Siemens SIMATIC S7-1500 Manual page 14

3. Hook the interface module on the rail.
You may only plug in one interface module. The interface module must be plugged into
the first slot.
4. Swivel the interface module downwards so that the contacts are connected to the active
backplane bus.
5. Align the active backplane bus with the interface module.
6. Tighten the screws for the interface module (tightening torque 1.5 Nm).
Figure 3-2
7. Install the I/O module on the mounting rail. Align a 25 mm or 35 mm wide I/O module with
the arrows. A 70 mm wide I/O module covers 2 slots.
8. Swing the I/O module downwards so that the contacts are connected to the active
backplane bus.
9. Tighten the screw for the I/O module (tightening torque 1.5 Nm).
10. Repeat the process for all I/O modules that you want to mount.
Figure 3-3
Active backplane bus ST 1+12 slot, active backplane bus ST 1+8 slot, active backplane bus ST 1+4 slot
Equipment Manual, 07/2020, A5E46240468-AB
Mounting the interface module on the active backplane bus
Mounting the I/O module on the active backplane bus
Mounting
13