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Deployment Ethernet communication - productive
Basics - Protocols
8.4 Basics - Protocols
Overview
Siemens S7 connections
104
Protocols define a set of instructions or standards that enable computer to establish com-
munication connections and exchange information as error free as possible. A commonly
established protocol for the standardization of the complete computer communication is
the so called ISO/OSI layer model, a model based upon seven layers with rules for the
usage of hardware and software
page 101
The following protocols are used:
n
Siemens S7 connections
n
Open communication
–
TCP native according to RFC 793
–
ISO on TCP according to RFC 1006
–
UDP according to RFC 768
With the Siemens S7 connection large data sets may be transferred between PLC sys-
tems based on Siemens STEP
dition for the Siemens S7 communication is a configured connection table, which contains
the defined connections for communication. Here NetPro from Siemens may be used.
Properties:
n
A communication connection is specified by a connection ID for each connection
partner.
n
The acknowledgement of the data transfer is established from the partner station at
level 7 of the ISO/OSI reference model.
At the PLC side FB/SFB Yaskawa handling blocks are necessary for data transfer for
n
the Siemens S7 connections.
More information about the usage of these blocks may be found in the
manual "SPEED7 Operation List" from Yaskawa.
Ä Chap. 8.2 'Basics - ISO/OSI reference model'
®
7. Here the stations are connected via Ethernet. Precon-
HB140 | CPU | 315-4PN23 | en | 18-02
+
System 300S
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