NETLink
®
Ethernet Products
7.6 Observing variables
In addition to the “Observing Variables” function in the Simatic
engineering tools, all NETLink
®
Gateways also provides this
function via the web interface. The operating menu can be
accessed via the ‘Observe Variables’ link. A RFC 1006
communication channel is assigned for these functions.
You can use the drop-down menu to select an active MPI/PB ad-
dress, while the number of variables you want to monitor can be
set within a range of 1 to 10 according to your own preferences.
The page only supports decimal, hexadecimal, and binary display
formats, making the output values easy to read and use for diag-
nostic purposes. The page supports monitoring for the following
units (for the address range):
AB, AW, AD, EB, EW, ED, MB, MW, MD, DBB, DBW, DBD, coun-
ter, and timer.
To display the desired values, you use the ‘1x fetch’ button for a
single value update or ‘cyclic fetch’ for a permanent online query.
The value update is currently permanently set to 0.5 seconds.
Even if multiple stations access this function from the TCP/IP
end, only one connection resource is ever assigned in a NETLink
®
.
Moreover, data exchange via MPI/PB and/or RFC 1006, the
‘Observe Variables’ action has the lowest priority. The update time
in the Web interface therefore depends on the concurrent bus
load.
Once you have configured all the settings you want on the page,
click on the “Save Configuration” button (with all the variables and
free-text descriptions—consisting of a maximum of 32 charac-
ters— you created) to save them on the NETLink
®
unit.
7.7 NETLink
®
WLAN configuration
This section provides only the functions of a NETLink
®
WLAN
adapter. The commissioning of the available wireless modes is
described step by step.
7.7.1 NETLink
®
WLAN in the infrastructure mode (AP)
When using the infrastructure mode the communication of two
WLAN components is handled by a mediation unit, an access
point (AP). The AP functions as central coordination point of the
Every submenu features
a Help button that can
be used to access descri
p-
tions of relevant details
and functions.
a-
tures a Help button
that can be used to
access d
escriptions of
relevant details and
functions
.
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