Function And Structure Of The Racks; Structure Of A Rack With 18 Slots - Siemens Simatic M7-400 Reference Manual

Racks
2.1

Function and Structure of the Racks

Introduction
The racks in the S7-400 have the following tasks:
• They hold the modules
• They supply the modules with operating voltage
• They connect the individual modules to each other via the signal buses
Structure 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
Figure 2-1 shows the mechanical configuration of a rack (UR1).
Aluminum carrier
Figure 2-1
UL/CSA Note
Special requirements should be taken into consideration in the area of influence of
the UL/CSA; these may be fulfilled by installing the system in a cabinet.
2-2
Connection for local ground

Structure of a Rack with 18 Slots

S7-400, M7-400 Programmable Controllers Module Specifications
Plastic parts
Bus connector (covered when shipped)
A5E00069467-07