Siemens S7-300 CPUs suffix explanation
If you are in a new project and want to use Siemens S7-300 CPUs you are going to see a wide variety of CPUs under the name of CPU s7-300.
The first step is to open the SIMATIC manager software and choose a new project and go to Hardware configuration you will see the following table:
Where
1. XXX is the number of CPU.
The greater the number the more capability the CPU is. Like the CPU scan cycle, memory size and number of IOs can be connected in the PLC.
2. Y is defining the type of CPU and it can be:
3. Z is defining the communication ports in the CPU and it can be:
1 MPI port and 1 DP port for Profibus communication.
C. 2 PTP: this CPU has 2 ports, first port for MPI and a second port for PTP (Point To Point) port
The PTP port can be used to communicate with printers and barcode readers.
D. 2PN/DP: This CPU has 2 ports first port for MPI or DP and 1 or 2 ports for Profinet connection.
E. 3PN/DP: This CPU had 1 port for MPI, 1 port for Profibus, and 1 or 2 ports for Profinet.
Author: Karim Ali Anwar
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