Installation
4.3 Installation and removal procedures
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
61
Installing and removing the CPU
You can install the CPU on a panel or on a DIN rail.
Note
Attach any communication modules to the CPU and install the assembly as a unit. Install
signal
modules separately after the CPU has been installed.
Consider the following when installing the units on the DIN rail or on a panel:
● For DIN rail mounting, make sure the upper DIN rail clip is in the latched (inner) position
and that the lower DIN rail clip is in the extended position for the CPU and attached CMs.
● After installing the devices on the DIN rail, move the lower DIN rail clips to the latched
position to lock the devices on the DIN rail.
● For panel mounting, make sure the DIN rail clips are pushed to the extended position.
To install the CPU on a panel, follow these steps:
1. Locate, drill, and tap the mounting holes (M4), using the dimensions shown in table,
Mounting dimensions (mm) (Page 57).
2. Ensure that the CPU and all S7-1200 equipment are disconnected from electrical power.
3. Extend the mounting clips from the module. Make sure the DIN rail clips on the top and
bottom of the CPU are in the extended position.
4. Secure the module to the panel, using a Pan Head M4 screw with spring and flat washer.
Do not use a flat head screw.
Note
The type of screw will be determined by the material upon which it is mounted. You
should apply appropriate t
orque until the spring washer becomes flat. Avoid applying
excessive torque to the mounting screws. Do not use a flat head screw.
Note
Using DIN rail stops could be helpful if your CPU is in an environment with high vibration
potential or if the CPU h
as been installed vertically. Use an end bracket (8WA1808 or
8WA1805) 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
ection.
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