Pilz PSSu H PLC1 FS SN SD - Manual (Page 17)

Installation
Operating Manual PSSu H PLC1 FS SN SD(­T)(­R)
21939­EN­10 17
} Make sure that the locking mechanisms [3] are pushed downwards, connecting the
module firmly to the mounting rail.
Schematic representation:
[1]
[2] [3]
[3]