Guide to the S7-300 documentation   
   
  CPU 31xC and CPU 31x, Technical Data 
1-2  Manual, 01/2006 Edition, A5E00105475-06 
Table 1-3  Communication between sensors/actuators and the PLC 
Information on..  is available in ... 
Which module is suitable for my sensor/actuator?  For CPU: CPU 31xC and CPU 31x Manual, Technical Data  
For signal modules: Reference manual of your signal 
module 
How many sensors/actuators can I connect to the module?  For CPU: CPU 31xC and CPU 31x Manual, technical data 
of signal modules: Reference manual of your signal module 
To connect my sensors/actuators to the PLC, how do I wire 
the front connector ? 
S7-300, CPU 31xC and CPU 31x operating instructions: 
Installation: Wiring – Wiring the front connector 
When do I need expansion modules (EM) and how do I 
connect them? 
S7-300, CPU 31xC and CPU 31x operating instructions: 
Hardware and Installation: Configuring – Distribution of 
modules to several racks 
How to mount modules on racks / mounting rails  S7-300, CPU 31xC and CPU 31x operating instructions: 
Installation: Assembly – Installing modules on the mounting 
rail 
 
Table 1-4  The use of local and distributed I/O 
Information on..  is available in ... 
Which range of modules do I want to use?  For local I/O and expansion devices: Module Data reference 
manual 
For distributed I/O and PROFIBUS DP: Manual of the 
relevant I/O device 
 
Table 1-5  Configuration consisting of the Central Unit (CU) and Expansion Modules (EMs) 
Information on..  is available in ... 
Which rack / mounting rail is most suitable for my 
application? 
S7-300, CPU 31xC and CPU 31x operating instructions: 
Hardware and Installation: Configuration 
Which interface modules (IM) do I need to connect the EMs 
to the CU? 
S7-300, CPU 31xC and CPU 31x operating instructions: 
Hardware and Installation: Configuring – Distribution of 
modules to several racks 
What is the right power supply (PS) for my application?  S7-300, CPU 31xC and CPU 31x operating instructions: 
Hardware and Installation: Configuration