What is the difference between X20DC2396-01 and 02 on profibus?

We try to add X20DC2396 module on X20BC0063 when we configure the module on Seimens side we find there are 2 modules what is the difference?

Hello,
basically different “operating modes”
Please have a look at the manual
PROFIBUS Bus Controller User’s manual | B&R Industrial Automation

The “C02” offers acyclic transfer of additional registers

Thanks, so does it mean that the module hardware itself is the same, but I can choose different modes in the Siemens software, that is, I can choose either C01 or C02?

Correct. The hardware is the same but different or more data is transfered. In your case acyclic data

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