How To Implement User Security - KEP MMI-1500 Installation & Operation Manual

7.9.6 How to Implement User Security

Use a data entry object that accesses LW9040. In the Numeric Tab select it to be displayed as "Mask" and as 9 digits above
the decimal point with the high limit as 999999999. Use an appropriate shape and for display. Be sure to provide a keypad in
the window for data entry and a way to activate the Trigger bit. See the Numeric Input Extend section for more details about
data entry objects.
Provide a way to force the level back to 0 when the secure operation is finished.
This is usually done by a Set Word part acting on LW9043
with Set style Set at window close and Set value of 0. No
Shape or Label needs to be assigned to the part (this makes
the part invisible). The part can be placed on any middle or
high security window. An example of such a Set Word Object
dialog is shown on the right.
7.9.7 Additional Security Through the PLC
Additional security can be provided by using PLC data to control Direct and Indirect windows. Program the PLC to prevent
these windows from being displayed unless a password compare is positive in the PLC.
These windows are put on the Common window for universal access or put only on special Base windows to further limit
their accessibility.
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