Siemens SIMATIC ET 200SP System Manual page 47

Removing a BaseUnit
To remove a BaseUnit, follow these steps:
The BaseUnit is wired and there are other BaseUnits to its right and left.
To remove a specific BaseUnit, move the neighboring modules. As soon as you have
created a clearance of about 8 mm from the neighboring BaseUnits, you can remove the
BaseUnit.
Note
The terminal box can be replaced without removing the BaseUnit. Refer to section Replacing
the terminal box on the BaseUnit (Page 209).
To remove a BaseUnit, follow these steps:
1. If present, turn off the supply voltage on the BaseUnit.
2. Loosen the wiring on the BaseUnit (with a 3 to 3.5 mm screwdriver).
3. Removing (from the right):
Press the mounting rail release button on the corresponding BaseUnit. Move the
BaseUnit parallel to the right and swivel the BaseUnit off of the mounting rail while
pressing the mounting rail release button.
Removing (from the left):
Press the mounting rail release button on the corresponding BaseUnit and on the
BaseUnit to the right of this. Move the BaseUnit parallel to the left and swivel it out of the
mounting rail while pressing the mounting rail release button.
Note: The mounting rail release button is located above the BaseUnit.
Figure 4-5
Distributed I/O system
System Manual, 12/2015, A5E03576849-AF
Removing the BaseUnit (removing from the right)
Installation
4.4 Installing BaseUnits
47