Siemens SIMATIC S7 System Manual page 54

Installation
3.3 Installation and removal procedures
Table 3- 1 Installing a CPU on a DIN rail
Task
Note
Using DIN rail stops could be helpful if your CPU is in an environment with high vibration
potential or if the CPU has been installed vertically. Use an end bracket (8WA1 808 or 8WA1
805) on the DIN rail to ensure that the modules remain connected.
If your system is in a high-vibration environment, then panel-mounting the CPU will provide a
greater level of vibration protection.
Table 3- 2 Removing a CPU from a DIN rail
Task
54
Procedure
Follow the steps below to install a CPU on a DIN rail.
1. Secure the rail to the mounting panel every 75 mm.
2. Snap open the DIN clip (located on the bottom of the module) and hook the back of
the module onto the DIN rail.
3. Rotate the module down to the DIN rail and snap the clip closed. Carefully check
that the clip has fastened the module securely onto the rail. To avoid damage to the
module, press on the tab of the mounting hole instead of pressing directly on the
front of the module.
Procedure
Follow the steps below to remove a CPU from a DIN rail.
1. Remove power from the CPU and any attached I/O modules.
2. Disconnect all the wiring and cabling that is attached to the CPU. The CPU and
most expansion modules have removable connectors to make this job easier.
3. Unscrew the mounting screws or snap open the DIN clip.
4. If you have expansion modules connected, slide the CPU to the left to disengage it
from the expansion module connector. Note: unscrewing or unsnapping the DIN
clips of the expansion modules can make it easier to disengage the CPU.
5. Remove the CPU.
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART