DL06 Micro PLC User Manual, 3rd Edition, Rev. E
3-11
Chapter 3: CPU Specifications and Operation
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Using a Password
The DL06 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 (along
with the ladder project) removed. It is the policy of Automationdirect to require the memory of the
PLC to be cleared along with the password.
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
Direct
SOFT, the CPU will be automatically locked against access
when you exit
Direct
SOFT.
3. Use AUX 83 to lock the CPU.
When you use
Direct
SOFT, 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.
NOTE: The DL06 CPUs support multi-level password protection of the ladder program. This allows
password protection while not locking the communication port to an operator interface. The multi-level
password can be invoked by creating a password with an upper case A followed by seven numeric
characters (e.g. A1234567).
D2–HPP
DirectSOFT
PASSWORD
00000000
PASSWORD
XXXXXXXX
CLR
CLR
AUX
8
I
1
B
ENT
X
X
ENT
X
Select AUX 81
Enter the new 8-digit password
Press CLR to clear the display
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.
