Siemens S7-300 Installation Manual page 84

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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. Add all modules in their specified
sequence to the rail  , slide them up to
the module on the left ), then swing
them down  .
3. Manually tighten the module screws.
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Once you have installed the modules, you can insert the key into the CPU mode
selector switch.
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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
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