Bus Settings; Mpi - Softing NETLink S7-Compact User Manual

NETLink S7-Compact - User Guide
5.1.2

Bus settings

The NETLink S7-Compact Gateway can be operated on three different bus systems: MPI, PPI, and
PROFIBUS.
From the NETLink S7-Compact Gateway user's viewpoint, the three bus systems only differentiates
by the transmission rates that can be selected and the additional options which are explained here.
The bus configuration is passed to the NETLink S7-Compact during the runtime of the NETLink S7-
Compact driver and is not stored in the device.
It is possible to use NETLink S7-Compact without providing bus-related information. In this case,
NETLink S7-Compact will independently attempt to receive the transmission rates and the bus
parameters from a master CPU, and can then be operated without resetting the NETLink S7-Compact
driver in various automation systems, possibly with different transmission speeds.
This auto-baud function is only supported when the Cyclical distribution of the bus parameters is
activated in the involved automation system. This function is not available in S7-200 systems in
general.
5.1.2.1

MPI

The MPI configuration contains station and network-related settings.
The most important setting concerning bus configuration is assignment of the station address. This
refers to the address the NETLink S7-Compact will have on the bus when it goes online.
The station address can have any value from '0' and '126' if the selected address is lower than or
equal to the highest station address (HSA).
Example: HSA = 31
Any value between '0' and '31' can be specified for the station address if this address does not yet
exist on the bus.
The local timeout of the NETLink S7-Compact driver can be parameterized in the station-related
settings. If the driver does not receive a response to a request within the set timeout, a
communication error is signaled to the Simatic application.
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