Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical Data
3-24 Manual, 01/2006 Edition, A5E00105475-06
3.2.10.4 Open communication via Industrial Ethernet
Requirements
• STEP 7 V5.3 + Servicepack 1 or higher
Functionality
The CPUs with integrated PROFINET interface as of firmware V2.3.0 or V2.4.0 support the
functionality of open communication by means of Industrial Ethernet (abbreviated:
open
IE communication
)
Following services are available for open IE communication:
• Connection oriented protocols
– TCP native according to RFC 793, connection type B#16#01, as of firmware V2.3.0
– TCP native according to RFC 793, connection type B#16#11, as of firmware V2.4.0
– ISO on TCP according to RFC 1006, as of firmware V2.4.0
• Connectionless protocols
– UDP according to RFC 768, as of firmware V2.4.0
Features of the communication protocols
The following distinctions are made between protocol types in data communication:
• Connection oriented protocols:
Prior to data transmission these establish a (logical) connection to the communication
partner and close this again, if necessary, after transmission is completed. Connection
oriented protocols are used when security in especially important in data transmission. A
physical cable can generally accommodate several logical connections.
For the FBs to open communication by means of Industrial Ethernet, the following
connection oriented protocols are supported:
– TCP native according to RFC 793 (connection types B#16#01 and B#16#11)
– ISO on TCP according to RFC 1006 (connection type B#16#12)
• Connectionless protocols:
These operate without a connection. There is also no establishing or terminating a
connection to remote partner. Connectionless protocols transfer the data without
acknowlegement and thus unsecured to the remote partner.
The following connectionless protocol is supported at the FBs for open communication
via Industrial Ethernet:
– UDP according to RFC 768 (connection type B#16#13)
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