you will be prompted to enter the
password.
Using a Password
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