Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual page 77

The following list illustrates which PROFINET devices can only adopt the function of a
PROFINET IO controller:
• PCs attached to PROFINET with a CP (for example CP 1616) and SOFTNET PROFINET
• SIMOTION device for particularly strict real-time requirements.
PROFINET devices can only adopt the function of a PROFINET CBA controller, for example
PCs with a standard Ethernet interface and the WinLC software.
Proxy in PROFINET IO and PROFINET CBA
Proxies for PROFINET IO and proxies for PROFINET CBA are different.
In PROFINET IO, the proxy for PROFINET IO represents each connected PROFIBUS DP
slave as a PROFINET IO device on PROFINET.
In PROFINET CBA, the proxy for PROFINET CBA represents each connected PROFIBUS
DP slave as a component on PROFINET.
As a result, there are, for example, different IE/PB Links for PROFINET IO and PROFINET
CBA. Currently, you can only use a CPU 317-2 DP/PN as a proxy for PROFINET CBA.
Integrating Components and Devices
In Component based Automation, you integrate the components in an interconnection editor
(for example SIMATIC iMap). The components are described in a PCD file.
In PROFINET IO, you integrate the devices in an engineering system (for example STEP 7).
The components are described in a GSD file.
Connecting PROFIBUS Devices via an IE/PB Link
Remember that there is a separate proxy functionality for PROFINET I/O and PROFINET
CBA. With the IE/PB Link, this means that you must use different devices depending on the
system you are using.
Interaction of PROFINET CBA and PROFINET IO
PROFINET IO integrates field devices (IO devices) in PROFINET. The input and output data
of the IO devices is processed in the user program. The IO devices with their IO controller
themselves can, in turn, be part of a component in a distributed automation structure.
You configure communication between, for example, a CPU as IO controller and the IO
devices assigned to it as PROFINET IO in much the same way as a PROFIBUS DP master
system in STEP 7. You also create your user program in STEP 7. From this, you generate a
component in STEP 7.
You then configure communication between the components conveniently in SIMATIC iMAP.
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
(for example CP 1612). With the CP 1616, the user program executes on the CP, with
SOFTNET PROFINET, it executes in the CPU of the PC.
Configuring
4.11 Planning subnets
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