Siemens S7-300 - 3.3 Firmware update via HW Config

Communication via Ethernet CPs in S7 stations
1.6 Open communications services (SEND/RECEIVE interface)
Configuring and commissioning S7 CPs for Industrial Ethernet
28 Configuration Manual, 09/2013, C79000-G8976-C182-13
S7 communication via routers (oneended client and server functionality)
It is possible to reach the S7 station from an application (OPC server) of the PC/PG station
that is attached to another subnet. The two subnets must be connected via a router such as
the IE/PB Link. An S7 station or a PC connected to both subnets can also serve as a router.
In this configuration, the S7 station can only be addressed by the PC/PG station as a
communications server on S7 connections configured at one end.
The requirements for the configuration of the PC/PG station are identical to those for
operation in the same subnet (see above); the CP in the PC/PG station must also have
routing capability.
In this situation, configure a
one-ended
S7 connection to the S7 stations in the other subnet
for the PC/PG station in STEP 7. You can then read and write data in the S7 station in your
user program using the services for S7 communication.
Access from a PC/PG to PROFINET via a CP with 2 interfaces acting as a router
In an S7 station, you can use a CP with two interfaces as a router. When you connect the
PC/PG to the gigabit interface of the CP, you have access to the subnet in the PROFINET
interface of the CP. Enter the CP as a router on the PC/PG.
1.6
Open communications services (SEND/RECEIVE interface)
Application
Using the SEND/RECEIVE interface, your S7 user program has access to the open
communications services with configured connections.
Note
Due to compatibility with the S5S5 connections in SIMATIC S5, the previous name of the
open communications services was "S5
-compatible communication".
Data transmission over a configured connection is suitable for the following types of data
transfer:
● the reliable transfer of related blocks of data between two Ethernet nodes using
– ISO transport connection (not for PROFINET CBA standard components).
– TCP or ISOonTCP connection;
● Datagram service / User Datagram Protocol
Simple unacknowledged transfer of related blocks of data between two Ethernet nodes
with UDP on IP.
The SEND/RECEIVE interface is also used for sending email.