I have made similar projects with less performance drive, with simple vfd driver, but the clamping device consisted in conical insert that snaped the rotating table in exact position. You have many possibilities that you should try before give up, of course for 9400 with profibus is an easy task.

So you will need to make a position loop in PLC and velocity in servo, you need to have an encoder connected to PLC or use encoder emulation port on servo drive, but again you will face the problem tha has differential quadrature output that can be converted with rs422 receiver like uA9637AC or you can also try to connect directly only two signals A and B to 5V signal board of S7-1200.

For output you can choose analog signal with self made motion or PTO (with added rs422 transmitter) with use of MC_MoveVelocity. You could execute in interrupt a read of HSC, a P-regulator and update MC_Velocity. 

Hello,

the positionning is linear in my case.
there'll be much work to do and i really got pressure coz of time.
also am fearing that maybe i can't guarantee the same precision. in PLC regulation world we have to adjust correctly & know all the parameters. and i wanna just make a right performant solution, that it'll not fail. coz of time and coz what they expect from me.

they told me that 9400 servodriver is new in market. so, it's not sure that it'll solve my problem.

every time i think i finally could stand, i face another problem that just let me fall again.

you know when you do a work and it success. the whole life can't give you a price for it.
else you will just hate your self as useless person


Best regards