Updated is_at_target to accept calculated value from readback and not just an epics pv flag.

attocube.py

@@ -198,9 +198,15 @@ class AttocubeAxis(Adjustable):
     def is_moving(self):
         return self.pvs.moving_status.value == 1
 
-    def is_at_target(self):
-        return self.pvs.target_reached.value == 1
-    
+    def is_at_target(self,from_pv=False,tolerance = 0.3):
+        """Check whether target was reached. 
+        If from_pv is True TARGET_REACHED_RB is used, else it's calculated as diffrence between the readback and set value within tolerance.
+        Default is False, because otherwise tolerance can only be set and read out as an integer."""
+        if from_pv == True:
+            return self.pvs.target_reached.value == 1
+        else:
+            return abs( self.pvs.readback.get() - self.pvs.drive.get() ) < tolerance
+                
     def allow_move(self):
         self.pvs.move.put(1, wait=True)