B&B Electronics VFG3000 - Manual - Manual (Page 185)

U SING THE S ECURITY S YSTEM S ECURITY B ASICS
R EVISION 1 P AGE 169
U
SING THE
S
ECURITY
S
YSTEM
Fieldbus Gateway Manager contains powerful features to allow you to define which operators
have access to which display pages, and limit those operators who are able to make changes
to sensitive data. The software also contains a security logging facility that can be used to
record changes to data values indicating when the change occurred, and by whom it was
performed.
S
ECURITY
B
ASICS
The follow sections details some of the basic concepts used by the security system.
O BJECT -B ASED S ECURITY
Fieldbus Gateway Manager’s security system is object-based. This means that security
characteristics are applied to a display page or to a tag, and not to the user interface element
that accesses the page or makes a change to the tag. The alternative subject-based approach
typically means that you have to be careful to apply security settings to every single user
interface element that might change restricted data. Fieldbus Gateway Manager’s approach
avoids this duplication and ensures that once you have decided to protect a tag, it will remain
protected throughout your database.
N
AMED
U
SERS
Fieldbus Gateway Manager supports the ability to create any number of users, each of whom
will have a username, a real name and a password. The username is a case-insensitive string
with no embedded spaces that is used to identify the user when logging on, while the real
name is typically a longer string that is used within logon files to record the human-readable
identity of the user making a change. Note that you are free to use these fields in other ways if
it suits your application: You may, for example, create users that represent groups of
individuals or perhaps roles, such as Operators, Supervisors and Managers. You may also
decide to use the real name to hold an item such as a clock number to tie user identities into
your MRP system.