Siemens Simatic S7-300 CPU 31xC Series - Mounting Modules Onto the Rail

Installing
5.3 Mounting modules onto the rail
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
5-7
5.3 Mounting modules onto the rail
Requirements for module installation
• The configuration of the automation system is completed.
• The mounting rail is installed.
Mounting order of the modules
Hang the modules onto the rail, starting at the left and in the following order:
1. Power supply module
2. CPU
3. SMs, FMs, CPs, IMs
Note
Please check before you insert any SM 331 analog input modules whether you have to
reposition the measuring range submodules at the side of the module. For further
information, refer to chapter 4, "Analog Modules" in your
Module Data Reference Manual.
Note
When installing an S7-300 system with ungrounded reference potential, make the
relevant settings on the CPU. You ideally do so before you mount any modules onto the
rail.