Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual page 53

PROFINET (Industrial Ethernet)
Availability: CPUs with a "PN" name suffix are equipped a second interface, namely the
PROFINET interface (CPU 317-2 PN/DP, for example) A PROFINET interface, or
communication processors, can be used to implement Industrial Ethernet in an S7-300 CPU
system.
Industrial Ethernet, in an open multivendor communication system, represents the SIMATIC
network at the process and cell level. PROFINET CPUs, however, also support real-time
communication at the field level. This structure also supports S7 communication. Industrial
Ethernet is suitable for high-speed and high-volume data exchange, and for remote network
operations via gateway.
PROFINET is available in two versions:
• PROFINET IO and
• PROFINET CBA.
PROFINET IO is a communications concept for the implementation of modular distributed
applications. PROFINET IO allows you to create automation solutions you are familiar with
from PROFIBUS.
PROFINET CBA Component-Based automation) is an automation concept for the
implementation of applications with distributed intelligence. PROFINET CBA lets you create
distributed automation solutions, based on default components and partial solutions. This
concept satisfies demands for a higher degree of modularity in the field of mechanical and
systems engineering by extensive distribution of intelligent processes.
Component-Based automation is designed for the integration of complete technological
modules as standardized components into large systems.
PtP communication (PtP)
Availability: CPUs with "PtP" name suffix are equipped with a second interface, namely the
PtP interface (CPU 314C-2 PtP, for example)
PtP does not represent a subnet in the common sense, because it is used to interconnect
only two stations.
If a PtP interface is not available, you require PtP Communication Processors (CP).
Actuator/Sensor Interface (ASI)
Implementation by means of communication processors (CP).
The ASI, or actuator/sensor interface, represents a subnet system on the lowest process
level for automation systems. It is designed especially for networking digital sensors and
actuators. The maximum data volume is 4 bits per slave station.
S7-300 CPUs require communication processor for the ASI connection.
Reference
For further information on communication, refer to the
manual.
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
4.11 Planning subnets
Communication with SIMATIC
Configuring
4-29