Components Of An S7-300 - Siemens SIMATIC S7-300 Hardware And Installation Manual

S7-300 modules
A programming device (PG) is used to program the S7-300 PLC. Use a PG cable
to connect the PG and the CPU.
Several S7-300 CPUs can communicate with one another and with other SIMATIC
S7 PLCs via the PROFIBUS cable. You can connect several S7-300s using a
PROFIBUS bus cable.
S7-300 modules
There is a whole range of components available for creating and using an S7-300.
The table below shows the major modules and their function.
Table 4-1

Components of an S7-300:

Components
rail
Accessory:
Shielding element
Power supply (PS)
4-2
Function
This is the rack for an S7-300
This converts the line voltage
(120/230 VAC) to 24 VDC
operating voltage and is used to
supply the S7-300 and 24 VDC
load circuits
S7-300 Programmable Controller Hardware and Installation
Illustration
A5E00105492-02