Siemens SIMATIC NET SCALANCE XC-300 Operating Instructions Manual page 47

Figure 5-4
Securing bar in the wall mounting position (as supplied).
To install the device on an S7-300 standard rail, follow the steps below:
1. Place the second housing guide of the device on the top edge of the standard rail.
2. Swing the device down towards the back against the mounting rail.
3. Loosen the knurled screw with your hand or a screwdriver. The spring mounted securing bar
locks in place.
4. When you tighten the knurled screw. you cannot release the securing bar (torque 0.5 Nm).
The device is additionally fixed.
5. Connect the electrical connecting cables, refer to the section "Connecting up (Page 53)".
Removal
To remove the device from a standard rail, follow the steps below:
1. Disconnect all connected cables.
2. If necessary, loosen the knurled screw with your hand or a screwdriver.
3. Lever the securing bar down using a screwdriver as far as it will go.
4. Remove the device from the mounting rail with the bar pulled.
SCALANCE XC-300
Operating Instructions, 10/2022, C79000-G8976-C584-01
S7-300 mounting rail installation with the securing bar in the wall mounting position.
Installing and removing
5.4 Installation on a standard S7-300 rail
47