Configuring The Mpi Bus; Operating Interface X21 As An Mpi; Mpi Parameters - Siemens SIMOTION D410-2DP/PN Installation Manual

6.4

Configuring the MPI bus

6.4.1

Operating interface X21 as an MPI

The X21 interface can also be operated as an MPI interface.
The typical (default) baud rate is 187.5 Kbaud. A baud rate of up to 12 MBaud can be set for
communication with other CPUs. It should be noted, however, that a rate of 12 MBaud is not
supported by all CPUs (e.g. smaller SIMATIC S7 CPUs).
The following list provides examples of when using MPI (Multi Point Interface) may prove
effective:
● If a PC/PG is being used with an MPI interface
● If an OP/TP only has an MPI interface (newer devices have PROFIBUS or PROFINET
interfaces)
● If SIMOTION and SIMATIC CPUs are coupled via XSEND/XRECEIVE
Note
When the X21 interface is used as an MPI bus, additional activation of a drive on this interface
is not possible.
Additional references
For general information on MPI, see the
6.4.2

MPI parameters

MPI bus addresses and data transmission rate
Every node on the MPI bus must have a bus address in the range 0 to 31.
The data transmission rate on the MPI bus can be set to any value for the SIMOTION D410‑2.
Communication attempt unsuccessful
If communication cannot be established at all, or if it cannot be established with individual
nodes on the MPI bus, check the following:
● Is the transmission rate setting for the SIMOTION D410‑2 used for all nodes?
● Are there any loose plug connections?
● Are all bus segments terminated properly?
Bus segments that are not terminated properly will disrupt communication on the MPI bus.
SIMOTION D410-2
Commissioning and Hardware Installation Manual, 01/2015
Parameter assignment / addressing
SIMOTION Communication System Manual.
6.4 Configuring the MPI bus
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