.BondLib.Interfaces.fBondCon .BondLib.Interfaces.fBondConThe bondgraphic connectors reference three variables, two of which are physical variables, whereas the third one is a topological variable. All three are defined as potential variables.
Potential variables: e: Bondgraphic effort variable (output) f: Bondgraphic flow variable (input) d: Directional variable indicating the direction of positive power flow (output)