Lift the interface unit from the DIN rail.
PP307
Page 35
.User Guide
8. Lever the sliding spring catch downwards that disengages from the DIN rail. Removing SN-W/E Interface Unit from Standard DIN Rail Insert flatblade screwdriver into the sliding spring catch, via the slot the underside the unit (see Fig.2
Removal fro DIN Rail
307029
Fig. 29)