Ping: Permitted Length Of Icmp Packets - Siemens SIMATIC NET CP 442-1 RNA Equipment Manual

Industrial ethernet

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Table Of Contents

Table of Contents

Use

To allow the user program to exchange data with other TCP/IPcompliant communications

partners, STEP 7 provides a UDT for the connection parameter assignment and four program

blocks:

• UDT 65 "TCON_PAR" with the data structure for connection parameter assignment

• FB65 "TCON" for connection establishment

• FB66 "TDISCON" for connection termination

• FB63 "TSEND" for sending data

• FB64 "TRCV" for receiving data

TCP/IP communication is connectionoriented. Data can be transmitted only when a

connection has been established to the communications partner. The CPU can use several

connections to a communications partner at the same time.

The following protocol variants are supported:

• ISO on TCP according to RFC 1006

Programming

Make the following parameter settings in the connection description (UDT 65):

• local_tsap_id: Byte 1 = 0xE0 (value mandatory for correct functionality)

• local_tsap_id: Byte 2 = rack/slot number

• remote_tsap_id: Byte 1 = 0xE0 (value mandatory for correct functionality)

• remote_tsap_id: Byte 2 = rack/slot number

Note: The TSAPs can be 2-16 bytes long. The first two bytes must be occupied as described,

you can use the other bytes to suit your task.

Note

Note that the number of dynamically established connections also depends on the number of

configured, statically established connections.

You will receive corresponding condition codes on the call interface of the FBs.

Refer to the documentation of the program blocks in the online help and in the

documentation for STEP 7. There, you will also find examples of parameter assignment!

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