Installing the S7-400
2-29
AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
2.12 Rules for the Arrangement of Modules

Arrangement of the Modules

Youonly need to observe two rules for rack mounting of the modules:
•In all racks, the power supply module must always be inserted on the extreme
left (beginning with slot 1). In the UR2-H from slot 1 in both segments.
•The receive IM in the ER must always be inserted on the extreme right. In the
UR2-H at slot 9 once per segment.
Note
Establish whether there are additional regulations applying to all modules not
described in this manual.
The following table shows which modules can be used in the differentracks:
Table2-2 Modules in the differentracks
Modules Racks Racks
UR1, UR2
UR2-H as
CR
UR1, UR2
as ER
UR2-H
as ER*
CR2,
CR3
ER1, ER2
Power Supply Modules D D D D D
CPUs D D
Send IMs D D
Receive IMs D D D
Signal Modules D D D D D
* NoIM 463-2, no adapter module, no power supply module along with the IM 461-1.

Space Requirement of the Racks

In the S7-400 system, there are modules occupying one, two, or three slots (width
25, 50, or 75 mm). Refer to the technical specifications of the module under the
keyword “dimensions” to see how many slots a module occupies.
The mounting depth of a rack fitted with modules is 237 mm maximum.