Communication
4.1 interfaces
S7-400 Automation System, CPU Specifications
4-2 Manual, 10/2006, 6ES7498-8AA04-8BA0
MPI Interface as a PROFIBUS DP Interface
You can also configure the MPI interface for operation as a PROFIBUS DP interface. To do
so, you can reconfigure the MPI interface under STEP 7 in HW Config. You can use this to
set up a DP line consisting of up to 32 slaves.
Devices capable of MPI communication
● PG/PC
● OP/TP
● S7-300 / S7-400 with MPI interface
● S7-200 only with 19.2 Kbps and 187.5 Kbps
4.1.2 PROFIBUS DP
Availability
CPUs with a "PN" name suffix are equipped with a PROFINET DP interface as a plug-in
module. To be able to use this interface, you must first configure it HW Config and then load
the configuration in the CPU.
A CPU with MPI/DP interface is supplied with a default MPI configuration. You need to set
DP mode in STEP 7 if you want to use the DP interface.
Properties
The PROFIBUS DP interface is mainly used to connect distributed I/O. You can configure
the PROFIBUS DP interface as master or slave. It allows a transmission rate of up to
12 Mbps.
The CPU broadcasts its bus parameters, such as the transmission rate, via the PROFIBUS
DP interface when master mode is set. A programming device, for example, can thus receive
the correct parameters and automatically connect to a PROFIBUS subnet.
Note
For DP interface in slave mode only
When you disable the Commissioning / Debug mode / Routing check box in the DP interface
properties dialog in STEP 7, all user-specific transmission rate settings will be ignored, and
the transmission rate of the master is automatically set instead. This disables the routing
function at this interface.
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