Installing the S7-400
2-34 AutomationSystem S7-400 Hardwareand Installation
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2.15 Methods of Expansion and Networking
Introduction
Apart from the structures mentioned in this chapter,other expansions are possible,
for example, by connecting distributed I/Os or by networking.

Distributed I/Os

When an S7-400 is configured with a distributed I/O system, the inputs/outputs
operate in a distributed local arrangement and are directly connected via
PROFIBUS DP to a CPU.
One of the master-capable CPUs of the S7-400 is used.
Youcan use the following devices, for example, as slaves, i.e. as local
inputs/outputs:
ET 200M
ET 200S
ET 200X
ET 200eco
All DP standard slaves

Networking

Youmay connect your S7-400 to various subnets:
via Simatic Net CP Ethernet to an Industrial Ethernet subnet
via Simatic Net CP Profibus to a Profibus DP subnet
via the integrated MPI interface to an MPI subnet
via the integrated Profibus DP interface to a PROFIBUS DP subnet
See Chapter 5 for further details.