10 Further Notes on Operation
B4A−68
CP 443-1 Advanced for Industrial Ethernet / Manual Part B4A
Release 01/2007
C79000-G8976-C193-06
IP Access Protection with Programmed Communication Connections
In principle, it is possible to set up communication connections using FB55 by
programming and at the same time by configuring IP access protection. Please
note the following point:
Notice
In contrast to programmed communication connections, on configured
communication connections, the IP addresses of the partners are not
automatically included in the IP−ACL (IP Access Control List)!
10.5.4 Open TCP/IP communication (as of firmware version V2.2)
Use
To allow the user program to exchange data with other TCP/IP−compliant
communication partners, STEP 7 provides a UDT for the connection parameter
assignment and four FBs.
S UDT 65 ”TCON_PAR” with the data structure for connection parameter
assignment
S FB65 ”TCON” for connection establishment
S FB66 ”TDISCON” for connection termination
S FB63 ”TSEND” for sending data
S FB64 ”TRCV” for receiving data
TCP/IP communication is connection−oriented. Data can be transmitted only when
a connection has been established to the communication partner. The CPU can
use several connections to a communications partner at the same time.
The following protocol variants are supported:
S ISO on TCP according to RFC 1006
Uses / Advantages
Higher data throughput than with the configured connections of the
SEND/RECEIVE interface.
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