48 NETLink
®
Ethernet Products
9 Bus Parameters in Single Master Operation
If the NETLink
®
Gateway is connected to a bus system on which
no other master is active, the NETLink
®
generates the token itself.
This feature can be enabled on the web interface under “Basic
Configuration.” In most cases, it will also be necessary to config-
ure the corresponding bus parameters accordingly.
The “NETLink Bus Address” field must be used to assign the NET-
Link
®
device its own station address, i.e., the station address that
it will use to communicate on the bus (the address is set to 0 by
default).
The value for this address may be anywhere in the range 0
through 126. It is a precondition for this that the selected address
is not larger than the HAS (highest station address) and is not al-
ready being used for another device on the bus.
9.1 Storing specified bus parameters
For bus profiles MPI and PPI, no other adaptations besides the
baud rate are usually necessary. However, the DP setting must be
configured carefully.
When parameterizing, please note that all parameters for
PROFIBUS are interdependent. That is, if a parameter, e.g. the
baud rate, is changed, all the other parameters usually also
change.
For MPI, on the other hand, all parameters besides the baud rate
are fixed. That is, if an MPI connection of increased from, say,
from 187.5 Kbps to 12000 Kbps, all other parameters can/must
remain unchanged.
The following parameters must be taken into account:
• Baud rate: The required baud rate is entered in
Kbps. For example ‘187.5’
or ‘12000’.
The possible values are:
9.6; 19.2; 45.45; 93.75; 187.5; 500;
1500; 3000; 6000, and 12,000.
• HSA The highest station address is entered
here. For MPI generally ‘31’
and for PROFIBUS ‘126.’ However, any values
can be used that are not equal
to the default values.
• TSlot_Init This value is always ‘415’ for MPI –
whatever the baud rate. For PROFIBUS
the appropriate value should be read
from the PROFIBUS project.
• Ttr This value is always ‘9984’ for MPI –
whatever the baud rate. For PROFIBUS
the appropriate value should be read
from the PROFIBUS project.
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