
Communication Services
4-10
SIMATIC 505 PROFIBUS-FMS CP User Manual
FMS Services (continued)
When
you define an FMS connection, you must specify access rights to the
variables you have configured (which are listed in the Object Dictionary).
Access rights are determined in two ways: passwords and group numbers.
(Refer to Figure 4-5.)
Password
Access to a variable is only possible with the identical password
setting on the partner
.
• 0:
The FMS client must specify the password “0” for authorization
when the connection is established. Access is possible for
all
FMS
clients that specify the password.
• >0:
The FMS client must specify this password for authorization
during connection establishment.
Gr
oup Numbers
Access to a variable is only possible when at least one
group number is selected to match the setting on the partner. Selecting
group numbers is a further method for selectively restricting access rights.
Y
ou assign Groups 0 to 7 for each connection and for each variable.
Password
= 2
Station 1 Station 2
Job
on Station 1 can access
variable on Station 2.
(password match)
Job on Station 2 can access
variable on Station 1.
(password match)
Password
= 1
V
ariable PW = 1
V
ariable PW = 2
Password = 1
Station 1 Station 2
Job
on Station 1
cannot
access
variable on Station 2.
(password mismatch)
Job on Station 2
can
access
variable on Station 1.
(password match)
Password
= 1
V
ariable PW = 1
V
ariable PW = 2
Groups 1, 2
Station 1 Station 2
Job
on Station 1 can access
variable on Station 2.
(group number match)
Job on Station 2 can access
variable on Station 1.
(group number match)
Groups
3, 4
V
ariable Group 3
Var
. Groups 1, 5
Groups 2, 3
Station 1 Station 2
Job
on Station 1
cannot
access
variable on Station 2.
(group number mismatch)
Job on Station 2
can
access
variable on Station 1.
(group number match)
Groups
3, 4
V
ariable Group 3
Var
. Groups 1, 5
Password
Access
Group Number Access
Figure 4-5 Access
to V
ariables via Passwor
ds and Gr
oup Numbers
Specifying Access
Rights to V
ariables
in FMS Connections
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