PROFINET
6.6 Open Communication Via Industrial Ethernet
S7-400 Automation System, CPU Specifications
6-10 Manual, 10/2006, 6ES7498-8AA04-8BA0
6.6 Open Communication Via Industrial Ethernet
Requirement
● STEP 7 V5.4 + Servicepack 1 or higher
Functionality
CPUs with Firmware V5.0 or higher and integrated PROFINET interface support the open
communication functionality via Industrial Ethernet (in short:
open IE communication
)
Following services are available for open IE communication:
● Connection oriented protocols:
Prior to data transmission connection oriented protocols 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. The maximum message frame length is 32 KB.
The following connection oriented protocols are supported for the FBs for open
IE communication:
– TCP according to RFC 793
– ISO on TCP according to RFC 1006
● Connectionless protocols:
Connectionless protocols operate without a logical connection. There is also no
establishing or terminating a connection to remote partner. Connectionless protocols
transfer the data unacknowledged and thus unsecured to the remote partner. The
maximum message frame length is 1472 bytes.
The following connectionless protocols are supported for the FBs for open
communication by means of Industrial Ethernet:
– UDP according to RFC 768
How to use open IE communication
To allow data to be exchanged with other communication partners, STEP 7 provides the
following FBs and UDTs under "Communication Blocks" in the "Standard Library":
● Connection oriented protocols: TCP/ISO-on-TCP
– FB 63 "TSEND" for sending data
– FB 64 "TRCV" for receiving data
– FB 65 "TCON", for connecting
– FB 66 "TDISCON", for disconnecting
– UDT 65 "TCON_PAR" with the data structure for the configuration of the connection
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