Siemens SIMATIC IPC547J Operating Instructions Manual page 126

Expanding and assigning parameters to the device
6.6 Installing and removing drives
6. Mount one or more drives on the rear of the drive bay plate. Note the holes:
Holes on the front of the drive bay plate and on the HDDs
2.5" SSDs:
Holes on the front of the drive bay plate and on the SSDs
126
3.5" HDDs:
Operating Instructions, 01/2021, A5E43920357-AA