B&B Electronics VFG3000 - Manual - Manual (Page 187)

U SING THE S ECURITY S YSTEM S ECURITY S ETTINGS
R EVISION 1 P AGE 171
D
EFAULT
A
CCESS
To speed the configuration process, Fieldbus Gateway Manager also provides the ability to
specify default access and write logging parameters for mapped tags, internal tags and display
pages. The differentiation between mapped and unmapped tags is important in systems where
all changes to external data must be recorded, but where data internal to Fieldbus Gateway
Manager can be manipulated without the need for such an audit trail.
O N -D EMAND L OGON
Fieldbus Gateway Manager’s security system supports both conventional and on-demand
logon. A conventional logon can occur when a user interface element such as a pushbutton is
used to activate the Log On User action or to call the
UserLogOn() function. On-demand
logon occurs if the operator attempts an action without sufficient access rights, and if a failed
logon attempt has not occurred within the same action. For example, a user may press a
button that runs a program to reset a number of values. As soon as the program attempts to
change a value that requires security access, the system will prompt for logon credentials.
This method reduces operator interaction, and produces a more responsive system.
M AINTENANCE A CCESS
The system also provides a facility called Maintenance Mode to allow the user inactivity
timeout to be overridden during system commissioning. This mode is activated if a display
page is marked as being accessible with the Maintenance Access right, and if the current user
has gained access to the page as a result of that right. Use of this mode avoids the need to
logon repeatedly when testing the system.
S
ECURITY
S
ETTINGS
The security system settings are accessed via the Security Manager icon…
The available properties are as follows…
• The Inactivity Timeout property is used to indicate how much time must pass
without user input before the current user is automatically logged off. Too high a