Installing the S7-400
2-10 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
2.5 Mounting and Grounding the Racks

Important Notes on Installation

The S7-400 racks are designed for wall mounting, mounting on rails, and for
installation in frames and cabinets. Their mounting dimensions are compliant with
DIN 41 494.
According to the UL/CSA and the EU Directive 73/23/EEC (low-voltage directive),
installation in a cabinet, a casing, or a closed operations room is necessary in order
to fulfil the requirements for electrical safety (see Reference Manual, Chapter 1).

Step 1: Retaining Distances Between Devices

Youmust observe the minimum distances between the rack and neighboring
devices. Youneed these minimum clearances during installation and operation.
•For fitting and removing modules
•For fitting and disconnecting the module front connectors
•Toensure the air flow required for cooling the modules during operation
The following figure shows the minimum space you must provide for a rack.
20 mm 20 mm
40 mm
22 mm
352 mm
Mounting depth, fitted: max. 237mm
40 mm facilitates the mounting of a fan subassembly
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523 mm (18 slots)
298 mm (9 slots)
173 mm (4 slots)