PID simulation


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How can I simulate simatic PID algorithm in Matlab to get the best settings for this problem:

I did in Matlab model of Heat process. It's one object described by Transfer function and PID.
In Siemens help PID controller is K(1+1/Tis+Tds) so I used this form to simulate PID. With Matlab I can find good K, Ti, Td for this process.

When I obtain good Kp, Ti, Td, I write them to PID Db block. In next step I connect via OPC my model in Matlab (only object) with PID algorithm in PLC. But this controller does not work good.

What should I do to simulate better behavior of Cont_C in Matlab?

Sorry for my english...
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