BECKHOFF CX2020 - Manual (Page 23)

Mounting and wiring
3.4 Mounting the module lock
Mounting the lock
The CX20x0 controller system is fully modular, i.e. all system interfaces of the system are field­configurable.
As a rule the latching of the modules to each other is sufficiently strong. However, it is possible for the
controller and its modules to be exposed to vibrations, shocks or impacts. The modules can be securely
connected to one another with the aid of bar clips.
The bar clips are inserted on the top side and underside
Underside Top side
If all system interfaces are locked, then the entire assembly can be snapped onto the support rail.
Dismounting the lock
In order to dismantle the assembly it must first be removed from the support rail. Afterwards the bar clips can
be removed with the aid of a screwdriver:
CX2020, CX2030, CX2040 23 Version 1.2