Siemens S7-400PLC Spécifications Page 37

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S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
37
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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