S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
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Rack
2
2.1 Function and design of the racks
Introduction
The racks for the S7-400 have the following functions:
● They physically hold the modules.
● They supply the modules with operating voltage.
● They connect the individual modules to each other via the signal busses.
Design of the racks
A rack consists of the following elements:
● Mounting rail with threaded bolts for fixing the modules and lateral cutouts for mounting
the rack
● Plastic parts that function, among other things, as guides when swinging the modules into
place
● A backplane bus, an I/O bus and, if necessary, a communication bus with bus connector
● Connection for local ground
The following figure shows the mechanical configuration of a rack (UR1).
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