2 Visual Components Manuals

3.2.2.3 Password Input Field − Reference
With this type of input field, a user level (password level) can be selected by entering a corresponding password.
Entered text is only evaluated internally − the application itself contains the numeric information about which
user level is currently set.
Up to three password−protected user levels are supported and are determined by the last corretly entered
password. Levels are defined numerically: 1 for the lowest authorization up to 3 for the highest.
Fewer password levels can optionally be used, but additional levels are not supported with this type of field.
Entering an incorrect password changes the password level to 0.
Passwords are defined in the editor during the design phase and cannot be changed during runtime. If changing
a password during runtime or more password levels are necessary, then an string input field can be used
instead.
General
Summary of the basic properties of these types of input fields.
Function Selects password level by entering a password.
Data Types
Availability
Special Features
Appearance
Individual Colors
Input
The following data types can be used for this field:
USINT process variable for outputting the current password level to the application
Entering a password takes place by inputting characters (alphanumeric).
This field can be used by all systems supported by Visual Components.
Depending on the number of panel keys, it may not be possible to input all characters
via the panel itself. However, this does not diminish the basic function of the input field.
Passwords must be chosen in such a way that they can even be input from the operator
panel. This is not checked by the Visual Components editor.
Special Functions:
• Up to 4 password levels, of which 3 are secured with passwords
• Simple configuration of passwords in the Visual Components editor
• Locking of input using the connected Status process variable
• Notification during or after entry takes place using the Status and Completion
Data Point process variables. This allows reactions to the input and
synchronized data acquisition from external stations.
Password are concealed when they are output so that they cannot be read. At the
outset, the password appears blank after each picture change since only the current
password level is stored, and not the last concluded input.
Special Functions:
• Visible/Invisible switching using the Status process variable
• Selectable foreground and background colors
• Display of incorrect/missing variables (field filled in with hyphens '−')
• Fully selectable fonts
The following can be individually set for each input field of this type:
• Foreground color (text color)
• Background color
All colors can either be set in the editor or during runtime using a process variable.
Optional, using one or more of the following methods:
Introduction to Visual Components 2.3
• Character input using panel keys
• Using the virtual keypad which is automatically displayed on panels with touch
screens
52 3.2.2.3 Password Input Field − Reference