Additional Configuration Features; Profibus-Dp/Mpi Network - Siemens SIMATIC S7-200 System Manual

Additional Configuration Features

The EM 277 PROFIBUS-DP module can be used as a communication interface to
other MPI masters, whether or not it is being used as a PROFIBUS-DP slave. The
module can provide a connection from the S7-300/400 to the S7-200 using the
XGET/XPUT functions of the S7-300/400. STEP 7-Micro/WIN and a network card
(such as the CP5611) using the MPI or PROFIBUS parameter set, an OP device
or the TD 200 (Rel. 2.0 or greater, order number 6ES7 272-0AA20-0YA0) can be
used to communicate with the S7-200 through the EM 277 PROFIBUS-DP
module.
A maximum of six connections (six devices) in addition to the DP master can be
connected to the EM 277 PROFIBUS-DP module. One connection is reserved for
a programming device (PG) and one is reserved for an operator panel (OP). The
other four connections can be used by any MPI master. In order for the EM 277
PROFIBUS-DP module to communicate with multiple masters, all masters must be
operating at the same baud rate. See Figure A-31 for one possible network
configuration.
When the EM 277 PROFIBUS-DP module is used for MPI communication, the MPI
master must use the station address of the module for all messages that are sent
to the S7-200 to which the module is connected. MPI messages sent to the EM
277 PROFIBUS-DP module are passed on to the S7-200.
The EM 277 PROFIBUS-DP module is a slave module and cannot be used for
communication between S7-200 PLCs using the NETR and NETW functions. The
EM 277 PROFIBUS-DP module cannot be used for Freeport communication,
which is a feature of the S7-200 communication ports.
Figure A-31 shows the PROFIBUS-DP MPI Network.
PROFIBUS-DP
Master
PROFIBUS-DP
Figure A-31

PROFIBUS-DP/MPI Network

S7-200 Programmable Controller System Manual
A5E00066097-02
S7-300
XPUTS/XGETS
STEP 7-Micro/WIN
Functions
MPI
PROFIBUS-DP
MPI
EM277
PROFIBUS-DP
Module
S7-22x CPU
S7-200 Specifications
1 1,2
TD 200
MPI
MPI
PROFIBUS-DP/MPI
1) Communication is possible only to
the S7-200 CPUs and the EM277.
2) TD 200 must be Rel 2.0 or greater.
Order number 6ES7 272-0AA20-0YA0.
A-61