PROFIBUS SIMULATOR SOFTWARE

[Novice]

Hello the Experts,
I would like know if exist a software for Profibus simulator.
I want to simulate a variable with the simulator with the Laptop through RS232 or RS485 and I see the value in a device.
Can you tell me if it's possible to have the simulator Profibus.
Thanks you in advance

[Info]

Connecting DP slaves directly to an OPC server (SIMATIC Net PC configuration)
http://support.automation.siemens.com/W ... n/15127600
or
Sowtware PLC WinAC