Closed loop control with drive AC with only digital direction command

Good morning,i'm trying to use a motion control function with S7-1200 CPU1212.

The AC drive that i'm using accept only a reference speed from 0 to 10 V.

The direction of movement is gived by two digital commands.

The problem that i've found is that Motion Control of S7-1200 can control the axes by bidirectional analog signal (+- 10V) and only with a single digital command (enable axe).

There is maybe any special function to solve this situation ?

qwazee

What you want to do is possible.
Please evaluate this FAQ:
https://support.industry.siemens.com/cs/ww/en/view/109741575

 Thank qwazee, but in my opinion this example doesn't suite my case.

walter_g

qwazee

What you want to do is possible.
Please evaluate this FAQ:
https://support.industry.siemens.com/cs/ww/en/view/109741575

 Thank qwazee, but in my opinion this example doesn't suite my case.

Hello.

It is exactly the tools you need.
Understand the underlying concepts that are described. 

Someone with the exact problem as yours came to a solution:
https://support.industry.siemens.com/tf//ww/en/posts/185616/

Problem solved.

The solution is very simple.

I've used only the OB95 MC-PostServo.

The analog output of the Axes is loaded on a DB, so the bipolar value is elaborated into the OB95.

With the instruction IN_RANGE select when the value is over 0 or under 0.

When the value is over 0 i've activated the digital output for forward, the opposite for backward digital output.

thanks