Profibus communication between DELTA PLC and Siemens

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Hello guys,

I have an application with a Delta PLC (slave), Load cell module and Delta HMI. 

The problem is that the Delta PLC has to report to the already existing platform of Siemens S7 PLC (Master) with Profibus. The Master (Siemens) writes and reads data from the Delta PLC.

The question is, how can I set up the Profibus communication? Are there any documentations about the Memory Mapping, configuration etc. There are some modules for Profibus Slave from Delta but I cannot find any references or anything.

Thanks in advance.