Link entities are composed of Chained System Tracked System, Ball Placing, CPlacing Connector, Ball Placing Contact, Soil Interaction Contact, massless Track Link, Ball Screw, Water ,Thrust Force and Hydro Force.
Figure 12.1: List of Link entities
| Entity | Description |
| Chained System |
This supports below items 1. Operation method of wrapping segment on path. 2. Creation method for multi contact and multi connection. |
| Tracked System |
This supports below items. 1. Operation method of wrapping segment on path. 2. Automatic creation method for multi contact and multi connection. |
| Cplacing Connector |
This supports below items 1. Perform structural analysis of segment, pin and pulley. 2. Creation of segment connection and pin/pulley contact. |