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Hello!

I would like to connect Simulink Object (described by transfer function) with PID controller in Simatic S7-300...

I find special software for this type of connection between Simulink and Simatic -MATLAB/SIMULINK-DDE-Client (Siemens), but it's very expensive. Does someone know about demo version of this kind of software?

I will be grateful for any information.

Hello,

Try to check free libraries related to this link - http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?object Id=3376&objectType=file.

I've connected GeFanuc VersaMax Micro with an dynamic object in Simulink and it worked properly.
Of course you need apart from this library I/O server (client/server DDE or OPC server), which will be both a sender and a receiver of data from and to PLC. It is possible to use a free OPC server from KepWare company Web site (http://www.kepware.com/Products/products_OPCServers.html).

Good luck.