Assembling the M7-400
8-2
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
8.1 Mechanical Configuration
Introduction
Explained in this section are the rules you must observe for arranging modules in
the M7-400 automation computer.
All other information which is important for the mechanical configuration applies
both to the S7-400 and the M7-400, and is described in Chapter 2.
Rules for the Arrangement of Modules
You must observe the following rules for the arrangement of modules in a rack:
• The power supply module must be inserted in slot 1 in all racks.
• The receive IM in the expansion rack must always be inserted on the extreme
right.
• A module assembly comprising CPU and expansion units must be configured in
a particular sequence. Shown in Table 8-1 are the possible configurations of a
module assembly with a specified sequence for the expansion units.
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