[Albert]

This is a palletizing robot (4 axis robot) and RoboDK is unable to show the sphere you usually see with 6-axis robot arms.

On the other hand, you could use the Reachability app to check the reachability at certain points:

1. SelectTools-Plug Ins
   
2. Make sure theAppLoader启用插件(双click on it)
   
3. SelectTools-Apps List
   
4. Double click on theReachabilityapp (or make sure it is enabled)
   
5. You'll see theReachabilitymenu and you can selectReachability-Check reachability
   

You should then see how reachable the current position is with the active tool. Make sure you have a tool active.