Configuring A Network - Siemens S7-400 Installation Manual

Networking
5.1

Configuring a Network

Subnets
You can connect an S7-400 device to various subnets:
• Via a Simatic Net CP Ethernet to an Industrial Ethernet subnet
• Via a Simatic Net CP PROFIBUS to a PROFIBUS-DP subnet
• Via the integrated multipoint interface to an MPI subnet
• Via the integrated PROFIBUS-DP interface to a PROFIBUS-DP subnet
With the M7-400, an MPI or PROFIBUS-DP network can be configured in the same
way. Only the modules required for connection to the PROFIBUS-DP network are
different (see Section 8.7.6).
Same Configuration
We recommend you use the same bus components as for a PROFIBUS-DP
network configuration when configuring an MPI network. The same configuration
rules apply.
Multipoint Interface (MPI)
This interface of the CPU uses a Simatic S7-specific protocol for data exchange
with programming devices (via STEP 7), operator panels, and other S7 CPUs. The
bus structure corresponds to that of the PROFIBUS.
Configuring Communication
In order that the individual nodes of an MPI or PROFIBUS-DP network can
communicate with each other, you must assign MPI or PROFIBUS-DP addresses
to them. The Manual Configuring Hardware and Communication Connections
STEP 7 V 5.2 describes how to assign these addresses and what you must take
into account.
All the CPU-related data you need to know to configure communication can be
found in the Reference Manual CPU Data, Chapter 4.
5-2
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04