Instructions
You can use the open communication through ISO-on-TCP connections for data exchange by way of the Industrial Ethernet CPs of S7-300 and S7-400.

Below we describe how to configure an ISO-on-TCP connection for sending and receiving data by way of an Industrial Ethernet CP of S7-300 and S7-400.

ISOonTCP_Connection_en.pdf ( 2121 KB )

The functions below are called in the user program of the CPU for sending and receiving data by way of configured ISO-on-TCP connections.

• FC5 "AG_SEND" and FC6 "AG_RECV" for the S7-300
• FC50 "AG_LSEND" and FC60 "AG_LRECV" for the S7-400

The entries below contain sample programs and instructions for programming the above-mentioned functions in the user programs of S7-300 and S7-400: 17853532 and 18513371.

Note
More information on communication over the Industrial Ethernet with S7-300 and S7-400 is available in the entries below.
 

Entry ID	Description
26484227	What properties, advantages and special features does the ISO-on-TCP protocol offer?
22385024	How do you configure a TCP connection for data exchange between S7-300 and/or S7-400 by way of Industrial Ethernet CPs?
47885893	How do you configure a UDP connection for data exchange between S7-300 and/or S7-400 by way of Industrial Ethernet CPs?
47885244	How do you configure an ISO transport connection for data exchange between S7-300 and/or S7-400 by way of Industrial Ethernet CPs?
29737976	How do you program the communication blocks FB63 "TSEND", FB64 "TRECV", FB65 "TCON" and FB66 "TDISCON" in order to use the ISO-on-TCP protocol for data exchange by way of the integrated PROFINET interface of a CPU or by way of the CP443-1 Advanced?
30564821	Functions (FC) and Function Blocks (FB) for SIMATIC NET S7 CPs Programming Manual