Siemens SIMATIC S7-1500 System Manual page 38

Installation
4.1 Basics
Minimum clearances
Modules can be mounted up to the outer edge of the mounting rail. Maintain the following
minimum clearances at the top and bottom when installing or removing the S7-1500
automation system/ET 200MP distributed I/O system.
①
Figure 4-1
Installation rules
● The installation starts on the left with a CPU/interface module or a system power supply.
● The modules are connected to each other with U connectors.
● Note that no U connector protrudes from the first and last module.
Note
Only remove and insert modules when the power to the system is switched off.
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Upper edge of the mounting rail
Minimum clearances in the control cabinet
Automation system
System Manual, 12/2014, A5E03461182-AC