Siemens Simatic S7-300 CPU 31xC Series User Manual

Configuring
4.11 Planning subnets
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
4-49
PROFINET device with proxy functionality = Substitute
The PROFINET device with proxy functionality is the substitute for a PROFIBUS device on
Ethernet. The proxy functionality allows a PROFIBUS device to communicate not only with
its master but also with all nodes on PROFINET.
You can integrate existing PROFIBUS systems in PROFINET communication, for example
with the help of an IE/PB Link or a CPU 31x-2 PN/DP. The IE/PB Link then handles
communication over PROFINET as a substitute for the PROFIBUS components.
Currently, you can include DPV0 slaves in PROFINET in this way.
Further Information
For information on the differences and common features of PROFINET IO and PROFIBUS
DP and for information on migrating from PROFIBUS DP to PROFIBUS I/O, refer to the
From PROFIBUS DP to PROFINET IO programming manual.
4.11.3.4 PROFINET IO and PROFINET CBA
What is PROFINET IO?
Within the framework of PROFINET, PROFINET IO is a communication concept for the
implementation of modular, distributed applications.
PROFINET IO allows you to create automation solutions familiar from PROFIBUS.
PROFINET IO is implemented by the PROFINET standard for the programmable controllers
on the one hand, and on the other hand by the engineering tool STEP 7.
This means that you have the same application view in STEP 7 regardless of whether you
configure PROFINET devices or PROFIBUS devices. Programming your user program is
essentially the same for PROFINET IO and PROFIBUS DP if you use the expanded blocks
and system status lists for PROFINET IO.
Reference
For more detailed information on new and modified blocks, refer to the From PROFIBUS DP
to PROFINET IO
programming manual.
User Programs in PROFINET IO and PROFIBUS DP
A comparison of the most important differences and common features in PROFINET IO and
PROFIBUS DP that are relevant for the creation of user programs can be found in the
programming manual
From PROFIBUS DP to PROFINET IO.

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)