Siemens S7-300 Configuration Manual page 18

Communication via Ethernet CPs in S7 stations
1.3 SIMATIC S7 communication options with Ethernet CPs
● FETCH/WRITE services (server)
The FETCH/WRITE services (server) allow direct access to the system memory areas on
the SIMATIC S7 CPU from SIMATIC S5, SIMATIC PC stations, or from third-party
devices.
Depending on the CP type, the following communications services are available for
FETCH/WRITE access:
– ISO transport
– TCP/IP for internetwork communication with ISOonTCP connections (RFC 1006), TCP
● PROFINET IO
PROFINET is a standard of the PROFIBUS Users organization defining a vendor-
independent communications and engineering model.
– PROFINET IO controller
– PROFINET IO device
For PROFINET IO communication, UDP is used to assign parameters and RT (real time)
or IRT (isochronous real time) for cyclic IO data traffic.
● PROFINET CBA
– PROFINET CBA
● HTML process control / Web diagnostics
Supplied functions and HTML pages allow you to query important system data using a
Web browser.
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Optimized for top performance at the selfcontained manufacturing level.
connections.
The S7CPs that support the PROFINET IO controller mode allow direct access to IO
devices over Industrial Ethernet.
With the S7CPs that support the PROFINET IO device mode, you can operate S7
stations as "intelligent" PROFINET IO devices on Industrial Ethernet.
Additional information: see References for PROFINET IO (Page 233).
An S7 station equipped with a CP capable of PROFINET CBA can be interconnected
as a PROFINET CBA component in SIMATIC iMap.
Additional information: see References for PROFINET CBA (Page 230)
In PROFINET CBA, interconnections are used with acyclic and cyclic transmission.
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13