Installing 
  5.2 Installing the mounting rail 
S7-300, CPU 31xC and CPU 31x: Installation 
Operating Instructions, Edition 08/2004, A5E00105492-05 
5-3 
Tools required and material 
To install the S7-300, you require the tools and materials listed in the table below. 
Table 5-2  Installation tools and materials 
You require ...  for ... 
cutting the 2 m rail to length  commonly available tool 
scribing and drilling holes on the 2 m rail  commonly available tool, 6.5 mm diameter drill bit 
screw-mounting the rail  wrench or screwdriver, matching the selected 
fixing screws 
diverse M6 screws (length depends on the place 
of installation) with nuts and spring lock washers 
screw-fastening the modules on the rail  screwdriver with 3.5 mm blade width (cylindrical 
design) 
pulling out the grounding slide contact to achieve 
ungrounded state 
screwdriver with 3.5 mm blade width (cylindrical 
design) 
 
5.2  Installing the mounting rail 
Mounting rail versions available 
•  Ready-to-use, four standard lengths (with 4 holes for fixing screws and 1 ground 
conductor bolt) 
•  One meter mounting rail 
May be shortened to any special length. Supplied without holes for fixing screws and 
without ground conductor bolt. 
Requirements 
Prepare the 2 m mounting rail for installation.