Profibus or MPI?

[e5frog 0]

I have a CPU313 (Simatic S7-300), don't know if it's Profibus or MPI, connector only says X1. 

How do I check? 

[panic mode 246]

read the datasheet, for example  Manual, A5E00105475-12

CPUs that support Probus will also show that by DP in model name. higher versions of CPU may allow choice of either MPI or DP on a same port. Lower models usually only support one.