Hello,

I've an application in which two axis needs to be in linked gearin mode but the leading axis also need to have a limit on its torque.

The problem is that when the master axis reaches the torque limit slows down but the slave axis keeps moving as nothing happens.

I want the slave axis to precisely follow the master axis speed. How can I overcome this problem?

At the moment I'm working on a test machine with a S7-1513 CPU and two V90 axes but the final machine will have S7-1507 software controller and the axes will S120.

Thank you for your help.

I agree but, apparently, seems it can be done only done with S7-1500T CPUs. It can't be done with non-T CPUs or with the software controller CPUs.

Is there a different way to overcome the problem? Maybe with some functionality o the S120 axes?

Thank you.

Being in your shoes I'd try some tricking a TO_ExternalEncoder with an artificial telegram assembled from a leading axis actual position value in a pre interpolator OB. And then use that encoder as a leading axis. Presuming that your controller supports this OB.

There's also possibility to do something in drives. But I think the DCB extension isn't free.

But personally I'd go for a technology version of the controller.