User manual

Product Description
33002479 06 07/2008 25
Controls and Displays
Lens Cover The protective lens cover can be opened by sliding upwards.
With the lens cover open you have access to the following items:
z key switch
z battery
z reset button
Key Switch The key switch is a security feature and a memory protection switch. The key switch
has two positions: locked and unlocked. The key switch is only read and deciphered
by the PLC OS (executive) portion of the firmware and not by the OS loader portion.
The Quantum High End processor has a set of system menus that enable the
operator to:
z perform PLC operations (i.e., start PLC, stop PLC)
z display module parameters (i.e., communications parameters)
z switch to the maintenance mode (Safety processors)
The effect of the key position is shown below:
Reset Button When pressed, this button forces a cold start of the PLC.
Key
Position
PLC Operation
unlocked:
z System menu operations can be invoked and changeable module
parameters can be modified by the operator with the LCD and keypad.
z Memory protection is OFF.
z You can switch to Maintenance mode (Safety processors).
locked:
z No system menu operations can be invoked and module parameters are
read-only.
z Memory protection is ON.
z Safe mode forced (Safety processors).
Switching the key switch position from locked to unlocked or vice versa turns on the LCD's
backlight.