Hello everyone,

I am currently working on virtual commissioning with the combination of PLCSIM Advanced, SIMIT and NX / MCD (SiL).

There is a behavior that I can’t understand.

As usual, I have integrated my drive in the TIA Portal and assigned it to a technology object (positioning axis).

Then I created a PLCSIM Advanced and MCD coupling in SIMIT and interpreted the ProfiDrive telegram in a chart.

I added the CAD model with the necessary kinematic properties.

If I control the axis of my control panel in the TIA Portal (eg. 100mm / s), the axis moves slower in the MCD, although the observation value of the speed controller appears 100 mm / s.

If the axis is controlled directly in the MCD (speed controller 100 mm / s), the axis moves about twice as fast as with SIMIT-coupling.

Can someone understand this behavior ?

It seems you have an issue regarding the configuration of your SIMIT project. 

To check what's wrong with your project, I recommend taking the following steps:

1. Check if the Bus-synchronous mode is active. In order to transfer speed values to MCD, you need to implement the MCD file via the native NXOpen Coupling (displayed as MCD coupling in SIMIT).
   
   If this is not the case, you cannot transfer speed values because the data will not be synchronized.
   
   
2. Check if the Time Slice in your SIMIT project has been configured correctly. You will need to set the send-clock of your Sync-Domain to one time slice. I recommend doing so for Time Slice 2, because this will be the default one. You can find this value either in the TIA Project (in the Sync Domain Properties) or in the imported project inside the PLCSIM Advanced coupling. See the attached screenshots for further information. 
   
   I think you entered a wrong value here, because you are getting double / half the speed in MCD of what you are expecting. So please correct that.
   
   
   
3. Maybe there is a misconfiguration in your diagram / in some calculations happening before the speed is transferred. This can include e.g. Reference or Max Speed in the ProfiDrive2 block. 
   These values has to be the same as configured in the Technology Object in TIA Portal.

I hope these steps will help you.