Siemens Simatic S7-400

Installing the S7-400
2-16
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
2.6 Methods of Ventilation
Methods of Ventilation
Under extreme ambient conditions, particularly when operating the S7-400
modules in cabinets, you can use the cable duct or fan subassembly to optimize
ventilation.
There are two methods of supplying air to the modules. You draw in air either from
the back or from below. The cable duct and fan subassembly can be converted for
this purpose.
The following figure shows the ventilation when air is drawn in from the back.
Exhaust air
Cable duct or fan
subassembly
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Exhaust air
Modules
Wall
Modules
Supply air
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