Is it possible to have smart client server combine with aspect server in 800xA 5.1 system
The first and simple answer would be no. Your drawing shows that the Aspect Servers are also the Domain Servers. I am sure that this combination has never been tested as also containing the Smart Client Server, therefore support would be of question.
The next question would be that you list your Historian in your text as an 800xA History, however, on the drawing, it shows as an IM, (Information Manager). This point will have to be clarified. Since an IM contains PPA software, and an 800xA History Server does not, this needs to be known. An IM node can in combination be a Smart Client Server/Data Provider node. I have never seen where an 800xA History is also a Smart Client Server, although I assume it is possible.
It is always best to make the Smart Client Server an independent node, outside the 800xA CS network, preferably outside a Firewall for security reasons. Remember that Smart Client clients will typically reside outside the 800xA CS network, and thus should be isolated.
For additional questions, it would be suggested to submit a Support Case to your local RAC so that further analysis can be done.