Siemens SIMATIC ET 200SP System Manual page 73

Installation
5.4 Installing the CM DP communication module
Removing a CM DP
The CPU and the CM DP are wired and BaseUnits are located to its right.
To remove the CM DP communication module, follow these steps:
1. Switch off the supply voltage on the CPU.
2. Press the mounting rail release button on the first BaseUnit and, at the same time, move
the CPU and the CM DP parallel to the left until they detach from the rest of the module
group (clearance about 16 mm).
3. Press the mounting rail release button on the CM DP and move it to the right until it
detaches from the CPU (clearance about 8 mm).
4. While pressing the mounting rail release button on the CM DP, swivel the CM DP off of
the mounting rail.
Note
It is not necessary to remove the bus connector from the CM DP unless you have to replace
the CM DP.
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Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ