Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 52)

Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical data
3-24
Manual, Edition 08/2004, A5E00105475-05
Detailed Information
For detailed descriptions of the individual system status lists, refer to the manual System
Software for S7-300/400 System and Standard Functions.
3.2.10.4 Open communication via Industrial Ethernet
Requirements
• CPU 31x-2 PN/DP with firmware version 2.2.0 or higher:
• STEP 7 V5.3 + Servicepack 1 or higher
Functionality
CPUs with Firmware V2.3.0 or higher and integrated PROFINET interface support the open
communication functionality via Industrial Ethernet (in short: open IE communication)
Open IE communication is always handled directly via TCP/IP.
How to use open IE communication
To be able to exchange data with other TCP/IP-compatible communication partners by
means of the user program, STEP 7 provides four FBs and one UDT for the configuration of
your connection:
•
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" contains the data structure for the configuration of your
connection.
Data block for the configuration of the connection
TCP/IP communication is connection-oriented. Data can only be transferred when a
connection to the communication partner is established. The CPU supports multiple parallel
connections to a communication partner.
To configure your connection, you need to create a DB that contains the data structure of
UDT 65 "TCON_PAR." This data structure contains all parameters you need to establish the
connection. You need to create such a data structure for each connection, and you can also
organize it in a global DB (for example, ARRAY[1..8] "T_ADDR_INFO".)
Connection parameter CONNECT of FB 65 "TCON" reports the address of the
corresponding connection description to the user program (for example, P#DBa.DBXb.c
byte 64).