Siemens SIMATIC S7-400 Hardware And Installation Manual page 39

Delivered state:
Cover fitted at bottom
(supply air from the rear)
Cover fitted at back
(supply air from below)
State When Shipped
The cover is fitted in the base of the cable duct or fan subassembly. Air is supplied
from the back.
Filter Mat (optional)
To filter the air supply, you can fit a filter mat for the cable duct and fan
subassembly. The filter mat is optional and is not part of the cable duct or fan
subassembly.
Like the cover, the filter mat can be inserted flat in the base or at its rear edge in
the corresponding snap hinges or quick-release locks.
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
Base
Snap catches
Cover
Base
Snap hinges
Installing the S7-400
Cover
Quick-release locks
2-19