Siemens SCALANCE X-400 Operating Instructions Manual page 98

Installation
4.4 Installing / uninstalling the extender modules for SCALANCE X414-3E
7. Using a slotted screwdriver with a 2.8 mm wide blade, tighten the two captive slug screws
on slot 11. The screws lock the two guide bolts, so do not use excessive force when
tightening them.
8. Fit a suitable cover on slot 11 of the basic device.
Note
The basic device must not be used permanently without the right side panel.
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Operating Instructions, 06/2015, C79000-G8976-C186-12
SCALANCE X-400