Siemens Simatic S7-400 - The Structural Design of the S7-400 - Simple and Modular; Module Rack in the S7-400 System with Components

Configuration Variants of the S7-400
6-2
Automation System S7-400 Configuration and Use
A5E0044271 1-02
6.1 The Structural Design of the S7-400 - Simple and
Modular
Introduction
The modular structural design of the SIMATIC S7-400 makes it flexible,
user-friendly and capable of expanding to meet the requirements of your
automation task.
Structural Design
All modules of the S7-400 are simply plugged into and bolted to a module rack.
PS CPU SMs
Figure 6-1 Module rack in the S7-400 system with components
Simple Exchange of Modules
You only have to loosen two fastening screws to change a module.
Uniform Mounting Depth
All connections and plugs are recessed in the modules and protected by hinged
covers. The mounting depth is a uniform 230 mm.