The LoadTypeis for describing loads mounted on the motion device typically by an integrator or a customer and is formally defined in Table 47. Instances of this ObjectTypedefinition are used to describe the load mounted on one of several mounting points. A very common mounting point is the flange of a motion device. Typically a motion device has additional mounting points on some of the axis. The provided values can either be determined by the robot controller or can be set up by an operator.
Figure 23– Overview LoadType
Attribute 
Value 

BrowseName 
LoadType 

IsAbstract 
False 

References 
Node Class 
BrowseName 
DataType 
TypeDefinition 
Modelling Rule 
Subtype of the BaseObjectType defined in OPC Unified Architecture 

HasComponent 
Variable 
Mass 
Double 
AnalogUnitType 
Mandatory 
HasComponent 
Variable 
CenterOfMass 
3DFrame 
3DFrameType 
Optional 
HasComponent 
Variable 
Inertia 
3DVector 
3DVectorType 
Optional 
The variable Massprovides the weight of the load mounted on one mounting point.
The EngineeringUnitsof the Massshall be provided.
The variable CenterOfMassprovides the position and orientation of the center of the mass related to the mounting point using a 3DFrameType. X, Y, Z define the position of the center of gravity relative to the mounting point coordinate system. A, B, C define the orientation of the principal axes of inertia relative to the mounting point coordinate system. Orientation A, B, C can be "0" for systems which do not need these values.
3DFrameTypeand 3DFrame are defined in OPC 1000111 (SpatialTypes).
If the instance of the LoadTypedescribes the flange load of a motion device the mounting point coordinate system is the flange coordinate system. If the instance of the LoadTypedescribes an additional load of an axis the mounting point coordinate system is vendor specific and it is up to the vendor to model this coordinate system.
The variable Inertiauses the 3DVektorTypeto describe the three values of the principal moments of inertia with respect to the mounting point coordinate system. If inertia values are provided for rotary axis the CenterOfMassshall be completely filled as well. Table 48describes the possible degrees of modelling from a minimal one e.g. only the weight of the mass to a complete one comprising weight, center of mass, principal axes and inertia.
3DVectorTypeand 3DVector are defined in OPC 1000111 (SpatialTypes).
Table 48– LoadType possible degrees of modelling

Mass 
CenterOfMass 
Inertia 

X, Y, Z 
A, B, C 


Mass only 
Used 
 
 
 
Mass with center of gravity 
Used 
Used 
0, 0, 0 
 
Mass with inertia 
Used 
Used 
Used 
Used 