Using Hmis And S7-Cpus With The Em Dp01 - Siemens SIMATIC S7 System Manual

8.5.1.11

Using HMIs and S7-CPUs with the EM DP01

The EM DP01 PROFIBUS DP module can be used as a communications interface to MPI
masters, whether or not it is being used as a PROFIBUS DP device. The EM DP01 can
provide a connection from an S7-300/400 to the S7-200 SMART using the X_GET/X_PUT
functions of the S7-300/400. HMI devices such as the SMART HMI or the TD 400 can be
used to communicate with the S7-200 SMART through the EM DP01.
Some devices allow you to select V memory as the memory area in the S7-200 SMART
CPU. If V memory is not an option, you should configure the client (CPU or HMI device) to
read and write to DB1 to access the V memory in the S7-200 SMART CPU. For example, a
X_GET would need the remote address set to P#DB1.DBX100.0 BYTE 20 to read 20 bytes
of V memory starting at VB100.
Note
An S7-1200 PROFIBUS DP master cannot access an S7-200 SMART CPU using GET/PUT
functions. The S7-1200 DP master can still access the S7-200 SMART CPU using
PROFIBUS Data Exchange Mode.
When the EM DP01 PROFIBUS DP module is used for MPI communications, the address
parameter of the XGET/XPUT functions must be set to the address of the EM DP01
(address switches). MPI messages sent to the EM DP01 are passed on to the
S7-200 SMART CPU.
Messages from MPI and HMI devices are (serviced during)/(subject to) the communication
background time in the S7-200 SMART CPU. The communication background time can be
increased to provide faster responses to the MPI and HMI requests.
A maximum of six connections (six devices) in addition to the DP master can be connected
to the EM DP01. In order for the EM DP01 to communicate with multiple masters, all masters
must be operating at the same baud rate. Refer to the figure below for one possible network
configuration:
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Communication
8.5 PROFIBUS
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