Siemens S7-400 Installation Manual page 218

Assembling the M7-400
8.4.7 Installing a Module Assembly in the Rack
Introduction
The installation of an M7-400 CPU together with modules from the S7-400 series in
a rack is carried out as described in Chapter 5. If the M7-400 central rack has
expansion racks, this must be preassembled with its expansion racks into a module
group (see also Section 8.4.6 "Assembling Expansion Modules on a Central
Rack"). The installation of such a module group in the rack is the subject of this
section.
Tool
The tool needed to install the module assembly is a cylindrical screwdriver with
3.5 mm blade width.
Installation Sequence
To install modules in a rack, follow the steps outlined below:
1. Remove the dummy plates from the slots of the rack at which you wish to insert
the module assembly. Grasp the dummy plate at the points marked and pull it
forward and off.
2. Disconnect the power supply module from the supply.
3. Attach the module assembly and swing it downward (see Figure 8-12).
4. Screw on the modules of the module assembly top and bottom with a torque of
0.8 to 1.1 Nm (see Figure 8-13).
5. Fit the remaining modules.
6. Insert the key of the CPU mode switch when you have fitted all modules (see
Figure 8-14).
7. Refit the module covers after wiring.
Described in the following section are the most important stages in installing a
module assembly.
Removal of the modules is described in Section 8.8 from page 8-46 onward.
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S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04