AutomationDirect DL105, User Manual

Page: 307 / 350

Appendix
A
Auxiliary
Functions
Auxiliary Functions
A--8
DL105 PLC User Manual, 3rd Edition
AUX 8* — Password Operations
There are several AUX functions available that you can use to modify or enable the
CPU password. You can use these features during on-line communications with the
CPU, or, you can also use them with an EEPROM installed in the Handheld
Programmer during off-line operation. This will allow you to develop a program in the
Handheld Programmer and include password protection.
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AUX 81 — Modify Password
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AUX 82 — Unlock CPU
S
AUX 83 — Lock CPU
You can use AUX 81 to provide an extra measure of protection by entering a
password that prevents unauthorized machine operations. The password must be
an eight-character numeric (0--9) code. Once you’ve entered a password, you can
remove it by entering all zeros (00000000). (This is the default from the factory.)
Once you’ve entered a password, you can lock the CPU against access. There are
two ways to lock the CPU with the Handheld Programmer.
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The CPU is always locked after a power cycle (if a password is present).
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You can use AUX 82 and AUX 83 to lock and unlock the CPU.
You can also enter or modify a password from within Direct SOFT by using the
PLC/Password sub-menu. This feature works slightly differently in Direct SOFT.
Once you’ve entered a password, the CPU is automatically locked when you exit the
software package. It will also be locked if the CPU is power cycled.
WARNING: Make sure you remember the password before you lock the CPU.
Once the CPU is locked you cannot view, change, or erase the password. If
you do not remember the password, you have to return the CPU to the factory
for password removal.
NOTE: The DL105 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).
AUX 82 can be used to unlock a CPU that has been password protected.
Direct SOFT will automatically ask you to enter the password if you attempt to
communicate with a CPU that contains a password.
AUX 83 can be used to lock a CPU that contains a password. Once the CPU is
locked, you will have to enter a password to gain access. Remember, this is not
necessary with Direct SOFT since the CPU is automatically locked whenever you
exit the software package.
AUX 81
Modify Password
AUX 82
Unlock CPU
AUX 83
Lock CPU