Hey All !

I have two CPU of S7 300 series ( 314C-2 PN/DP), and i have to establish Modbus TCP IP
Communication in between them. 
I request you all two provide me any document regarding that. 

NOTE: I am not using any kind of CP for communication, Using inbuilt port for this communication.

Requesting all members to let me have on asap as needed urgently.

Thanks & Regards 

Thanks for your reply sir , I got your concern but the network topology and type of connection required by client is TCP IP method, so unable to proceed with S7 Communication !

Hi,

or also I-Device or I-Slave can be taken in to consideration.

If TCP/IP is necessary, why not simply use open user communication with the T blocks like TCON/TSEND/TRCV?

Modbus TCP/IP would not be the preferable communiction method in my opinion, also because with classic CPUs a additional license is necessary to use Modbus TCP/IP (also via internal interfaces).

regards

sancruz

 Hi again,

SS69283

 type of connection required by client is TCP IP method,

TCP/IP, or Modbus TCP specifically? Because as mentioned above, this are differnet stories.

You can build a TCP communication also via TCON/TSEND/TRCV, information can be found here:

Which types of connection/protocols do the S7-300/400 CPUs and the CPs support by default?

How do you program the communication blocks FB63 "TSEND", FB64 "TRCV", FB65 "TCON" and FB66 "TDISCON" in order to use the TCP protocol for data exchange by means of the integrated PROFINET interface of an S7-300/S7-400 CPU?

regards

sancruz

Hey All 

After having study about this, it need some license to communicate through TCP IP. 

Thanks all for your suggesstions.

国外的朋友您好，请问这个问题解决了吗

Hello AutoGen_9158591,

Please try to discuss your question in English language. This is an international community and we try to focus on one language. Posting in English will help to generate more replies to your question.

This is the translation of your question:

AutoGen_9158591

Hello international friends,
has this problem been solved?

Kind regards, Moderator_Lan