Siemens SIMATIC S7-300 Hardware And Installation Manual page 86

Installation
Installation steps
The steps for installing the modules are described below.
1. Plug the bus connectors into the CPU and
signal/function/communication/interface
modules.
One bus connector is included per
module, but not for the CPU.
•
Always start at the CPU when you plug
in the bus connectors. Here, take the
bus connector of the "last" module in
the row.
•
Insert the bus connectors into the
other modules.
The "last" module is not equipped with
a bus connector.
2. Suspend all modules in their specified
sequence onto the rail (1), slide them up
to the module on the left (2), then swing
them down (3).
3. Screw-fasten all modules, tightening the
screws with a torque of 0.8 N/m to
1.1 N/m.
Insert the key (CPUs with key switch only)
Once you have installed the modules, you can insert the key into the S7-300 CPU's
mode selector switch.
6-8
CPU
S7-300 Programmable Controller Hardware and Installation
2
1
3
0,8 - 1,1 Nm
A5E00105492-02