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It is not recommended to connect the two common points because they are separate supplies and the ratings of the two inputs are different.
Connecting the two Commons essentially connects two power supplies together. This is not necessarily a problem until other connections (S1 & D1, etc) are made, in which case there could be over voltage situations depending on what is connected to S1 and D1.
e.g. You decide to externally excite the Digital inputs: