Siemens SIMATIC ET 200AL System Manual page 23

Mounting
4.2 Mounting modules
Mounting 45 mm I/O modules (front mounting)
Watch video sequence (https://support.industry.siemens.com/cs/ww/en/view/95886672)
The 45 mm wide I/O modules have a fastening point at the top and bottom.
Follow the steps below to mount a 45 mm wide I/O module:
1. Drill two fastening holes with 4.5 mm diameter spaced 149.6 mm apart.
2. Fasten the I/O module with the screws to both fastening points (tightening torque 1.2 Nm).
The figure below shows the dimensions for fastening using the example of the IO-Link I/O
module DI 8x24VDC M12-L 8xM12.
Figure 4-3
22
Dimensions for mounting 45 mm I/O modules
IO-Link I/O modules
System Manual, 10/2020, A5E48755395-AA