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I was looking at the NI site and they have a profinet interface.  To pass data to and from S7 I’m sure some programming has to be done 

You should be able to find something close here   you just need the starter set up section   https://www.automation.siemens.com/mc-app/sinamics-application-examples/Home/Index?language=en

Yes and yes https://support.industry.siemens.com/cs/search?search=1500%20opc&type=ProductSupport%2CExampleOfUse%2CCatalog%2CCertificate%2CCharacteristic%2CDownload%2CFaq%2CManual%2CProductNote%2CDownloadSoftwareArchive%2CSlk%2CForum&lc=en-GB   please describe in detail what you are doing?

You made the right decision  S71500 can be a client or server.  typically your plc is a sever (Serves data) and the pc is the client  S71200 can be a server.    Both are easy to set up

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Pressure, humidity... these are typically “analog” inputs to a plc. The analog value from the sensor is typically 0-10 vdc , 4-20 milliamp. Others exist, these are the common outputs from these sensors  your plc system will need an “analog input” for each sensor  and yes, 24vdc is needed to power the plc and these sensors    

It doesn’t need it on the motor.  Setup the mechanics appropriately. The plc closes the position loop.  But the motor must drive the material and the encoder must be driven from the material. They have to be connected in some fashion.  Do some reading. It will work.  Or hire a system integrator. 

So analog to your drive and high speed counter from an encoder back to the 1200 hsc input Easy This is done with a TO A third party drive will work just fine Enable from plc - a Qx,x output Analog reference from plc  for position/speed control  

Yes. You can do point to point moves with a TO in the 1200. That’s the way I would control it.  I can’t say I understand your ramping scheme but a 1200 can be a position controller 

The S71200 has technology objects for position control. Have you looked in to that ?

 Contact your Siemens distributor  you have to buy it 

In a tvstevie previous post... he already has a pdf of the s7200 program.    http://forums.mrplc.com/index.php?/topic/38080-old-siemens-plc/   He’s converting to automation direct.  He doesn’t need Microwin.  Start writing code. 

No. It’s not backward compatible 

And you would be complaining if you didn’t  get a quote.    go buy TIA Portal Step7 Basic This is the replacement        

Go online and look in the diagnostic buffer what cpu?