Siemens Simatic CFU, Commissioning Manual, Page: 49 / 220

Required accessories
You can use the following screw types for fastening of the mounting rails:
Table 6-1 Required accessories
For ... you can use ... Explanation
outer fixing screws Cylinder head screw M6
to ISO 1207/ISO 1580 (DIN 84/
DIN 85)
Choose a suitable screw length for your
assembly.
You also need washers for cylinder head
screws with an internal diameter of
6.4 mm and an external diameter of
11 mm in accordance with ISO 7092
(DIN 433).
Additional fixing
screws (for mounting
rails > 483 mm)
Hexagon bolt M6
to ISO 4017 (DIN 4017)
Additional fixing screws (for mounting rails > 530 mm)
In the case of mounting rails > 530 mm, we recommend using fixing screws at distances of
≤ 500 mm.
Preparing mounting rails for installation (for mounting rails > 530 mm)
To prepare the 2000 mm mounting rail for the CFU, follow these steps:
1. Cut the 2000 mm mounting rail to the required length.
2. Mark the holes. The necessary dimensions can be found in the table "Dimensions for the
drill holes":
– Two holes at the beginning and end of the mounting rail (distance 15 mm).
– Additional drill holes at equal intervals of 500 mm maximum
3. Drill the marked holes according to the selected type of fastening.
4. Ensure that there are no burrs or shavings on the mounting rail.
Note
For the CFU to be mounted correctly, you must observe the following:
● Ensure that the drill holes are positioned centered on the mounting rail (17.5 mm -
corresponds to the center of a mounting rail: partially with an identification groove),
● and that only screws up to the maximum size are used.
Installation
6.2 Installing the mounting rail
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD
49