Siemens CIM Operating Manual page 33

Press the marked recesses on both left and right sides of the module with a flat-blade
screwdriver to loosen and then remove the middle housing.
Open the top housing
Pull the top housing in the marked direction to open the cover.
CIM
Operating Manual, 11/2022, A5E51250518-AC
Mounting and connecting the device
4.3 Installing expansion modules
33